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HP 4260A User's Manual

1. Model 42604 02337 2 Section VII Paragraphs 7 1 to 7 4 SECTION VII MANUAL CHANGES AND OPTIONS 7 1 MANUAL CHANGES 7 2 This manual applies directly to standard Model 42604 Universal Bridges with serial prefix 601 or 602 Table 7 1 lists instrument serial numbers and the changes required to make this manual apply to these older instruments 7 3 OPTIONS 1 4 There are currently no options offered for the Madel 4260A Universal Bridges Table 7 1 Manual Changes for Older Instruments Complete 601 602 00740 and below CHANGE 1 Page 6 3 Table 6 1 and Table 6 2 Delete 1205 0033 HEAT DISSIPATOR FOR Q201 601 602 00741 thru 00840 601 602 00841 thru 01040 CHANGE 2 Page 6 10 Table 6 1 and Table 6 2 Part number for R5 pulley was 04260 3021 but 04260 5099 ls the preferred replacement CHANGE 3 For older instrumenta with serial number 601 602 01040 and below the values listed in thia manual are the preferred replacements the following parta Page 6 3 R103 R110 Rill A200 C207 Page 6 4 R210 R213 Page 6 8 R442 R452 7 1 1 2 Model 4260A 02337 1 Section Paragraphs 8 1to 8 3 SECTION VIII CIRCUIT DIAGRAMS 8 1 INTRODUCTION 8 2 This section includes the following General Notes for Schematic Diagrams Figure 8 1 b Block Diagram Figure 8 2
2. serve decimal point location and units displayed bwindow below meter Note For maximum resolution final CRL coun ter display should be greater than 0100 3 13 MILLIOHMS AND MEGOHMS MEASUREMENTS For measurements between 10 milliohms and 100 ohms t gr between 10 kilohms and 10 megohms a sensitive de null voltmeter such as the HP 413A should be used Referto Paragraph3 15 for voltage and current meas grements for the unknown R Connect the null volt meter and make resistance measurements as follows a Remove the shorting strap onthe voltmeter rear panel ground terminals to avoid ground loops b Perform theturn on procedure outlined in Para graph 3 3 c Connect the voltmeter input ground orlow term jnal to the rear paneldetector ground terminal onthe Universal Bridge Connect UNKNOWN LOW terminal to the other Voltmeter input terminal d Set FUNCTION switch to R e Connect the resistor to be measured to the UN KNOWN terminals Set RANGE switch for meter indication near the center and increase meter sensitivity by rotating SENSITIVITY control clockwise If meter indication ds right of center turn CRL control E left turn CRL control ew Adjust CRL control for meter cen ter indication while increasing SENSITIVITY control to maximum sensitivity full cw g Read measured resistance value on CRL coun ter Observe decimal point location and units dis
3. h Q Wee ee I d 8 11 Section VI Table 8 2 dg Stock No 0685 2715 0665 2735 0683 2745 0683 3015 0683 3025 0683 3045 0683 3315 0683 3625 0683 3645 0685 4715 0683 5135 0683 5625 0685 5655 0685 6215 0683 6815 0683 6825 0683 6835 0683 7515 0683 8215 0683 8225 0683 8245 0688 1031 0684 1041 0684 1231 0584 1521 0688 1531 0688 2231 0684 2721 0684 2781 0688 4721 0688 4731 0684 5621 0684 6821 0684 6831 0684 8221 0687 1541 0690 1821 0698 1268 0698 1373 0698 1374 0698 1375 0698 1576 0698 1377 0698 1580 0598 1581 0698 1400 0558 4142 0757 09 0737 0928 0757 0920 0757 0955 0757 0929 0757 0981 6 12 Table 6 2 Replaceable Parts Cont d Model 4260A Description Mir Part No TQ RIFXO RI1FXD RIFXD RIFXD R1FXD RIFXD RiFXO R1FXD RIFXD RIFXD RIFXxD R FXD RIFXxD R IFXD RIFXO RIFXD RIF xO RIFXD RIFXD R1FXD RtFxO R1FXD RUF xD RIFXD RIFXD RiFxD RIF xD RIFXD R1FXD RIF XD RIFXD RIFXD RIFX RIFXD RiFXD RIF XD RIFXD RIFXD RIFXD RiFXD RIFxXD RIFXD R FXD RIFXD RIFXD R FXD R FXD COMP COMP COMP 270 OFM 1 746 27K OHM 58 1 48 270K OHM 5 1744 COMP 300 OHM 5 1 56 COMP 3000 OHM 58 isu COMP OHM 5 174 COMP 330 OHM 5 1 44
4. 4013 L ION Sa Pasadend Calil 82118 Ureversal Electri Owosso Mich Electric Gay uns ambertvilia 1 78854 Oak Menufecturing Co Phanostran In lrumeni and Elertianiz Du South Pasadena Calil Philadelphia Staal and Wire Corp Philadelphia American Machine amp Foundry 00 Potter amp Brimli amp ld Div Princeton Ind TRY Electronic Componema Du Camden General Instrument Gorp Div fiooklyn Harrisbulg Torrance Calit Regislanre Products feubbarcea t Corp of Calit Shakeptend of lingis Tool Works Elgin Ill Signal Indicedor Corp New Fork Stuthers Guan Ine Pitman N J Thompson Biemel amp Co Chicago 111 Tilley Wig Stackpole Carbon Co Standard Thansam Corp Tinnerman Promicts Ing Trarstormar Engineers Ucirute Co Waldes Kohinaor lac Veeder Root Wenco Mfg ContingntabWirt Elactromes Dac p Philadelphia Rochelle Francisco 21 Marys Walinam Maas Cleveland Dhoo fan Gabriel Calif Mewtpnvill Mass Long Island City WAY Conn Chicago Zareh Mfg Caro Mepra Division of Sessions Clor Co N J Schnitzer Alley Products Co Elzapeth New York N Y Elactinic Industries Association Any brand Tubs menting standards Washingion 0 6 Uninar Switen Div
5. 42604 Section IV Paragraphs 4 1 to 4 16 SECTION IV THEORY Of OPERATION 441 INTRODUCTION 4 2 This section includes circuit operation details for the Universal Bridge general description of operation is given lirst with details of the various circuits following Each assembly in the instrument is discussed in the order of its assembly designation A100 A200 etc as listed in Tahle 4 1 Table 4 1 Assembly Designations 100 Range and Function Switch A200 Power Supply and 1 kHz Oscillator A300 Reference Voltage 04260 7021 04260 7022 04260 7023 A400 Detector 04260 7024 A600 Decimal Point and Direction Indicator 04260 7026 4 3 DESCRIPTION 4 4 GENERAL 4 5 For capacitance and inductance measurements with the FUNCTION switch set to Cp AUTO or Ls AUTO a 1 kHz signal drives the bridge and balance achieved by selecting the proper range and adjust ing only the CRL control This is possible because a voltage controlled resistor is substituted for one resistor in the bridge circuit Thus simultaneous adjustment of more than one control is eliminated 4 6 BLOCK DIAGRAM 4 7 Figure 8 2 illustrates the bridge and auto null circuits The auto null circuits are used when the FUNCTION switch is set to Cp AUTO or Ls AUTO position As seen in Figure 8 2 the phase detector receives two signals 1 an error voltage from the detector amplifier which is proportional to bridge unbalance an
6. Resistance Network for Checks Ferri non Top and Bottom Internal Component Location Modular Cabinet 44 Schematic Diagram Notes Overall Block Diagram es Range and Function Switch A100 Decimal Point and Direction Light A600 Component Location and Schematic Diagram Power Supply and 1 kHz Oscillator A200 Component Location and Schematic Diagram Reference Voltage Assembly A300 Component Location and Schematic PP Detector Assembly A400 Component Location and Schematic Diagram 8 11 List of Llustrations Section I Figure 1 1 1 0 Figure 1 1 Model 4260A and Accessory Model 4260A 02337 1 Model 4260A Section I Paragraphs 1 1to 1 13 SECTION I GENERAL INFORMATION 1 1 DESCRIPTION 1 2 The YHP Model 4260A Universal Bridge Figure 1 1 makes fast easy measurements of resistance R capacitance C inductance L capacitor dissipation factor D or inductance quality factor Q The in strument includes five bridge circuits selected by the FUNCTION switch as well as the detector and 1 kHz oscillator necessary for dc and ac measurements For measurements at frequencies other than 1 kHz an external oscillator must be used 1 3 Front panel controls select the measurement funetion and range with R L and C
7. Electronics United Tignsfermer Corp Calord Elecite Corp Baus Laboraigues Inc Robertshaw Un Al Star Products Inc Avery Adhesive Label Conn New York 4 7 Chicago Riverside Cali Detignre hia Monrovia Calif From Handhork Sut lg rante H4 Dated DECEMBER 1554 H42 Dated MARCH 1952 6 15 Section VI Table 6 3 Code Ma gni 52208 E2218 51383 82647 82871 52891 83053 43054 83085 83125 86 83298 83315 85330 83385 83501 83534 83777 Address Mnnufacturar Hammarlund u Ine Arnold Co Int Idernatignal Instruments Inc Grayhill Co LaGrange Ill Triad Tiansformar Corn Venice Galil Hinghegle Electronics Inp Norwalk Calif Spec ificalion ers Wilko Products inc Cleveland Qhig Rechter Calif The Airpax Products Co Cambritge Mass Barry Cendroig Barry Wigal Wallerian Mass Skok e New York Beston Mass Orange Conn Carlen Precision Elecine Co Faraday Inc Cooper tre Electronics af Speer Co Du Pa Fairchild Inst Gup Defense Prod Division Clifton Indusiuas Inc Conn Sylvania Electric Pind
8. COMP 2700 OHM 10 1 48 R325 0684 8221 RIFXO COMP 8200 OHM 105 1 5W R326 0684 1031 RIFXD COMP 10K 10 1 4 R327 0684 1521 RI FXD COMP 1500 OHM 108 1 4W R328 0684 2741 RiFXD COMP 270K OHM 108 1 4W R329 0684 6821 RIFXD COMP 6800 OHM 10 174W R336 0684 2721 RIFXO COMP 2700 OHM 108 1 4W R331 0684 5621 COMP 5 6K OHM 10 1 49 3t See list of abbreviations In Introduction to this section 02337 1 6 5 Section VI Table 6 1 Model 42604 Table 6 1 Reference Designation Index Cont d 9 Stock No Description Note R332 R333 R334 R335 8336 R337 R338 R339 R340 R341 R342 R343 R344 R345 C403 C402 403 2404 405 C406 2401 09 416 C411 C412 C413 2414 Cais 416 6417 Cu18 2419 2420 421 0422 8401 402 3 40 CRaOS CRHO6 408 9 CR410 CRd11 CR412 0683 1225 0688 4721 0683 5629 0682 8225 0683 6825 0688 4721 0683 3025 0683 3625 0683 2425 0683 1355 0683 1255 0683 3015 0683 5655 0688 4721 04260 7024 9180 0708 0160 1271 0160 1542 0180 1032 0160 1271 0160 1545 0160 1271 0180 1029 0180 0756 0180 0756 0180 0756 0160 1271 0180 0756 0180 0756 0180 0756 0140 0204 0140 0194 0160 1544 0180 0945 0180 1032 0180 0966 0180 1025 1902 0927 1901 0040 1901 0080 1901 0040 1901 0040 1910 0016 1910 0016 1910 0016 1910 0016 1910 0016 1910 0016 1910 0016 RIFXO
9. Wallham Mass Internatignal Electronig Research Gora Burhans Cahit Columsia Technical York Yaran Associales Palo Alto Marshall Ind Products Div San Marino Cali Control Switch Division Controale Co af Ananta El Segundo Calif Delevan Eleclroni s Eagt Avrora Corporation Indianapolis Ind Renbrand3 Inc Boston Wass Hoffman Elacstonies Corp Samicondyeter Div Techaclogy Instrument Corp of Calif Newbury Pare Galil E Monte Galil THE FOLLOWING VENDORS HAVE MO NUM BER ASSIGNED IN TME LATEST SUPPLEMENT TO THE FEDERAL SUPPLY CODE FOR TURERS HANDBOOK datif 0000 90547 DMAE DLAK 0 01999 01031 Males Taal and Die Los Angetes Calil Western Corl Div pF Automatic md Int Redwood City Galil Willow Leathe Products Corp Newark N J British Radio Electonics Lid Wasningior D C ETA Englard Sremens America Components Div Pracision Instrument Components Co Rubber Eng Development ACN D Mig Go Cagir gn of Elgin Walch Eastern Lab 5 K Garth White Plans D Y Van Nuys Calif Hayward Calif Jose Galih Qaklard Cali Burbank Calif Burlington Les Angeles From FSC Handbook Supphemenis 4 Dated DECEMBER 1364 ated MARCH 1962 02337 1
10. Q is L the correet L or Q value of the unknown 3 59 PROCEDURE a Connect the measurement setup as shown in Fig ure 3 6 Ground only the 42604 cabinet to power line ground DETECTOR NOTE REAR PANEL 46 BIAS BATTERY J BIAS CAPACITOR Cpls DQ RESISTOR Figure 3 6 Dc Biased Inductance Measurement 3 9 Section Paragraphs 3 60 to 3 61 b Connect the unknown L to the UNKNOWN terminals CAUTION DO NOT APPLY DC BI S VOLTAGE GREATER THAN 6 VDC OR DC BIAS CURRENT GREATER THAN 10 MA c Set FUNCTION switch to Ls AUTO position for measurements with the internallkHz generator just RANGE switch and CRL control bridge bal ance meter null Read the measured L value on the CRL counter 3 60 RESISTANCE MEASUREMENT AT 1 kHZ 3 61 To make AC resistance measurement at 1 kHz refer to Figure 3 1 and perform the following steps Model 42604 a Remove shorting strap across DQ RESISTOR CsLp terminals on rear panel b Connect accurate 500 ohm metal film resistor 1 or less between right CsLp terminal and CpLs terminal immedlately below DO NOT REMOVE STRAP ON CpLs TERMINAL c Set DQ knobs full counter clockwise d Set FUNCTION switch to Lp HIGH Q e Make measurement using RANGE switch and CRL dial I Multiply inductance reading Henries by 10 000 to convert to ohms For example 1 millihenry is 10 ohms 02237 2
11. Giemal Mfg Int Wakefield Wass K F Development Redwond Cilv Calif lac Meera Santen Div Dakland Calif Mass Rochester Spr ng Gn Inc of Inguslry Cali Insul led Wire Inc Sylvania Electric Prod Int Semiconductor Div Wabuin Mass Code 53365 33788 amu 34 37 3414 91146 54154 94187 91222 34310 34330 34682 35123 85236 35236 95263 95264 95265 35275 3 348 35354 35887 36067 95035 85255 95296 36130 35341 96501 314614 37119 91479 97983 38141 88158 38270 30231 91405 Manufacturer s Code List cont d Manufacturer Address Robbing and Myers Inc Stevens Mig Inc Moward J Smith Inr 1 1 Controls General Gable Corp Raytheon o Camp Ind Comp Operal 1013 Quincy Wasa Sciant dic Electronics Products Ine Loveleng Colo 1 York NY Vansfigld Ohio Mendauth B J Bayonne Tung Sal Electric Inr Curtiss Wright Corp Eleclranics Div South Chester Gorp Preducts Components Div Huntington Md Wire Cloth Products c hL Worcester Prassed Aluminum Corp Worcester Nass George Philbric
12. Rotate DQ control cew until the black line on the right off scale end of DQ dial aligns with red index Ls AUTO Ls LOW Q Lp HIGH Q ew wo YY Decimal Lights Units mH mH mH H H H 5 29 BRIDGE CIRCUIT COMPONENT CHECKS 5 30 INTRODUCTION The procedures in Para graphs 5 31 through 5 38 outline checks and adjust menta ior the components in the bridge circuit These include fixed 0 2 capacitor CI compensating capacitor C305 CRL resistor R3 trimmers C103 C104 C3 and accuracy of resistors in the RANGE line on front panel window Dual wire wound resis switch The test equipment setup 1s shown in Figure tor R54 B should also be full cew 5 5 These checks and adjustments should be per formed inthe order listed when a comprehensive over all instrument checkout is desired Test equipment d Tighten two setscrews This completes the for these checks is listed in Table 5 6 adjustment 200 0 OSCILLATOR 4260 HP5245L COUNTER 175A 1750A OSCILLOSCOPE USE SHIELDED CABLE AND CONNECT J4 8 CABLE SHIELD 20060 050 IKHz IV SCOPE CHAM A POLARITY UP CHAN B POLARITY UP TRIGGER EXT FUNCTION CHOPPED SENS O RV CM SENS Q 2V CM Figure 5 4 Error Signal Amplifier Phase and Gain Test Setup 5 8 02337 1 Model 4260A Oscillator Resistance Bridge Resistors 5 31 CHECK To check fixed bridg
13. 11 10153 110 133 Packard France dte d Or Rh ne 35 66 Packard France Wevard Massena 38 87 18 GERMANY Hewlett Packard Vertriebs GimbH Lietzenburger Strasse 30 1 Berlin W 30 Tel 24 86 36 Hewlett Packard Vertriebs GmbH Herrenberger Strasse 110 703 B blingen Wlurttemberg Tel 6871 Hewlett Packard Vertrfebs GmbH Achenbachstrasse 15 4 D sseldorf 1 Tel 68 52 58 Hewlett Packard Vertrlabs GmbH Kurhessenstrasse 95 6 Frankturt 50 Tel 52 00 36 Hewlett Packard Vertriebs GmbH Beim Strahhause 25 2 Hamburg 1 Tel 24 05 52 Hewlett Packard Vertrigbs GmbH Reginfriedstrasse 13 8 Munich 9 Tel 49 51 21 GREECE Kostos Karayannis 18 Ermou Street Athens 126 Tel 230 301 NCA ASIA AUSTRALIA ALIA Electronics Vic Pty Ltd fair Street SE 6 Yictoria 1371 4 lines Electronics V Pty Ltd Street lee South Wales 5338 MA Salespower amp Agency Ltd Co 17 90 Instrument Co Ld d dur Sapru Road 1 1 Instrument Co Dadebhaj Road 1 642 The Scientific Instr Co Ld 11 Esplanade East Calcutta 1 Tel 23 4128 The Scientific Instrument Co Ld 30 Mount Road Madras 2 Tel 85319 The Scientific Instrument Co Ld B 7 Ajmer Gate Extn New Delhi 1 Tel 27 1053 IRAN Telecom Ltd P 0 Box 1812 Teheran Tel 43850 ISRAEL Electronics amp Engineering Division of Motorol
14. 12 11 OPERATION FROM 115 OR 230 VOLTS 2 12 The Model 4260 can he operated from either 115 or 230 volt 21075 50 to 60 Hz power lines slide switch on the rear panel permits quick conver sion for operation from either voltage Insert a nar row blade screwdriver in the switch slot and slide the Bwitch to expose 115 marking for 115 volt operation or 9230 marking for 230 volt operation The instru ments re supplied with a 0 1 ampere fuse for either 115 or 230 volt operation CAUTION Do not change the 115 230 switch setting during operation 02337 1 Section II Paragraphs 2 11 to 2 14 2 13 3 CONDUCTOR POWER CABLE 2 14 The Model 42604 is equipped with detachable 3 wire power cable Proceed as follows for instal lation a Connect flat plug 3 conductor female connector to AC line jack a rear of instrument b Connect plug 2 blade male with round grounding pin to 3 wire grounded power outlet Exposed por tions of instrument are grounded throughthe round pin on the plug for safety when only the 2 blade outlet is available use connector adapter HP Stock No 1261 0048 then connect short wire from side of adapter to ground 2 3 2 4 Section III Paragraphs 3 1 to 3 12 SECTION OPERATION 3 1 INTRODUCTION 3 2 This section outlines operation of the Universal Bridge operating procedure is given for each measurement function front and
15. Section VIII Model 4260A Figure 8 6 8 10 02337 1 Model 4260A 53 6 8V OSCILLOSCOPE VERT 2V cm HORIZ 2006 cm I 1 3 5 L2 6V 2 5V 1 6V Q 6 o 2 5 az l 3V TO 0 4V BIAS RANGE FOR CR4I9 15 AND CR420 DC VOLTAGE DIFFERENCE BETWEEN AND on D An0 is Less THAN WHEN BRIDGE IS AMPLITUDE ENVELOPE eee SEE PARAGRAPH 5 50 48V Qoo A CRL DIAL 0 2 HIGH FROM E BALANCE d B POLARITY RE VERSED WITH DIAL 0 2 i LOW 86v OSCILLOSCOPE VERT 1V cm HORIZ 200ys cm BRIDGE BALANCE SEE FIG 8 4 IkHz OSCILLATOR FOR COMMON WAVEFORM SETTINGS SEE PAGE 5 12 FOR MEASUREMENT PROCEDURE 2337 2 4260 A 20 __ __ __ _ A400 DETECTOR ASSEMBLY 04260 7024 ERROR SIGNAL AMPLIFIER 2Y_ FROM POWER SUPPLY lt lt 8404 2R407 R408 470 8200 15K R402 27K 8402 Rd 13 FROM C405 500 POWER SUPPLY r4 iv 4200 D wir p 0401 0403 1854 0071 1854 0071 0402 1853 0010 FROM i CC AIO 14 9 4 N BLK DIFFERENTIAL AMPLIFIER i MILLER INTEGRATOR R 33 9410 1804 0071 1 1 R4 1 I FROM NN SWITCH 910 Aloo 31 8 FROM 9 Adds GRN 6Y I I 270K FROM R
16. c Schematic Diagrams and part location illustrations Waveforms and voltages at indicated test points also included 8 3 The Block Diagram or schematic diagrams can be un folded and used with any other portion of the manual Section VIII Figure 8 1 Model 4260A SYMBOLS SWITCH DESIGNATIONS FRONT PANEL REAR PANEL CONTROL A3SIBR 2 1 2 SCREWDRIVER ADJUST MAIN SIGNAL PATH FEEDBACK PATH SWITCH St WITHIN ASSEMBLY CONDUCTING ELEMENT WIPER MOVES TOWARD WHEN CONTROL 15 ROTATED CLOCKWISE 2ND WAFER FROM FRONT POWER LINE GROUND 157 ETC CIRCUIT COMMON GROUND TEST POINT REAR OF WAFER F FRONT HAND GATE INHIBIT GATE TERMINAL LOCATION 27 2 1 2 VIEWED FROM FRONT OR GATE WAVEFORMS SHOWN ARE TYPICAL REFERENCE DESIGNATIONS REFERENCE DESIGNATIONS WITHIN ASSEMBLIES ARE ABBREVIATED ADD ASSEMBLY NUMBER TO ABBREVIATION FOR COMPLETE DESCRIPTION ASSEMBLY ABBREVIATION PLET ESCRIPTION 25 ci 25 1 A25A1 CR1 A25ATCRI PREFIX J3 J3 Assembly Stk No Assembly Series Na Assembly Assembly includes 25 1 fused to document Number Name Assembly changes 25 POWER SUPPLY ASSY osro eoor semiEs RECTIFIER ASSY 05100 60350 413 mounted on Assembly A25 J2 mounted on Rectifier Assembiy A25 Assembiy Numbers indicate Part of A25 Fins of 2 li WHT ORN GY reo 2 TO 5
17. 1 1 1 I I 6 3V 5 from 13 to Pin 6 3 of P Transformer Assembly 45 Terminal Connector A25X AL Numbers LI Pin Numbers Figure 8 1 Schematic Diagram Notes 02337 1 1 OSCILLATORI Qi INT EXT IKHz INTERNAL OSCILLATOR FREQUENCY SELECTOR DCV FOR RESISTANCE MEASUREMENT Q FUNCTION 1 2 eM 7 109 RESISTOR Z I Ce Lp 1 1 1 1 1 1 1 1 2 DQ RESISTOR t I I BIAS EN I I t 1 1 1 I L I COUNTER t CAPACITOR i 0123 RAPACITOR l 1 mis 1 1 121 BATTERY I N 1 L 4 1 i SELECTED NETWORK oa O ERROR NETWORK ERROR T AMPL UNKNOWN 71 FEEDBACK a AUTO 1 1 lt a DIFFERENT VARIABLE HIGH HIGH RESISTANCE AMPLIFIER IMPEDANCE MILLER MeEDANSE AMPL CIRCUIT INTEGRATI DIFFERENTIAL AMPL LIMITING y LIMITING AMPL AMPL PHASE MILLER SWITCHING COMPARATOR INTEGRATOR Scc REFERENCE GENERATOR Section VIII Figure 8 2 COUNTER SELECTED INPUT NETWORK DETECTOR rk FEEDBACK ma motes a DIRECTION INDICATOR DIFFERENTIAL AMPLIFIER amp MILLER INTEGRATOR VARIABLE RESISTANCE CIR
18. 4 35 The variable phase circuits receive an ac volt age from one arm of the bridge circuit and supply a square wave which is out of phase with the bridge driving signal at T2 The variable phase circuits include high impedance amplifier No 2 Q301 Q302 and limiting amplifiers Q308 and 0309 4 36 The 1 kHz signal from T2 3 and switch assem bly A100 is applied at A300 7 From pin 7 the signal is ac coupled through C301 to 9301 base 9201 and Q302 amplify the signal and supply it to limiter amp lifier Q308 From Q301 emitter the signal is also supplied to Q303 base in the reference phase circult Diodes CR303 CR304 limit signal peaks so Q309 in put is a clipped sine wave Limiting amplifier 9309 and diodes CR305 CR306 further limit peaks so 9309 output is square wave This square wave is the second input to the phase comparator circuit 4 37 PHASE COMPARATOR 4 38 Phase comparator Q310 Q311 receives two square wave inputs 1 one from the reference phase circuits which is in phase with the bridge driving sig nal and 2 a second from the variable phase circuits which has a phase relationship 8 with the bridge driving signal The phase comparator output at Q311 collector is a negative pulse whose duration is equal to phase angleg 4 39 The phase comparator acts as an AND gate that is when the variable phase square wave input at Q310 base is positive coing and the reference square wave at Q311 base is negati
19. Int Boston Mass Mani Fla Woodside H Y Long Island N V Burbank Call Sheridan Wyo Bridgeport Cana Bloomtiald WJ Paterson N J Chesler Pa Allies Products fara Contanatal Connecter Corp Mig Co Inc Leres Elacticaits National Co Vitrad nd Ine Gordos Cup Mathode Mig Ce Chicago III Baga Electric o Inr Franalia Hd Wackeasa Co Chicago 111 Huggins Labortones Sunnyvale alit Hi Q of Carp Daan N N Thoiderson Messaner Div of Maguire Industrias Inc Mt Carmel Hi Solar Manyfacturlag Los Angeles Calif Carlton Screw Chicago Microwave Assorialus Inc Burlington Mass Encel Trenstormer Co Qakland Industrial Retaining Ring lyvington N J Automatic amp Englewood N J Raon Resistor Corp Yonkers N Y Litton System Commun Div Rochells R Trantis 116 Jamaica N Y Rubber Teck Ing Gardana Fianeis L Moseley Pasadena Microdel Ins Passduna Calil Corp Wenargneck M Y Redwood Gily Galil 98731 38925 38978 38109 36313 39515 85802 99548 39534 59947 89417 Model 4260A Monyfocturer Address General Mills Ine Elachonies Div Minn Hills Electani s Gian Cove Div of Clevite
20. Section V Paragraphs 5 11 to 5 27 Install replacement R3 Adjustment is required re fer to Paragraph 5 27 CRL ADJUSTMENTS 5 22 DQ DIAL AND R5 REPLACEMENT 5 23 The DQ dial and resistor R5 are installed as calibrated unit and therefore not separately replace able Contact the nearest Hewlett Packard Sales Service Office for service assistance see lists at the back of this manual 5 24 ADJUSTMENTS 5 25 1 kHz OSCILLATOR LEVEL amp FREQUENCY With 42604 top cover removed connect oscilloscope and electronic counter to pin T of J2 Adjust R213 for level between 4 5 and 6 7 volts peak to peak with positive peak clipped not more than 100 microsec Adjust frequency with R210 for 995 to 1005 Hz Repeat level and frequency adjustments until both are within these values 5 26 ERROR SIGNAL PHASE AND GAIN To check phase and gain of the error signal amplifier ondetec ior assembly A400 the test setup of Figure 5 4 is required a Disconnect the shielded cable from pin 1 of J4 b Connect the equipment as shown in Figure 5 4 Bet 42604 LINE switch to ON d Adjust the oscillator output voltage to 1 volt peak to peak on the oscilloscope Set oscillator fre quency to 1000 Hz 1 Hz e Alternately adjust R415 and so that oscil lator output voltage and J4 pin 7 voltage are in phase and 14 pin 7 voltage level is between 0 9 and 1 1 volt peak to peak f Turnoff 4260A LINE switch and disconnect equip
21. 11711 11717 1181 11 14437 12859 17881 12930 13103 11396 11835 14083 nem 14493 14515 15203 1829 155583 15772 8818 158 16057 16352 16885 18758 17118 17974 19476 18455 18583 18973 19315 Teeth 1370 Instrument Cop Semiconductor Div Hawak Buena Pato Alta Calif Camden 8 3 Daver N H Products Group Imparat Elactronse Int Inc Philadaiphia Handle Mig Nippon Electric Cc te Tonya Jagan Meiex Elaclronica Cop Clark NJ Semiconductor Inc Beach Calif Tharmallby Dallas Texas Telefunken G M B H Hanover Germany Midland Kright Div of Pacific Industries Inc Kansas City Newbury Par Calif Seria Cali Conshohocken Lovalang Gelb Jose talif Hew York N Y N Hallywood Cali Galil Corp Amancan Componenta Ine Hewtett Packaed Conpany Dublini Electric Coup Mfg Co Webslar Elettronics Ca Adjustable Bushing Co Micron Electronics Dity Lang Island Century Goil Spring Santa Calif le ML View Daven Day Themes Edison Ind Long Island Coty Pine Lodi McGraw Edison Cn Spiure Pine Mics Conpute Diede Ideal Pree Meter Go Inc De I
22. 1200 OHM 55 1 48 RIFXD COMP 4700 OHM 108 1748 RIFXO COMP 5600 OHM 5 1 4W RIFAD COMP 8200 OMM 58 1 4W RIFXO COMP 6800 OHM 58 1 4W RIFXD COMP 4700 OHM 108 174W RtFXD COMP 3600 OHM 5 l W RIFXD COMP 3600 OHM 5 1 48 RIFXO COMP 2400 OHM 5 1 34 RiFXO COMP 13K OHM 58 1 4W RIFXD COMP 12K OHM 58 1 48 RiFXD COMP 300 OHM 5 1 48 COMP 56K OHM 54 1 48 COMP 4700 OHM 105 1 48 ASSYI DETECTOR CIFXD ELECT UF 15VDCW CIFXD 0 01 UF 5 SOVDCW My 1500 PF 10 50VOCW CiFXD TANT 10 UF 208 15VDCW CIFAD MY 0 01 UF 5 SOVOCW CtFXD MY 0 022 UF SK MY 9 01 UF 5 508068 CiFXO TANT 1 UF 20 15VDCW CiFXD ELECT 20 UP 15vyDCw ELECT 20 UF 15VDCW ELECT 20 UF 15VDCW CiFXD My 6 01 UF 5 50VDCYW CIFXD ELEGT 20 UP 15VDCW ELECT 20 UF 15VDCW CiFXD ELECT 20 15VOCW MICA 7 5 NPO SOOVDCW MICA 110 PF 5k 300 VOCW MY 700 PF SOVOCW ELECT 50 UF amp VDCI TANT 10 UF 20 15VDCW CiFXO TANT 220 UP 108 10VOCW TANT 22 UF 208 6VDCW SEMICON DEVICE 10IODE DIODESSILICON 30 iv 30 FIV DIODESSILICON 30 AT iv 30 PIV DIODETSILICON 30 AT iv 30 PIV DIODE3TSILICON 30 50 PIV DIODE GERMANIUM 100 0 85 60PIV DIODEIGERMANIUM 100 O B5V 60PIV DIODEIGERMANIUM 100 0 85 GOPIV 100 AT O B5V DI
23. 57 1 4 W comp 3 ohms 45 1 4 W Met film 15 9K ohms 0 5 14K ohms 0 25 and 1 91K ohms 1 Section V Paragraphs 5 31 to 5 33 Table 5 6 Test Equipment for Bridge Circuit Checks ITEM DESCRIPTION 19 MODEL OR PART NO Frequency 20 Hz to 20 kHz Output Level 2 volts rms Oscilloscope Vertical Sensitivity 100 Standard C 0 1 microfarad 0 1 8 0 1 Silvered Mica 0 01 microfarad 0 27 CS 0 01 200CD 140 A with 1400A Diff Ampl piug in HP 4260A 0686 1605 0683 1635 0683 3305 0683 1645 0683 3315 0883 1655 0683 3325 0698 3371 0698 4631 e Set rear panel INT EXT switch to EXT and set oscillator to 1 kHz f Balance the bridge and read measured C value Measured g Disconnect the parallel 16K ohms resistor from the UNKNOWN terminals Connect a 33 ohms 5 1 4 watt resistor in parallel with the standard capacitor h Change oscillator frequency to 20 kHz i Balance the bridge and read measured C value Measured Calculate the difference between 1kHz value and 20 kHz value steps f and i Difference should be within 0 2 nF If not within this tolerance change value of C305 and repeat 5 33 CRL RESISTANCE R3 AT 500 OHMS For maximum during measurements CRL sistor R3 should introduce no errors C305 selection provides hi
24. HP 42604 y 42604 UNIVERSAL BRIDGE OPERATING AND SERVICE MANUAL HEWLETT pu PACKARD VOgzt dH 1 HEWLETT PACKARD CERTIFICATION The Hewlett Packard Company certifies that this instrument was thoroughly tested and inspected and found to meet its published specifications when it was shipped from the factory The Hewlett Packard Company further certifies that its calibration measurements are traceable to the U S National Bureau of Standards to the extent allowed by the Bureau s calibration facility WARRANTY AND ASSISTANCE Hewlett Packard products are warranted against defects materials and workmanship This warranty applies for one year from the date of delivery or in the case of certain major components listed in the operating manual for the specified period We will repair or replace products which prove to be defective during the warranty period No other warranty is expressed or implied We are not liable for consequential damages For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual OPERATING AND SERVICE MANUAL MODEL 4260A UNIVERSAL BRIDGE SERIALS PREFIXED 601 602 This manual applies directly to standard Model 4260A Universal Bridges with prefix num ber 601 or 602 See Table 7 1 in Section VII Manual Changes and Options for changes re quired to adapt this manual to
25. Noisy null or no bridge null obtained for C and L meas urements without AUTO Noisy null or no bridge null obtained for C AUTO and L AUTO measurements Abnormal operation on direction indica tor Auto null ob tained properly Display out of speci fications not AUTO measurements Display in AUTO measurements out of specifications 5 6 One of the decimal point indi cator lamps should light when the 4260 is turned on Meter should deflect either right or left when 5102 set to R position Meter should deflect right when 8102 set to Cs Cp Cp AUTO Ls AUTO Ls or Lp position Bridge null should be obtained when 8102 is set to R position Bridge null should be ob tained when 5102 set to Ca Cp Ls or Lp position Bridge null should be ob tained when 102 set to Cp AUTO or Ls AUTO position Direction indicator light should shift from left to right or from right to left in the vicinity of bridge null and DQ readings within Specifications CL readings in AUTO measure ments within specifications Fuse blown Defective lamps 110V supply Switch contacts Defective meter circuit 40V dc supply Switch contacts Bridge circuit 1 kHz oscillator Error signal amplifier Switch contacts Bridge circuit Switch contacts Bridge circuit Switch contacts Bridge circuit Error signal amplifier oscillation High impedance ampli fier oscillation Switch contacts Auto n
26. Section TIT Paragraphs 3 48 to 3 55 For LOW Q Q of series L Q Qr DUE where Qk is the Q value at applied frequency f kHz and Qy is the Q reading on the Q scale 1 kHz For HIGH Q Q of parallel 1 Qr 9 3 48 INFLUENCE OF RESIDUAL AND LEAD IMPEDANCES 3 49 At frequencies above 1 kHz errors resulting from residual bridge impedances and lead impedances become significant Table 3 1 lists the correction terms for these errors 3 50 D AND Q MEASUREMENTS 3 51 GENERAL Measured D or Q values are a function of the frequency applied during measurement Figure 3 4 illustrates the possible values of D or Q for minimum error at various frequencies D or Q values which fall in the overlap area of Figure 3 4 can be measured with the FUNCTION switch set for any D or Q measurement except AUTO However below 650 Hz there is a groupof D values shaded area of Figure 3 4 which can be measured by adding an external DQ resistor This DQ resistor addition is outlined in the following paragraph 8 52 EXTENDING THE D AND Q RANGES ternalresistor added at the instrument rear panelDQ RESISTOR terminals will extend the D and Q ranges To avoid error Cp HIGH D and Ls LOW Q should not be extended below a value of 0 1 at the frequency of measurement The DQ resistor should be added as follows Cslp ONLY 200 500 2 5 20 50 IkHz IOkHz IGOkHz FREQUENCY EXTERNAL DQ RESISTOR REQUIRED Fig
27. lnc CTS Corp ITT Gannon Electic Int Cinema Engineering Co Clave amp Co Dis of Globe Union Inc Milwaukee Wis Chicago New Yok N v Chitapa Quincy Mass H Louis Wn Ill Elknart Ind Las Angeies Burgsnk Calif Chicago Vl Comme tial Plastics Ga The Cornigh Wire Co hirugo Miniatura Lamp 8 0 Gorp Crowley Div Cinch Wig Co Howaid Jones Orv 1 Dow Coning Elactra Mfg Conn Cole Cont John E Fast Ce Div Vietoreen Instr Chicago Bisok syn Dialignt Indiang Gensial Corp Elastronigs Dre Keasby WJ Orake Mig Co Midland Mich Prowidence 8 1 TD RS 37538 17764 17969 18188 T8283 18280 1853 78791 78947 1913 78251 19727 T8353 80031 60120 30130 Times Teleghete Equipment 80213 80485 30503 i D378 Eldana Corp 03877 Transilion Corp 03889 Pyrofi m Resistor Cu ne Cedae Knolls n 13564 Super Co Diva 10411 Ti Tal Ine Finderne Plan Sunervilla oie AM pe 1 Co of gaina ine 3 BA dme Wariant Hegeman El 1137 Chicago of California Int Westinghouse ir Brake Puttsbuigh
28. 04260 1038 7120 0445 04260 9990 04260 1059 42604 Tabie 6 1 Reference Designation Index Cont d Stock No Description R 3FXU 1 OHM 5 l1 2W RIFXD COMP 100K OHM 10 1 46 SWITCHISLIOE LINE SWITCHISLICE DPDT 115 230 3 SWITFCRISLIGELINT EXT OSC TRANSFORMER IPOWER TRANSFORMER 05 CABLE ASSYIFOWER CORD HOLDERtFUSE POST TYPE MISCELLANEOUS BRACKET BRACKETICOLANTER BUSHING FOR CRL CONTROL CABLETDIAL COUNTERICRE GEAR ASSYTCRL COUNTER DRIVE INGEX KNOB FOR CRL CONTROL KNOB FOR CRL CONTROL KNOBtDQ CONTROL VERNIER KNOB t FUNC T LON t RANGE KNOBt SENSITIVITY LENSIFINDER PULLEY FOR R5 SPRINGIDIAL CABLE WINDOW GLASS ITEMS BELOW FOR 100 OR 200 ONLY ADAPTERIPLUG 100 200 ONLY CHASSIS ASSYIINCL S2 J1 J4 PANEL 100 200 OPERATING SERVICE MANUAL 100 200 VAC ONLY Seo liat of abbreviations introduction to this section Model 4260 fp Stock No 0121 0039 0121 0205 0140 0194 0140 0204 0160 1031 0160 1039 0160 1045 0160 1161 0160 1227 0160 1271 0160 1510 0160 1515 0160 1549 0160 1542 0160 1543 0160 1544 0160 1545 0160 1548 0180 0708 0180 0756 0180 0773 0180 0945 0180 0962 0180 0964 0180 0965 0180 0966 0180 0967 0180 0978 0180 0981 0180 1025 0180 1026 0180 1029 0180 1032 0370 0050 0570
29. CIFXD TANT 47 UF 20 amp VOCW MY 0 01 UF 5 5OVDCW CIFXO CER 25 FF 10 S5OOVDCW FACTORY SELECTED PARTsTYPICAL VALUE GIVEN C1iFXD CIFXD TANT 47 UF 20 6VDCW TANT 1 UF 475 1506 5OVDCW ELECT 50 UF 5VDCW TANT 1 UF 20 1B5VDCW CIFXD CiFXD CAFXD TANT 1 UF 20 L15VDCW ELECT 50 UF 6VDCW TANT 1 UF 20 LSVOCW TANT 1 UF 20 15VDCW ELECT 50 UF amp VDCW CIFXD CIFXD CIFX CIFXD TANT 1 UF 20 15VDCW TANT 1 UF 20 15VDCW TANT 1 UF 20 L15VDCW MY 2200 PF 5OVDCW ELECT 50 UF amp VOCW DIODEISILICCN 30 1V 30 PIV OIODE SILICON 30 1V 30 PIV See list of abbreviations in Introduction te this section 02337 2 Model 4260 Section VI Table 8 1 Table 6 1 Reference Designation Index Cont d Stock Description Note CR363 1901 0040 DIGDEItSILICON 30 MA iv 30 PIV CR30U 1901 0040 DIODEtSILTCON 30 MA 30 PIV CR305 1901 0040 OIODETSILICON 30 iv 30 PIV CR306 1901 0040 100 51 100 30 1V 30 PIV 08307 1910 0016 DIODE GERMANIUM 100 0 85 amp OPIV CR308 1910 0016 DIODEtGERMANIUM 100 0 854 6 4301 1854 0071 TRANSISTOR SILICON NPN 2523914 6302 1855 0010 TRANSISTORSSILICON PNP 9303 1854 0071 TRANSISTOR ISILICON NPN 253391 0304 1854 0071 TRANSISTOR SILICON NPN 2N3391 0305 1853 0010 TRANSISTORtSILI
30. Difference between values for steps f and should be made minimum by adjusting C104 j Adjust C104 slightly and repeat procedure Ad justment is correct when difference between the two measured C values is minimum This completes C104 adjustment 5 36 C3 ADJUSTMENT Trimmer capacitor C3 is adjusted to compensate for transformer T2 capaci tance The procedure is as follows a Connect test equipment setup as shown in Figure 5 5 b Connect the 0 01 uF 0 29 with a parallel 15 9 ohms 0 5 1 4 watt resistor to the UNKNOWN terminals c Set FUNCTION switch to Cp HIGH D d Set RANGE switch for XX nF display e Set oscillator INT EXT switch to EXT f Set oscillator frequency to 1000 Hz 5 Hz g Balance the bridge and read measured D value D reading should be 1 0 05 h Remove ac power from the 4260 i Remove shorting strap across Cp Ls DQ RE SISTOR terminals on rear panel With another 42604 measure the de resistance between the ungrounded Ls DQ RESISTOR terminal and the white black lead end of j Adjust DQ control sothat the second 4260A meas ures 812 ohms Disconnect measuring 4260A and connect shorting strap across CpLs DQ RESISTOR terminals k Apply ac power to 42604 1 Without moving DQ control balance the bridge by adjusting CRL control and C3 Adjustment is cor rect when bridge null is obtained 02337 2 5 Model 42804 25 37 FIRST RANGE CHECK FULL CCW T
31. Poughkeepsie 12601 Tel 814 454 7330 TWX 510 248 0012 38 Saginaw Orlye Rachester 14623 Tel 716 473 9500 TWX 510 253 5981 1025 Northern Boulevard Ros yn Long Island 11576 Tel 515 869 8400 510 223 0811 5858 Fast Molloy Road Syracuse 13211 Tel 315 454 2485 710 541 0482 NORTH CAROLINA 0 Box 5187 1923 North Main Street High Point 27262 Tei 810 882 6873 TWX 510 026 1516 OHIO 5579 Pearl Road Cleveland 44129 Tel 215 884 9209 TWH 810 421 8500 1250 West Dorothy Lane Daytan 45409 Tel 513 298 0351 810 459 1925 OREGOM 2737 S W Corbett Avenue Portland 97201 Tel 503 228 5107 PENNSYLVANIA Park Place Office Bullding Camp HIII Tel 717 737 6791 QUEBEC Hawlett Packard Canada Ltd 275 Hymus Boulevard Pointe Claire Tel 514 697 4232 610 422 3022 Telgx 01 2819 PANAMA Electr nica Balboa S A Box 4928 Panama City Tel 3 0833 PERU Fernando Ezeta 8 Av Petit Thouars 4719 Casilla 3061 Lima Tel 50346 PUERTO RICG San Juan Electronics Ine Ponce de Le n No 150 Stan 3 Pta de Tierra Sta San Juan 809 725 3342 Monroe Complex Moss Side Boulevard Monroeville 15146 Tel 412 271 0724 TWX 710 737 3650 144 Elizabeth Street West Conshohocken 19428 Tel 215 248 1600 828 6200 TWX 510 660 8715 TEXAS Box 7166 3805 Inwood Road Dallas 75208 Tel 214 357 1881 TWX 810
32. 0000 1011 nF 101 1nF 101 1nF 101 1nF 101 1nF 101 1nF 101 1 nF 101 1 nF 101 inF 101 1nF 101 1nF 10 11 nF 1021 pF 0108 pF 0011 pF 0002 pF 4260 FRONT PANEL in Capacitance and D Accuracy Check less than 0 002 less than 0 002 0 0024 0 007 0 0159 0 088 0 056 0 112 0 575 1 2 10 more than 20 less than 0 002 less than 0 002 less than 0 002 B 0984 098 4 098 4 098 4 091 5 098 4 098 4 098 4 098 4 09 84 0974 0097 0009 0000 C Readings in C Readings D Readings Cp AUTO 1016 nF 101 6 nF 101 6 nF 101 6 nF 100 7 nF 101 6 nF 101 6 nF 101 6 nF 101 6 nF 10 16 nF 1026 pF 0103 pF 0011 pF 0002 pF For calibration subtract residual capacitance from measured value c Set FUNCTION switch to Cp AUTO d Connect 1 uF standard capacitor to UNKNOWN terminals e Set CRL counter to 1000 Set RANGE switch on nF range to light right decimal point light 5 2 02337 2 04260 8 bod 1 42604 Section V N Table 5 2 Table 5 2 Performance Checks cont d t Rotate CRL control for meter null at center and observe that CRL direction lights change at null position g Set FUNCTION switch ta Cs LOW D and adjust DQ dial for meter null Slight adjustment of CRL control may give best null Read the measured and D values These values should he within the 5 values listed above for the standard capacitors h Repeat the
33. 2 pf or less When capacitance measurements are made this residual capacitance should be subtracted from the measured value If external leads are used to connect the unknown the residual capacitance measurement should include the lead capacitance Errors caused by residual andlead capacitances arelisted in Table 3 1 8 3 Section III Paragraphs 3 21 to 3 23 4260 Table 3 1 Correction Terms for Residual Lead Errors Add to Measured Value as Indicated Measured Series Resistance Quantity 2 C 1 D No error Series Inductance Paralle Capacitance L o C 2 o x Qi T 2 1 4 1 Lo 4n L C D X 2 1 3 3 4 L 1 D 2 2 4 D 0 irequency unknown capacitance unknown D unknown inductance unknown Q 3 21 Cs AND Cp MEASUREMENT DIFFERENCES 3 22 The measured valueof capacitance depends on whether series parallel equivalent circuit is used for the measurement The relationship between series capacitance Cs circuit and a parallel capaci tance Cp circuit is as follows Cs 14 Cp where D is the measured D value The difference between Cs and Cp is large when D is greater than 0 1 but Cs is within 1 of Cp if D is 0 1 or less 3 23 MEASUREMENT PROCEDURE a Perform theturn on procedure outiined in Para graph 3 8 b Check to insure that the 3 DQ RESISTOR and BIAS terminal pai
34. 3 Manufacturer Address Loyd Scruggs Co Fass Aga inc A J Glesever Co tnr Div darker Tarzian Inc Boonton Melding Company A B Boye R M Gracanonte b lac Seamless Rubber Co Clifton Prac Products Cp Inc Citon Heights Precision Rubber Ploducis Gorp Dayton Radio Corp of America Electronic Comp amp Devices Diu Hansan Phila Goparation Lansdale Division Lansdale Pa Western Fibiows Glass Products Co San Faancisce Catil Van Walers amp Ragers Gan Franrisco Calif Tower Corp Piovidence Rl Cutler Hammer Lintata Could Natianal Batteries Inc t Paul Minn Federal Telephone Radio Corp Gliton N J Ganeral Melis Inc Buffalo Graybar Electric Co Ganaral Corp Schenectady N Y Unlad Transformer Ca Chicago Ill US Rubber Co Consumer Ind amp Plastics Fred Dw Passaic N J Bearing San Francisee Connor pring Mig Co an Francisco Willer iat A Nameplate El Manta Calif Radio Materials Co Chicago 11 Great WY San Franciaco Calit Met Bloomingian ind Boonton N J Francisco Calil San Francisco Cali Hamden Conn Chirapa 111 Bugat Inc Altleboin Mass Dale Electromrs Ing Columbus Nebr Cora Willow Grove
35. 508 CRI _ BLK 1 I Lp HIGH Q WHT BLU FUNCTION 400121 SI02F TO A200 P 2 3 4 RIO 5 gt 4 4 RIO4 i 6 1000 7 RIOS Em MHT REDIMIO s WHT RED BLU TROM FROM A400 14 FROM 440003 A600 DECIMAL POINT AND DIRECTION INDICATOR ASSEMBLY 04260 7026 fex WHT RANGE 510 WHT RED ORN opp RED TO 3 ss ww tue ur ur or oe or TO 134 A400 i51 WHT GRN 3 WHT GRN GY TO 400 8 NOTES TO 40019 1 UNLESS DTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE IN PICOFARADS 2 ASTERISK M INDICATES SELECTED COMPONENT AVERAGE VALUES SHOWN ARD COMPANY 04250 0 28 A Figure 8 3 Range and Function Switch A1 Decimal Point and Direction Light A6 8 5 8 Model 4260A 2 To 5 5 To 12 5vpc 95 115voc 02337 1 SWEEP SPEED 200ys cm AMPLITUDE IV cm 15 230 VAC 50 TO 60H NOTES UNLESS OTHERWISE INDICATED RESISTANCE IN OHMS CAPACITANCE FICOFARADS c2ol 214 CR20I 207 9201 207 201 220 COPYRIGHT 1966 BY HEWLETT PACKARD COMPANY ew EE 35 R204 580 Q203 1854 0071 CONTROL AMPLIFIER 1854 0071 REGULATOR KA OSCILLATOR Section VIII Figure 8 4 VER SUPPLY AND KHz OSCILLATOR
36. ASSEMBLY R204 680 1654 0003 REGULATOR 1854 0071 RIVER TO REF VOLTAGE ASSY 2 0203 1854 0071 CONTROL b T2 Assy 1 0 AMPLIFIER r9 WHT ORN R202 C203 I 2700 20uF I E gt ALK TO REF VOLTAGE ASSY I 2 TO DET assy A400 3 CRL LIGHTS A600 1 WHT RED BLU 4204 1854 0071 REGULATOR WHT RED BLU TO DET ASSY 400 SMHT BLK BLU SWITCH Al00 8 1809 TO 40 LY WHT BLK RED 40 1 TO WHT RED SWITCH 2100 3 TO thov SWITCH 0 39 OSCILLATOR 13 u WHT ORN ORN I YEL 1 1 1 1 2000 2210 1 20UF 4700 1 6208 I I R208 14 021219 35K I I IT ree Q207 EXT OSCILLATOR 1854 0071 8 203 30K TM 8769 WHT BLu 2 v WHT VIO 0205 r NT D4260 0 3A 1854 0071 I INT 4 o Ce KHa oo 7 2 2 J S3A INT Figure 8 4 Power Supply and 1 kHz Oscillator A200 8 7 Section VIII Model 4260A Figure 8 5 L 8 8 02337 2 04260 18 Em Model 4260 OSCILLOSCOPE SETTINGS TEST POINTS VERTICAL HORIZONTAL 20 mV cm use 101 probe 2mV cm use 10 1 probe 200 ys cm COMMON WAVEFORMS FIGUR
37. As a general check procedure the following questions are a guide for isolating trouble a external instruments operating and nected correctly b Is the unknown component connected correctly c rear panel shorting straps in place 5 14 REPAIR 5 15 COVER AND FRONT PANEL REMOVAL 5 16 Instrument covers are removed by taking out Screws eachcover To removefront panel remove all front panel knobs and side covers In Figure 5 3 locate the four screws which hold the side frames loosen these screws Carefully pull front panel towards front while holding side frames apart to release panel Loosen deck side screws also 5 17 PRINTED CIRCUIT COMPONENT HEPLACEMENT 5 18 To replace components on printed circuit boards the following procedure is recommended a Clip leads of defective component and remove b With toothpick and soldering iron clean compo nent mounting holes c Insert replacement component leads into holes Use heat and solder sparingly and solder leads in place d Refer to Paragraphs 5 39 through 5 51 for op eration checks of printed circuit assemblies 5 19 CRL COUNTER AND R3 REPLACEMENT 5 20 CRL COUNTER To remove this counter re move two screws B in Figure 5 3 and Hit out counter Refer to Paragraph 5 27 CRL ADJUSTMENTS be fore installing counter 5 21 CRL RESISTOR R3 For R3 replacement re move CRL knob and four screws in Figure 5 3 02337 1
38. Cail Spreng Cr 04870 Meter 950065 Twentieth Plashcs Inc Los Angeles 05272 Wastingnocse Electric Carp Semi Cenduclor Basa 05593 Engineering Co 05616 Cosme Plastic Electrical Spec 15624 Barber Colman 05728 Tiffen Dptiesl Co Roslyn Heights Long Island N Y 05729 Corp 05783 Seward Enginmering Ca 05820 Wanetield Eaguneering 106 15004 The GANS Bausch and Lamb phe Gn E T A Products of Aneta 00475 Devices Inc Northlake Redwood City Galit El Monte Celit Wastehestal Ill Youngwood Calif Sunnyvale Cleveland Dhia Rockford Wi Plainview 4 7 Cruz Mass Brdgaoort Conn Fochestel Burbank Call 76442 Electroniz Inc 08585 Genera Devices o Inc 1151 Corp of America U Senzor Div New Rochelle N Y 05555 Beede Electrical instrument Inc Pengcook H H Indiavapalis Ind Fhner z Ariz 06212 Toringion Co Wasi Div Nuys JAC Ertel MeCullovgh D 388 Kalvin Co 17116 Glass Works Election Components Hapi 02126 Dignan Co 11 40 Revised ay 1965 02337 1 fen Calas Yan ys alil Bradiod Pasadais
39. Ill 72964 M Hadley Co Los Angeles Calif York 21335 The Bearing Cv New Brilgin Cena 13982 TarPnnlagiral Pindurls ol Industry 24455 G E Lanp Divis on 73051 Hanger Ce Inc Perk Cleveland Orie 13018 West Nass T3138 Helipot Div of Beckman Inst Inc Hounlaln View Calif P6385 Gries Repioducar Rochelle Princeign Ind amden N J 07581 Avnet Gup Los Angales Calif 41 New Mass 02083 Camera amp Inst Corp 24655 Radio 0079 Amp Inc Harrisburg Div BOTH Aucraft Radio Carp fal 07922 Minnesota Rubber Minneapolis 26462 Fite Ga of Ine 13293 Hughes Products Division 00815 Mertherm Engmeering Inc 07187 The Los Angeles Catal Burlington Wis 07100 Technical Wira Pioducts Inc 00853 Sangamo Electrie Co 7918 Continental Device Pitkans Div 10848 Goe Co 1089 Cal E Holmes Corp 21181 Allen Bradley 01255 Litton Indussrits inc Bevel y Killa Cali 11251 TRH Semiconductors Inc Lawndale Calif tees 01298 Texas Instruments Inc 65289 Bilin Dalbert Co Transistor Products Die ug Battery 03349 Tha Al igncg Big 01589 Par
40. J6 28480 04260 1041 BPACKETICOUNTER 28480 D Part No 0757 0947 0757 095 0757 0952 0757 0983 0757 0955 0757 0959 0757 0960 0757 0968 1120 0734 1140 0030 1205 0055 1251 0048 SD 615UR 1251 0141 H 1061 2 342014 4410 0033 1510 0011 1853 0010 1554 0003 1854 0022 164792 1901 0026 1901 0028 1901 0040 1901 0045 1902 0031 1902 0057 1902 0057 1910 0016 2100 1171 2100 1172 2100 1776 2100 1777 2110 0119 NE 2 1 6510 3101 0206 3101 0244 7120 0445 8120 0078 9100 0729 04235 8604 04260 1039 04260 1058 04260 1049 04260 1041 3t See list of abbreviations in Introduction to this section Section VI Table 6 2 dem 717 de des J Pe A Moa Fee eee ee e ee merere eure Bection VI Table 6 2 04260 5021 04260 5022 04260 5028 04260 5024 04260 5027 04250 50509 04260 5099 04260 7021 04260 7024 04260 7025 04260 7026 04260 7028 04260 7027 04260 7031 04260 7032 04260 8542 04260 8541 04260 8602 04260 8603 04260 8604 04260 8702 04260 6705 6 14 Table 6 2 Replaceable Parts INSULATORI2 EACH INSULATOR Z EACH CONNECTORIFOR BIAS BATTERY LENSIFINDER WINDOW GLASS INDEX PULLEY FOR RS ASSYTRANGE AND FUNCTION SWITCH ASSYIDETECTOR CHASSIS ASSY INCLTSesJ J ASSY tDECIMAL POINT AND DIRECTION IND RIVAR WW 5K OHM GEAR ASSYICRL COUNTER DRIVE RivaR ww 16K OF
41. NEW MEXICO Box 366 Station C 87108 6501 Lamas Boulevard N E Albuquerque Tel 505 255 5586 TWX 910 989 1665 156 Wyatt Drive Las Cruces 88001 Tel 505 526 2486 TWX 910 983 0550 Hewlett Packard Canada Ltd 1415 Lawrence Avenue West Tel 1416 249 8196 TWX 610 492 7382 CENTRAL AND SOUTH AMERICA ARGENTINA CHILE Mauricio Su rez H ctor Calcagni Telacomunicaciones Casilla 13942 Carlos Calvo 224 Santlago Buenos Aires Tel 480 505 393 119 Tel 30 6312 34 9087 COSTA RICA BRAZIL Lic Alfredo Gallegos Gurdi n Ciental Importac o Apartado 3243 Com rcio Ltda San Jos Rua Cleto Campelo 44 5 andar Tel 21 86 13 Recife EL SALVADOR Ciental Importa o Electr nica Com rcio Ltda Avenida 13 de Main 13 22 andar Apartado Postat 1589 Rio de Janelro G B Tel 4683 Cientai Cam reld Ltda Rua Des Eliseu Guilherme 62 580 Paulo 8 Tel 70 2318 GUATEMALA Olander Associates Latin America Apartado 1226 7a Calla 0 22 Zona 1 Guatemala City Tel 22812 MEXICO Hewlett Packard Mexicana S A de C V Eugenia 408 Dept L Mexico 12 D F NICARAGUA Roberto Ter n G Edificio Ter n Apartado Postal 689 Managua Tel 3451 3452 NEW YORK 1219 Campville Road Endicott 13760 Tel 607 754 0050 510 252 0890 236 East 75th Street New York 10021 Tel 212 873 2023 TWX 710 581 4376 82 Washington Street
42. OHM 2X 1 88 8421 0683 1225 RIFXD COMP 1200 OHM 58 1748 R422 0683 1225 RtFXO COMP 1200 OHM 5 1 R423 0684 2721 RSFXD COMP 2700 OHM 10 1 48 Ru2u 0684 2741 R sFXD COMP 270K OHM 10 174W R425 0684 1041 RtEXD COMP LOOK OMM 108 1 46 R426 0 57 0947 R FXQ MET FLM 9 41 OHM 2 1 8W R427 0757 0947 FLM 9 1K OHM 2 L BW R428 0683 3645 RIFXD COMP 360K OHM 5 1 48 R429 0683 2745 RIFXO COMP 270K OHM 58 1 4W R430 0757 0935 MET FLM 3 0K OHM 2 1 8W R431 0757 0935 RIFXD MET FLM 3 0K OHM 2 1 BW R432 0684 1521 COMP 1500 OMM 10 49 R433 0757 0960 RIFXO MET FLM 33K OHM 2 1 8W R434 0757 0960 MET FLM 33K OHM 2 1 8W R435 0757 0939 RIFXD MET 4 3K OHM 2 1788 R436 9157 0939 RIFXO MET FLM 403K OHM 2 L amp W R437 0684 1521 RIFXD COMP 1500 OHM 08 174W R438 0757 0960 RIFXD MET FLM 33K OHM 2 1 8N 2439 0757 0960 FLM 35K OHM 2 1 BW 8440 0757 8939 MET FLM 4 3K OHM 2 1 54 0757 0939 MET FLM 463K OMM 28 1 8W 0684 1041 RIFXO COMP 100 OHM 10 1 4 R443 0683 6835 COMP OMM 5 1 4W 2444 0684 6821 COMP 6800 OHM 08 174W 0684 1041 RIFAD COMP 100K OHM 108 1 4W 445 0683 6215 COMP 620 54 1744 81447 0683 6215 RIFXD COMP 620 OHM 58 1 4 0685 6215 RIFXD COMP 620 OHM 5 1748 R44 9 0683 6815 RIFXO COMP 680 58 1 48 8450 0683 1215 Rt FXD COMP 120 CHM 58 1 uW R451 0684 2721 RIFXD CO
43. Relays Div Takes Capacitor Co Cranford Ned 25387 Hamilton Watch Ca Hawthorne 2BABO Hewlall Packard fo Pichena 5 0 Raytheon C Los Angeles Cali 02932 Raytheon ig 33111 Rerewng Tuba Dam Los Angalas Milmauxge Wis Hamdan Cann Hartiord Labgeatorles Phitwdalphe Chicaga Ill Cingiangti Elyria Goshen 108 Bron San Jase H J Mass Southampton T486 1 Gundanser Corp Chicago Laxlaglon Moss 74888 Products of Amphanni Westminster Md Borg Elactionies Cup Danbury Conn Waltham Masa E F Johnsaa in Waseca Minn Selma TS042 International Resistance Philadelphia Pa Chicago 11 lames Knighis Co Dallas Texas Yan Nuys Calif IL Engineering Santa Clara Call 18718 02114 Ferimacube Cain of America Saugaitias 10288 Rubber and Plastics Inc Pels Alle Calf 02880 Amphenol Borg Corp Chicago 02735 Radin of America Semiraneurlm and Materials Div 12771 Veeghane Co of America Inc Chicago T3846 Goshen Stomping amp Toc Co Englawooc Colo 73899 Electronics Carp indianapalls id 51983 Sanborn Co Costa Mesa Calif 34014 Shabicross Mfg Co Te
44. TEE TEMPS Cover and Front Panel Removal Printed Circuit Component Replacement CRL Counter and R3 Replacement DQ Dial and R5 Replacement Adjustments Bridge Circuit Component Checks Operation Checks of Printed Circuit Assemblies 2 Power Supply and 1 kHz Oscillator Assy A100 Reference Voltage Assembly 00 Detector Assembly 400 I I I I I L l l og 1 H 1 DE CH CH CH Q CU QU a re b 1 gt gt QD PO B ed Ra ER ED RT On l I I Cn Qn cn Ch c c c CI cn cn on Ch gi dn 1 LACEABLE 5 6 1 Introduction 6 2 Ordering Information VP VI coo VII UAL CHANGES AND OPTIONS 1 Manual Changes 1 3 3 CIRCUIT 5 8 1 Introduction 5 LIST OF TABLES P Specifications TM Correction Terms for Residual Lead Errors Assembly Designations Performance Check Test Equipment Performance TIPP
45. Test Equipment Required for Troubleshooting Trouble Symptoms and Possible Causes PED Decimal Point and Units Indication Logic Test Equipment for Bridge Circuit Checks Reference Designation Index EM Replaceable Parts eee nnn res Manufacturer s Code List r 1 1 A ka CO t GO CS OMe dM an Gn h cn gn cn a om I o ta rS Qh KH CO DO Sn C UO Cb Ch Cn 1 gt t s om nr r iv 02337 1 Model 4260A 02337 1 Figure LIST OF ILLUSTRATIONS Model 42604 and Accessory OP Adapter Frame Combining Case 0 Front and Rear Panel Controls Indicators and Connectors Capacitance and Inductance Errors in AUTO vs D amp Q Operation with External Generator DQ Range vs Frequency De Biased Capacitance Measurement Dc Biased Inductance Measurement Basic Bridge CRL Light Capacitance and D Accuracy M Internal Oscillator Check A Right and Left Side Internal Component Location Error Signal Amplifier Phase and Gain Test Setup 1 Test Setup for Adjustments
46. Ti Bad a 13 Model 42604 Section VI Paragraphs 6 1 to 6 6 ML SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering replacement parts Table 6 1 lists parts in alpha numerical order of their reference designators and indicates the description and HP stock number of each part together with any applicable notes Table 6 2 lists parts in alpha numerical order of their HP stock number and provides the following information on each part a Description of the part see list of abbreviations below b Typical manufacturer of the part in a five digit code see list of manufacturers in Table 6 3 Manufacturer s part number 6 3 Miscellaneous parts are listed at the end of Table 6 1 6 4 ORDERING INFORMATION 8 5 obtain replacement parts address order or inquiry to your local Hewlett Packard Field Office see lists at rear of this manual for addresses Identify parts by their Hewlett Packard stock numbers 6 6 To obtain part that is not listed Include a Instrument model number b Instrument serial number c Description of the part d Total quantity used in the instrument TQ column d Function and location of the part REFERENCE DESIGNATORS sagembly E misc electronic part P plug v vacuum tube neon B z motor F fuse Q transistor bulb photocell etc BT battery FL filter R resistor YR voltage regulato
47. and Cp Measurement Differences 3 4 3 23 Measurement Procedure 3 4 3 25 Voltage Across Unknown 3 5 3 27 Influence of D in Cp Auto Measurement 3 5 3 29 Inductance Measurements 8 5 3 80 Introduction VOTI 3 5 3 32 Residual Inductance 3 5 3 34 Ls and Lp Measurement Differences 3 5 3 36 Measurement Procedure 3 6 3 40 Influence of Q in Ls Auto Measurement 1 3 6 3 42 Special Measurements 3 6 3 43 20 Hz to 20 kHz Measurements 3 8 3 46 Operation with External Generator 3 1 3 48 Influence of Residual and Lead Impedances 3 8 3 50 D and Q Measurements 3 8 3 54 C Measurements with DC Bias 8 8 3 51 L Measurements with DCBias 4 9 IV THEORY OF OPERATION 72748966 4 1 4 1 Introduction 6460444 4 4 1 4 3 Description 4 1 4 4 General 4 1 4 6 Block Diagram 2 4 1 4 8 Basic Bridge for Resistance Measurements 4 1 4 11 Basic Circuits for Capacitance Measurements 4 1 4 13 Basic Circuits for Inductance Measurements 4 1 4 15 Range and Function Switch 100 4 1 4 18 Power Supply and 1 kHz Oscillator 200 4 3 4
48. arm of the bridge circuit for balancing during a measurement The selected resistor correctly attenuates the applied signal Ca pacitors C101 through C105 provide frequency comp ensation for certain ranges when ac voltages are applied during L or C measurements 4 1 Section IV Figure 4 1 4 2 De Resistance K Rx RaRb Rs Parallel Capacitance Cp HIGH D 0 05 to 50 at 1 2 Cx Ct Rb Ra _ 1 1 Cx Rx Inf CLRe f frequency D Series Capacitance Cs LOW D 0 001 9 12at 1 kHz Cx Ct Rb Ra Dx 2 1 Rx 2 f Ct Rc f frequency Parallel Capacitance Cp AUTO Cx Series Inductance Ls LOW Q 0 02 to 20at 1 kHz Lx Ct Ra Rb 2 11 Rx 2rfCtRe f 1 Parallel Inductance Lp HIGH Q 8 1000 at 1 kHz Ct Ra Rb 1 2x lx frequency Series Inductance Ls AUTO Lx Ct Ra Hb Model 4260A A de voltage from battery BT1 is applied between bridge points 0 and P Variable resistors Ra and Hb are adjusted for a zero or null reading on the indica tor With a null condition voltage drops across bridge arms XP and YP are equal and the bridge is said to be balanced Thus the value of unknown Rx can be determined from the basic relationship Rx Rb or Rx RaRb Rs Ha Rs This circuit is similar to the basic R circuit but note that capacitor is inserted in parallel with DQ control Rx in parallel w
49. because it provides maximum null resolution and stability for the loop circuit 4 31 REFERENCE PHASE CIRCUITS 4 32 The reference phase circuits reconstruct the bridge driving signal from 2 and compose a 1 kHz square wave which is in phase with this driving source This reference square wave is applied to the phase comparator The reference phase circuits include high impedance amplifier No 1 Q305 Q306 dii ferential amplifier 9303 Q304 and limiting amp 1 0307 4 33 The 1 kHz signal from T2 4 and switch assem bly A100 is applied at A300 9 From pin 9 the signal is ac coupled through C307 to 9306 base 306 and Q305 amplify the signal current and apply it to dif ferential amplifier transistor 0304 Capacitor C305 is selected to provide positivefeedback to Q306 This compensates input capacitance of the amplifier and stray capacitance of CRL resistor R3 The other in put to the differential amplifier is from Q301 emitter which is the other signal fromthe bridge circuit Thus the differentially summed output at Q303 collector is a reconstructed sine wave in phase with the bridge driving signal From 9308 collector the sine wave is ac coupled through C309 9307 base Diodes CR301 CR302 limit peaks so the output from Q307 collector is a squared wave This squared wave is ac coupled through C31 to the phase comparator circuit 4 3 Section IV Paragraphs 4 34 to 4 52 4 34 VARIABLE PHASE CIRCUITS
50. by Date PERFORMANCE CHECK TEST CARD Description Capacitance Measurement Inductance Measurement Dc Resistance Measurement Internal Osciliator Accuracy 1 1 4139 _____ LOWD 5 0 002 _____ HIGHD 5 0 05 _ Accuracy 1 1 digit ____ 10 ohms to 1 megohm 195 1 digit Accuracy 10 milliohms to 10 megohms 2 1 digit Frequency 980 Hz C J 1020 Hz Voltage 80 mV rms 120 rms 5 4a Se EE component 8 11 TROUBLESHOOTING 5 12 Thebestapproach to isolating trouble is to first ensure that the trouble is not a result of conditions external tothe 42604 then obtain all possible inform ation from the controls and indicators and logically apply this information to locate the defective unit or Figure 3 1 Controls and Indicators front panel Controls and Connectors rear panel and component location figures and schematic diagrams be used to understand operation and locate parts Table 5 3 ists test equipment required for trouble L shooting Table 5 4 Troubleshooting lists possible trouble symptoms and checks for their cause Table 5 5 shows decimal point and units indication logic Troubleshooting of printed circuit assemblies is simp lified if a suspected assembly is replaced with an op erating assembly Printed circuit operation checks 1 are outlined in Paragraphs 5 39 through 5 51 5 13
51. older instruments Copyright HEWLETT PACKARD COMPANY 1965 1501 PAGE MILL ROAD 1 ALTO CALIFORNIA U S A MANUFACTURED EY YOKOGAWA HEWLETT PACKARD LIMITED JAPAN 02337 2 Printed MAY 1967 Model 44003 Table o Contents TABLE OF CONTINTS Section Page I GENERAL INFORMATION 1 1 Description l i 1 4 Terminology 1 1 1 8 Instrument Identification 1 1 1 8 Applications sett nnn 1 1 1 10 Specifications 1 1 1 12 Auxiliary Equipment Required VETT 1 1 H INSTALLATION Ferte ih mmm as 2 1 1 Introduction MED 2 1 2 3 Unpacking and Inspection MED 2 1 2 5 Storage and Shipment 2 1 2 11 Operation from 115 or 230 Volts e n a 2 13 3 Conductor Power 2424 2 3 OPERATION 3 1 3 1 Introduction errem 3 1 3 3 Turn On 8 1 3 5 Use of the DQ Vernier 3 1 3 1 Dc Resistance Measurements arare nn ron 3 1 3 8 Power Considerations eer hr nmn 3 1 8 19 Measurements o 4 1 3 16 Capacitance Measurements 214 3 3 3 17 Introduction EP 3 3 3 19 Residual Capacitance 3 3 3 21 Cs
52. played in window below meter CAUTION FOR LOW RESISTANCE MEASUREMENTS For best connection to the bridge leads should be inserted into the binding posts and the binding posts should be screwed tightly to reduce contact resistance Short heavy leads canbe used Lead resistance should be measured with the ree ends con nected together Subtract the lead resis tance from the bridge reading 3 14 The fastest procedure for R measurements is as follows a Set FUNCTION switch to R position b Connect the resistor tothe UNKNOWN terminals Turn CRL control cw to 1030 d Increase SENSITIVITY for deflection right or left on the null meter 02337 1 Read measured resistance value on CRL counter Section III Paragraphs 3 13 to 3 20 e Rotate the RANGE switch until the meter pointer passes the null If meter deflection is right perform step f W meter deflection is left turn RANGE switch one step cw Adjust SENSITIVITY control for right deflection i Turn CRL control to obtain a null on the meter set SENSITIVITY control full cw adjust for the nuli with CRL control g Read the final resistance on CRL counter along with the units display 8 15 VOLTAGE AND CURRENT FOR UNKNOWN R When voltage and current values for the unknown are to be measured a dc voltmeter such as the HP 413A should be used with a current meter such as the HP 428B clip on milliammeter Make voltage and cur rent measurements as foll
53. to EXT and ad just oscillator frequency to 1 kHz f Balance the bridge and read measured C value Measured C _ nF g Disconnect the 160K ohms resistor and connect 330ohms 5 1 4 watt resistor in parallel with the silvered mica capacitor h Change oscillator frequency to 20 kHz i Balance the bridge and read measured C value Measured C _ nF Difference between C values of steps f and i should be made minimum by adjusting C103 j Adjust C103 slightly and repeat procedure C103 adjustment is correct whendifference between the two measured C values is minimum 5 35 C104 CHECK AND ADJUSTMENT Trimmer capacitor C104 is inside switch assembly A100 The adjustment can be done through the access hole in the switch assembly a Connect test equipment setup as shown in Figure 5 5 b Connect the 1000 pF silvered mica capacitor with a 1 6 megohm 5 1 4 watt resistor in parallel to the UNKNOWN terminals 5 10 Model 42604A c Set FUNCTION switch to Cp HIGH D d Set RANGE switch for XXXX pF display e Set oscillator INT EXT switch to EXT and set oscillator frequency to 1000 Balance the bridge and read measured C value Measured C _ pF g Disconnect the 1 6 megohmresistor and connect 3300 ohm 5 1 4 watt resistor in parallel with the 1000 pF capacitor h Change oscillator frequency to 20 kHz i Balance the bridge and read measured C value Measured pF
54. 0077 0570 0256 0370 0267 0370 0272 0370 0275 0683 1045 0683 1215 0683 1225 0683 1235 0683 1335 0683 1845 0683 1855 0683 2025 0685 2035 0683 2225 0685 2425 0683 2445 02331 2 Table 6 2 Replaceable Parts Description Ct VAR C riyan CIFXD CiF xD CIF xD C1FXD CIFXD CIFXD CIFXD C1F xD CIFXD CIFXD CIFXD CiFXD CiFxD CIF xO CIFXD C FXD CiFXD CFAO CF xD CIFXD CIFXD CER 8 350VDCW CER 5 PF 250VDCWw MICA 110 PF 5 300 VOCW MICA 47PF 5 NPO 500VDCW CER 10 PF 10 500VDCW 25 PF 10 5Q0VDCW CER 4 PF 0 25 PF 500vVDCW PAPER 2000 PF 10 600yDC METAL PAPER 05 UF 10 250VOCW MY 0 01 5 5OVDCW MICA 1200 108 500VDCW MICA 2200 PF 10 500 0 8 MICA 0 2 UF 022 MY 1500 PF 10 SOVOCW MY 2200 PF 5 SOVDCW MY 4700 PF 5 SOVDCW MY 0 022 UF 58 SOVOCW 0 22 VF 10 100vDCW ELECT 3 UF 15vDCw ELECT 20 UF I15VDCW ELECT 50 UF 15VDCW ELECT 50 UF amp VOC TANT 1 UF 20 35 ELECT 100 UE 50YDOW ELECT 200 UF 25VDOW TANT 220 UF 10 10VDCW ELECT 500 UF 25VDCW TANT 1 UF 475 1596 SOVDCW ELECT 22 UF 160VDCW TANT 22 UF 208 vVDCW TANT 47 UF 208 6vDCW TANT UF 20 15VDCW TANT 10 UF 20 15 0 KNOB FOR CRL CONTROL KNOBIFUNC TION KNOBI SENSITIVITY KNOBIDQ VERNIER KNOBiDQ CONTROL RNOB FOR CRL CONTROL RIFXD RtFxD RI
55. 0757 0960 0757 0959 2100 1776 0757 0941 0757 0926 2100 1777 0684 2781 0757 0930 0684 6934 0663 2025 0683 5635 0683 1235 0685 8215 04260 8703 0180 0962 0180 0773 0180 1026 0160 1271 0160 1039 0180 1026 0180 0978 0180 0773 0180 1029 0180 1029 0180 0945 0180 1029 0180 1029 0180 0945 0180 1029 0180 1029 0180 1029 0160 1543 0180 0945 1901 0040 1901 0040 Model 42604 Table 6 1 Reference Designation Index Cont d TRANSISTORISILICON NPN TRANSISTORESILICON NPN TRANSISTORESILICON NPN TRANSISTORESILICON NPN TRANSISTORISILICON NPN 2N3391 2N3391 2N3391 243391 2N3391 TRANSISTORISILICON NPN 2N3391 RiFXD RIFXD RIFXD RIFXD RIFAD COMP COMP COMP COMP 2700 OHM 108 1 48 700 OHM 108 1 uW 6600 OHM 10 1 48 680 OHM 58 1748 4700 108 R F XD RIFXO RIVAR COMP 22K OKM 10 1 7 COMP 1800 OHM 10 18 FLM 33K OHM 2 1 8 MET FLM 30K OHM 2 L BW WW LOK OHM 10 LIN 1 2W RIFXD RIVAR R1FX FLM 5 1K OHM 2 1 8 FLM 1 2 OHM 2 1 8 Ww 20K OHM 10 LIN 1 2W COMP 270K OHM 10 1741 FLM 168K ORM 2 1 8W EBK OHM 10 2000 OHM 58 1744 56K ORM 5 174W 12K 58 1 4W 20 OHM 58 L uW R1FXD RIFXO RIFXD RiFXO COMP COMP COMP COMP COMP ASSYIREFERENCE VOLTAGE CIFXD TANT 1 UF 20 35VDCW CIFXD ELECT 50 UF 15VDCW
56. 1251 0048 ADAPTERIPLUG 100 200V ONLY 28480 1251 0135 CONNECTORIPRINTED CIRCUIT 15 CUNTACTS 95354 1251 0141 CONNECTOR118 CONTACT 28480 1251 0148 CONNECTORIPOWER 3 PIN MALE 60427 1400 0084 HOLOERIFUSE POST TYPE 75915 1410 0023 BUSFING FOR CRL CONTROL 28480 1510 0011 BINDING POSTIBLACK 28480 1853 0010 TRANSISTORISILICON PNP 28480 1854 0003 TRANSISTORtNPN SILICON 28480 1854 0022 TRANSISTORINPN SILICON 28480 1854 0071 TRANSISTORISILICON NPN 2N3391 89473 1901 0026 DIODEISILICON 200 PIV 0 5 AMP 28480 1901 0028 DIODEISILICON 400 PIV 0 5 AMP 28480 1901 0040 DIOCEISILICON 30 MA AT 1v 30 PIV 28480 1901 0045 SEMICON DEVICE DI1ODE SILICON 28480 1902 0031 DIODE BREAKDOWN 12 7 5 Mw 28480 1902 0037 SEMICON DEVICE1DIODE 28480 1902 0057 SEMICON DEVICEIDIODE SILICON 28480 1910 0016 DIOCE GERMANIUM 100 0 85 28480 2100 1171 RtVAR WW 10 4 OHM 10 1 2W 28480 2100 1172 RIVAR 5K OHM 10 O 2W 28480 2100 1776 RiVAR WW 10K OHM 10 LIN 1 2W 28480 2100 1777 RiVAR WW 20 OHM 10 LIN 1 2W 28480 2110 0110 FUSEICARTRIDGE SLO BLO O 1A 28480 2140 0018 LAMPIGLOW 1 108 24455 3101 0033 SWITCHISLIOE DPDT 115 230V 79727 3101 0206 SWITCHISLIDE LINE 28480 3101 0244 SWITCHISLIDE INT EXT 056 28480 7120 0445 NAMEPLATE 1100 200V 28480 8120 0078 CABLE ASSYIPOWER CORD 28480 9106 0729 INDUCTORIFXO 100 UH 10 28480 04255 6604 RIFXD WW 10 OHM 0 18 26480 04260 1039 BRACKET 28480 04260 1038 FRONT PANEL 28480 04260 1049 SHORTING BAR FOR
57. 14 60 21 Model 4260 Section VI Table 6 1 Table 6 1 Reference Designation Index Deatgnation Stock No Description Noe A100 04260 7021 ASSY1RANGE AND FUNCTION SWITCH C101 0160 1548 6 22 UF 10 100 8 FACTORY SELECTED PARTETYPICAL VALUE GIVEN C108 0160 1161 CIFXD PAPER 2000 PF 10 600 0 FACTORY SELECTED PARTETYPICAL VALUE GIVEN C103 0121 0039 CIVAR CER B 50PF 350VDCW FACTORY SELECTED PART TYPICAL VALUE GIVEN C104 0121 0039 CIVAR CER 8 50 350V0CW C105 0160 1045 CER 4 0 25 PF 500 0 9 FACTORY SELECTED PARTITYPICAL VALUE GIVEN 8101 08250 8604 RIFXO WW 0 986 OHM 0 5 FACTORY SELECTED PARTITYPICAL VALUE GIVEN R102 04255 86048 RIFXD WW 10 OHM 0 1 R103 0698 1381 FLM 100 OHM 0 2 8104 0698 1380 RiFXD MET FLM 1K OHM 1 2W R105 0698 1268 RIFXO FLM LOK OHM 0 1 1 2 106 0698 1376 97K OHM 0 1 1748 R107 0698 1575 RIFXD MET FLM 3K OHM 1 1 46 R108 0698 1377 RIFXD FLM 970K OHM O LX 1 40 R109 0598 1374 FLM 3OK 1 1148 R110 0698 1800 RIFXD MET FLM 500 OHM 0 1 L 2W 2111 0698 4142 MET FLM 15 8 OHM 1 1 4W 5101 04260 7021 SWITCHIROTARY FOR 5192 PART OF 101 A200 05260 8702 ASSY POWER SUPPLY AND 2 OSC 201 0180 0967 CiFXD ELECT 500 UF 25VDCW C202 0180 0756 ELECT 20 UF 15004 C203 0180 0756 ELECT 20 UF 15VDCW C20
58. 20 Power 4 3 4 26 1 kHz 4 3 4 28 Reference Voltage 00 4 3 4 29 Introduction eerta annt 4 3 4 31 Reference Phase Circuits 4 8 4 34 Variable Phase Circuits 4 4 4 3 Phase Comparator 4 4 4 40 Miller integrator 4 4 4 42 Switch 0 4 4 02337 1 iii Table of Contents Model 4260 List of Tables TABLE OF CONTENTS THEORY OF OPERATION cont d TED 4 44 Detector Assembly A400 PE 4 45 Introduction 4 41 Error Signal 4 50 One Shot Multivibrator _ 4 53 Phase Detector TOME 4 51 Differential Amplifier and Miller Integrator 4 59 Variable Resistance Circuit 4 62 Differential Amplifier and Lamp Driver 4 64 Chassis Assembly A500 Fora nts 4 66 Decimal Point and Direction Indicator Lamp A600 gt MAINTENANCE Introduction TD Test Equipment Ferr ee ee s Instrument Cover Removal Assembly Identification Performance Check Troubleshooting Repair
59. 200CD normal operating condition 0 5 Oscilloscope Model 1404 1 3 02337 2 00000 37 Model 42604 Section II Paragraphs 2 1 to 2 10 SECTION INSTALLATION 2 1 INTRODUCTION 2 2 This section of the manual contains informa tion for unpacking inspection repackaging storage and installation of the Model 42604 2 3 UNPACKING AND INSPECTION 2 4 H the shipping carton is damaged ask that the carrler sagent be present whenthe instrument 18 un packed Inspect the instrument for damage scratches dents broken knobs etc If the instrument is dam aged or fails to meet specifications Performance Check Paragraph 5 9 notify the carrier and the nearest Hewlett Packard field office see list at back of this manual Retain the shipping carton and the padding material for the carrier s inspection The field office will arrange for the repair or replacement of your instrument without waiting for the claim against the carrier to be settled 2 5 STORAGE AND SHIPMENT 2 6 PACKAGING To protect valuable electronic equipment during storage or shipment always use the best packaging methods available Your Hewlett Packard field office can provide packing material such as that used for original factory packaging Contract packaging companies in many cities can provide de pendable custom packaging on short notice Here are two recommended packaging methods a RUBBERIZED HAIR Cover painted surfaces o
60. 3 36 MEASUREMENT PROCEDURE a Perform the turn on procedure outlined in Para graph 3 3 b Check to insure that the 3 DQ RESISTOR and BIAS terminalpairs on the rear panel are shorted with their respective shorting straps c Rotate the SENSITIVITY control full ecw d Set FUNCTION switch to Ls AUTO position e Connect the inductor to be measured to the UN KNOWN terminals i Ifthe right direction indicator is lit rotate CRL control clockwise the left direction indicator is lit rotate CRL control counterclockwise Rotate SENSITIVITY control clockwise to give near full scale meter deflection g If the CRL control is fully cw and the right di rection indicator remains lit turn RANGE switch cw until left direction indicator lights Adjust CRL con trol for meter null and rotate SENSITIVITY control cw as null is approached h When null bridge baiance is achieved below 0100 on the CRL counter set RANGE switch to next position cew and rotate CRL control for null indica tion This is possible for all measurements above 100 H Inductance value is indicated the CRL counter 1 To measure Q for the unknown inductor set the FUNCTION switch to Ls LOW Q position 1 Adjust DQ control for minimum meter indica tion The CRL control can be adjusted slightly for best null k When a null indication is impossible in the Ls LOW Q position set FUNCTION switch to Lp HIGH Adjust DQ control for minimum meter ind
61. 4 0180 0965 ELECT 200 UF 25vDCw C205 0180 0756 ELECT 20 UF 15VDCW C205 0180 0964 ELECT 100 UF SOVDCW C207 0180 0981 CIFXO ELECT 22 UF 160VDCW C208 0180 1029 CiFXO TANT 1 UF 20 15VDCW C209 0160 1544 CIFXD MY 4700 PF 5 5OVOCW C210 0160 1544 CIFXQ MY 4700 PF 58 5OVDCW C211 0180 1026 CIFXD TANT 47 UF 20 6VyOCW C212 0180 1029 TANT 1 UF 20 15VDCW 0213 0180 0756 ELECT 20 UF I15VDCW C214 0180 0756 CiFXD ELECT 20 UF 15VDCW CR201 1901 0085 SEMICON DEVICEIDIOOE SILICON CR202 1901 0045 SEMICON DEVICE1DIODE SILICON CR203 1902 0031 DIOOEYGREAKDOWN 12 7V 5 400 MW cR204 1901 0045 SEMICON DEVICEtDIODE SILICON 205 1902 0031 DICDEsBREAKDOWN 12 7V 5 400 CR206 1901 0026 DIQDEISILICON 200 PIV 0 5 CR207 1901 0028 DIODEISILICON 400 PIV 0 5 AMP Q201 1654 0003 TRANSISTORINPN SILICON 1205 0033 HEAT DISSIPATOR FOR Q201 3t See list of abbreviations in introduction to this section 02337 2 6 3 Section VI Table 6 1 Reference Designation 0202 2203 9204 6205 2206 0207 R201 R202 R203 R204 R205 R296 R207 R208 R209 R219 R211 R212 R213 R214 R215 R216 R217 R218 R219 R220 C301 C302 C303 C304 C305 306 307 0308 c309 0310 2313 0314 0315 6 4 1854 0071 1854 0071 1854 0071 1854 0071 1854 0071 1854 0071 0684 2721 0684 2721 0684 6821 0682 6815 0684 4721 0664 2231 0690 1821
62. 42 Willlams Boulevard Kenner 70062 Tel 504 721 6201 TWX 810 955 5524 MARYLAND 6707 Whitestone Road Baltimore 21207 Tel 301 944 5490 TWX 710 862 0850 P O Box 727 Twinbrook Station 20851 12303 Twintrook Parkway Rockville Tel 301 423 7560 TWX 710 828 9684 Tel 3035 771 3455 TWX 919 935 0705 CONNECTICUT 508 Tolland Street East Hartford 06108 Tel 203 289 9394 710 425 3416 111 East Avenue Norwalk 06851 Tel 203 453 1251 TWX 710 458 3750 DELAWARE 3941 Kennett Pike Wilmingtan 19807 Tel 302 655 6161 TWX 510 666 2214 CANADA BRITISH COLUMBIA Hewlett Packard Canada Ltd 2184 West Broadway 880 Lady Ellen Place Vancouver Ottawa 3 Tel 504 738 7520 Tel 513 722 4223 610 972 5050 TWX 810 582 1852 ONTARIO Hewlett Packard Ltd MASSACHUSETTS Middlesex Turnpike Burlington 01803 Tel 617 272 8000 TWX 710 332 0382 MICHIGAN 24315 Northwestern Highway SouthtiBld 48076 Tel 313 353 9100 TWX 810 232 1532 MIMNESOTA 2459 University Avenue St Paul 55114 Tel 612 645 7881 TWX 910 563 3734 MISSOURI 9208 Wyoming Place Kansas City 64114 Tel 816 333 2445 TW 910 771 2087 2812 South Brentwood Blyd St Louis 63144 Tel 314 644 0220 TWH 910 760 1670 NEW JERSEY Crystal Brook Prof Bide Route 35 Eatontown Tel 201 747 1060 391 Grand Avenue Englewood 07631 Tel 201 567 3933 TWX 710 991 9707
63. 480 28480 28480 28480 28480 26480 28480 28480 28480 28480 28480 28480 28480 CB 2715 2735 2744 CB 3015 CB 3025 CB 3045 CB 3315 CB 3625 0683 3645 CB 4715 CB 5135 CB 5625 CB 5635 6215 CB 6815 6825 CB 6835 7515 8215 CB 8225 8245 CB 1031 1041 0684 1231 0684 1521 CB 1531 CB 2231 CB 2721 CB 2741 CB 4721 CB 4731 5621 CB 6821 0684 6831 8221 EB 1541 GB 1821 0698 1268 0698 1373 0698 1374 0698 1375 0698 1376 0698 1 0698 1320 0698 1581 0698 1400 0698 4142 0757 0926 0757 0328 0757 0950 0757 0955 0757 0939 0757 0941 See list of abbreviations in introduction to this section E NW MN D 1 3 6 3 2 1 5 i 3 ee HM MNE H tg deg 02337 2 Model 4260A Table 6 2 Replaceable Parts Cont d esovw C E 9 Stock Description 0757 0947 RIFXO FLM 9 1K OHM 2 1 BW 28480 0757 0951 RIFXD MET FLM 13K OHM 28 1 8W 28480 0757 0952 MET FLM 15K OHM 2 178W 28460 0757 0953 RIFXD FLM 16K OHM 2 1788 28480 0757 0955 RiFXD FLM 20K OHM 28 1 8 28480 0757 0959 RtFXD FLM 30K OHM 2 1788 28480 0757 0960 RIFXD 334 OHM 28 l1 BW 28480 0757 0968 RIFXD FLM 68K OHM 28 1 8 28480 1120 0734 METERISO UA 28480 1140 0050 COUNTERICRL 26480 1205 0055 HEAT DISSIPATOR FOR 9201 28480
64. 757 0284 met flm 100 0 1 4 1 2W 0151 1012 carb flm 33 0 1 1 29 0727 0965 carb fim 300 1 1 2W 0727 0991 ww 9 ohms 1 295 1 2W 0811 0294 carb flm 7 5 0 1 1 2W 0727 0705 ww LIQ 1 255 1 2W 0811 0284 DC Null Voltmeter HP 413A Range 1 mV to 300 Vrms Input R 1 megohm Voltmeter HP 403B Range 1 mV to 10 V Input Impedance 1 megohm 52451 with HP 52614 Piug In Electronic Counter Sensitivity 50 mV Freq Dc to 100 kHz Display 4 digits minimum 5 1 Section V Table 5 2 Model 4260 Tahle 5 2 Performance Checks 1 CAPACITANCE MEASUREMENT C Range 1 pf to 1000 uF C Accuracy 1 1 digit 1 nF to 100 uF D Range 0 001 to 0 12 for LOW D 0 05 to 50 for HIGH D D Accuracy LOW D 0 5 0 002 or 1 dial division whichever is greater HIGH D 1 D 5 0 05 or 1 dial division of LOW Q dial wl chever is greater a Connect equipment s shown in Figure 5 1 HP4260A REAR PANEL Figure 5 1 b For this check locate the following components Standard Connect Resistor Function Capacitor for Standard D uF Cs series 7 5 2 series 30 series 150 0 parallel 30K 2 parallel 15K 2 parallel 3K 2 parallel 1 5 K parallel 300 2 parallel 33 0 0989 098 9 098 9 098 9 098 9 098 9 088 5 098 9 098 9 098 9 098 9 08 89 0919 0097 0009
65. 861 4081 0 Box 22813 4242 Richmond Avenue Houston 77027 Tel 713 667 2407 510 881 2645 GOVERNMENT CONTRACT OFFICE 225 Billy Mitchell Read San Antonio 78226 Tel 512 434 4171 910 871 1170 UTAM 2880 South Maln Street Salt Lake City 84115 Tel 801 486 8166 TWX 910 925 5681 VIRGINIA Box 6514 2111 Spencer Road Riehmand 23230 Tel 703 282 5451 TWX 710 956 0157 WASHINGTON 11656 Eighth Street Belleyue 98004 Tel 205 454 3971 TWX 910 443 2303 FOR AREAS MOT LISTED CONTACT Hewlett Packard 1501 Page Mill Road Palo Alto California 94304 Tel 415 326 7000 910 373 1267 Telex 34 8451 FOR AREAS MOT LISTED CONTACT Hewlett Packard Inter Americas 1501 Page Mil Road Palo Alta California 94394 Tel 415 326 7000 TWX 910 373 1267 Teiax 034 8461 Cable HEWPACK Palo Alto VENEZUELA Cltec Edif Arisan Of 3 Avda Francisco de Miranda Apartado del Este 10934 Chacaito Tel 71 88 05 FOR AREAS NOT LISTED CONTACT Hewlett Packard Inter Amaricas 1501 Page Mil Road Alto California 84304 Tel 415 326 7000 TWX 910 373 1267 Telex 034 8461 Cable HEWPACK Palo Alto 12 66 8 or HmbH techaftliche Instrumente Hhardtgasse 6 3 ox 33 AFI 181 tPackard Benelux S A de 8 22 20 ARK isen ASS 1 hagen 48 00 Nb yv
66. AUTO position for measurements withthe internal 1 kHz generator Ad P just RANGE switch and CRL control for bridge bal ance meter null Read the measured C value on the CRL counter 3 57 L MEASUREMENTS WITH DC BIAS 8 58 GENERAL dcbias voltage 6 Vdc maximum can be applied to an unknown inductor during the L DETECTOR 46 2 we Te BIAS MAX 70 NOTE REAR PANEL 46 BIAS BATTERY J BIAS CAPACITOR Cpls JB DQ RESISTOR CsLp CURRIE Figure 3 5 Dc Biased Capacitance Measurement 02337 2 Section Paragraphs 3 56 to 3 59 measurement Figure 3 6 schematically illustrates the de bias application Operating procedure for dc biased measurements is described below and pic torially shown in Figure 3 6 The following equipment will be required 1 6 Vde battery or dry cell 2 electrolytic capacitor designated aluminum or tantalum 6 Vdew more than 100 HF at 1 kHz or more than 100 kHz f uf 3 de milliammeter VTVM not recommended or clip on milliammeter HP 428 4 electrolytic capacitor designated aluminum or tantalum 6 vdew more than 20 02 uF for less than 1 error measurements is the Q of the unknown L With the FUNCTION switch set to Lp HIGH Q the ca pacitance of Cr depends upon the unknown Q and de sired accuracy The error introduced by CL is C _ t measured L L 1 Tar measured Q Q 1 where
67. CON PNP 2306 1854 0071 TRANSISTOR SILICON NPN 2N3391 0307 1654 0071 TRANSISTORISILICON NPN 2N3391 4308 1854 0071 TRANSISTORISILICON NPN 23391 9309 1854 0071 TRANSISTORISILICON NPN 213391 9310 1854 0071 TRANSISTORISILICON NPN 283391 0311 1854 0071 TRANSTSTORISILICON NPN 2N3391 0312 1854 0071 TRANSISTOR SILICON NPN 2522391 9513 1854 0071 TRANSISTORISILICON NPN 2N3391 850 0684 1231 RIFXO COMP 12K OHM 10 1 48 R302 0683 7515 RtFXD COMP 750 OHM 5 174w R303 0757 0968 RiFXD MET FLM 68K OHM 26 1 88 R304 0684 4731 RIFXO COMP 47K OHM 10 1 0W 8305 0757 0951 R FXD 15K OHM 2 1 68 R305 0683 5645 REFXO COMP 5600 OHM 5 1 48 R307 0683 1225 RIFXD COMP 1200 OFM 5 1 48 R308 0683 5625 COMP 5600 OMM 5 1 4 R309 0683 2035 COMP 20K OHM 5 17408 R310 0757 0928 1 5 OHM 2 1 8W R311 0757 0928 RtFXD MET FLM 145K OHM 2 1 8W R312 0685 5155 REFXO COMP 51K GHM 5 174w R343 0757 0926 RIFXD MET FLM 1 2K OHM 2 1 8W R314 0683 5525 COMP 5600 OHM 5 1 W 8315 0757 0926 MET FLM 1 2 OHM 2 1 8W R316 0684 4731 RIFXD COMP 47K OHM 108 Led R317 0757 0951 MET 12 OHM 2 1 8W 2318 0683 7515 RIFXD COMP 750 OMM 5 l uW R319 0757 0968 RIFXQ FLM 68K OFM 2 1 8 R320 0684 1231 COMP 12 OHM 10 isiw 2321 0684 2251 COMP 22 OMM 10 1 4W R322 0684 6821 COMP 6800 OHM 10 174W R323 0684 6821 COMP 6800 OHM 10 174W R324 0684 2721
68. CUIT NEON LAMP DRIVER E DETECTOR DIFFERENTIAL AMPLIFIER MILLER INTEGRATOR ONE SHOT SWITCHING MULTIVIBRATOR C4260 D REFERENCE GENERATOR Figure 8 2 Overall Block Diagram 8 3 Section VIII Model 4260A Figure 8 3 8 4 02337 2 Model 4260A 3 i 2 ik WA 124 8 41 emere wegen a 02337 2 AARO See 17 3 2 RANGE AND FUNCTION SW cigs FROM FROM 0 FROM 2005 RIOI II 5101 102 601 605 FROM A200 K c FROM 2 9 R3 soi BLK gt r FROM _ 83 97 TRON 7 WHT SRN I FROM WHT GRN BLU WHT ORN GRN 29 4 1 INT 32 SIOZN SIO2PI 51020 tM WHT BLK c pen O 24F 2 2 i 4 Bas 5 CAPACITOR 1 WHT BLK YEL R4B 2 WHT GLK GRN 7 ti 4 n DG RESISTOR i CsLp i WHT GRN GY COPYRIGHT 1966 BY HEWLETT PACK uu Section V MTCH ASSEMBLY 04260 7021 Figure 8 Pe EN WHT YEL e GY 1500 WHT YEL on 5000 i i 50 0
69. E 8 4 IkHz OSCILLATOR SEE PAGE 542 FOR MEASUREMENT PROCEDURE 02337 2 04260 1 A300 REFERENCE VOLTAGE ASSEMBLY 04260 8703 FROM WHT HIGH IMPEDANCE DIFFERENTIAL LIMIT ING power 1 lt 12y AMPLIFIER NO AMPLIFIER AMPLIFIER A200 F FROM WHT POWER ORN SUPPLY BV 200 0 o l 22K R320 i 1855 0010 310 INPUT FROM 5 SWITCH C307 OO 241 Q 303 1854 0011 1854 0071 Q 502 1853 0010 INPUT FROM 9309 SWITCH WHT 1854 0071 Q 308 1854 0071 Aloo I I HIGH IMPEDANCE LIMITING AMPLIFIER 2 AMPLIFIER NO 2 Section VIII Figure 8 5 60 970 LIMITING MILLER SWITCHING PLIFIER 01 INTEGRATOR CIRCUIT 7 OUTPUT TO 5 DETECTOR ASSY A400 12 NOTES 1 UNLESS OTHERWISE INDICATED RESISTANCE iN OHMS CAPACITANCE IN PICOFARADS 2 ASTERISK 26 INDICATES SELECTED COMPONENT AVERAGE VALUES SHOWN 9313 1854 0071 R336 1340 2800 2 2400 R339 1 1 I 3600 REFERENCE DESISNATIONS 301 39 CR30I 308 930 R 36i 345 1854 0071 1854 0071 R333 4700 1338 3000 PHASE COMPARATOR COPYRIGHT 1986 BY HEWLETT PACKARD COMPANY 04280 0 4 Figure 8 5 Reference Voltage Assembly A300 8 9
70. ECTOR CIRCUIT Waveforms shown in Figure 8 6 for test points 17 and 18 indicate normal operation The difference betweendc voltages at test points 19 and 20 19 and 21 is less than 10 millivolts These voltages must be measured using a dc voltmeter with an input impedance greater than 10 megohms 5 49 ERROR SIGNAL AMPLIFIER CIRCUIT Wave forms for test points 22 and 23 are shown in Figure 8 5 The changes at these test points when the CRL control is increased or decreased 0 2 from bridge balance point are shown 22 b and 23a b These waveforms indicate that error signal amplifier gain 1s normal and phase relationship is correct 5 50 VARIABLE RESISTANCE CIRCUIT Connect resistance network as shown in Figure 5 6 De volt age at test point 24 should be between 5 3 and 6 1 volts Dc voltage or waveform changes at test points 25 through 30 are shown in Figure 8 6 for aCRL con trol change of 0 2 0 2 from bridge balance point 5 51 NEON LAMP DRIVER Dc voltage changes at test points 32 and 33 are shown in Figure 8 6 for a CRL control change of 0 2 0 2 from bridge balance point TO Je T 5 LAW 410 5100 5 Vew TO 9415 Figure 5 6 Resistance Network for Checks 02337 1 Model 4260 Seetion V Figure 5 7 B SaL Auth 7 T HR ML R5A RSE Figure 5 7 Top and Bottom Internal Component Location 02337 2 5 13 5 14 c A
71. EF VOLTAGE ee SES Leo 300 15 FROM 5 SWITCH WET R457 YEL IBOK TO CRL QWHT ORN 8LU 240K LIGHTS 4600 5 820 7A FROM SPLY 2200 WHT bun lt ONE SHOT MULTIVIBRATO 1 7024 a Section VIII Figure 8 6 NOTES 1 UNLESS OTHERWISE INDICATED o 3 I RESISTANCE IN OHMS 8418 249 I CAPACITANCE IN PICOFARADS aa CR408 INDUCTANCE IN MICROHENRIES 2 ASTERISK X INDICATES SELECTED COMPONENT AVERAGE VALUES SHOWN ud 2 WHT SWITCH 4000 15 BRN ORN 0415 vr cR409 Sour R49 Call CR406 cCR4O7 830 WHT rece BRN LEXT Pint R436 4300 ULTIVIBRATOR NEON LAMP DRIVER DIFFERENTIAL AMPLIFIER 1S GETECTOR BLK R440 4300 CR4I5 REFERENCE DESIGNATIONS l Rast 4300 401 422 401 42 L 401 5 401 418 R 401 458 t 8 WHT Ezr O RN L EXT I gt TO RANGE SWITCH WHT Lr 100 29 GRN LINT BLU 8454 SN 5600 100K 1 9418 19 CH COPYAIGHT 1966 BY HEWLETT PACKARD COMPANY 1854 00282 0417 04880 0 3 1854 0071 1854 0011 84555 0416 2200 2453 1054 0071 2RHF 2v TO CRL LIGHTS 600 6 Figure 8 6 D
72. FXD RIFXD R FXD R FXD RIFXD RIFXD RIFXO RtFxO COMP 100K OHM 5 70W COMP 120 OHM 58 1 748 COMP 1200 OHM 55 1748 COMP 12K OHM 58 1759 COMP 13K OHM 174W COMP 180K OHM 58 1749 COMP 1 8 MEGCHM 5 1799 COMP 2000 OHM 53 1748 COMP 20K OHM 55 1744 COMP 2 2 OHM 58 1 08 COMP 2400 OHM 5 1 46 COMP 246K OHM 58 1 48 Mir Mir Part No 26460 28480 08062 08062 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 26480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 26460 28480 28480 26480 28480 28480 28480 28480 28480 28480 28480 01121 01121 01121 01121 01121 01121 01121 01121 01121 91121 01121 01121 0121 0039 0121 0205 RDMI5F111J3C 5 470 50 0160 1031 0150 1039 0160 1045 9160 1161 0160 1227 9160 1271 0160 1510 0160 1515 0160 1580 0160 1542 9160 1543 0160 1544 0160 1545 0100 1588 0180 0708 0180 0756 0180 0773 0180 0945 0180 0962 0180 0964 0180 0965 0180 0966 0180 0967 0180 0378 0180 0981 0180 1025 0180 1026 0180 1029 0180 1032 0570 0050 0370 0077 0370 0256 9270 0267 0370 0272 0370 0275 CB 1045 CB 1215 1225 CB 1255 1335 CB 1845 CB 1855 2025 CB 2035 GB 2225 ca 2425 CB 2445 See list of abbreviations In Introduction to this section Section VI Table 6 2 eee ded p dem dom
73. Inc Tube Divisign Renwell Indugtimes Ine Swrteheralt Inc Chicago Wetals Controls Inc Spencer Products Philtips Advance Co Reseaith Produtis Corp Rattan Cg Int Vector Elactiome Co Waster Washar Mig Ce Las Angeles Cali Fastener Co Cambridge Mass New Hampshire Gall Bearing Int Palarharaugh N H Aillebore Masa Joliet 11 Madison 15 Woodstock N Y Glendale Cali General instrument Coip Ow Dallingion 5 8 ITT Hue and Cable Div Los Angales Vector Carp Speingtield M J Bandi Corn Red Div Red Bank Hubbel Mundelein Herran Ine Brooklyn Cental Co Chicago III Wire and Cable Div of Amaiace Gap Burreugns Corp Electronic Tubs Div Evaleady National Carbon Div Unian Carbide Corp Model Eng and Mig Inc Brouktield Mays NJ New York Hunlinglan Ind 10115 41 Revised May 1353 Code 83821 MIN 84396 85454 aspen 3531 88523 ETT 312 6 81473 81684 87931 83140 58230 88421 83231 858413 83885 92179 9090 91260 5135 91418 5526 31537 91562 51821 91429 91961 92180 32367 51196 34601 83177 Optical o Inc Table 6
74. LICON NPN 243591 9414 1854 0071 TRANSISTORISILICON NPN 2N3391 0415 1854 0005 TRANSISTOR INPN SILICON 0416 1854 0071 TRANSISTOR SILICON NPN 243551 9417 1854 0071 TRANSISTORS SILICON NPN 213391 1854 0022 TRANSISTORINPN SILICON 8401 0683 1855 COMP 1 8 MEGOHM 58 174W Ruo2 0682 2735 COMM 27K OHM 5 1 4W RHOS 0683 1235 RIFXD COMP 12K OHM 58 1 4W 56404 0683 4715 RIFXD COMP 470 OHM 55 1 48 2405 0688 2231 RiFXD COMP 22K OMM 10 174W 2406 0684 1041 RIFXD COMP 100K OHM 108 1 48 2407 0684 8221 AIFXO COMP 8200 OHM 10 1 uW R408 0684 1531 COMP 15K OHM 10 1 48 8409 0683 1085 RIFXD COMP LOOK OHM 58 174W RULO 0683 3045 RIFXD COMP 300K OHM 58 174W ROLL 0684 1031 COMP 10K OHM 10 1708 8418 0684 8221 RIFXD COMM 6200 OMM 108 1748 2413 0757 0952 RIFXO FLM 15K OHM 2 1 8W 2414 0757 0955 RIFXD FLM 20K OHM 2 1 8W R415 0683 5635 D COMP 55K CHM 5 1 4W FACTORY SELECTED PART4 TYPICAL YALUE GIVEN Rui6 0757 0947 RIFXD 9 1K OHM 2 1 8W 8417 0683 1045 RIFXD COMP 100K OHM 5 174W FACTORY SELECTEO PARTITYPICAL VALUE GIVEN 8418 0683 2715 COMP 270 OHM 58 174W 0683 3315 RIFXD COMP 330 OHM 5 L uW See list of abbreviations in Introduction to this section 02337 1 8 7 Section VI Model 4260A Table 6 1 Table 8 1 Reference Designation Index Cont d Designation amp Stock No Description Note Ru20 0757 9953 RiFXD FLM 16K
75. M 100 OHM CHASSIS ASSY INCL 52441 44 CABLE TDIAL SPRINGIDIAL CABLE TRANSFORMER 1POWER TRANSFORMER 1056 R FXD ww 0 986 OHM 0 35 ASSY POWER SUPPLY AND 1KHZ 056 ASSY REFERENCE VOLTAGE Cont d Stock No Description Mir Mir Part No 28480 28480 28480 28480 28480 28480 28480 28480 28480 28460 28480 28480 28480 28480 28480 28480 28480 28880 28480 28480 28480 28480 04260 5021 04260 56022 04260 5028 04260 8024 04260 5027 04260 5030 04260 5099 08260 7021 04260 7024 04260 7025 94260 70026 04260 7628 04260 7027 04260 7031 04260 7032 04260 8542 04260 8541 04260 8602 04260 8603 04260 8604 04260 8702 04260 8705 See list of abbreviations in Introduction to this section Model 4260A Meee er wht dmm ee eee 02337 2 the bottom af each page Alphabetical codes havo been arbitrarily assigned to tuppli rs not appearing in the H4 handbook Address Philadelphia 40118 Electroneg Wount Springa 01133 Westinghouse Elactic Carp 21236 Eaatutona Ine Chitapa Ill 332 3 Sage Electronicg Rochester Eleetiamc Tube Div D39334 Bumidial Collen Calit Mua 10373 Garlock Ing 1113 Cunch Graphik Go Electronics Pragucis Div 01558 Cor Hew York B Y 72928 Guoeran Co Ela NY 2112 Fansieel Metalluegical Corp No CHicago
76. MP 2700 OHM 10 1 4 R452 0684 1041 RIFXD COMP JOOK OMM 108 1 4W 8453 0683 6835 RiFXD COMP OHM 58 1 4W Ruse 0683 5625 RIFXD COMP 5400 OHM 58 174W Russ 0683 2225 RIFXD COMP 2 2 OHM 5 1 uw FACTORY SELECTED PARTITYPICAL VALUE GIVER 456 0683 2445 RiFXD COMP 240K OHM 5 1 48 8457 0683 1845 RIFXO COMP 180K OHM 58 17i R458 0683 8245 R3FXO COMP B20K OHM 5 1748 Ou260 TO25 CHASSIS ASSYiINCLIS2 J J 115 230V ONLY FACTORY SELECTED PART TYPICAL VALUE GIVEN See list of abbreviations in introduction to thia section 6 8 n2337 2 Model 4260A Section VI Table 6 1 Table 6 1 Reference Designation Index Cont d Mond Domim A600 0 260 7026 ASSY 0ECIMAL POINT AND DIRECTION IND R60I 0687 1541 RIFXD COMP 150K OMM 108 1 2W voor 2140 0018 LAMPIGLOW 1 10 2140 0018 LAMPIGLOW 1 109 v603 2140 0018 LAMPiGLOW 1 108 2140 0018 LAMPiGLOW 1 108 605 2140 0018 LAMPiGLOW 1 10W 0160 1540 CIFXD MICA 0 2 UF 0 28 c2 0160 1515 MICA 2200 108 SOOVDCW FACTORY SELECTED PARTITYPICAL VALUE GIVEN 0121 0205 CIVAR CER 5 PF 250VDCW 0160 1031 CtFXD CER 10 10 500VDCW FACTORY SELECTED PART TYPICAL VALUE GIVER cs 0160 1510 MICA 1200 10 5QOVDCW 56 0160 1227 CIFXD METAL PAPER 05 UF 108 250VDCW 1910 0016 DIODETGERMANIUM 100 AT 0 85 1910 0016 DIODEIGERMANIUM 100 O 85V 6 F1 2110 0110 FUSEICAR
77. NOMP 3600 CHM 5 174W COMP 360K OHM 5 1 4W COMP 470 OHM 58 1 44 COMP 51K OMM 55 1 40 COMP 5600 OHM 5 1744 COMP 56K OHM 58 i aw COMP 620 OHM 5 1 48 COMP 680 OHM 5 1 4W COMP 6800 OHM 58 174W COMP OHM 58 1 48 COMP 750 OHM 5 1 9 COMP 820 OHM 58 179W COMP 8200 OHM 58 COMP 820 OHM 58 1749 COMP 10K OMM 10 1 48 COMP 100K OHM 108 1 4 COMP 12K OHM 10 1748 COMP 1500 OHM 10 174 COMP 15K OHM 10 1714 COMP 22K 108 174W COMP 2700 OHM 108 1748 COMP 270K OHM 108 4w COMP 4700 OHM 108 1 40 COMP COMP 47K OHM 10 1744 5 6K OHM 108 6800 OHM 10 1748 68K OHM 10K 1 48 COMP 8200 OHM 108 1 48 COMP 150K OHM 108 1 24 COMP 1800 OHM 10 1W MET DEPC MET MET MET MET MET MET MET MET MET MET MET MET MET FLM 10K OMM 0 18 172 1 OHM 5 1 28 FLM 30K OHM 1 1 4W FLM 3K OHM I 4W 97 OFM FLM 970 OHM 0 1 hn T FLM IK OHM 0 1 FLM 100 OHM 0 1 1 2W 500 OHM 0 1 1 2W FLM 15 8 OMM 1 4 FLM 1 2K OHM 28 178W FLM 1 OHM 28 1 8W FLM 1 8K OHM 28 1 8 2 0K OFM 25 1 BW FLM 4 3K OHM 2 1 8W FLM 5 1K OHM 2 l1 B8W 01121 01121 01121 01121 01121 01121 01121 Q1121 28480 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 01121 26480 28480 01121 91121 01121 01121 01121 01121 01121 01121 28480 01121 01121 01121 28480 28480 28480 28
78. P 4100 412A or 413A see Paragraph 3 15 Current through the unknown resistor can be measured with a clip on milliammeter such as the HP 428B see Para graph 3 15 3 10 MEASUREMENTS 3 11 Resistance values between 100 ohms and 10 kilohms can be measured quickly with F accuracy using only front panel controls For measurements of values between 10 milliohms and 100 ohms or be tween 10 kilohms and 10 megohms an external null meter such as the HP 413A is desirable for better sensitivity during the measurements These twotypes of measurements are outlined as separate procedures in the following paragraphs 3 12 100 OHM to 10 OHM MEASUREMENTS a Perform theturn on procedure outlined in Para graph 3 3 b Set FUNCTION switch to R position c Connect the resistor to be measured to the UN KNOWN terminais d Set RANGE switchior meter indication near cen ter and increase meter sensitivity by rotating SENSI TIVITY controlclockwise If meter indication is right of center turn CRL control cew If left turn CRL control cw Adjust CRL control for meter center indi cation while increasing SENSITIVITY control to maxi mum sensitivity full cw 3 1 Section III Figure 3 1 LINE Switch Null Meter Numerical Counter DQ Control FRONT PANEL applies ac line voltage to instrument SENSITIVITY controls meter sensitivity for max RANGE switch selects measurement range Mech anic
79. QDEIGERMANIUM 100 0 857 60PIV DIODETGERMANIUM 100 0 85 60PIV DIOGDEFtGERMANIUM 100MA AT O 85V 60PIV See list of abbrevictions in introduction to this section 02337 1 Model 4260A Section VI Table 6 1 Table 6 1 Reference Designation Index Cont d Description 1910 0016 DIQDESGERMANIUM 100 AT O4 85V GOPIV CRS 14 1910 0016 DIODEIGERMANIUM 100 AT 0 85 amp OPIV 28415 1910 0016 DIODESGERMANIUM LOOMA 0 85V GOPIV 16 1901 0040 DIODE SILICON 30 1V 30 PIV 8417 1901 0040 DIODEISILICON 30 MA AT 30 PIV 18 1901 0040 DIODESSILICON 30 1V 30 PIV 68419 1901 0040 DIODE SILICON 30 AT 1V 30 28420 1901 0040 DIODEISILICON 30 30 PIV CRA21 1902 0057 SEMICON DEVICEI DIODE SILICON LuO1 9100 0729 INDUCTORsEXC 100 UH 10 2401 1854 0071 TRANSISTORISILICON NPN 2 5391 2402 1853 0010 TRANSISTORISILICON PNP Quos 1854 0071 TRANSISTORISILICON NPN 2N3391 Quos 1854 0071 TRANSISTORISILICON NPN 2N3391 4405 1854 0071 515 081511 100 NPN 283391 2406 1854 0071 TRANSISTORISILICON NPN 283391 040 1854 0071 TRANSISTORISILICON NPN 283391 Quos 1854 0071 TRANSISTOR iSILICON NPN 283391 2509 1854 0071 TRANSISTORISILICON NPN 2N3391 8419 1854 0071 TRANSISTORISILICON NPN 243391 2411 1854 0071 TRANSISTORISILICON NPN 2N3391 0412 1854 0071 TRANSISTOR SILICON NPN 2N3391 0443 1854 0071 TRANSISTORISI
80. R456 With the CRL control too high Q418 is off Q418 is on and left CRL light V60 is energized through R451 Q418 and R455 Figure 4 2 CRL Light Control 4 5 Section IV Paragraphs 4 64 to 4 67 4 64 CHASSIS ASSEMBLY A500 4 65 Chassis assembly A500 consists of the main mounting plate top deck and rear panel and those parts that are permanently riveted on it These parts are identified as 41 ac power input jack 18 pin connector for printed circuit assembly A200 J3 15 pin connector for printed circuit assembly A300 J4 15 pin connector for printed circuit assembly A400 and 82 115 230 volt ac power slide switch Model 4260A 4 66 DECIMAL POINT AND DIRECTION INDICATOR LAMP A600 Schematic Diagram Figure 8 3 4 67 This assembly includes decimal point neons V603 V604 V605 series resistor R601 and CRL direction neons V601 V602 Decimal point lights are controlled by the position of the RANGE and FUNC TION switches CRL direction light control is ex plained in Paragraph 4 63 02337 1 Model 4260 Section V Paragraphs 5 1 ta 5 10 SECTION V MAINTENANCE 5 1 INTRODUCTION 5 2 This section provides maintenance and adjust ment information for the Model 42604 The section contains four areas of information as follows a performance checks are included in Table 5 2 to verify operation of instrument circuits b troubleshooting and repair information is in tended to aid syste
81. TRIDGE SLO BLO 041 41 1251 0148 CONNECTORTPONER 3 PIN MALE 42 1251 0141 CONNECTOR t 18 C ONTACT 43 1251 0135 CONNECTORIFRINTED CIRCUIT 15 CONTACTS J 1251 0135 CONNECTORIPRINTEO CIRCUIT 15 CONTACTS 45 CONNECTOR INCLUDES1 1510 0011 BINDING POSTIBLACK 2 USED 04260 5021 INSULATORt2 EACH 04260 5022 INSULATORI2 EACH J 04260 5028 CONNECTORIFOR BIAS BATTERY 04260 1049 SHORTING BAR FOR J6 J 04260 5025 CONNECTORIFOR EXT RESISTOR CPrLS AND BIAS CAPACITOR 04260 1049 SHORTING BAR FOR J7 JB 04260 5028 CONNECTORIFOR EXT RESISTOR CSSLP 94260 10489 SHORTING BAR FOR 4 04260 5028 CONNECTORIFOR EXT OSCILLATOR J10 04260 5028 CONNECTORIFOR DETECTOR Mi 1120 0734 50 UA R1 2100 1172 RIVAR 5 OHM 10 0 39 R2 0684 1521 RIFXD COMP 1500 OHM 10 1748 R3 04260 7028 RIVAR WW SK OHM R4 2100 1171 RIVAR Ww 10 4 OHM 10 l 2W RS 04260 7031 02331 8 RIVAR WW 16K OHM 4100 OHM REPLACE ONLY WITH DQ DIA FACTORY SELECTED PARTSTYPICAL VALUE GIVEN 3t See list o abbreviations in Introduction to this section Section VI Table 6 1 Reference Designation 0698 1573 R7 0684 1041 51 3101 0206 52 5101 0033 53 5101 0244 04260 8602 T2 04260 8603 Wl B120 0078 xF1 1400 0084 04260 1041 1410 0033 04260 4542 1140 0030 08260 7027 04260 50509 0370 0050 0270 0275 0370 0272 0270 0267 0370 0077 0370 0077 0370 0256 04260 5024 04260 5099 04260 8541 04260 5027 1251 0048 04260 7032
82. a Use an external voltmeter such as the HP 413A DC Null Voltmeter for maximum resolution of the bridge balance point Remove the shorting strap on the Voltmeter rear panel to isolate the Voltmeter from power line ground Connect the Voltmeter low or ground input terminal to the 4260A rear panel DETECTOR ground terminal Connect the other Voltmeter input terminal to the UNKNOWN LOW ter minal on the 42604 b Set the FUNCTION switch to R Set RANGE switch full cw d Rotate CRL control to 1000 e Connect 10 megohm standard resistor to UNKNOWN terminals Adjust CRL control for null on voltmeter and increase SENSITIVITY control cw for maximum reso lution Read measured R value from CRL counter and decimal point displayed g Repeat the procedure for the other standard resistors 04337 2 5 3 Section V Model 42604 Table 5 2 Table 5 2 Performance Checks cont d h Remove resistor from UNKNOWN terminals With a short heavy piece of wire short UNKNOWN terminals Set RANGE switch full Measure residual resistance by adjusting CRL control for null indication on Voltmeter Residual resistance should be less than 1 digit standard Resistors Model 4260 Readings Resistor 10 0 5 1 4W metal film 09 79 10 21 M Resistor 1 M 2 0 5 1 4W metal film 0989 1011 K amp Resistor 100K 2 0 5 1 4W metal film 098 9 101 1K 2 Resistor 10K 2 0 5 1 4W metal film or WW 09 88 10 11 K 2 Resist
83. a srael Ltd 15 Kremenetskl Street Tel Aviv Tel 35021 2 3 48111 IRELAND Hewlett Packard Ltd 224 Bath Road Slough Bucks England Tel Siough 28406 9 29486 9 ITALY Hewlett Packard italiana Viale Lunigiana 45 Milan Tei 69 15 84 Hewlett Packard Malana S p A Palazza Italia Piazza Marconi 25 Rome Eur Tel 581 2544 NETHERLANDS Hewlett Packard Beneiux N V de Boelelaan 1043 Amsterdam 7 2 Tel 42 77 27 NORWAY Morgenstlerne amp Co A S Ingenigfirma 8 Wessels Gate Tel 20 16 35 JAPAN Yokogawa Hewlett Packard Ltd Shinhankyu Building No B Umeda Kita ku Qsaka Clty Tel 313 0091 Yokogawa Hewlett Packard Ltd Ito Buliding 59 Kotorl cho Nakamura ku Nagoya City Tel 551 0215 Yokgawa Hewlett Packard Ltd Ohashi Building 59 Yoyogi Shibuya ku Tokyo Tei 370 2281 KENYA j Tilbury Ltd P 0 Box 2754 Sulta 517 518 Hotel Ambassadeur Nalrobi Tel 25870 26803 68206 KOREA American Trading Co Ltd Seoul P 0 Box 1103 112 35 Sokong Dong Jung ku Segul Tek 3 7049 3 7613 ELECTRONIC INSTRUMENTATION SALES AND SERVICE EUROPE AFRICA ASIA AUSTRALIA PORTUGAL Telectra Rua Rodrigo da fonseca 103 0 2531 Lisbon 1 Tel 68 60 72 SPAIN Ataio Ingerieras Urge 258 Barcelona 11 Tal 230 69 88 Ingenieros Enrique Larreta 12 Madrid 16 Tel 235 43 44 SWEDEN HP Instrum
84. ally controls equivalent circuit and units displayed in window below meter and also pointer for DQ dial FUNCTION switch selects type of measurement Mechanically controls units value displayed in window below meter Changes decimal polnt placement in nu merical display indicates null at center scale R measurements meter deflects either left or right For C or L measurements meter deflects right only untii nulled UNKNOWN terminals connect component tobe meas ured between these two posts Connect directly or use very short leads CRL control adjusts bridge balance for meter null during measurements Mechanically connected to merical counter which indicates L or C measured value Direction lights just above control indicate ro tation direction for null on meter far Cp AUTO or Ls AUTO functions only Decimal Polnt Lights one of three lights selected by FUNCTION and RANGE switch positions indicates eor rect decimal point Light on indicates ac line voltage is applied to the instrument displays value of R L or C Mechanically driven by CRL control Range is from 0000 to 1030 outer black knob rotates DQ dial for D or Q measurements Hed center knob is a vernier does not rotate dial DQ scale is calibrated with vernier full counterclockwise Figure 3 1 11 BIAS BATTERY Terminals Model 4260A DQ Dial indicates Dissipation Factor D or Quality Factor Q Mechanically rotate
85. astrumant Corp Elizebeth N J Wegmold Div 0010 75487 Jamas Willan 10214 General Transistor Western Gorp 56209 Sprague lactic Co San Francisco Calif Los Angeles Calif 59446 inc Berkelay Calif 59730 Thomas amp Batts Gn Falls M Y 8074 Electrical Inst Co H J Maidan Mass Las Angeles Calif Laandia Crystal Lake Ill Berne ind 1775 Union Switch and Signa Div af 1 4 Miller Co vanin NY few York N Y 11088 The Bendis Corp Bandis Pacific Div THUS Metals Sma Francesco Calif New York 11242 Sete Electronics Carp Waltham Hiss Electric na 11312 Miceowave Electronics Corp Pale Alte Calif 84559 Western Electric Co lnt rte ati li Costa Msa talif 68092 Weston inst Div of ns 0406 Elmanrn Products Co 04222 Hef Division of 14251 Precision Paper Tuba Co 11534 duncan Electronics inc iad Division of Hewlelt Packard 04851 Sylvania Electic Producta Pain Alta Cali Microwave Devica Dav Mountain View 04719 Inr Semiconductor Pred Div Pn eno Arma 4732 Fitron Co Ine Western Diy Culver City 08773 Automate Electric tn 14796 Wire Co Precision
86. cedure for C measurements is 8 follows Set FUNCTION switch to Cp AUTO position b Connect capacitor to unknown terminals Turn the CRL control cw to 1080 d Rotate RANGE switch until crossover point of the indicator Lights is obtained Left indicator lights instead of right one and vice versa I you cannot obtain crossover see step e note e If left indicator lights adjust SENSITIVITY con trol for right deflection of the null meter pointer H the right indicator lights turn RANGE switch one step cew and adjust SENSITIVITY control for a right deflection of the null meter pointer Note if the right indicator stays lit regardless of the RANGE switch position the unknown value of the capacitor must be beyond the highest range the bridge gt 1000 the left indicator stays lit regardless the RANGE switch position the unknown value of the eapacitor must be below 1000 pF 1 Rotate the CRL control cew until a crossover of the indicator lights is obtained g Set SENSITIVITY full cw and adjust for null with CRL control h Read final capacitor value on the CRL counter and units display 4 25 VOLTAGE ACROSS UNKNOWN C 3 26 When voltage across the unknown C is to be measured a vacuum tube voltmeter such as an HP 4000 400H or 400L should be used The procedure 18 follows Make the capacitance measurement as outlined Paragraph 3 23 leave the inst
87. ciated compo nents form 1 kHz oscillator cireult Emitter fol lower Q207 provides the buffered 1 kHz output to transformer T2 to drive the bridge circuit for L and C measurements The oscillator is an RC type with positive feedback from Q206 collector to 9205 base to maintain oscillations Operating frequency is pri marily determined by C209 C210 R208 R209 and R210 Variable resistor R210 permits frequency ad justment R213 is the output level control Plus 13 Vde is supplied from pin D via OSCILLATOR INT EXT switch S3 to pin U Thus the oscillator circuit is energized only when 53 is set to INT Capacitors C208 and C214 filter 1 kHz from the 13 Vdc line 4 28 REFERENCE VOLTAGE ASSEMBLY A300 Schematie Diagram Figure 8 5 4 29 INTRODUCTION 4 30 The circuits of assembly A300 receive the 1 kHz signal from bridge transformer 2 and generate a negative output pulse The duration of this pulse is equal to twice the phase angle 8 between the bridge driving signal from 2 and the 1 kHz signal across one arm of the bridge circuit This 28 pulse duration thus represents a phase relationship in part of the bridge circuit and is used to detect the error signal component in phase with the reference voltage of the phase detector Detector output drives the voltage controlled resistor automatically for bridge balance This automatic action occurs when the FUNCTION switch is set to Cp AUTO or Ls AUTO The 28 re lationship is used
88. d P 0 Box 39 614 SukhumvIt Road Bangkok Tel 913450 1 2 FOR AREAS NOT LISTED CONTACT Hewlett Packard Export Marketing 1501 Page Mill Road Palo Alto California 04304 Tel 415 326 7000 Talex 034 8461 Cabie HEWPACK Palo Alto 12 66
89. d 2 reference voltage derived from the 1 kHz signal source The phase detector output voltage is therefore proportional to bridge unbalance This proportional voltage is applied through a dc am plifier tothe voltage controlled resistor circuit This controled value is the resistance of the one arm of the bridge As the CRL control is rotated to achieve bridge balance the voltage controlled resistor value electronically follows the CRL control Thus when bridge balance is achieved no error voltage is pres ent and the null meter indicates zero 4 8 In generating the reference signal input to the phase detector two voltages are applied to the ref erence phase comparator The comparator voltage output has a phase relationship 8 with respect to the driving signal The phase multiplier translates this relationship to 26 since 28 is the most 02337 1 tive angle for maximum sensitivity in the circuit This 20 information is applied to the reference volt age generator and a 1 kHz square wave results which is displaced in phase by 28 from the driving voltage The generated 28 reference signal is then applied to the phase detector for comparison with the bridge error voltage 4 9 BASIC BRIDGE FOR RESISTANCE MEASUREMENTS 4 10 Figure 4 1 shows the basic bridge circuit used to measure resistance four arm bridge cir cuit is formed by resistors Ra Rx Rs and Rb Rx is the fixed unknown R to be measured Ra is
90. d by DQ control Dial scales are LOW D 001 to 12 HIGH D 05 to 50 LOW Q 02 to 20 HIGH 8 to 1000 REAR PANEL AC LINE Connector cable connects to flat plug on power LINE Voltage Switch permits operation from either 115 Vac or 230 Vac LINE fuse 0 1 ampere provides overload protection OSCILLATOR INT EXT switch selects internal ogcil lator or external oscillator and contrels error signal amplifier frequency response For INT setting error signal amplifier 18 tuned to 1kHz for EXT amplifier response is flat between 20 Hz and 20 kHz External Oscillator Terminals connect external os to these terminals DETECTOR Output Terminals error signalamplifier output supplied to external tuned amplifier or oscillo scope DQ RESISTOR Cs Lp Terminals connect variable re sistor for special low frequency D Cs function Q Lp function measurements Terminals normally nected together with shorting strap DQ RESISTOR Cp Ls BIAS CAPACITOR Terminals Connect variable resistor for special low frequency D Cp function or Q Ls funetion measurements For or L measurements with de bias connect a capacitor Terminals normally connected together with shorting strap connect battery 6 Vde max for or L measurements with blas Termi nals normally shorted together with shorting strap Front and Rear Panel Controls Indicators and Connectors 02337 2 04260
91. deter mined by the value of Rx Rs is a fixed value and Rb is variable to adjust for bridge balance In actual use the Model 4260A bridge circuit is adjusted for a null indication on the meter with the CRL control and the unknown resistance is read directly from the display with correct units and decimal point placement 4 11 BASIC CIRCUITS FOR CAPACITANCE MEASUREMENTS 4 12 Figure 4 1B illustrates the basic bridge cir cuit for parallel capacitance Cp HIGH D measure mentsat 1kHz Figure 4 1C illustrates abasic bridge circuit for series capacitance Cs LOW D measure ments For parallel capacitance measurements with the FUNCTION control set to Cp AUTO the basic bridge circuit is shown in Figure 4 1D 4 13 BASIC CIRCUITS FOR INDUCTANCE MEASUREMENTS 4 14 Figure 4 1E illustrates the basic bridge circuit for series inductance LOW Q measurements at 1kHz Figure 4 1F illustrates the basic bridge circuit for parallel inductance HIGH Q measurements al 1 kHz For series inductance measurements with the FUNC TION switch set to Ls AUTO the basic bridge circuit is shown in Figure 4 1G 4 15 RANGE AND FUNCTION SWITCH A100 Schematic Diagram Figure 8 3 4 16 Assembly A100 consists of RANGE switch S101 FUNCTION switch 8102 and a printed circuit board for lead and component connections The RANGE and FUNCTION switches route signals in the instrument for proper operation RANGE switch 5101 selects the resistor which forms one
92. e and read measured L value Measured L value mH Inductance dif ference between measured L values in steps f and i should be within half digit Jf not within half a digit on the CRL counter the measured dc resistance of R102 should be 10 ohms 0 5 see Paragraph 5 37 step i 5 39 OPERATION CHECKS OF PRINTED CIRCUIT ASSEMBLIES 5 40 The following paragraphs outline operating checks for printed circuit assemblies 4200 A300 and 400 5 41 POWER SUPPLY AND 1 KHZ OSCILLATOR SEMBLY A200 5 42 POWER SUPPLY a With LINE switch ON connect dc voltmeter to J2 pin D test point 1 Voltmeter should indicate be tween 12 0 and 18 5 Vde b Connect dc voltmeter to J2 pin F test point 2 Voltmeter should indicate between 11 0 and 12 5 Vde e Connect dc voltmeter to J2 pin P test point 3 Voltmeter should indicate between 95 and 115 Vdc 58 43 1 kHz OSCILLATOR With LINE switch ON set rear panel oscillator Switch to INT b Connect oscilloscope to J2 pin T test point 4 Voltage level should be between 4 5 and 6 7 volts peak to peak Waveform is shown in Figure 8 4 c Connect electronic counter toJ2 Pin T Counted frequency should be between 995 and 1005 Hz 5 44 REFERENCE VOLTAGE ASSEMBLY A300 5 45 Operation checks of this assembly are best made by waveforms Test points 5 through 16 Fig ure 8 5 indicate waveforms for these circuitstobe used with the foliowing proced
93. e capacitor C1 connect the instruments as shown in Figure 5 5 fxd a Connect a standard 0 1 F capacitor such asthe YHP Model Cs 0 1 and a 16 ohm 5 1 4 watt resistor HP 0686 1605 in series across the UNKNOWN terminals The guard terminalof the standard capac itor should be connected to the rear panel ground terminal of the DETECTOR jack b Set FUNCTION switch to Cs LOW D c Sel RANGE switch to display XXX X nF d Set rear panel INT EXT switch to EXT and set oscillator to 1 kHz e Balance the bridge and read the measured C value C value should be standard value 0 3 for example 098 7 to 100 3 nF 5 32 C305 SELECTION Capacitor C305 compen satesfor amplifier stray input capacity and the capac ity of the CRL control The procedure for selecting ihe correct value for C305 is as follows a Connect the test setup as shown in Figure 5 5 b Connect a standard capacitor such as the YHP Model 5 0 1 uFand 16K ohm 5 1 4 watt resis tor in parallel to the UNKNOWN terminals Set FUNCTION switch to Cp HIGH D d Set RANGE switch for XXX X nF display 02337 2 Silvered Mica C 1000 picofarads xl YHP 8 1000 Standard 1 millihenry 0 1 General Radio 1482 E Range 10 ohms to 10K ohms Accuracy 1 fxd comp 16 ohms 15 5 1 2 W fxd comp t6K ohms 5 5 1 4 W comp 33 ohms 45 1 4 W fxd comp 160K ohms 455 1 4 W comp 330 ohms 50 1 4 W fxd comp 1 6 Meg
94. e used along with a capacitive voltage divider HP 110414 The proce dure is as follows 4 Make the inductance measurement as outlined in Paragraph 3 36 leave the instrument set up at null b Isolate the Voltmeterirom power line ground by using a two prong power cord adapter and leaving the adapter pigtail lead disconnected from ground c Connect the Voltmeter divider ground lead to the 4260 rear panel detector ground terminal d Connect the Voltmeter divider probe to the UN KNOWN terminal not the LOW terminal Read the voltage across the unknown L on the Voltmeter 3 40 INFLUENCE OF Q IN Ls AUTO MEASUREMENT 3 41 The accuracy specified for Ls AUTO measure ment is obtained when Q is more than 1 When Q is smaller than 1 accuracy of the Ls AUTO measure ment is reduced due to the of the variable resistance circuit of the AUTO NULL Typical data is shown in Figure 3 2 3 42 SPECIAL MEASUREMENTS 3 43 20 Hz TO 20 kHz MEASUREMENTS 3 44 Since the 42604 internal oscillator frequency is fixed at 1 kHz an external generator must be con nected ior measurements at irequencies between 20 Hz and 20 kHz For such measurements an audio oscillator with 600 ohms output impedance Hp 208 204B or 200CD and voltmeter HP 403B or 400D 400H 400L are recommended 3 45 If the presence of a non linear unknown causes appreciable distortion in the 4260A detector the best null indication ma
95. ed to capacitors such as electrolytic types during the C measurement Figure 3 5 schematically illustrates the de bias application Operating proce dure for dc biased measurements is described below and pictorially shown in Figure 3 5 The following equipment will be required 1 6 Vde battery or dry cell 2 electrolytic capacitor aluminum or tantalum des ignated Cy 6 more than 100 4 F at 1 kHz or more 100 kHz f dc voltmeter VTVM not required electrolytic capacitor aluminum or tantalum des ignated CL 6 Vdew more than 200 HF for less than 1 error measurements Dy is the D value of the unknown 02337 2 A 22 MN 42604 th the FUNCTION switch set to Cp HIGH D the ca itance of required depends upon the unknown D wd desiredaccuracy The error introduced by Cy is C M _ _ t 2 measured C C 1 T and measured D 1 D where Ct 0 2 uF and or Dy is the correct C or D value of the unknown 56 PROCEDURE amp Connect the measurement setup as shown in Fig ure 3 5 instrument cabinets except 42604 must be isolated from power line ground b Connect the unknown C to the UNKNOWN termi nals CAUTION The LOW UNKNOWN terminal is at de posi tive potential DO NOT APPLY A DC BIAS VOLTAGE GREATER THAN 6 VDC OR A DC BIAS CURRENT GREATER THAN 10 MILLIAMPERES Set FUNCTION switch to Cp
96. ent AB Hagakersgatan 7 M lndal Tel 031 27 68 pQ HP Instrument AB Centralv gen 28 Solna Tel 08 83 OH 30 LEBANON Constantin E Macridis Clemenceau Street Clemenceau Center Beirut Tel 220845 NEW ZEALAND Sample Electronics N Z 5 Ltd 8 Matipo Street Onehunga S E 5 Auckland Tel 667 356 PAKISTAN EAST Mushko amp Company Ltd Zirat Chambers 31 Jinnah Avenue Tel 80058 PAKISTAN WEST Mushko amp Company 4 Oosman Chambers Yictoria Road Karachi 3 Tel 51027 52927 SOUTH AFRICA F H Flanter amp Pty Ltd Rosella House Buitencingle Street Cape Town Tel 3 3817 Cable HEWPACKSA Geneva mm SWITZERLAND HEWPAK AG Zuricherstrasse 20 8952 Schlieren Zurich Tel 051 98 18 21 TURKEY Telekom Engineering Bureau Box 376 Galata Istanbul Tel 48 40 40 UNITED KINGDOM Hewlatt Packard Ltd 224 Bath Road Slaugh Bucks Tel Slough 28406 9 29485 9 YUGOSLAVIA Belram S A 83 avenue des Mimosas Brussels 15 Belgium Tel 35 28 5g FOR AREAS NOT LISTED CONTACT Hewlett Packard S A 54 Route des Acacias Geneva Switzerland Tel 022 42 81 50 Telex 2 24 86 F H Flanter 8 Co Pty Ltd 104 Pharmacy House BO Jorissen Street Braamfontein Johannesburg Tel 724 4172 TAIWAN Hwa Sheng Electronic Co Ltd P D Box 1558 21 Nanking West Road Taipel Tel 46076 45936 THAILAND The International Engineering Co Lt
97. etector ssembly A400 8 11 8 12 gt CRL LIGHTS A600 7 ELECTRONIC INSTRUMENTATION SALES AND SERVICE x UNITED STATES CANADA CENTRAL AND SOUTH AMERICA UNITED STATES ALABAMA FLORIDA P O Box 4207 Suite 106 2003 Byrd Spring Road S W 9999 N E 2nd Avenue Huntsville 35802 Miami Shares 33138 510 579 2204 Tel 308 758 3626 205 881 4581 810 848 7252 ARIZONA P Q Bax 20007 3009 North Scottsdale Road Herndon Station 32814 Scottsdale 85251 621 Commonwealth Avenue Tel r 6021 9157601 Tel 305 841 3970 TWH 810 850 0113 232 South Tucson Boulevard Tucson 85716 P O Box 8128 Tel 602 623 2564 Madeira Beach 33708 TWX 910 052 1162 410 150th Avenue St Petersburg CALIFORNIA Tel 813 381 0211 3939 Lankershim Boulevard 810 863 0355 Horth Hollywood 91804 Tel 213 872 1282 GEORGIA TWX 910 499 2170 3110 Maple Drive N E 1101 Embarcadero Road Atlanta 30305 Palo Afto 94303 Tel 404 233 1141 Tel 415 327 8500 TWX 810 751 3283 TWX 919 373 1280 ILLINOIS 2581 Carlsbad Avenue 3500 Howard Street Sacramento 95821 Skokie 60076 Tel 916 482 1463 Tel 312 677 0400 TWX 910 367 2092 TWX 510 223 3613 1055 Shatter Street INDIANA San Diego 32105 4002 Meadows Drive Tel 714 223 8103 Indianapolls 46205 TWX 910 335 2000 Tel 317 546 4891 COLORADO TWX 810 341 3253 7965 East Prentice LOUISIANA Englewood 80110 856 19
98. external oscillator can be connected as out lined in Paragraph 3 42 Special Measurements Di rection lights indicate the correct rotation direction Ls AUTO measurements The measured L value is displayed on the CRL counter with correct decimal point location units and equivalent circuit also dis played Quality factor Q can be measured after the bridge is balanced ior the inductance measurement The measured Q value is displayed on the DQ dial 3 32 RESIDUAL INDUCTANCE 3 33 Residual inductance of the UNKNOWN terminals can be measured with heavy short wire connected to these terminals ifs value is typically 1 uh or less When amp mall inductance measurements are made this residual inductance should be subtracted from the measured value Ifexternal leads are used to connect the unknown the residual inductance measurement should include the lead inductance Errors caused by residual and lead inductances are listed in Table 3 1 3 34 Ls AND Lp MEASUREMENT DIFFERENCES 3 35 The measured value of inductance depends on whether a series or parallel equivalent circuit is used for the measurement The relationship between a series inductance Ls circuit and a parallel inductance Lp circuit is as follows 3 5 Section III Paragrapha 3 38 to 3 45 _ 1 where Q is the measured Q value The difference be tween Ls and Lp is large when Q is smaller than 10 but Ls is within 1 of Lp if Q is 10 or greater
99. f instrument with protective wrapping paper Pack in strument securely in strong corrugated container 350 Ib sq in bursting test with 2 inch rubberized hair pads placed along all surfaces of the instrument In sert fillers between pads and container to ensure a snug fit Mark the Delicate Instrument and seal with strong tape or metal bands b EXCELSIOR Cover painted surfaces of instru ment with protective wrapping paper Pack instrument in strong corrugated container 350 10 84 in bursting test with a layer of excelsior about 6 inches thick packed firmly against all surfaces of the instrument Mark the box Delicate Instrument and seal with gtrong tape or metal bands 2 1 ENVIRONMENT Temperature during storage and shipment should be limited as follows a Minimum temperature 40 C 40 b Maximum temperature 475 C G167 F 2 8 The Model 4260 1s equipped with plastic feet and tilt stand for bench operation as shipped from the factory When the instrument is to be rack mounted combining Paragraph 2 9 or adapter frame Paragraph 2 10 is required These items avail 02337 1 able through your Hewlett Packard Sales Service office These two methods for rack mounting are outlined in the following paragraphs 2 9 COMBINING CASE The combining ease HP 1052A shown in Figure 2 2 is modular unit which accepts sub module units such as the 1 2 module Model 42604 The combining ca
100. gh emitter followers 0412 Q413 and Q414 When Q411 base voltage decreases current through R446 and R447 decreases base voltage levels of Q412 and Q413 increase and the forward current through CR419 CR420 increases This causes the effective resistance of the diodes to become smaller When Q411 input voltage causes Q411 to be cut off current begins to flow through CR416 CR417 and CR418 base voltage level of Q412 and 0413 cannot increase At this time diodes CR419 CR420 have the minimum resistance for the bridge arm When Q411 base voltage increases Q411 turns on and G411 collector to emitter voltage becomes small Diodes CR419 CR420 are cut off and their effective resist ance becomes several hundred megohms Thus the variable resistance circuit changes its resistance as controlled by bridge balance information from the phase detector 4 62 DIFFERENTIAL AMPLIFIER AND LAMP DRIVER 4 63 This circuit uses information from the phase detector circuit Paragraph 4 56 to light the cor rect CRL direction lamp Figure 4 2 is a simpli fied diagram of the light control circuit The error dc level at Q416 base is added with the reference level at Q417 base by the differential amplifier to give a resulting de level at driver 0418 base When the CRL control is set too low for bridge balance Q416 is turned on this causes 0418 to be off with its collec tor voltage rising to near 110 volts and right CRL light V602 is energized through
101. gh frequency compensation at the high re sistance end of R3 The R3 check at 500 ohms is an additional check to ensure that R3 resistance is correct a Connect test equipment setup as shown in Fig ure 5 5 b Connect the 0 01 uF silvered mica capacitor with 160K ohms 5 1 4 watt resistor in parallel to the UNKNOWN terminals c Set FUNCTION switch to Cp HIGH D 5 9 Section V Paragraphs 5 34 to 5 36 d Set RANGE switch for XXX X nF display e Set INT EXT switch on rear panel to EXT f Set Oscillator frequency to 1 kHz g Balance the bridge and read the measured C value MeasuredC h Disconnect parallel 160K resistor and connect a 330 ohm 5 1 4 watt resistor in parallel with the standard silvered mica capacitor i Change oscillator frequency to 20 kHz j Balance the bridge and read measured C value Measured C nF Capacitance difference between values obtained in steps g and j should be within a digit on the counter 5 34 C103 CHECK AND ADJUSTMENT Trimmer capacitor C103 is inside switch assembly A100 The adjustment can be done through the access hole in the switch assembly a Connect test equipment as shown in Figure 5 5 b Connect the 0 01 uF silvered mica capacitor with a parallel 160K ohms 5 1 4 watt resistor to the UNKNOWN terminals Set FUNCTION switch to Cp HIGH D d Set RANGE switch for XX XX nF display e Set oscillator INT EXT switch
102. he bridge Detector circuits include the error sig nal amplifier phase detector one shot multivibra tor differential amplifier Miller integrator vari able resistance circuit and CRL direction light control 4 47 ERROR SIGNAL AMPLIFIER 4 48 This B dB amplifier includes transistors 0401 through Q405 and associated components Input at pin 1 is a 1 kHz sine wave if internal oscillator is used otherwise frequency of external oscillator whose amp litude represents the amount of bridge unbalance error signal Sine wave outputs from Q404 drive part of the phase detector and also the meter circuit An output from Q405 emitter phase shifted 90 lead ing drives that part of the phase detector which con trols the direction indicator light circuit Thus when an unknown C is connected across the UNKNOWN terminals the bridge circuit is unbalanced and an error signal results This causes a meter reading a direction light to be on and also controlled value for the variable resistance 4 49 The error signal is applied at pin 1 and ampli fied by 0401 Q402 and 2403 Diodes CR402 through CR405 provide limiting at Q402 to obtain logarithmic amplifier characteristics Also when oscillator switch 53 is set to INT pins 6 and 7 shorted nega tive feedback occurs from Q404 emitter to Q403 base through a twin T filter The T filter provides mini mum negative feedback at 1 kHz which peaks the amplifier at this frequency a
103. he fol lowing procedure checks 1 chm resistor R101 inside the RANGE switch Connect test setup as shown in Figure 3 3 Lh Connect a standard mH inductor such as General Radio 1482 The inductor high terminal is connected tothe unmarked UNKNOWN terminal and the inductor low and guard terminals should be connected to the UNKNOWN LOW terminal The inductor case Should be isolated from ground Set FUNCTION switch to Ls LOW Q d Set RANGE switch for XXXX LH Set oscillator INT EXT switch to EXT and set oscillator frequency to 1 kHz f Balance the bridge and read the measured L Measured L value Install a 330 ohm 5 1 4 watt resistor in series between the inductor high terminal and the unmarked UNKNOWN h Set oscillator frequency to 20 kHz Balance the bridge and read measured L value Measured L value _ uH Inductance differ hence between L values obtained in steps f and i should tbe within 0005 uH not within 0005 measure the resistance between UNKNOWN LOW terminal and ter pminal 40 see Page 8 4 as follows 1 Remove instrument top bottom and right side covers Remove two screws in printed circuit hold down cover and liit off HP4260A FRONT HP 140 OSCILLOSCOPE 80 NOT GROUND CABINET Section V Paragraphs 5 37 to 5 38 2 Remove all three printed circuit assemblies 3 Set FUNCTION switch to L
104. ication The Q of the unknown indicator is read from the Q scale indicated by the red pointer in the DQ window 3 37 The fastest procedure for L measurements is as follows a Set FUNCTION switch to La AUTO position b Connect inductor to unknown terminals c Turn CRL control ew to 1030 d Rotate RANGE switch until a crossover point of the indicator lights is obtained Left indicator Lights instead of right one and vice versa you cannot obtain a crossover see step e note 3 6 Model 42604 e If the left indicator lights adjust SENSITIVITY control for right deflection of the null meter pointer If the right indicator lights turn RANGE switch one step cw and adjust SENSITIVITY control for right de flection of the null meter pointer Note if the right indicator stays lit regardless of the RANGE position the unknown value of the inductor must be beyond the highest range of the bridge gt 1000 If the left in dicator stays lit regardless of the RANGE position the unknown value of the inductor must be below 1000 microhenries f Rotate CRL control cew until a crossover of the indicator lights is obtained g Set SENSITIVITY full cw and adjust for null with the CRL control h Read final inductor value onthe counter and units display 3 38 VOLTAGE ACROSS UNKNOWN L 3 39 When voltage across the unknown L is to be measured vacuum tube voltmeter such as 400D 400H or 400L should b
105. ime delay CP cadmium plate MEG meg 108 PIV peak inverse voltage TGL toggle CRT cathode ray tube PNP positlve negative cw clockwise MET metal film sitive THD thread MET OX metallic oxide P O TI titanium deposited carbon MFR manufacturer POLY polystyrene TOL tolerance DR drive MINAT mintature PORC porcelain TRIM trimmer ELECT electrolytic Z momentary POS positionis TWT traveling wave tube ENCAP encapsulated MY POT potentiometer U micros 10 6 EXT external my PP peak to peak y farads N mano 10 9 PT Y flat head N C normally closed pwy peak working voltage YDCW de working volta FILH fillister head NE neon w with FXD fixed NIPL nickel plate RECT reetifiar w N O normally open RF radio frequency working inverge germanium NFO negative positive round head or voltage GL glass zaro temperature right hand ww wirewound GRD grounded coefficient RMO rack mount only w o without 01194 12 02337 1 6 1 Section VI Model 4260A Figure 6 1 ITEM NO DESCRIPTION HP STOCK NO La poems 0 3 x r we p mms 0 sene Ce p ome o om m T 225 em 3 mes Figure 6 1 Modular Cabinet Parts 6 2 0233 7 2
106. in 7 ranges Accuracy 1 1 Digit from 1 mH to 100 H GENERAL 2 2 1 Digit from 1 uH to 1000 H Residual inductance 5 1 uH POWER SUPPLY 115 or 230 volts 410 50 or 60 Hz approx 7 watts QUALITY FACTOR Range DIMENSIONS LOW Q Q of series L 0 02 to 20 HIGH Q Q of parallel L 8 to 1000 Pim rium Accuracy LOW Q Q of series L 5 0 05 or ONE DIAL DIVISION whichever is greater HIGH Q 1 Q of parallel L 5 0 002 FRONT or ONE DIAL DIVISION of LOW D dial whichever is greater L greater than 100 uH RESISTANCE MEASUR EMENT DIMENSIONS IN INCHES AND MILLIMETERS gun RESISTANCE Range 10 milliohms to 10 megohms in ranges Accuracy 1 1 Digit from 10 ohms to 1 megohm WEIGHT 2 1 Digit from 10 milliohms to 10 ohms Net 11 lbs 5 kg and 1 megohm to 10 megohms Shipping 15 lbs 6 8 kg Residual resistance 3 milliohms Resistance measurements at DC only ACCESSORY SUPPLIED 7ft power cable with MA plug ELECTRONIC AUTO NULL EQUIPMENT AVAILABLE Eliminates need for DQ adjustments in parallel C 18 pin printed circuit extender board 5060 2041 and series L measurements at 1 kHz 15 pin printed circuit extender board 5060 0049 Accuracy when D 1 Q 2 1 and CL measure DC Null Voltmeter HP Model 413A ments are made in 3 and 4 figures equals 20 Hz to 20 kHz Oscillator HP Model
107. inal HP200CD OSCILLATOR 4260 FRONT PANEL DO NOT GROUND CABINET Section III Paragraphs 3 46 3 47 Note Bridge null can be obtained using a tuned null detector with less than 90 dB gain con nected to the DETECTOR terminals The DETECTOR terminals are connected to the output of the internal pre amplifier For most accurate and sensitive measurements the method shown in Figure 3 3 is recommended d Set the 4260A INT EXT OSCILLATOR switch to EXT Set the FUNCTION switch to Cs LOW D or Cp HIGH D for capacitance measurements or to Ls LOW Q or Lp HIGH Q for inductance measurements f Connect the unknown component tothe UNKNOWN terminals g Adjust the SENSITIVITY control for near full scale deflection and set RANGE switch for minimum on meter h Adjust CRL and DQ controlsfor minimum meter indication SENSITIVITY control can be adjusted cw as bridge balance is approached i Read capacitance or inductance of the unknown on the CRL counter Correct decimal point units and equivalent circuit are also displayed The D or Q of the unknown is computed as follows For LOW D D of series C Dr where Dr is z the D value at applied frequency i kHz D is the D reading on the D scale 1 kHz For HIGH D D of parallel Dg Dy 4260 REAR PANEL ExT OSC 2 TUNED NULL DETECTOR Figure 3 3 Operation with External Generator 02331 1 8 1
108. ine Rays Inc 01330 Amerock Fullerton Hughes Antra Newport Bean Lancaster 114453 Amper r Eletlionic Co Div af Nath Palo Alto American Phillips Go Inc Hichayilla N Y Qwensbore Ky 73508 Bradley Samiconduclal Corp Saencumductor Dw Mouritan View Calif 35434 Inc Chicago 111 73559 Carling Electric Inc Shockley SemixCondutter 35188 Slameyck Products Lid 13682 George K Garratt Co Diw Pala Alto Calif Hawkesbury Canada WSL Indusiries Racheway H J 37442 Mallory inc indianapolis Ind 7371 Federal Screw Products Int Los Angeles Calif 39543 Methanscal industries Pied Co Ohio 73743 Fischer Special Mig Co Pomona 0820 Miniature Precision Beacings Ing Kaane N H 33793 The General Industries Burgess Bafiety 42180 Co Magara Falls Antario Canada 43590 Norgren The Bristol Ca Watartury Conn Mig Co Ill T3905 Jennings adie Wig Sloan Company Sun Valley Calif 47904 Polaroid Carp Cambridge Mass 16176 Inc ITT Electie Ine Div 48620 Pratision Thmumomster amp last Co 14355 1 8 Winns and Phoen Arizona Semiconductor 44855 Raytheon Company Operations Div of C 8 5 lne Lowell Mass 52090 Rowan Contioller 18028 Babcock
109. itch 5102 routes signals to and from various functional circuits in the instrument set to R position 40 Vde is routed through 5102 and RANGE switch 5101 to the unknown R For L measurements the bridge arm connections to the DQ and CRL controls are reversed from that for C meas urements This technique maintains the same phase relationship for the bridge error signal and the ref erence voltage for the AUTO null circuit The CRL direction indicator lights are also energized ior Cp AUTO or Ls AUTO position of the FUNCTION switch R110 and R111 are fixed bridge resistors selected by FUNCTION switch 102 4 18 POWER SUPPLY AND 1 kHz OSCILLATOR A200 Schematic Diagram Figure 8 4 4 19 Assembly A200 includes four power supply sec tions which generate operating dc voltages and also a 1 kHz oscillator circuit The 13 and 12 Vde outputs are regulated and the 40 and 110 Vde outputs are not The oscillator circuit generates the 1 kHz signal for driving the instrument bridge circuit during L or C measurements 4 20 POWER SUPPLY 4 21 PRIMARY POWER As shown in the schematic of Figure 8 4 either 115 Vac or 230 Vac is applied through fuse F1 and LINE switch 81 to T1 primary Rear panel 115 230 switch 52 connects T1 primaries in parallel for 115 Vac operation or in series for 230 Vac operation 4 22 13 VDC SUPPLY The regulated 13 Vdc sup ply consists of full wave rectifier CR201 CR202
110. ith unknown capacitor Cx represents the inherent resistance of any capacitor L kHz signal replaces the dc voltage used in meas urements The relationships for this equivalent bridge circuit are given in B In this mode Ct is in series with Rc DQ control and loss resistance Rx is in series with unknown capaci tor Cx This circuit is similar to the circuit of B except that Rc is replaced by Rd Rd represents a voltage adjust able resistor which electronically adjusts this bridge arm resistance and eliminates the need for simultan eous bridge adjustment with more than one control Thus with the Model 42604 the capacitance measure ment can be made quickly with only the CRL control Unknown inductance Lx has aseries resistor Rx which represents the resistance of the coil windings and loss of inductor This circuit is similar tothe series inductance equiv alent circuit except that loss resistance Rx is in parallel with Lx and Ct is in series with Re DQ control This circuit is similar to E except that is replaced by Rd Hd represents a voltage adjustable resistor whichelectronically adjuststhis bridge arm resistance and eliminates the need for simultaneous bridge ad justments with more than one control Thus with the Model 4860 the inductance measurement can be made quickly with oniy the CRL control Figure 4 1 Basic Bridge Circuits 0233 7 2 042040 4 N 17 FUNCTION sw
111. matic troubleshooting and repair c adjustment procedures are given in the order recommended for use these adjustments include checks of critical components in the bridge circuit and also selection procedures for factory selected components d operation checks o printed circuit assemblies 5 3 TEST QUIPMENT 5 4 Recommended test equipment for performing the checks and adjustments outlined in this section is listed in tabularform with the procedure to be per formed Test instruments other than those listed can be used if their specifications equal or exceed the listed characteristics 5 5 INSTRUMENT COVER REMOVAL 5 6 To remove top or bottom cover remove two screws at rear of cover slide cover toward rear of instrument and lift cover off Slide covers are re moved by taking out four screws in each cover and lifting cover off WARNING 115 or 230 volt ac terminals are exposed when bottom or side covers are removed Exercise caution during troubleshooting adjustments or repair avoid damage disconnect power during adjustment or repair 5 7 ASSEMBLY IDENTIFICATION 5 8 Table 4 1 lists the assemblies in the Universal Bridge Assemblies are identified by assembly num ber for example A200 5 9 PERFORMANCE CHECK 5 10 Performance checks outlined in Table 5 2 can be used an operating check for the instrument These checks can also be used a as anincoming inspection check of ins
112. ment Connect shielded cable toJ4 pin 1 This comp letes the adjustment 5 27 CRL COUNTER ADJUSTMENT a Remove power cable from the 4260A to unground the instrument b Disconnect shielded cable from resistor c Set CRE counter to 0001 d Loosen screws B in Figure 5 3 and separate counter gear from gear train e With a 1 meter or another 4260A with external null meter adjust resistance of to be 5 0 ohms f Set CRL counter to 0001 and engage counter with gear train g Tighten screws loosened in step d and check to engure that CRL control operates gear train easily without slippage If too stiff loosen screws and readjust h Connect shielded cable to R3 This completes the adjustment 5 5 Section V Model 4260A Tables 5 3 and 5 4 Table 5 3 Test Equipment Required for Troubleshooting J Nem Deseription O O HP Model Range 1 mV to 300 Ydc Input R 1 megohm 413A 200CD 175A with 11804 Horizon tal and 1750B Dual Trace Vert Ampl Plug ins Standard Components See Table 5 1 Performance Check Test Equipment Table 5 4 Trouble Symptoms and Possible Causes Dc Voltmeter Oscillator Oscilloscope Frequency 20 Hz to 20 kHz Output Level 2 volts rms max Vertical Sensitivity 50 mV cm No lamps light No meter deflection for R measurements No meter deflection for C amp L measure ments Noisy null or no bridge null obtained for R measurements
113. nd it effectively becomes a tuned amplifier with overall loop gain maximum Breakdown diode CR401 in Q403 emitter establishes the operating point for this transistor 0404 is an emitter follower which supplies the amplified error signal to part of the phase detector Phase shifting network R420 and C412 causethe output voltage wave form at Q405 emitter to lead the error signal by 90 Diodes CR406 through CR40 afull wave rectifier to provide a for the meter which is proportional to bridge unbalance 4 50 ONE SHOT MULTIVIBRATOR 4 51 The one shot multivibrator OS MV receives the negative pulse via pin 12 from switching amplifier 9313 and generates 1 kHz square waves Comple mentary square waves from both collectors of the OS MV are applied to phase detector diodes CR412 and CR413 4 52 The quiescent state of the OS MV is Q406 off Q407 on RC combination C416 C417 R425 differ entiates the positive going trailing edge of the nega tive input pulse The resulting positive pulse at Q406 base turns this transistor RC combination R428 C418 determines how long the Q407 Q406 on con dition exists Diodes CR410 CR411 provide a speed up actionfor the OS MV when it changes states so that the square wave edges are sharpened 02337 1 b3 PHASE DETECTOR 54 The phase detector circuit receives square waves from the OS MV and sine wave from the error bignal amplifier Avarying dc outpu
114. or 7 SK Q 20 5 5 1 4W metal film or WW 07 42 07 58 K Resistor 5K 2 20 5 1 4W metal film or WW 04 94 05 06 K 2 Resistor 2K 0 5 1 4W metal film or WW 01 97 02 03 K 2 Resistor 1 20 57 1 4W metal film or WW 0988 1011 2 Resistor 100 2 20 55 1 4W WW 098 0 101 10 Resistor 10 R 20 57 1 4W WW 09 78 10 21 2 Resistor 1 0 5 1 4W WW 00 97 01 03 2 1 To measure the maximum voltage at the UNKNOWN terminals for R measurements connect only a Volimeter to these terminals j Set FUNCTION to R RANGE full cew and rotate CRL to 1030 k Voltmeter should indicate between 30 and 40 Vdc for 115 or 230 volts ac power 4 INTERNAL OSCILLATOR Frequency 1 kHz 2 Voltage 100 mV rms 20 a Connect equipment as shown in Figure 5 2 Set FUNCTION switch to Ls LOW Q position Rotate CRL control to 1030 Rotate DQ control full cew Read frequency displayed on counter and voltage indicated on voltmeter Counter should display between 980 Hz and 1020 Hz and meter should indicate between 80 and 120 millivolts rms HP4036 VOLTMETER REAR PANEL 4250 FRONT PANEL HP 52451 5261 COUNTER DO NOT GROUND TO POWER LINE GROUND USE SHIELDED CABLE AND CONNECT BIAS BAT TO UNKNOWN CABLE SHIELD Figure 5 2 Internal Oscillator Check 5 4 02337 2 O428Q A 7 R6 02357 1 Model 42604 instrument Serial No Tests Performed
115. ower to instrument by connecting ac power cord and setting LINE switch to ON One of the deci mal point lights in the CRL counter will light to indi power is applied to the instrument Allow 30 seconds for the instrument to stabilize The 4260A is now ready to use The following paragraphs outline procedures for standard R L and C measurements 02337 2 3 5 USE OF THE DQ VERNIER 3 6 The DQ VERNIER control provides fine electri cal adjusting during D or Q measurements The DQ dial setting does not change as the DQ VERNIER is changed For any setting of the DQ VERNIER DQ dial accuracy is maintained as outlined in Specifica tions The DQ vernier is useful for large D or small Q measurements Using the DQ vernier for a bridge nul prevents false nulls caused by lack of resolution with the DQ control DQ VERNIER ranges are 0 CAL to 0 001 in LOW D range 0 CAL to 0 016 of 1 0 in HIGH D range 0 CAL to 0 016 in LOW Q range 0 CAL to 0 001 of 1 Q in HIGH Q range 3 7 DC RESISTANCE MEASUREMENTS 3 8 POWER CONSIDERATIONS 3 9 Power applied to the unknown resistor will vary depending upon the unknown value the RANGE switch position and the CRL control setting Maximum open circuit voltage across the UNKNOWN terminals is 40 Vde Short circuit current through the UN KNOWN terminals is 25 milliamperes maximum Voltage across the unknown resistor can be measured with a high input impedance Voltmeter such as the H
116. ows a Make the resistance measurements as outlined in Paragraph 3 12 or 3 13 and leave the Model 4260 up for the null b Remove the shorting strap on the voltmeter rear panel ground terminals to avoid ground loops c Connect the voltmeter input ground or low ter minal to the rear panel detector ground terminal on the Universal Bridge Connect the UNKNOWN high terminal to the other voltmeter input terminal d Read voltage across the unknown R on the volt metor e For current through the unknown R clip the milliammeter probe to one of the unknown leads and read unknown current 3 16 CAPACITANCE MEASUREMENTS 3 17 INTRODUCTION 3 18 Capacitance measurements are normally made at a frequency of 1 kHz from the internal oscillator For C measurements at frequencies between 20 Hz and 20 kHz an external oscillator can be connected as outlined in Paragraph 3 42 Special Measurements Direction lights indicate the correct rotation direc tion for Cp AUTO measurements The measured C value is displayed on the CRL counter with correct decimal point location units and equivalent circuit also displayed Dissipation factor D can be meas ured aiter the bridge is balanced for the capacitance measurement The measured D value is displayed on the DQ dial 3 19 RESIDUAL CAPACITANCE 3 20 The residual capacitance of the UNKNOWN terminals can be measured with nothing connected to these terminals value is typically
117. p LOW Q 4 Remove shorting strap from BIAS BATTERY terminals 5 Measure the dc resistance between UNKNOWN LOWterminalandterminal 40 Page 8 4 E this value is 1 ohm 0 5 select C101 for L difference readings within 0005 as discussed in step i If the value is not 1 ohm 0 5 check contacts of 8101 and 5102 5 38 SECOND RANGE CHECK The following pro cedure checks 10 ohm resistor R102 inside RANGE switch A100 a Connect test setup as shown in Figure 5 5 b Connect a standard 1 mH inductor such as Gen eral Radio 1482E The inductor high terminal is con nected to the unmarked UNKNOWN terminal and the inductor low and guard terminals should be connected to the UNKNOWN LOW terminal The inductor case should be isolated from ground Set FUNCTION switch to Ls LOW Q d Set RANGE switch for XX mH display e Set oscillator INT EXT switch to EXT and ad just oscillator frequency to 1 kHz f Balance the bridge and read the measured L value Measured L value mH g Disconnect the standard inductor irom the UN KNOWN unmarked terminal and connect 330 ohm 5 1 4 watt resistor in series HP4260 REAR PANEL EXT ZOAZ osc 202 HP2COCD OSCILLATOR USE SHIELDED CABLE AND CONNECT LOW CABLE SHIELD TO DET GRO Figure 5 5 Test Setup for Adjustments 02337 1 5 11 Section V Paragraphs 5 39 to 5 51 h Set oscillator frequency to 20 kHz 1 Balance the bridg
118. procedure for the other standard capacitors listed and connect resistors as indicated 2 INDUCTANCE MEASUREMENT L Range 1 uHto 1000 L Accuracy 1 1 digit from 1 mH to 100 H a Forthis check locate the following inductors Standard Inductor L Readings Ls Low L Readings in Ls AUTO 1 mH 0979 1021 uH 0974 1026 uH 10 mH 09 89 10 11 mH 09 84 10 16 mH 100 mH 098 0 101 1 mH 098 4 101 6 mH Note Lp L readings in Lp High Q should be as follows Lp Ls 1 1 09 where Ls L readings in Ls Low Q Q Q readings in Ls Low Q or Lp High Q b Set FUNCTION switch to Ls AUTO c Connect 1 mH standard inductor to UNKNOWN terminals d Set CRL counter to 1000 Set RANGE switch on uH range to light right decimal point light e Rotate CRL control for meter null at center and observe that CRL direction lights change at null position f Set FUNCTION switch to Lp LOW D or Ls HIGH D and adjust DQ dial for meter null Slight adjustment of CRL control may give best null Read the measured L and Q values These values should be within the values listed above for the standard inductors 8 Repeat the proc dure for the other standard inductors listed 3 DC RESISTANCE MEASUREMENT Range 10 milliohms to 10 megohms Accuracy 1 1 digit from 10 ohms to 1 megohm 2 1 digit from 10 milliohms to 10 ohms and 1 megohm to 10 megohms Residual Resistance approximately 3 milliohms or less
119. r capacitor J jock RT thermistor w cable cP coupler K relay B switch x socket CR diode L inductor T transformer Y Crystal DL delay line M meter TB terminal board DS device signaling lamp MP mechanical part TP test point ABBREVIATIONS amperes H henries NPN negative positive RMY roct mean square A F C automatic frequency control HEX hexagonal negative RWY reverse working AMPL x amplifier mercury NRFR recommended for voltage B F O beat frequency oscillator HR hour s NER replacement S B Blow blow boryllium copper IF intermediate freq rR pepavately SCR acrew BH binder head IMPG impregnated BE selenium BP bandpass INCD incandescent SECT sectionis BRS brass INCL include a DBD order by description SEMICON semiconductor BWO backward wave oscilator INS insuiaon ed oval head silicon INT internal Oxide BIL allver CCW sountar clockwise BL glide CER ceramic 1000 SPG CMO cabinet mount only LH left hand P peak special COEF coefficient LIN linear taper PG printed circult 5 SST stainless steel COM common LK WASH lock washer PF 10 SR pit ring COMP composition logarithmic teper STL steel COMPL complete LPF low page filter PH BRZ phosphor bronze tantalum CONN connector M milli 10 8 PEE Philips TD t
120. rear controls connectors and indicators are briefly explained in Figure 3 1 3 3 TURN ON PROCEDURE 3 4 Before applying power to the instrument set controls as follows a Set FUNCTION control for type of measurement to be made and RANGE switch near mid range b Set SENSITIVITY control near full counterclock wise to reduce meter sensitivity c Set CRL control to 1030 d Set red VERNIER DQ knob full counterclockwise to CAL e Set rear panel 115 230 volt switch to expose numbers which correspond to the line voltage used 1 Set rear panel OSCILLATOR switchto INT 1 Three rear shorting straps should be in place see Paragraph 3 42 for special measurements meter pointer is not mechanically centered center as follows 1 Turn instrument off Wait 30 seconds for all capacitors to discharge 2 Remove two screws which hold top cover to rear panel and slide cover toward rear 8 Locate the black zero adjust screw at top center of meter Rotate screw clockwise until meter pointer is toleft of zero and begin moving right toward zero 4 Continue to rotate screw clockwise stop when pointer is on zero the pointer overshoots zero repeat steps 3 and 4 5 When pointer is exactly on zero rotate screw approximately 15 degrees counterclockwise This is enough tofreethe adjustment screw from the meter suspension H pointer moves during the step repeat steps 4 and 5 h Apply p
121. rs onthe rear panel are shorted withtheir respective shorting straps Rotate the SENSITIVITY control full cew d Set FUNCTION switch to Cp AUTO position e Connect the capacitor tobe measured to the UN KNOWN terminals 3 4 Ethe right direction indicator is lit rotate CRL control clockwise If the left direction indicator is lit rotate CRL control counterclockwise Rotate SENSITIVITY control clockwise to give near full scale meter deflection g H the CRL control is fully cw and the right di rection indicator remains lit turn RANGE switch until left direction indicator lights Adjust CRL con trol for meter null and rotate SENSITIVITY control cw as null is approached h When null bridge balance is achieved below 0100 on the CRL indicator set RANGE switch to the next position ew and rotate CRL control for null indi cation This is possible for all measurements above 100 pf Capacitance is indicated on the CRL counter i To measure D for the unknown capacitor set FUNCTION switch to Cp HIGH D position j Adjust DQ control for minimum meter indication The CRL control ean be adjusted slightly for best null k When a null indication is impossible in the Cp HIGH D position set FUNCTION switch to Cs LOW D 02337 2 just DQ control for minimum meter indication The ai the unknown capacitor is read from the D scale P3tieated by the red pointer in the DQ window 8 34 The fastest pro
122. rument set up at null b Isolate the Voltmeter from power line ground by using two prong power cord adapter and leaving the adapter pigtail lead disconnected from ground Connect the Voltmeter input ground terminal to the 4260A rear panel detector ground terminal d Connect the other voltmeter input terminal tothe 4260A UNKNOWN terminal not the LOW terminal Read the voltage acrossthe unknown C onthe voltmeter 3 21 INFLUENCE OF D IN Cp AUTO MENT 8 28 The accuracy that is specified for Cp AUTO measurement is obtained when D is less thani When D is greater than 1 accuracy of Cp AUTO measure 02337 1 Section III Paragraphs 3 24 to 3 35 ment is reduced due to the reactance of the variable resistance circuit of the AUTO null Typical data is ghown 1n Figure 3 2 1 ALLOWARLE ERROR SPECIFIED j EXPECTED ERROR SPECIFIED j TYPICAL guo u J o 1 m 29 50 10 20 50 I 50 20 10 05 Figure 3 2 Capacitance and Inductance Errors in AUTO vs D amp Q 3 29 INDUCTANCE MEASUREMENTS 3 30 INTRODUCTION 3 31 Inductance measurements are normally made at frequency of 1kHz fromthe internaloscillator For L measurements at frequencies between 20 Hz and 20 kHz an
123. se be used as bench instrument or it can be rack mounted rack mounting kit HP No 5060 0776 is supplied with the instrument When only half the case is used a blank filler panel HP No 5060 0794 is available to enclose the unused haif 2 10 ADAPTER FRAME The adapter frame HP No 5060 0797 in Figure 2 1 is rack frame that accepts any combination of sub module units it can only be rack mounted Install instruments in the adapter frame aa follows a Place adapter frame on edge of bench and stack sub module units steps 1 and 2 in frame Place spacer clamp between units step 3 b Insert two end spacer clamps step 4 and push units into frame c Insert screws on either side of frame step 5 and tighten until units are tight in frame d The complete assembly is now ready for rack mounting ADAPTER SUB MODULAR UNIT SPACER SPACER CLAMP RETAINING SCREWS Figure 2 1 Adapter Frame 2 1 Section II Figure 2 2 STEP SLIDE PART TO LIMIT STEP 2 SLIDE BOTTOM PART TO LIMIT 3 PUSH IN TO LIMIT STEP 4 SLIDE OVER TO LIMIT 2 DIVIDER LATCH Model 4260A DIVIDER ASSEMBLY SUBMODULE RETAINER PUSH DOWN TO RELEASE sTEP 8 PLACE INSTRUMENT INTO CASE STEP 7 SET RETAINER BACK INTO PLACE STEP PUSH UP TO LOCK Figure 2 2 Combining Case 02337 1 42604
124. t results at R43 5 R436 junction which is proportional to bridge unbal ance The phase detector is actually two phase de fecting circuits one for the variable resistance cir euit and second for the CRL direction light control circuit 4 55 The error signal sine wave from Q404 emitter is applied through C411 to CR412 CR413 junction The complementary square waves from the 05 MV are applied through R433 and R434 to the other ends of these diodes When Q408 collector is positive 4 4 volts and 0407 collector is zero diodes CR412 and CR413 conduct Error signal amplifier output voltage appears at R435 R436 junction without attenuation gt WhenQ406 collector voltage is zero and 0407 collec tor is 44 4 volts CR412 and CR413 are cut off error signal amplifier output voltage does not appear at R435 R436 and this junction isthe same voltage level asthe average voltage level of 2 2 volts The voltage level at R430 R431 junction is the average level of 2 2 volts Thus the differential output between R435 R436 junction and R430 R431 junction is the synchronized rectified output of the error signal This output is supplied to Q408 for proportional contro of the vari able resistance circuit 4 56 Operation of the CR414 CR415 light control section of the phase detector is similar except that the error signal sine wave is phase shifted 90 ahead by R420 C412 Q405 combination When the bridge is unbalanced
125. the last five digits identify particular instrument inthat series If the serial prefix on the rear panel of your instrument does not agree with the serial prefix on the title page this manual there differences between your instrument and the one described inthis manual which are explained in the insert sheet sup plied with the manual If the insert sheet is missing the information ean be supplied by your nearest Hewlett Packard field office addresses are listed at the back of this manual 1 8 APPLICATIONS 1 9 The Model 4260 makes quick easy measure ments of R L C D or Q characteristics of passive electronic components R L and C measurements are made with 3 or 4 digit resolution With external null voltmeter accurate measurements are possible for milliohms megohms The instrument is readily portable accessory carrying handle HP 11057 can be easily attached without screws 1 10 SPECIFICATIONS 1 11 Tabie 1 1 lists all technical specifications for the Model 42604 Universal Bridge Figure 3 4 shows DQ range versus frequency characteristics 1 12 AUXILIARY EQUIPMENT REQUIRED 1 13 External dc null millivoltmeter such as the HP Model 4134 is recommended for accurate R meag urements below 100 ohms and above 10 kilohms Ex ternal generator such as HP Model 200 CD with 2 volt output and 600 ohms output impedance is required 20 Hz to 20 kHz measurements External tuned null detec
126. tor with 90 dB gain and input impedance greater than 10 kilohms or oscilloscope with 100 uV em sen sitivity is recommended for the measurement with external generator 1 1 Section I Model 4260A Table 1 1 Table 1 1 Specifications CAPACITANCE MEASUREMENT AUTOMATIC NULL DIRECTION INDICATOR CAPACITANCE Direction of the control rotation required for Range pF to 1000 uF in ranges the bridge null is automatically indicated by the Accuracy front panel indicator lights 1 1 Digit from 1 nF to 100 uF 2 1 Digit from 1 pF to 1000 pF Residual capacitance 2 pF DISSIPATION FACTOR OSCILLATOR AND DETECTOR INTERNAL OSCILLATOR 1 kHz 12 100 mV Range LOW D D of series C 0 001 to 0 12 rms 4209 HIGH D D of parallel C 0 05 to 50 INTERNAL DC SUPPLY Less than 40 volts at Accuracy o nominal C line voltage DIAL DIVISION whichever is 0 002 INTERNAL DETECTOR Tuned amplifier at 1 kHz HIGH D 1 D of parallel C 5 0 05 functions as a preamplifier for measurements or ONE DIAL DIVISION of LOW Q dial with external generator whichever is greater EXTERNAL OSCILLATOR 20 Hz to 20 kHz meas C greater than 100 pF urements of capacitance inductance dissipation factor and quality factor are possible with INDUCTANCE MEASUREMENT external oscillator range will be a function of INDUCTANCE applied frequency Range 1 uH to 1000 H
127. tru ment specifications b periodically instruments used in systems where reliability is of utmost importance c as part of a troubleshooting procedure to locate operation problems and d after any repairs or adjustments before return ing instrument to regular service 02337 2 Table 5 1 Performance Check Test Equipment Model Recommended Unit Part Number C nF 40 2 sil mica 8 C 0 1 pF 0 2 sil mica YHP 8 0 1 C 0 01 nF 20 275 mica YHP 8 0 01 1000 pF 0 2 air CS 1000A 100 pF 20 2 air YHP CS 100A C 10 pF 22 55 500 WV cer 0160 0488 C 1 pF 1075 500 WV mica 0150 0029 L 1 mH 0 5 YHP 81 1 10 mH 0 2 YHP SI 10 1 100 mH 0 2 YHP SI 100 These resistors can be used for resistance R and dissipation factor D checks One per cent resistors areused with capacitors for D checks and 1 2 or better are used for resistance checks carb flm 10 M 1 495 1W 0760 0025 met flm 1 M 1 29 1 2W 0757 0017 met flm 99K 1 2 1 2 W 0757 0010 carb flm 29 9 1 1 2W 0727 0185 carb flm 15K 1 1 2W 0727 0168 met flm 10K 1 255 1 4W 0698 4203 ww 7 5K 1 495 1 8W 0811 0046 met flm 5K 1 495 1 8W 0698 3237 carb flm 1 1 2W 0727 0124 ww 2K 1 2 1 2W 0811 0285 carb flm 1 5K 1 1 2W 0727 0116 carb flm 1K 1 2 1 2W 0727 0451 carb ilm 300 0 1 1 2W 0727 0065 met flm 160 1 1 8W 0
128. ull circuits Switch contacts Neon lamp driver Differential amplifier Phase detector Error signal amplifier Switch contacts Bridge circuit Low impedance of high impedance amplifier Variable resistance circuit Fuse Lamps Power supply CR207 101 5102 Meter CR1 CR2 Power supply CR206 5101 8102 R3 R110 Oscillator Q205 to Q207 Amplifier Q401 to Q405 8101 5102 S3 C1 R3 to R5 5101 5102 R3 R101 to R110 C101 to C105 8101 5102 53 C1 R3 to R5 R101 to R109 R111 C101 to C105 Amplifier Q401 to Q405 Amplifier Q301 Q302 Q305 Q306 5102 Check voltages and waveforms todetermine faulty circuit 5103 S3 Q418 Q416 Q417 CR414 CR415 Q405 S101 102 R3 to R6 R101to R111 to C4 C101to C105 Amplifier Q301 Q302 Amplifier Q305 Q306 Q411 to Q414 CR416 to CR420 C421 L401 02337 1 Model 4260A SEALED PRECISION COMPONENT DO NOT OPEN FACTORY ALIS ONLY YOSQGAWA HEWLETT PACK AED 04240 71055 E Figure 5 3 Right and Left Side Internal Component Location Section V Figure 5 3 Section V Paragraphs 5 28 to 5 30 Model 42604 Table 5 5 Decimal Point and Units Indication Logic Cs LOW D Cp AUTO 5 28 DQ DIAL MECHANICAL ZERO With instrument power off and top cover removed rotate DQ control full ecw b Loosen two allen drive setscrews on R5 pulley
129. ur Meter Div Brooklyn Del g Radia Div of GM Ind Canoga Park Wontar View Holliston Mass Ges Plaines Ill Gel Theimenetics Gompany Mfg n Radio Indusi igg Subs Instiumsat Int DuPont and Co Inc The Bandi Carp Eclipsa Pranegi Div Themas Edisen Industries Dis of MeGrgw Ed sun Co West Dienge Elacira Mfg o N J Independence Kansas 86233 70276 70319 11318 11445 T0563 10813 10831 11402 1104 11285 31313 71400 TIE 1147 11440 lig al 11482 11701 nni 11783 71584 T2038 Mur T2354 1 9 72656 TUS Newark Wittek Mig Chitaga 1 Wollansak Div Moning 8 Wig Cn Paul Minn Allen Mig Co Allan Mig Allmetal Seram Product Ine Garden Chy N Y Allgniig Ihda Rubbgi Warks Inc Ghicage Ill Unian City N 1 Chicago Dlavetand Dhis New fork N Y Harttard Gorm Conn Ampante Int Belden Mig Gud Electronic Corp Biinbatt Radio Boston Gear Works Diy of Murray of Teras Bud Radio Willoughby Qno Camlne Fastener Carp Params Cardwell Condanser Corp Lindenhurst 1 1 N Y Bussmanr Mig Div 9 MeGraa Edigon Chicago Condenser Calif Spring
130. ure 3 4 DQ Range vs Frequency 3 8 Model 42604 a For Cs LOW D or Lp HIGH Q measurements remove the shorting strap from the rear panel DQ RESISTOR Cs Lp terminals b The external resistor should be selected as follows 1 maximum current 6 milliamperes resistance range 0 to 300K ohms 2 use a metal film or carbon film resistor Note The resistance of the external resistor used can be measured with the 4260A after the D or Q measurement is completed c Connect the external resistor tothe DQ resistor terminals from which the shorting strap was removed in step a d With the external DQ resistor andoscillator con nected balanee the bridge with the RANGE switch CRL and DQ controls Read the value ofthe unknown from the CRL counter and decimal point units and equivalent circuit as displayed 3 53 The or the unknown is given as follows for LOW D D of Cs D 1 2568 Dy f where Dr is the D value at applied frequency f kHz Dy is the D reading on the D scale and R is the external resistor value in K ohms For HIGH D D of Cp 1 f 1 256 R p For LOW Q Q of Ls Qr 1 256 R Q 1 where is the Q value at applied frequency 1 kHz is the Q reading on the Q scale and R is the external resistor value in K ohms For HIGH Q Q of Lp 1 Q 1 2568 2 X r Ole 3 54 C MEASUREMENTS WITH DC BIAS 3 55 GENERAL dcbias voltage 6 vde maximum can be appli
131. ures Remove power a Disconnect white green blue wire from J4 pin 10 and connect this wire to terminal 3 of DQ resis tor R5A b Set FUNCTION switch to Cp AUTO position Set RANGE switch to display XXX X nF d Connect 100 nF 0 1 uF 5 capacitor HP 0170 0001 and 27K ohm 5 resistor 0689 2735 in parallel across the UNKNOWN terminals e Remove detector assembly A400 and install 15 pin extender board HP 5060 0049 in A400 jack J4 Observe correct orientation and insert A400 in ex tender board Connect oscilloscope to test point 19 R430 8431 junction 5 12 Model 4260 f Apply power to 42604 and adjust CRL and DQ controls for minimum amplitude of waveform at test point 19 bridge balanced CRL counter should read between 095 0 nF and 105 0 nF and D reading should be between 0 053 and 0 065 on HIGH D scale g With the bridge balanced the waveformsof Fig ure 8 5 for test points amp through 16 should now result Turn power off and remove reference voltage assem bly A300 from J3 and install a 15 pin extender board inJ3 Observe correct orientation and insert A300 in 15 pin extender h Apply power connect oscilloscope to test points 5 through 16 and compare each waveform with those shown in Figure 8 5 5 46 DETECTOR ASSEMBLY A400 5 47 Conditions for observing waveforms at test points on A400 are the same as outlined in Paragraph 5 45 steps a through f 5 48 PHASE DET
132. values displayed with four digit resolution on an in line digital coun ter Q and D values are displayed a dial with a redhairline indicating the measured value The auto balance circuit and an easy to read meter reduce the time required for measuring low Q or high D compo nents Correct decimal point location is automatic and direction lights indicate which way the CRL con trol should be rotated for the measurement 1 4 TERMINOLOGY 1 5 The definitions of the following terms apply as they are used throughout this manual a RESIDUAL inductance or capacitance distri buted inductance or capacitance always present at UNKNOWN terminals b DISSIPATION FACTOR D loss factor for cap acitors equal to reciprocal of 9 QUALITY FACTOR Q figure of merit for in ductors equal to reciprocal of D d Cs represents equivalent circuit of capacitor in series with resistor e Cp represents equivalent circuit of capacitor in parallel with resistor f Ls represents equivalent circuit of inductor in series with resistor Lp represents equivalent circuit of inductor in parallel with resistor 02337 1 h AUTO NULL eliminates DQ manual control direction ior null is automatically indicated for Cp and Ls measurements 1 6 INSTRUMENT IDENTIFICATION 1 7 Hewlett Packard uses a two section eight digit serial number 000 00000 The first three digits serial prefix identify a series of instruments
133. ve going a nega tive pulse results at Q311 collector This negative pulse is 8 wide that is its duration is equal to the phase difference between the two phase comparator inputs 4 40 MILLER INTEGRATOR 4 41 The Miller integrator circuit receives the negative pulse irom the phase comparator and gener ates a positive shaped waveform The duration of the A shaped pulse is twice that oi the input neg ative pulse C318 is the integrating capacitor 4 42 SWITCH 4 43 Transistor switch Q313 makes a square wave from the A shaped input pulse The square wave output duration is equal to the input pulse duration Q313 is normaily oif When the input pulse starts Q313 saturates and remains on until the input pulse returns to its base line value The switched output is supplied at pin 15 to drive the one shot multivi brator on detector assembly A400 4 44 DETECTOR ASSEMBLY A400 Schematic Diagram Figure 8 6 4 45 INTRODUCTION 4 46 Assembly A400 circuits receive the bridge unbalance information and the 28 pulse from refer ence voltage assembly A300 These inputs are used to automatically adjust a variable resistance circuit 4 4 Model 4260A which replaces a resistance in one arm o the bridge for Cp AUTO or Ls AUTO functions In addition these inputs are used to control the direction indicator lights The right or left direction light is on depending on which waythe CRL control must be rotated to balance t
134. whose output is smoothed by C201 regulated by 0201 9202 Q203 and further filtered by C203 Breakdown diode CR203 provides 12 7 volt reference at Q203 emitter Output voltage variations are sensed at Q203 base amplified and supplied to driver Q202 base 0202 then controls regulator Q201 tooppose the output volt age change Resistor R204 across Q201 collector emitter provides protection for Q201 when the 13 Ydc output is overloaded 4 23 12 VDC SUPPLY The regulated 12 Vde supply consists of half wave rectifier CR204 whose output is smoothed by C204 regulated by Q204 and further filtered by C205 Breakdown diode CR205 pro vides a 12 7 volt reference at Q204 base When the output voltage starts to change this change is sensed by regulator Q204 which changes its dynamic resis tance to oppose the voltage change 4 24 40 VDC SUPPLY The unregulated 40 Vdc supply consists of half wave rectifier CR206 whose output is filtered by the RC combination of R207 and C206 Series resistor R207 limits the output voltage to the UNKNOWN terminals during R measurements 4 25 4110 VDC SUPPLY The unregulated 110 Vdc supply consists of half wave rectifier CR207 whose output is filtered by C207 This 110 Vdc is supplied via pin P FUNCTION switch 5102 and RANGE switch 5101 tothe decimal point and direction indicator neons 02337 1 Section IV Paragraphs 4 17 to 4 33 4 26 1 kHz OSCILLATOR 4 21 Transistors Q205 Q206 and assc
135. with the CRL counter too low an error signal is applied and the dc output to the light control differential amplifier is more positive With the CRL counter too high output is less positive 4 51 DIFFERENTIAL AMPLIFIER AND MILLER INTEGRATOR 4 58 This circuit uses the phase detector output to control the variable resistance circuit The Miller integrator provides stability for the overall feedback loop near nulior bridge balance when most sensitivity is required The differential amplifier output at 0408 collector is a dc level which changes with the phase detector input at Q408 base Integrator circuit Q410 and C420 amplifies Q408 output and stabilizes control of the variable resistance circuit Near nullor bridge balance point noise and random variations are mini mized by the integrator circuit 4 59 VARIABLE RESISTANCE CIRCUIT UU 4 4 60 Thevariable resistance circuit includes 6 Vde regulator 9415 phase splitter Q411 and emitter fol lowers 0412 0413 0414 Diodes CR419 CR420 are the heart of the variable resistance circuit with their bias state controlling their resistance In Cp or Ls AUTOposition this controlled resistance becomes the R value which replaces the DQ control in one arm of the bridge see Block Diagram Figure 8 2 02337 2 O4240 4 0 Section IV Paragraphs 4 53 to 4 63 4 61 Phase splitter Q411 conduction controls 419 CR420 bias throu
136. xas 55026 Simpson Co Somervilia N J Model 4260A Section VI Table 6 3 Table 6 3 Manufacturer s Code List The following code numbers from the Federal Supply Code for Manufacturers Cataloging Handbooks H4 1 Name to Code and H4 2 Code to Name and their latest supplements Tho date of revision end the date of the rupplements used appear at Cade Code Code Code Manufacturer Address Hanufncturar Address Mo Manufacturer Addrasz Na Manyfacturar 20000 1 1 8 Comag Any supplier of U 2137 Transistor Electronics Coig Minnaapalis 20193 General Ationies Corp Philsde phis 12815 Hugh Eby i H Sandwich Ill Old Saybrosk Conn i T5382 Kulka Elect 08145 Atobm Elactromcs Valley Calit 55933 Sorotna N Y ulka Corporation Verran 92977 Mophns Engineering Cati 0828 Electro Asgambiies inr Chiraga 55938 Raytheon Co Commercial Apparatus 8 TB Leng Blactne Mfg Go Chicago IIl 13508 Semiconducter Pred Dept Syacuse 0 569 Wallon Battery Cu of Systems fo Norwalk Conn 419818 Inc Des Plaines 11 03108 Apea Machine Co Dayton Ghia Canada Ltd Torento Ontario 56197 Spauidsng Fibre o Inc Tonawanda N Y 180015 Loid Mig Co Erie Campion MN Tara ld Hass Warth Adams Mass 5010 C W Marwedel Paul 76433 General l
137. y not give the correct value for the 02337 1 42604 ed unknown Also if electromagnetic or static on from the ac line or other source affects the known a satisfactory null indication will be difficult these cages a tuned null detector or selective amp Her with 90 dB gain and input impedance above 10K is recommended Note The electronic auto null circuit and direction indicator lights do not operate for measure mente with an external oscillator 3 46 OPERATION WITH EXTERNAL GENERATOR CAUTION DO NOT APPLY MORE THAN 2 VOLTS RMS AT THE EXT OSCILLATOR TERMINALS 3 47 For impedance measurements at frequencies other than 1 kHz between 20 Hz and 20 kHz con nect the external oscillator and associated equipment as shown in Figure 3 3 and proceed Check to insure that the DQ RESISTOR Cs Lp and Cp Lg terminals and BIAS terminals onthe instru ment rear panel are shorted by their shorting straps b Set external oscillator output voltage to mini gum and connect to EXT OSCILLATOR terminals see Figure 8 3 the most accurate and sensitive measure a tuned null detector such as the HP 302A is decommended However an oscilloscope with 100 Thcrovolt em such as the HP 140A with 14004 plug in can be used Connect the 42604 UNKNOWN LOW terminal tothe null detector high input terminal Con nect the detector low or ground terminal tothe 4260A rear panel detector ground term

HP 4260A User's Manual

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