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HP 1111A User's Manual

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1. 1 4 5 Circuit Operation 4 1 Componente 4 10 DC Biasing oA YS 4 2 VI REPLACEABLE PARTS 4 19 Output Amplifier 4 2 6 1 Introduction 4 15 Power Supply veu uae oc ee 4 4 2 6 4 Ordering Information LIST OF ILLUSTRATIONS Number Title Page 1 1 Model 1111A AC Current Amplifier 1 0 3 1 Front Panel Description and Operation Procedure x3 vee se e os 3 1 3 2 Peak to Peak Current vs Frequency 3 2 4 1 Simplified Input Amplifier Schematic 4 1 5 1 Special600 Q Load 5 2 9 2 Oscillator Voltmeter Test Setup 5 2 9 3 Signal Generator RF Millivoltmeter Test Setup es 3e oue Nes bp d 5 3 5 4 Rise Time Check Setup 5 3 9 9 Puise and High Frequency Response Test Setup soe oec I ds 5 4 5 6 Power Supply Assembly 5 5 9 7 Front Panel and Sensitivity Switch Components _ we ete Re 5 5 5 8 Etched Circuit Board Components 5 6 9 9 AC Current Amplifier Schematic 9 9 LIST OF TABLES Number Title Page 1 1 Specifications RS 1 0 3 1 Amplifier Gain rx 3 2 9 1 Test Equipment Required 9 1 5 2 Sensitivity and Accuracy Check 5 2 5 3 Calibration and Component Replacement RECOM La oe x DTI S w de 5 7 6 1 Reference Designation Index 6 2 6 2 Replaceable Parts Aero 6 5 6 3 Code List of Manufacturers 6 7 01862 TABLE OF CONTENTS Table
2. 0699 0001 R FXD COMP 2 7 OHM 10 1 2W 01121 EB 27G1 1 0721 0028 R FXO DEPC 48 7 OHM 1 1 8W 19701 DC 1 8A x i 0727 0025 R FXO DEPC 50 OHM 1 1 2W 19701 DC 1 20 i 5 0727 0021 R FXD DEPC 60 OHM 1 1 2W 19701 DC 1720 0727 0055 R FXD DEPC 201 OHM 1 1 28 19701 DC 1720 i 2 0727 0072 R FXD DEPC 403 OHM 1 1 2W 19701 DC 1 2C 0727 0100 R FXO DEPC 1K OHM 1 1 2W 19701 DC 1 2C ii 0727 0116 R FXD DEPC 2 03K OHM 1 1 2W 197011 DC 1 90 1 0727 0709 R FXD DEPC 15 4 OHM 5 1 2W 19701 DC 1 2A li 0727 0899 R FXD DEPC 5 OHM 2 1 2W 28480 0727 0899 1i 4 0760 0027 R FXO MET OX 150 OHM 2 1W 07115 i i 01111 00201 PANEL 28480 01111 00201 al 01111 46101 TERMINAL BOOT CABLE 28480 01111 46101 i 01111 61601 CABLE POWER 28480 1111 61601 1 3 01111 61902 SWITCH ASSEMBLY 28480 01111 61902 UEL H 01111 66502 AMPLIFIER ASSEMBLY 01111 66502 1 01111 67601 POWER PLUG ASSEMBLY 01111 67601 l 01111 80701 ASSY CAPACITOR 2000 UF 01111 80701 1i 1205 0011 HEAT SINK 1205 0011 1 1250 0125 CONNECTOR FEMALE BNC UG 1094 U io xt See list of abbreviations in introduction to this section 01682 2 6 5 Section VI Model 1111 Table 6 2 Table 6 2 Replaceable Parts Con t 49 Stock No Description Mfr Part No 1251 0348 PLUG 125 VOLT 160 11 1850 0075 TRANS ISTOR GERMANIUM PNP 2N779A 2N779 1854 0005 TRANSISTOR SILICON NPN 1854 0019 TRANSISTOR SILICON NPN 2N2368 1901 0025
3. check transformer rectifiers and power cable If the unregulated voltage is above 35 volts dc proceed to step i i Check de current into Q6 emitter Current should be about 36 ma to 48 ma If low and 14 volt supply is still low from step g supply regulator is at fault If high the load has excessive drain which must be corrected before the supply will regulate properly Check filter and bypass capacitors for shorts and test amplifier transistors j If 14 volt measurement is correct step g but 6 5 or 7 5 voltages are wrong check amplifier transistors Q5 and Q5 then Q3 and Q2 Then check filter and bypass capacitors for shorts k If unregulated voltage is low and current through R47 is high measure Q6 emitter current which should be 36 to 48 ma If emitter current is high load amplifier or filter capacitors is shorted If low Q6 or CR10 may be shorted 5 18 EXCESSIVE SQUARE WAVE SAG a Check low frequency response of Model 1110A probe against its specifications Clean probe jaw mating surfaces with a pencil eraser for perfect contact 01862 2 Model 1111A b Make sure the input impedance of the oscillo scope used with the Model 1111 is about 100K chms or Sag will result from the output coupling capacitor 0 1 microfarads in the Model 1111 c If sag persists clip a 10 1 scope probe on Test Point 1 with the current probe clipped on a square wave peak to peak current of approximately 10 times
4. numerical order of their reference designators and indicates the description and stock number of each part together with any applicable notes Table 6 2 lists parts in alpha numerical order of their stock numbers and provides the following information on each part a Description of the part see list of abbreviations below b Typieal manufacturer of the part in a five digit code see list of manufacturers in appendix c Manufacturer s stock number d Totalquantity used inthe instrument TQ column e Recommended spare part quantity for complete maintenance during one year of isolated service RS column 6 3 Miscellaneous and cabinet parts not indexed by reference designators are listed at the end of Table 6 1 A assembly F fuse B motor FL filter C capacitor J jack CR diode K relay DL delay line L inductor DS device signaling amp M meter E misc electronic part MP mechanical part A amperes F farads BP bandpass FXD fixed BWO backward wave oscillator GE germanium GL glass CER ceramic GRD ground ed CMO cabinet mount only COEF coefficient H henries COM common HG mercury COME composition HR hour s CONN connection CRT cathode ray tube IMPG impregnated INCD incandescent DEPC deposited carbon INS insulation ed EIA Tubes or transistors meeting Electronic k LIN linear taper ion standards will LOG logarithmic taper normally resul
5. C15 0122 0005 C VAR POLY 0 7 3 0 PF 350VDCW C14 0150 0121 C FXO CER 1 UF 80 206 5 C15 NOT ASSIGNED C16 0150 0121 C FXD CER 0 1 UF 80 2006 SOVDCW CY 0150 0121 C FXD CER 0 1 UF 80 2096 5OVDCW C18 0180 0076 CFXO ELECT 20 UF 25VDCW C19 0150 0073 C FXD CER 100 PF 10 500VDCW C20 0160 0128 C FXO CER 2 2 UF 20 25VDCW 0150 0121 C FXD CER 1 UF 80 20 50VDCW C22 THRU C24 NOT ASSIGNED C25 0150 0096 C FXD CER 0 05 UF 100VDCW C26 0150 0096 C FXO CER 0 05 UF 100VDCW C27 0180 0128 C FXD ELECT 100 UF 4100 109 40VDCW C28 0180 0138 C FXO ELECT 100 UF 100 109 amp OVDCW C29 0180 0049 C FXO ELECT 20 UF 50VDCW C30 THRU C31 NOT ASSIGNED C32 0180 0059 C FXD ELECT 10 UF 100 10 25VDCW 022 0180 0104 C FXD ELECT 200 UF 15VDCW C34 0180 0104 C FXD ELECT 200 UF 15VDCW CRL THRU CRA 1901 0025 SEMICON DEVICE DIODE SILICON 085 AND CRE NOT ASSIGNED CR 1902 0025 SEMICON DEVICE DIODE ZENER 10V CR8 AND CR9 NOT ASSIGNED 0810 1902 0078 SEMICON DEVICE 010DE ZENER 14 7V Jl 1250 0123 CONNECTOR FEVALE BNC J2 1250 0123 CONNECTOR FEMALE BNC 9170 0016 SHIELOING BEAD PLUG 125VOLT I See list of abbreviations in introduction to this section 6 2 f 01862 2 Model 1111 Reference Designation SvAK ij Stock No Section VI Table 6 1 Table 6 1 Reference Designation Index Cont d Description THRU I
6. Cop Hew Rochelle N Y Eitei MeCuliough iac Sam Btuno Calif 0631 Repco Division of Sessions Electro Molive Mig Co fac 30 Clock Ce Morristown R 1 Willimantic Conn 520 Schnitzer Alloy Products Elizadeth N 3 Coto Cil o lac Providence R i 59139 Temes Facsimile Corp New York X Y john Fast o Chicago ill 85131 Electinic industries Association Any brand Dialight Coto Brookiys be meeting EIA standards Washington D C General Ceramics Corp Keasbey 4 4 80207 T Switch Ow of m General lastrument Corg L Maxson Cora Watingford Coon Semiconductor Div Newark X J 86223 Umied Transtormes Corp New York N Y Guard Bopkins Oakland Calif 862458 Oxford Electric Corp f Chicago il Dtake Mfg Co Chicago ut 36294 Souris Laboratories inc Riverside Caii Hugh amp Edy Inc Philadelphia Pa 041 Acro Div d Robertshaw Gudeman Ca Chicago HL Futon Controls Co Cotumbus 18 Ihia Robert M Hadiey Ca Las Angeles Calif 89486 All Sigs Products inc Delignce Ohio Ene Resistor Corp Ene Pa B0 83 Hammering Co inc New York N Y Hansen Mig Co lec Princeton Ind 80640 Stevens Arnold Ca Inc Boston Mass H M Haiger Co Chicago ill Bi030 inieenatinaa instruments inc Helipot Gav Beckman 91073 Grayhill Co jin nt WEE pope QE it Fullerton Cab 81095 Triad Transformer Corp Venice Caiit Hughes Aucrait Co Newport Beach Calif 81312 Winchester Electonics Co Inc
7. Fastehsld Semicorducter Corp Mouniain View Calit Missesata Rudder Co Minneapolis Minn Technical Wire Products Springfield N J Costenestal Device Cop Hawthorne Cali Rheem Semconduciat Ceip Mountain View Calif Shackiey Semi Conductor Laboratories Bouaton Radia Cote 0 5 agineening 09 Burgess Savery Co Niagara Fatis Gatario Canada Pala Atto Calf Booatan N J Los Angeies Calif 0871 Sloan Company Burhank Calif 08718 Cannon Liectssc Co Phoenix Div Phoenix Ariz 8732 TBS Electronics Semicandoctor Operations Giv at C 8 S inc Lowell Mass 8984 MelReit Indiasacolis Ind 09026 Babcock Retays Inc Costa Mesa Calif 00114 Texas Casaente Co Houston Texas 8256 Eiecun Assembies inc Chicago 1i 0569 Maliaty Battery Co of Canada ile Toronto Onia ig Canada 93654 The Bristaf Ca Walerdury Cart 10214 General raasislos Wesleen Carp Los Angeles Calif 10411 Te Tai Ine Berkeiey Calif 10866 Carboruadum Co Niagara Falls N Y 11236 STS Berne inc Berne isd 4232 Chicago Telephone of California iae So Pasadena Calit 11314 Microwave lezltonscs Cop Pale Aito Salif 4434 Gunean Elecirosic Ing Santa Asa Calif HF Generat instrament Corgorateen Semiconductor Division Newark N J Impera Electroniz tac Besa Pack Catit LEAG Melaks Inc Pala Alto Catf 12897 Clarostat Mfg Co Dover N H 12B59 Nippon Co Lld Tokyo japan 12920 Deita Semico
8. Hewish Pack c 201 747 4060 Indianapolis Ind 44205 y ewiet Packard Company up vesti 4 Eirabem Stet ince 317 546 4891 A 215 248 1600 and 828 6200 Baltimore Md 21215 HM Associafes Inc Comp Hill Pa WASHINGTON D C AREA 3006 West Cold Spring Lane Robinson Salas Division Richmond Ya 23230 Horman Associates inc 301 664 4400 Hewlett Packard Company Bivins amp Caldwell fne 94i Rollins Avenue 707 737 8791 2112 Spencer Road Rockville Md 20852 703 282 545 301 427 7560 Seattle Wash 98109 Denver Colo 80222 Kansas City Mo 64131 St Paul Minn 55114 Montreal Quebec ARYA Inc Lehana amp Company Harris Hanson Company Crossley Associates Inc Hewlett Packard Canada Ltd 1320 Prospect Street P O Box 22065 7916 Paseo Street 842 Raymond Avenue 8270 Mayrand Street 205 522 0177 Belleview Valley Hy interchange 816 444 9494 612 646 7098 514 735 2273 303 755 1233 Ottawa Ontario Hewlett Packard Canada Ltd Salt Lake City Utah 84115 aah Major S ajor St h 1742 Carling Avenue 801 486 8166 813 722 8152 S j acramento Calif 5821 r4 Toronto Ontario Neely Enterprises s Hewlett Packard Canada Ltd 916 482 1463 F Z i415 Lawrence Avenue W 416 249 9194 SAN FRANCISCO AREA Neely Enterprises Chicago Hi 60645 501 Laurel Street Crossley Associates Inc San Carlos Calif 94071 2501 West Peterson Ave 415 591 7684 312 275 1600
9. LOS ANGELES AREA Neely Enterprises 3939 Lankershim Blvd St Louis Mo 63144 Harris Hanson Company 2814 South Brentwood Blvd 314 647 4350 213 877 1282 and 756 3811 High Point N C 27262 San Diego Calif 92106 NN Bivins amp Caldwell Inc Neely Enterprises 1923 N Main Street 1055 Shafter Street 3i9 882 5873 714 223 8103 Scottsdale Arix 85251 See Neely Enterprises 3 ive N E 3009 No Scottsdale Rd m ton Mapia Brive is North Hollywood Calif 1604 502 945 766 N Oriando Fla 32803 Albuquerque N M 87108 Stiles Sales Division Neely Enterprises Hewlett Packard Company 501 Lomas Bivd N E 62 Commonwealth Ave 505 255 5586 305 425 5541 Tucson Ariz 85716 kas Cruces N M 88001 Dallas Texas 75209 Houston Texas 77027 HuntsviHe Ala 35801 St Petersburg Fla 33708 Neely Enterprises Neely Enterprises Hewlett Packard Co Hewlett Packard Co Bivins amp Caldwell lnc Stiles Sales Division 232 So Tucson Byd 114 S Water Street P O Box 7166 P O Box 22813 Holiday Office Canter Hewlett Packard Company 602 623 2564 505 524 2486 3605 Inwood Road 4242 Richmond Ave Suite No 410 i50th Ave Madeira Beach 214 357 1881 and 332 5667 713 657 2407 205 881 4571 813 391 021 A For replacement parts and repair services in the San Francisco area please contact Hewlett Packard Company 395 Page Mill Road Palo Alto California Tel 415 326 3950 indicates Instrument Repai
10. Metals anc Conlicis fsc Bev of Texas inglremests inc Spencer Prods Research Products Corp Roton Masulactusieg Ca Ine Greeenwich Cosa Empotium Pa East Newatk 8 J Chicago iH Attiebarg Mass Madison Wis Woodstock N Y Vector Etectrenic Co Glendale Calif Western Washer Mtr Co ios Angeles Calif Catt Fastener Co Cambridge Mass New Hampshire Bail Bearing tac Peterborough N H Qlartingtos S C ies Angeles Catit Union N J Red Bank amp J Mundelein Srookiyn N Y Chicago Hi Pytaitid Efectric Co Eiectra Cords Co Victory Eaguneeemip Corp Bendix Corp Red Sank Div Hubbell Corp Smith Herman amp Central Screw Ca Gavitt Wire and Cable Ca Div Amerace Cop Burroughs Corp Eiectroniz Tute Div Eveready Battery Model Esg and Mig inc Loyd Scruggs Ca Arco lectionis lec A J Glesener Co lac Goog All Electric Mfg Co Sarkes Tarzian inc Booatoa Molding Company A B Boyd Co R M Bracamonte Co Kords inc Seamless Rubber Co Chicago Hi Ciifton Precision Products Ctillon Heights Pa Precision Rubber Products Gorg Dayton Ohio Radio Carp of America ROA Electron Tube Div Pilco Corporation Lansdale Division Western Fidtous Glass Products Co San Francisce Calif Seattle Wash Liacota ill Brockfield Mass Plainfieid N i New York N Y Huntington ind festus Mo New York X Y 945 Franc
11. Miniatura Precisron Bearings inc Keene N H 42190 Muter Co Chicago Hi 43990 C A agen Co Engtewood Cale 44655 Ohmite Mfg Co Skokie 1 11904 Poirot Corp Cambridge Mass 48620 Precisson Thermometer and inst Co Philadelphia Pa 49956 Rayiheon Company Leumgton Mass 52096 Rowan Contraiier Co Baltimore Md 00015 35 Revised March 9 1964 Code No 3743 54234 526 5931 55338 58137 5185 59445 58110 8741 aes 82118 63745 64959 65097 88795 55548 7236 70303 10319 11485 19983 18301 29998 71902 1941 11218 11256 11515 74406 71436 11450 11468 nel 11482 1590 1198 11144 11753 1785 11384 12092 12136 nU 72354 72649 72656 12699 T2758 12155 72825 72528 72984 77582 306i 13076 13138 13221 nas 13490 73506 2558 14882 334 3143 11931 13908 14455 ave been arbitrarily assigned to suppliers not appearing in the H4 handbooks Code Manufacturer Address No Manufacturer Address Waid Leonasd Efeciric Mi Vernon 74861 Industral Condenser Corp Chicago Ill Shallcross Mfg Co Seima N C 14868 RLF Products Division of Amphendi Simpson Electric Co Chicago ll Borg Electronics Carp Danbury Cont Senotane Corp Eimsfotd N Y 74970 johnson Co Waseca Minn Sarenson Co inc e Notwati Conn 75647 international Resistance e Philadelphia Pa Spaulding Fibre Co tec Tonawanda H Y 1511 jones Howard B Division Sprague
12. Natwalk Cons Amperex Co Div of North 81348 Militaty Specification Amencan Phittios Co ise Bicksville M Y 51415 Wilkor Products Inc Cieveland Ohio Beckman elipol Corp Sp Pasadena Cahit 81453 Raytheon Mig Co Industral Components Bradley Semiconductor Corp Hamden Conn Div Indust Tube Operations Newton Mass Carling Electric lnc Hastterd Conn 83483 internafional Rectsier Corp Segundo Cait George K Garrett Co Inc Philadelphia Pa 31541 The Airpaa Products Co Cambridge Mass Federal Screw Prod Co Chicago Hi 1869 Batty Controls inc Watertows Mass Fischer Soeclai Mig Co Cincinnati Ohio 82042 Carter Parts Co Shoke IH The General Industries Co fiyria Ohio 82142 Jeims san D visios of EA m peer Carbon Co 1 Pa Wigs E Atl REID Alles B SuMont Labs Enc Clifton 1 5 Wns and Sons Winchesier Mass From F S C Handbook Supplements H1 Dated March 1963 H4 2 Dated March 1962 6 7 section vi Table 6 3 Code Ne 82209 822143 82376 82389 82847 82865 82877 7853 85953 83058 83086 83125 83148 83186 53258 83315 83330 83585 8359 83594 83746 83777 8382 8417 84395 4411 84970 85454 85471 B5474 85660 85911 85197 6579 86684 87218 81873 87664 58149 TABLE Manufacturer Address Maguire industries Inc Sylvania lecttic Prog ine Electronic Tube Dev Astran Co Switcherafb lac
13. SEMICON DEVICE DIODE SILICON 1901 0025 1902 0025 SEMICON DEVICE DIODE ZENER 10V 1902 0025 1902 0078 SEMICON DEVICE DIODE ZENER 14 7V 1902 0078 2100 0090 R VAR COMP 2000 OHM 30 LIN 1 3W 2100 0090 2100 0151 R VAR COMP 5000HM 20 LIN 1 5 2100 0151 3101 0033 SWIETCH SLIDE DPOT 115 230V 4633 3101 0070 SWITCH SLIDE DPOT 126 8 5000 0025 BODY CABINET 5000 0025 5000 0101 COVER CABINET SIDE 5000 0101 5060 0213 FRAME CABINET SIDE 5060 0213 9100 0183 TRANSFORMER POWER 9100 0183 F FRM RF FPR RRR FRE Re 9170 0016 SHIELDING BEAD 9170 0016 See introduction to this section 6 6 01682 2 Model 1111A Section VI Table 6 3 TABLE 6 3 CODE LIST OF MANUFACTURERS The following code numbers are from the Federal Supply Code for Manufacturers Cataloging Handbooks H4 1 Name to Code and H4 2 Code to Name and their latest wi s The date of revision and the date of the supplements used appear at the bottom of each page Alphabetical codes Code Ne 0006 60135 00334 00335 56373 90658 0 75 0781 Git 9271 03508 63705 93797 93872 05888 03954 04905 04962 04222 04238 04404 2631 0413 04712 04773 9617 1196 04876 05606 527 95347 05553 5728 05729 05783 06004 96175 06402 6555 06751 06812 07415 e3 3 87138 0161 Monufacturer Address U S A Commot Asy supplier of U 3 cCoy Electroares Mount Hoily Secings Pa Deor Calf Rew York N Y Kemidar Co West
14. UF 480 202 50VDCW 56289 5C50A 6 0160 0128 C FXD CER 2 2 UF 20 25VDCW 56289 5015 1 0180 0049 C FXD ELECT 20 UF 50VDCW 56289 033909 1 0180 0059 C FXD ELECT 10 UF 4100 1056 25VOCW 56289 300 1068 025 2 0180 0076 C FXD ELECT 20 UF 25VDCW 56289 400 181 0180 0104 C FXD ELECT 200 UF 15VDCW 56289 300 174 AL vq 0180 0138 C FXO ELECT 100 UF 100 10 4OVDCW 56289 036254 2 0370 01 O4 KNOB SENSITIVITY 28480 0370 0104 La 0683 1025 R FXD COMP 1K OHM 5 1 4W 01121 CB 1025 i 0685 1035 R FXD COMP 10K OHM 5 1 4W 01121 08 1035 l 0685 1225 R FXD COMP 1 2K OHM 5 1 4W 01121 CB 1225 E 0683 1235 R FXD COMP 12K OHM 5 1 4W 01121 CB 1235 q 0683 1515 R FXD COMP 150 OHM 5 1 AW 01121 CB 1515 LL 0683 2015 R FXD COMP 200 OHM 5 1 4W 01121 CB 2015 1 0683 2425 R FXD COMP 2400 OHM 5 1 4W 01121 CB 2425 E 0683 2705 R FXD COMP 27 OHM 5 1 4W 01121 CB 2705 Pit d 0683 2725 R FXD COMP 2 7K OHM 5 1 4W 01121 CB 2725 i 0683 3325 R FXD COMP 3 3K OHM 5 1 4W 1121 C8 3325 Fx c O682 3625 R FXD COMP 3 6K OHM 5 1 4W 01121 CB 2625 1 06835 4715 Ri FXD COMP 470 OHM 5 1 4W 01121 CB 4715 1 0685 5125 R FXD COMP 5 1K OHM 5 1 4W 01121 CB 5125 xd 0683 8225 R FXD COMP 8 2K OHM 5 1 4W 01121 CB 8225 Ra 0686 2015 R FXD COMP 200 OHM 5 1 2W 01121 EB 2015 1 0687 1021 R FXD COMP 1K OHM 10 1 2W 01121 EB 1021 l 0687 1821 R FXD COMP 1 8K OHM 10 1 2W 01121 EB 1821 2
15. an increase in the series loading effect due to the probe whichincreases as the square of the number of ioops Also the looped wire itself adds inductance and shunt capaci tance to ground which may be significant at high frequencies 3 9 SUMMING CURRENTS The probe may be clipped around wires carrying different currents as well as around loops of the samewire In either case the instantaneous output of the probe is the algebraic sum of the instantaneous currents through the probe In this way currents may be balanced in push pull circuits for example by clipping the probe around two wires in which the currents are 180 out of phase as they pass through the probe and adjusting the circuit for minimum output from the probe 3 10 EFFECTS OF EXTERNAL FIELDS Theprobe is magnetically shielded to minimize the effects of external magnetic fields However strong fields near power transformers or electric motors may cause an unwanted output from the probe and amplifier To check for such fields hold the probe with jaws closed and no wire through it in the region in which you intend to make the measurement If the probe output is excessive compared to the expected measure ment make the measurement at some other point along the wire farther from the sourceof the field or Orient the probe lead for minimum undesired output If there is little or no output from the probe and amplifier the field will not affect the measurement 3 11
16. correct proceed to step e if not proceed to step g e Check bias voltages within the amplifiers If biases are considerably off in the input amplifier check Qi Q2 Q3 and CR Also check for proper switch contacting If trouble persists proceed to step f If all biases are right clip the probe ona Sinusoidal current of about 60 ma 30 kc Set sensitivity to 10 MA CM X1 Then trace the signal using a 10 1 scope probe from Q3 collector through Q4 and Q5 to the output Signal voltages within the input amplifier are small and not significant for troubleshooting If biases are right and C4 is good the input amplifier should work g If the 41 5 or 6 5 volt supplies are in error measure total voltage from 6 5 to 7 5 volts with a floating ungrounded dc voltmeter This voltage Should be 14 volts 1 volt and it should not change visibly from 102 to 128 voit ac line voltage If above 15 volts dc check regulator transistor Q6 and breakdown diode CR10 If below 13 voits proceed to Step h If between 13 and 15 volts power supply is operating correctly proceed to step j h Check unregulated dc voltage across Cl black and white wires with a floating ungrounded de voltmeter At 115 volts ac line this should read approximately 20 to 30 volts de Iflow check current through R47 with a de milliammeter The current Should be about 37 to 50 ma If above 50 ma proceed to step k If below 37 ma with low unregulated voltage
17. define differences between other instru ments and the Model 1111A described herein If the change sheets are missing your Field Engineer can supply the information SECTION I PREPARATION FOR USE 2 1 INCOMING QUALITY CONTROL INSPECTION 2 2 MECHANICAL INSPECTION Upon receipt of your Model 1111A check that the contents are intact and as ordered Inspecttheinstrumentforany damage incurred in shipping H the instrument is damaged notify the carrier immediately refer to the warranty which appears on the inside back cover of this manual 2 3 PERFORMANCE CHECK Check the perfor mance of the Model 1111A by making the tests as out lined in Paragraph 5 4 of this manual This check may be used to verify instrument specifications and as part of an incoming quality control inspection 2 4 AC POWER CONSIDERATION 2 5 POWER REQUIREMENTS 2 6 The Model 1111A requires an AC power sourceof 115 or 230 volts 10 single phase 50 to 1000 cps The power required is approximately 1 5 watts The Model 1111A is normally shipped from the factory for use from a 115 volt power source To convert the instrument for use from a 230 volt source slide the 115 230 switch to the 230 position This switch is located on the power plug assembly 2 7 THREE CONDUCTOR CONNECTOR 2 8 To protect operating personnel the National Electrical Manufacturers Association NEMA re commends that the instrument panel and cabinet be 0186
18. information about making measurements using the Model 1111A with the Model 1110A Current Probe While most of the considerations relate to the Model 1110A the information is provided here since the two instruments are designed for use together 3 7 DIRECTION OF CURRENT FLOW The arrow on the probe body indicates the direction of conven tional current flow which produces a positive output from the probe and amplifier Thusthereis a sense of polarity when observing current waveformsonthe I 1 i HEA A 2 b Operation Procedure Connect Model 1110A probe to PROBE input Set MA CM to desired sensitivity Set to X1 for 1 ma cm to 50 ma cm range Set to X100 for 100 ma cm to 5 amp cm range Connect OUTPUT TO 50 MV CM to oscillo Scope input Set oscilloscope vertical sensi tivity to 50 mv em Clip probe around current carrying conductor Observe indication on oscilloscope Figure 3 1 Front Panel Description and Operation Procedure 01862 1 3 1 Section HI Paragraphs 3 8 to 3 15 oscilloscope and the polarity can be reversed by removing the probe from any wire rotating the probe 180 and clipping it around the wire again 3 8 INCREASING SENSITIVITY The sensitivity of the probe may be increased by looping the wire through two or more times The increase in sensitivity is directly proportional to the number of loops ie 2 loops twice sensitivity However the increase in sensitivity is accompanied by
19. of Contents List of Illustrations and Tables Replacing Etched Circuit Board lt 8 4 w s 9 he 098 9 t 9 sq 4d 9 8 09 4 a a c s 4 9 1 eo 8 4 9 s 3 4 5 4 h 4 e a 4 a 4 9 q a s 9 amp t a 4 c5 oo q t t s a ee q lt co 4 amp 04 o 09 9 t a c3 4 t 9 c5 n s 4 gt 9 4 q a 34 v 0 0 amp Excessive Square Wave Sag 9 a 09 w t a 6 t 9 09 s q 9 5 ea o r 55 a w 4 c 3 4 te 059 sn ko 2 iii Section I Figure 1 1 and Table 1 1 Model 11114 Figure 1 1 Model 1111A AC Current Amplifier i Table 1 1 Specifications for Model 1111A with Model 1110A Probe SENSITIVITY 1 ma cm to 50 ma cm in X1 100 ma cm to 5 amps cm in X100 1 2 5 sequence for X1 or X100 ACCURACY 3 on X1 sensitivity 4 on X100 sensitivity BANDWIDTH 50 cps to 20 Mc RISE TIME 18 nsec NOISE Less than 100 pk pk referred to input 1 0 MAXIMUM AC CURRENT Above 700 cps 50 amps pk pk Below 700 cps decreases at 1 4 amps 20 cps OUTPUT IMPEDANCE 50 ohms DIMENSIONS 1 1 2 in high 5 1 8 in wide 6 in deep WEIGHT Approximately 2 lb POWER 115 or 230 volts 10 50 to 1000 eps 1 5 watts 01862 1 Model 1111A Sections I an
20. to Hewlett Packard Company for servicing or repair attach a tag to the instrument specifying owner desiredaction model number and serial number Ship the instru ment to Hewiett Packard Customer Service at the address on the warranty page All correspondence Shouid refer to an instrument by model number and the full eight digit serial number 01862 1 Model 1111A Section HI Paragraphs 3 1 to 3 7 SECTION Ill OPERATING INSTRUCTIONS 3 1 INTRODUCTION 3 2 The Model 1111A provides amplification of the output of the Model 1110A Probe and calibrated control of the sensitivity Front panel controls set the sensitivity in milliamperes centimeter whenused with an oscilloscope with 50 mv em sensitivity 3 3 PANEL DESCRIPTION AND OPERATING PROCEDURE 3 4 Figure 3 1 a provides a brief description of front panel controls and connectors keyed by number to the panel illustration A step by step operating procedure is provided in Figure 3 1 b Additional operating considerations are given in Paragraph 3 5 OUTPUT TO 50 MV CM AC CURRENT AMPLIFIER HEWLETT PACKARD MODEL HHA a Panel Description PROBE Input connector for Model 1110A Probe MA CM Sets deflection sensitivity of oscil loscope trace in milliamperes cm X1 X100 Changes sensitivity of MA CM OUTPUT TO 50 MV CM Connects output of amplifier to oscilloscope 3 5 OPERATING CONSIDERATIONS 3 6 GENERAL The following paragraphs contain
21. volts and frequency control to about 400 kc 315i 4 PROBE T Corer Gp 10207A 9 puna Figure 5 4 Rise Time Check Setup 5 3 Section V Paragraphs 5 14 to 5 18 Figure 5 5 Pulse and High Frequency Response Test Setup c Set Model 1111A sensitivity to 1 MA CM d Set Oscilloscope and plug in controls as follows TIME SCALE to 200 NSEC CM TIME SCALE MAG NIFIER to X2 TRIGGER SLOPE to SENSITIVITY to 200 MILLIVOLTS CM and SCANNING control to INTERNAL e Adjust controls to obtain a good display of the positive pulse f Set Pulse Rounding Adjust R14 for best leading edge on square wave g Adjust C6 for best leading edge h Set sensitivity control to 2 MA CM X1 i Adjust C13 for best leading edge j Set sensitivity control to 5 MA CM k Adjust C12 for best leading edge m Set sensitivity to 10 MA CM n Adjust C11 for best leading edge p Check pulse response on all ranges and make compromise readjustments if necessary 5 14 TROUBLESHOOTING 9 15 CIRCUIT VOLTAGES 5 16 The schematic diagram Figure 5 9 gives typical dc voltages and ac waveforms for trouble Shooting Conditions of measurement are listed on page 5 8 9 4 Model 1111A 9 17 NO OPERATION a Check ae power b Be sure X100 attenuator has not inadvertently been switched in c Check Model 1110A probe separately d Measure 47 5 and 6 5 volt supplies If
22. 13 OUTPUT AMPLIFIER 4 14 Following the input amplifier is a voltage divider emitter follower and straight common emitter output amplifier in that order The voltage divider is used to reduce the gain for the 20 MA CM and 50 MA CM ranges rather than further reduction of feedback resistance in the input amplifier The output stage emitter resistor R34 is unbypassed except for R35 and C19 which are switched in to compensate frequency response on the 1 and2MA CM ranges against stray capacities Calibration is set by R40 which forms a current divider with R41 Output impedance is 50 ohms so the Model 1111 will drive any length of 50 ohm cable with flat re sponse independent of termination 4 15 POWER SUPPLY 4 16 The supplies although labelled 7 5 and 6 5 are actualiy generated by one floating 14 voit regulated supply The split to 47 5 and 6 5 is done by Q4 and Q5 in the final amplifier The total 14 volt supply is tapped by R32 and R38 which places the base of Q4 approximately centered on the supply Transistors Q4 and Q5 then act as dc emitter followers to solidly place ground at 7 5 volts from the positive end of the Supply and 6 5 volts from the negative end 4 17 Resistor R33 200 ohms is really the emitter resistor for Q5 and sets the dc current in Q5 but has no effect on the voltage split between the positive and negative supplies 4 18 When the interstage attenuator is switched in on 20 and 50 MA CM
23. 2 1 grounded This instrument is equipped with a three pin power plug which when plugged into an appropriate receptacle grounds the instrument The offset round pin on the plug is the ground connection To retain the protection feature when operating the instrument from a two contact outlet use a three conductor to two conductor adapter and connect the adapter wire to ground 2 9 RACK INSTALLATION 2 10 The Model 1111A may be placed in a 1051A combining case which may then be installed in an instrument rack The Combining Case may also be mounted in the rack space of a 4 Model 1117A Test mobile for convenience of keeping related use instru ments together the 1051A also adapts 1 3 width modular instruments to a rack 2 11 REPACKAGING FOR SHIPMENT 2 12 The following is a general guide for packaging an instrument for shipment Ifthereareany questions regarding packaging methods contact your Hewlett Packard Fieid Office a Wrap the instrument in heavy paper or plastic before placing it in the shipping container i 1 2 1 Section II Paragraph 2 13 b Use plenty of packing material around all sides of the instrument and protect surfaces with cardboard strips e Place the instrument ina heavy cardboard carton or wooden box Seal the container with heavy tape or metal straps d Mark the packing container FRAGILE DELICATE INSTRUMENT 2 2 Modei 1111A 2 13 If an instrument is being returned
24. 6K OHM 5 1 4W i RAO 2100 0151 R VAR COMP 500 OHM 20 LIN 2 10W R41 0727 0021 R FXD DEPC 60 OHM 1 1 2W R42 THRU RA NOT ASSIGNED i R45 0687 1821 R FXD COMP 1 8K OHM 10 1 2W I R46 0687 1821 R FXD COMP 1 8K OHM 10 1 2W R47 0760 0027 R FXD MET OX 150 OHM 2 1W R48 0687 1021 R FXD COMP 1K OHM 10 1 2W 51 3101 0033 SWITCH SLIDE OPDT 115 250V S2 35101 0070 SWITCH SLIDE DPDT 3 N S R PART OF A3 Ti 9100 0185 TRANSFORMER POWER ii See list of abbreviations in introduction to this section 01862 2 6 3 Section VI Table 6 1 Reference Designati on wi 01111 61601 5000 0025 5000 0101 5060 0215 1205 0011 02570 0104 01111 00201 01111 46101 CABLE POWER BCDY CABINET COVER CABINET SIDE FRAME CABINET SIDE HEAT SINK KNOB SENSITIVITY PANEL TERMINAL BOOT CABL Model 1111A Table 6 1 Reference Designation Index Cont d 45 Stock No Description MISCELLANEOUS E z See list of abbreviations in introduction to this section 6 4 01862 2 Model 1111 Section VI Table 6 2 Table 6 2 Replaceable Parts Description 0121 0027 C rVAR CER 7 25 PF N300 0121 0027 2 0122 0005 C VAR POLY 7 2 0 PF 350VDCW 72982 535 031 4R 1 0150 0075 C FXD CER 100 PF 10 500VDCW 56289 40C 200A2 li 0150 0096 C FXD CER 0 05 UF 100VDCW 91418 TA 3 0150 0121 CER 1
25. OPERATING AND SERVICE MANUAL MODEL 1111A SERIAL PREFIXED 422 AC CURRENT AMPLIFIER COPYRIGHT HEWLETT PACKARD COMPANY 1963 t501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A 01862 2 dp Printed JULY 1964 Model 1111A Section Page Section I GENERAL INFORMATION 1 1 V MAINTENANCE 1 1 Description and Applications 1 1 9 1 Test Equipment Required 1 4 Instrument Identification 1 1 5 4 Performance Check II PREPARATION FORUSE 2 1 Incoming Quality Controlinspection 2 1 5 8 Bandwidth 2 4 AC Power Considerations 2 1 5 9 Ri i 9 ise Time 2 5 Power Requirements 2 1 5 10 Adjustments 2 T Three Conductor Connector 2 1 5 11 Amplifier Gain S 2 9 Rack Installation 2 1 n Gal et 9 i R kaginz for Shi t 2 1 5 12 Pulse and High Frequency 11 epackaging for Shipment Response HI OPERATING INSTRUCTIONS 3 1 9 14 Troubleshooting 3 1 Imtroduction Rr A 3 1 5 15 Circuit Voltages 3 3 Panel Description and Operating 5 17 No Operation Procedure 3 1 5 18 3 5 Operating Considerations 3 1 5 19 Excessive Square Wave 3 14 Amplifier Gain 3 2 Overshoot 3 15 Input Impedance es 3 2 e Out of Calibration 9 23 Repair and Replacement IV PRINCIPLES OF OPERATION 4 1 5 24 Component Location 4 1 Introduction l 5 26 4 3 Input Amplifier
26. PEAK CURRENT The maximum peak to peak current which the probe and amplifier will accept is a function of frequency Figure 3 2 shows a plot of peak to peak current vs frequency 3 12 MAXIMUM DC CURRENT The Current Ampli fier and Probe will perform as specified in Table 1 1 if the DC current present is less than 0 5 amps Above 0 5 amperes DC performance is deratedsince the DC current acts to decrease Probe head inductance and to raise the low frequency 3 db point 3 13 HIGH FREQUENCY RESPONSE Performance of Current Amplifier and Probe will be within speci fications if the load capacitance presented to the out put of the Model 11114 is less than 30 pf The high frequency 3 db point is determined by the capacitive load at the input The typical high frequency oscil loscope has an input capacitance of 28 pf hence high frequency operation of the Probe and Amplifier is not affected 3 2 Model 1111A MAX AC CURRENT AMPS p p ama S S m Se io 20 50 i00 200 500 IK 2K FREQUENCY CPS IA AWS Figure 3 2 Peak to Peak Current vs Frequency 3 14 AMPLIFIER GAIN The gain of interest for the Model 1111A is a transresistance or output millivolts per milliampere of current at the input which is the dimension of ohms mv ma ohms Since the input impedance varies somewhat with range and frequency see Paragraph 3 15 this does not correspond to a stable voltage gain E ut En For convenience in u
27. Q4 1850 0075 TRANSISTOR GERMANIUM PNP 2N779A Q5 1854 0019 TRANSISTOR SILICON NPN 2 2268 Q6 1854 0005 TRANSISTOR SILICON NPN R1 0727 0899 R FXD DEPC 5 OHM 2 1 2W R2 0721 0028 R FXD DEPC 48 7 OHM 1 1 8W R3 NOT ASSIGNED R4 0699 0001 R FXD COMP 2 7 OHM 10 1 2W i RS 0683 2825 R FXD COMP 2400 OHM 5 1 4W R6 0682 1025 R FXD COMP 1K OHM 5 1 4W R7 0685 2725 R FXD COMP 2 7K OHM 5 1 4W I R8 0683 1225 R FxD COMP 1 2K OHM 5 1 aW RQ AND R10 NOT ASSIGNED R11 0683 3325 R FXD COMP 3 3K OHM 5 1 4W R12 i 0683 1235 R FXD COMP 12K OHM 5 1 4W R13 0683 2705 R FXD COMP 27 OHM 5 1 4W I R14 2100 0090 R VAR COMP 2000 OHM 30 LIN 1 3W R15 0683 2015 R FXD COMP 200 OHM 5 1 4W i R16 0682 5125 R FXD COMP 5 1K OHM 5 1 4W R17 0683 4715 R FXD COMP 470 OHM 5 1 4W R18 AND R19 NOT ASSIGNED 20 x 0727 0116 R FXD DEPC 2 03K OHM 1 1 2W R21 0727 0100 R FXD DEPC 1K OHM 1 1 2W R22 0727 0072 R FXD DEPC 403 OHM 1 1 2W R23 0727 0055 R FXD DEPC 201 OHM 1 1 2W x R2 amp THRU R27 NOT ASSIGNED i i R28 0727 0025 R FXD DEPC 50 OHM 1 1 2W R29 0727 0055 R FXD DEPC 201 OHM 1 1 2W i R2O AND R31 NOT ASSIGNED R32 0685 1035 R FXD COMP 10K OHM 5 1 4W R32 0686 2015 R FXD COMP 200 OHM 596 1 2W R34 0727 0709 R FXD DEPC 15 4 OHM 5 1 2W R35 0685 1515 R FXD COMP 150 OHM 5 1 4W R36 AND R49 NOT ASSIGNED R38 0683 8225 R FXD COMP 8 2K OHM 5 1 4W R39 0683 3625 R FXO COMP 3
28. T BOARD COMPONENTS 5 27 The etched circuit board assembly A101 has components on one side of the board and the etched circuit conducting paths on the opposite side The connection between sides of the board is completed by a plated conductive layer of metal through component holes Hewlett Packard Service Note M 20D aiso contains useful information on etched circuit repair The important steps and considerations are a Use a low heat 37 to 47 5 watts less than 800 F idling temperature slightly bent chisel tip 1 16 to 1 8 inch diameter soldering iron and a small dia meter high tin content solder If a rosin solder is used ciean the area thoroughly after soldering b Components may be removed by placing the Soldering iron on the component lead on either side of the board and pulling up on the lead H heat is applied to the component side of the board greater care is required to avoid damage to the component especially true for diodes If heat damage may occur grip the lead with a pair of pliers to provide a heat sink between the soldering iron and component 2 5 Section V Paragraph 27 cont d c If component is obviously damaged or faulty clip the leads close to the component and then unsolder the leads from the board d Large components such as potentiometers and tube sockets may be removed by rotating the soldering iron from lead to lead and applying steady pressure to lift the part free the alternative
29. ackard V m b H Hewlett Packard Beneiux 20 24 Rua de l Hopitai Brussels Tei 11 22 20 aM MENT 33 Hamburg 24 95 France Kurhessenstrassa 95 Frankfurt am Main Tet 52 00 36 Hewlett Packard France Boulevard Massena 150 Paris 36 m Tal 707 37 19 dr ir 13 Portugal Tei 44 51 21 TELECTRA Austria Hewlett Packard S A Geneva Rua Rodrigo da Fonseca 103 P O Box 2531 Lisbon I Tei 68 9 5 68 Yugosiovia 58 60 74 Befram Electronics 83 Av das Mimosas Brussels 15 Seigium Tel 35 29 58 t Turkey TELEKOM Enqinaering Bureau P O Box 374 Galata Istanbul Tal 49 40 40 Spain ATAIO Ingenieros Italy EA Switzerland Greece ite a 8 Madrid 15 Dott ing Mario Yianella Man raul ay K Karayannis el AT 1 1 yi Wankdorffeldstrasse 66 Bern Kiaffmonos Squete Athens 124 223 41 7 and 224 84 97 Te Sed Oat and 552 811 Tel T sU ae Rome Tol 931 42 00 78 Tel 230 301 S Lines Argentina India t New Zealand Mauricio aposta The Scientific instrument Company Ld Telecom Ltd on N 2 Led Carlos Calvo 224 Buenos Aires Taj Bahadur Sapru Road Allahabad P O Box 1812 Tehran atipo Stree Tel 30 6212 Tal jas s mi 48111 E 5 Auckland Australia 240 Dr Dadabhai Naorojl Road acfroni ineering Ltd Sample Electronics Pty Ltd Tambay i acd ptis i Puerto Rico amp Virgin Islands Ril el 2642 Tel 35021 3 fines gd inc Richmond E Victor
30. cilloscope and plug in Bandwidth 50 Mc Sensitivity 05 v em 99 Model 175A and Model 1751A Check noise Square Wave Generator Frequency 400 Ke Rise Time 3 nsec Output 0 5 volts into 509 Adjust pulse and high frequency response Tektronix Model 107 Square Wave Generator Special Loads 50 2 5040 5 Resistor 600Q See Figure 5 1 22 PF Capacitor and BNC connector See Paragraph 5 3 01862 1 5 1 Section V Paragraphs 5 6 to 5 8 RESISTOR GOON I 1 2W STK NO eT MUS lt i gt RESISTOR J fe Q 0 1 1 2 DUAL BANANA PLUG CONNECTOR dip STK NO 1251 0005 KHIOA A S Figure 5 1 Special 600 Q Load 5 6 SENSITIVITY AND ACCURACY a Refer to Table 5 1 and Figure 5 2 and connect test equipment Items required are 2 3 4 and 9 b Set Voltmeter range to 0 1 volts c Set Oscillator frequency to 50 kc d Disconnect Voltmeter from Model 1111A output and reconnect Voltmeter across the 600 Q load e Set Oscillator output for a Voltmeter reading of 0 1 volts f Disconnect the Voltmeter from the load and reconnect it to the Model 1111A output g Set the Model 1111A sensitivity to 1 MA CM h Check Model 1111A output according to Table 5 2 i Disconnect Voltmeter from Model 1111A output and reconnect it across the 600 Q load j Set the Oscillator output for a Voltmeter reading of 1 0 volts k Disconnect the Voltmete
31. ction a is approxi mately numerically equal to the feedback resistor in ohms As the resistor is changed to smaller values more bias current is required to provide adequate maximum output voltage For this reason R6 and R7 are switched in to reduce the Q1 collector load 4 10 DC BIASING 4 11 The dc voltages and currents are set as follows the base of Q2 operates at about 7 0 volts constant 0 5 volt base emitter drop from 7 5 volt supply Due to the 10 voit drop across breakdown diode CR7 the collector of Q1 must run at 3 0 volts 10 volts negative from 7 volts Since Qi collector is at 3 volts R5 has 6 5 volts at one end and 3 volts at the other and so has 3 5 volts across it This causes a current of 3 5 2400 or 1 4 mato flow in R5 The 1 4 ma dc current flows 99 through Q1 collector and 1 through Q2 base due to the current gain of 100 in the cascode amplifier and gain of unity in Q1 About 0138 ma in Q2 base causes about 1 38 ma in Q3 collector which then flows through R20 and Q1 and joins with the 0138 ma base current to make the i 4 ma in R20 Thus for a given set of dc voltages R5 sets the current in all three transistors and R20 affects only the de voltage at the cascode amplifier output which must be between 7 volts and ground for proper operation of the cascode stage 4 12 Resistor R11 is switched in on the two most Sensitive ranges to augment the bias current in Q2 4 2 Model 1111A 4
32. cuit board picofarads 1071 farads peak to peak peak inverse voltage porcelain position s polystyrene potentiometer rectifier rotary root mean square rack mount only Nux lt S B SECT SI SIL SL SPL TA TI TOG TOL TRIM TWT U VAC VAR w w o H Hp H H H n n H H H H H W H H H H h B B H H H H I iF vacuum tube neon bulb photocell etc cable socket crystal network slow blow Selenium section s Silicon Silver slide special tantalum time delay titanium dioxide toggle tolerance trimmer traveling wave tube micro 1078 vacuum variable with watts wirewound without optimum value selected at factory average value shown part may be omitted 6 1 Section VI Model 1111A Table 6 1 Table 6 1 Reference Designation Index Fi 1251 0548 Ref ce Designation Description Al 01111 67601 POWER PLUG ASSEMBLY A2 01111 66502 AMPLIFIER ASSEMBLY A5 01111 61902 SWITCH ASSEMBLY 0150 0096 C FXD CER 0 05 UF 100VDCW I C2 AND c3 NOT ASSIGNED O1111 80701 ASSY CAPACITOR 2000 UF C5 0150 0121 C FXD CER O 1 UF 80 2096 50VDCW C6 N S R PART OF A2 0180 0059 C FXD ELECT 10 UF 100 10 25VDCW 8 0150 0121 j C FXD CER 0 1 UF 80 2006 SOVDCW C9 AND C10 I NOT ASSIGNED cii 0121 0027 C VAR CER 7 25 PF NZ00 C12 0121 0037 C VAR CER 7 25 N300
33. d II Paragraphs 1 1 to 2 12 SECTION GENERAL INFORMATION 1 1 DESCRIPTION AND APPLICATIONS 1 2 The Hewlett Packard Model 1111A AC Current Amplifier shown in Figure 1 1 is a stable wide band amplifier to be used with the Model 1110A Probe The Model 1111A amplifies the Probe output extends the low frequency response to 50 cps and provides 12 ranges of sensitivity from 1 ma em to 5 amps em used with 50 mv cm sensitivity oscillo Scope Complete specifications are given in Table 1 1 1 3 The Model 1111A is designed for use with an oscilloscope which has a calibrated vertical amplifier with 50 mv em sensitivity Whenused with this sensi tivity oscilloscope the Model 1111A s attenuator may be read directly in milliamperes per centimeter deflection on the CRT The ModelilllA may be used with an oscilloscope having different sensitivity but the conversion ratio must then be used 1 4 INSTRUMENT IDENTIFICATION 1 5 The Hewlett Packard Company uses a two section eight digit serial number to identify instru ments e g 000 00000 The serial number is located on a plate attached to the instrument rear panel The first three digits are a serial prefix number also appearing on the title page of this manual and the iast five digits identify a specific instrument If the first three digits ofthe instrument Serial number are not the same as those appearing on the title page change sheets included with the manual wili
34. d for the adjustment procedure orto thetroubleshooting component required Figure 5 1illustratesthe 600 2 suggestions of Paragraph 5 14 In the procedures load required The 0 Q load may be made using a using the Model 1110A Probe always be sure the 5040 5 Q resistor and either the dual banana plug head surfaces are clean and that the jaws close firmly Table 5 1 Test Equipment Required Description Important d Recommended p Specifications Equipment Signal Generator Output 1 voit into 50 Q constant with frequency Frequency 50 Kc 20 Mc 2 AC Accuracy 1 Check sensitivity f Model 400H Voitmeter Range 0 1 volts accuracy and bandwidth Current Probe Bandwidth 45 Mc Model 1110A Rise Time 8 nsec Oscillator Check sensitivity f Model 608A accuracy and bandwidth Check sensitivity accuracy and bandwidth Adjust pulse response Output 1 mv ma Range 50 cps 50 Ke Output 1 5 volts into 6002 constant with frequency Check bandwidth Adjust gain Model 200CD Model 411A 49 Model 185B and Model 187B Range 0 1 volts Bandwidth 1 Mc 20 Mc Accuracy 3 full scale Check bandwidth Millivoltmeter Sampling Oscilloscope and plug in Bandwidth 100 Mc Syne Pulse 1 5 volts into 50 2 1 5 nsec risetime Sensitivity 10 mv em Adjust pulse response High Frequency Os
35. gen National Watch Co Electrasics Division Burbank Calif Cymer Mvision of Hewlett Packard Co Palo Alfo Cart Sytvanea Electree Prags Int Elactzonst Tobe Div Mountain View Catif Moloibia laca Semiconductor Prod Dev Phoenix Arizona Fillros Co Ine Western Div Cuiver City Gal Avlomatic Etectiic Co Noirthiake 11 Agtomalic Cleclric Sales Carp Haorhiake li Sequa a Wire amp Cable Co Redwood City Calif P M Molo Comsany Chicago 44 Ill Twenteeth Ceatuty Plaslics inc Los Angeles Catif Weslinghause Electiz Corp Semi Conductor Dept Ulieonix fac IUsmilioait Eagineeting Co Barber Colman Co Titfen Satical o Roslyn Heighis Long island N Y Metropoirlan Teiecammumeations Sorg keks Cap Division N Y Stewart Engineering Co Santa Croz Calif The dassick Co Bridgeport Cann Ba sth anc Lomb Optical Co Rochester 8 Y E T A Products Co America Carcaga Ill Beede Electrical instramant Co Ine Penacook N R U Semas Division of Nuclear Carp of America Phoenix Arizona Forringios Mfg Co West Gav Van Nuys Catit Coring Glass Works Electronic Components Dept Sigitran Co Transistor Electronics Cars Westinghouse tectic Cots Elecuonie Tube Div Avnel Cate Youngwood Pa San Mates Cai Sunnyvaie Calf Rockford ff Bradiond Pa Pasadena Caiit Minneapolis Mise Elma X Y Los Angeles Calif 01862 2 Monufacturer Address
36. ia li Esplanade East Calcutta japon Pha de tare Sta San Juan Tel 42 4757 3 lines Tel 23 4129 Yokogawa Hewiet Packard Ltd Tet 722 3342 724 4406 M j Nakacho Musashino shi Tokyo Sah Sydney M Mgr feet Madran 2 tet Ogitsbe NL n on ee oci Tal 69 6336 5 lines 04221 2 3701 Maore o du Pta 5 7 Aimeri Gafa Extn New Delhi i K Buitencingle Street Cape Town Tel 271053 American Trading C K Ltd Tel 3 3817 ican Trading Company Korea i FOR SALES AND SERVICE ASSISTANCE Song Building 112 35 Sokong Donq 5 Taiwan Formosa IN AREAS NOT LISTED CONTACT Se ul P O Box 1105 Hwa Sheng Electronic Co Ltd anking West Road Taipei International Marketing Departmant det 37613 Tel 4 6076 4 5936 Hewlett Packard Company 150i Page Mill Road Palo Alto California 94304 U S A Telephone 415 326 7000 TWX 415 492 9200 Telex 033811 Cable HEWPACK indicates Instrument Repair Stations MARCH 1964 SA Qs z NES T mee POSSEM UAE e d n DEAD z Ud
37. iectnc Co North Adams Mass cf Cinch Mfg Corp Chicago Hi Tetex Inc t Paul iaa 15378 james Knights Co Sandwich Hi Thomas Beils Co Elizabeth 1 4 75382 Kulga iectr c Corparation Mt Verona Tupoiett Etectrical Inc Ohio T5818 kem Electric Mfg Co Chicago HI gaion Swaleh and Signal Div af 78515 LitHeluse lac Des Ptaimes Ill Wesliaghouse Ait Brake Co Swissvaie Pa 78005 Lord Mfg Co Erie Pa Universa Etectsic Co Owosso Mich 76750 C W Marwedei San Francisco Calif War Leonard Electric Co St Vernon N Y 76433 Micamolt iecttonic Mfg Corp Brooklys N Y Westers Electric Co Inc New York N Y 16481 James Millen Mfg Co tec Malden Mass Weston lust Div of Daystrom inc Newark N S 164935 J W Miller Co Los Angeies Calif Witiek Maaufacturag Co Chicago 23 lH 76536 Monadnock Mitis San Leaadro Catit Wellensak Optica Co Rochestet 75343 Mueller Electric Co Cleveland Gro Alles Mig Ca Hartford Conn 16856 Dak Manufacturing Co Crystal Lake il Allied Control o Inc New York N Y Bendix Pacific Division af Altmetat Screw Prod Co inc Sen ix Corp No Hollywood Calif Garoen Cay N V 11015 Pachic Metais Co San Francisco Calif Atlantic india Rubber Works Inc Chicago HI 1331 Phaosan Instrument and Ampetite Co inc New York N Y Electeanic Co South Pasadena Catif Beiden Mfg Co Chicago Ill HO s Chicago Th Bud Electr
38. ing Voits 0 1 3 0 05 3 0 02 3 0 01 3 0 005 305 0 002 3 01862 1 Model 1111A Figure 5 3 Signal Generator RF Millivoltmeter Test Setup g Repeat procedure starting with step b using appropriate Voltmeter range and checking other Model 1111A sensitivity ranges h Disconnect test setup Refer to Figure 5 3 and Tabie 5 1 and connect test equipment specified using items 1 3 5 and 9 i Set Model 1111A sensitivity to 1 MA CM X1 j Set the Millivoltmeter range to 0 1 voits k Set the Signal Generator frequency to 1 Mc and the output amplitude for a zero db reading on the Millivoltmeter m Set the Signal Generator frequency to 20 Mc n Millivoltmeter reading should be 3 db or greater p Repeat procedure starting with step j using appropriate Millivoltmeter range and checking the other Model 1111A sensitivity ranges 5 9 RISE TIME a Refer to Table 5 1 and Figure 5 4 and connect specified equipment items 3 6 and 9 The 50 load is connected to the oscilloscope syne pulse output b Set Oscilloscope MODE to FREE RUN and switch on SYNC PULSE c Set Model 1111A sensitivity to 1 MA CM d Adjust Oscilloscope and plug in SENSITIVITY TIME SCALE and MAGNIFIER controls to display leading edge of pulse e The rise time between 10 and 90 amplitude points should be 18 nanoseconds or less f Check other Model 1111A sensitivity ranges for the same rise time specificati
39. input signal current ig flows through R20 and because the input emitter is very close to ground potential the output from Q3 is a voltage equal to 99i R20 which is almost independent of transistor parameters If current gain of the cascode amplifier were to drop to 50 a 2 1 change then 9875 of the input signal current would flow through R20 and gain would changeonly 1 4 8 Capacitor C6 is used for high frequency gain Stabilization by introducing a local negative feedback loop around the cascode amplifier This capacitor reduces the total effect of transistors Q2 and Q3 and all their stray capacitances to that of a single 6 db octave gain slope at high frequencies The gain crossover frequency at which gain 1 ofthe cascode amplifier is adjusted by varying this capacitance The proper setting is determined on the basis of optimum CASCODE AMPLIFIER TO OUTPUT AMPLIFIER Figure 4 1 Simplified Input Amplifier Schematic 01862 2 Section IV Paragraphs 4 9 to 4 18 overall transient response overshoot and rise time Pulse Rounding Adjust R14 varies the collector voltage of the lower half of the cascode amplifier altering the high frequency response of the local feedback loop Adjustment is made for optimum pulse response 4 9 Sensitivity range is changed by switching in other values of feedback resistance R20 in Figure 4 1 Since about 99 of input signal current flows in the E feedback resistor the gain fun
40. isco Calf galla a Neb Sioomergton Ind Beortoe N J Saa Francisco Calf San Francisco Catit New Haven Cosa Harrison H J Lansdaie Pa Van Waters amp Rogets Inc Cutier Hammet inc 6 8 6 3 Cade Ne 88220 8693 8923 39473 33636 89565 90179 90970 31260 91345 91418 91506 31637 31682 931717 9 827 91929 92196 3236 32687 3323 33363 93419 33738 92979 3383 5114 34185 91158 94154 95137 34222 4319 94682 95023 35236 00015 35 Revised CODE LIST OF Manufacturer Address Sogid Nalional Batteries lac t Paul Minn Gerteral Miils lac Buffalo N Y Stayhar Eeri Co Qaslane Calif Senetal fectric Gistributiag Corp Scheneclady Y Carter Parts Gav af Economy Balet Co Chicago lii Chicago Hl United Trassformer Co U S Rubber Co Mechaaical Goods Div Bearing Engineering Co Connor Spring Mfg Co Milier Oral Hameniate Co Radio Materials Co Augat Brothers inc Date Electronics inc Eico Carp Passaic 4 4 San Francisco Calif San Francisco Calif Ei Monte Calil Chicaga 113 Attleborc Mass Catembus Nebr Philadelphia Pa Gremar Mfg Co int Wakefield Mass X F Deveiopnent Co Redwood City Calit Misseapotis Honeywell Regulatar Co Microswite Div Freeport Hi Universal Retai Prod fac Basseti Puente Catil Eigeet Optical Co Inc Rochester N Y Tisselile Insulated Were Co Tatryt
41. isto clip the leads of a damaged part e Since the conductor part of the etched circuit board is a metal plated surface covered with solder use care to avoid overheating and lifting the conductor from the board A conductor may be cemented back Model 1111A in place with a quick drying acetate base cement use Sparingly having good insulating properties Another method for repair is to solder a section of good conducting wire along the damaged area f Clear the solder from the circuit board hole before inserting a new component lead Heat the solder in the hole remove the iron and quickly insert a pointed non metallic object such as a toothpick g Shape the new component leads and clip to proper length Insert the leads in the holes and apply heat and solder preferably on the conductor side 18 Figure 5 8 Etched Circuit Board Components 5 6 01862 2 Model 1111A Section V Table 5 4 Table 5 3 Calibration and Component Replacement Record For Hewlett Packard Company Model 1111A Current Amplifier Instrument Serial No CALIBRATION Date Description of Calibration Made Paragraph Procedure s Used COMPONENT REPLACEMENT Nature of Failure 01862 1 9 7 Section V Model 1111A CONDITIONS OF MEASUREMENT DC Measurements Sensitivity set to 10 MA CM X1 Waveform Measurements a b 5 8 Sensitivity set to 10 MA CM X1 For Test Points 1 through 4 clip curren
42. nductor lac Newport Seach Calif 13103 Trermottoy Dallas Texas 13396 Yeieisnken 1G M B H Haetover Germany 14999 Sem Tech Newbury Fark Calif i4193 Calit Resestor Corp Santa Monica Calif 148298 American Comporents Isc Coasnohocken Pa 14655 Cornell Subitier Elec Corp o Piaietiel N J j5909 The Daven Co Liviegsion N J 16688 De Juz Ainseo Corporation Long 5 8514 Cay i N Y 16758 Delco Radio Div of G M Corp Kokama Ind 18873 E t DePont and Co inc Wilmragion Dei 19315 Eciipse Pioneer Div of Sesd r Aviation Cora Teterbero J 9500 Thomas A Edisen ladustties Div of McGraw Edison Co West Orange N 7 1970 Electa Manutactertng C Kansas Cily Mo 20183 Tube Corp Philadeiphia Pa 21226 Executive lac Kew York N Y 21520 Fasstee Metaiturgical Corp No Chicago Hi 21335 fe Fafmr Bearing Co New Grain Conn 21964 Fed Telephone aad Radio Cars Cites 24446 Geseral lectric Co Scheneciady N Y 24455 G Lamp Division Hela Park Cleveland Ohio 236895 General Radio Co West Concord Mass 16365 Gries Repiodacei Corp New Rachelle N Y 26462 Groved Fria Co of America Inc Caristsdt N F 28952 Hamslion Walch Co Lancaster Pa 28480 Hewlett Packard Co Paio AHo Galit 33122 G E Receiving Tube Seal Owensdora Ky 35434 Lectrohm Inc Chicago ILE 37942 P R Mallory o fac Indianapolis ind 39543 Mechanica industries Prod Co Akron Ohio 0920
43. od Calif 19900 Winchester Electronics Ise Sania Monica Cait 1096 Mateo Tool and Die Los Angeles Calif CIIM Western Coit Div sf Automatic ind lnc Redwood City Caiif D09098 Nahm Bros Spring Co San Leandro Cali 99900 U S A Commas Any suppiser af G 5 Ty Car Mfg Co fac Holliston Mass WIAT Texas tashumeats Inc Metais an Controls Div Versailles Ky COOH Fowes Mfg fore Providence R i QG0GH Webster Electronics Ca fac New York N Y 8000X Spruce Pine Mica Co Spruce Pine N C SOGGY Midsaad Mig Cc Inc Kansas City Kass 9000 Wilkow Leather Products Corp Newark Nj 0GAA British Radic Electronics Lid Washington 0 0 90948 ETA Eagiang QGGAC indiana Generel Elect Div IGAD Curtis instrument Inc M Kisco N Y 9988 Precision Insttumeat Components Co Yaa Nuys Calif 000CC Computer Sicde Core Lodi X J OEE A Williams Masyfacturing o 549 Jase Cait COCGG Goshen Die Cutting Service Geshen lad 00088 Rubbercratt Corp Torrance Calif SOCH Birteher Corporation Industnal Division Monterey Park Calif SCCKK Amatom New Rochelle N Y DILE Avery Label Mearovia Calif SCUMM Rubber Eng amp Deveibpment Haywait Calif 00NN A N Manufactunag Co Sam Jose 27 Calif 8065 Atohm Electronics Sun Valley Caiif 900QQ Cooltron Dakiang Calif 90454 Radio induslties Ges Plaines Ilf GGSS Castrol of Elgin Walth Co Burbank Calif Q60WW Calsfornia Easten Leb Busling
44. on 01862 2 Section V Paragraphs 5 9 to 5 13 5 10 ADJUSTMENTS 9 11 AMPLIFIER GAIN SET a Refer to Table 5 1 and Figure 5 2 and connect Specified equipment items 2 3 4 and 9 b Set Oscillator frequency to 50 Kc c Set Model 1111A sensitivity to 1 MA CM d Disconnect Voltmeter from Model 1111A output and reconnect Voltmeter across Oscillator output e Set Oscillator output for reading of 0 1 volts f Reconnect Voltmeter to Model 1111A output g Adjust R40 for Voltmeter reading of 0 1 volts h Refer to Table 5 2 to check the Model 1111 output on other sensitivity settings 5 12 PULSE AND HIGH FREQUENCY RESPONSE 5 13 The adjustments for pulse and high frequency response will have some interaction requiring repeat of the procedure to optimize the performance When an adjustment affects more than one sensitivity range a compromise setting may be necessary The objective for these adjustments is to obtain the best pulse response combination possible this means best rise time within specifications with least ringing and overshoot a Refer to Table 5 1 and Figure 5 5 and connect specified equipment items 3 6 7 and 8 One additional item is required a capacitive load de scribed in Paragraph 5 3 Use a BNC tee connector to connect the capacitive load and oscilloscope probe to the Modei 1111A output b Set the Square Wave Generator amplitude control fully clockwise output approximately 0 5
45. onic Corp Cleveiend Ohio 7 282 Philadelphii steel dad Wie pem deiphia P iladeiphia Pa geste E m New ok 1342 we Ved d af mee ic us achine and Foundey tinceton ind Pei b inch OSS T1830 Radio Condenser Co Camden Canioc Fastener Corp Parugus NE 71638 Radio Receptor Eo lac Brook ya Alten 3 Cardwell Electronic eee PUSUCH Ca Ne Harrisburg Pa Prod Corp Ploinerite Cann 78189 Shakeproct Division of Hlinois Bussmann Fuse Div of McGraw Tao Works Elgin Itt Edson Co St Logis Mo 7883 Signal Indicator Corp New York N Y Chicaga Condenser Corp Chicago HH 78280 Struthers Dein ane Pitman 8 CTS Coto Elkhart Ind 78452 Thompson Urener Cc Chicago II Cannon Electric Ca Las Angeles Calif mn Tilley Kig ve San Fraacisco Calif Cinema Engineering Co Burbank Caiif ne Hacxsoie Carbon Co 5t Marys Pa C P Clare Co Chicago Hi sn Sandars Tronson Coro Waltham Hass Denttalab Div of Globe Union ine J8553 Finneran Products inc Cleveland Ohio Milwaukee Wis 18790 Transformer Engineers Pasadena Calil Tha Cornish Wire Co New York amp Y T6967 Co Xewtonvitie Mass Chicago Siiature Lamp Works Chicago lll mae Veeder Root Inc Hartford Cana A Q Smith Corp Crowley Biv 1335 Weaco Co x Chicago Ill West Grange N J 7872 Continental Wirt iectronics dinis d n Ohi jladeiphia Pa fe ee oan wali dick 79963 Mig
46. ort Coan Bicontield Ni Chicago iH Chicago it Sunnyvale Casif Olean N Y Mt Carmel Hl Los Angeles Catif Chicago lll Buriisgton Mass Oakland Calif lnvungton H CBS lectiasics Div of C B 5 Ine Reon Resistor Corp Axel Brothers inc Rubber Teck iac Fraacis L Mosley Microdot lic Seaiecito Corp Casas Corp General Mitis Meh Hilis extric Co Clevite Trans stor Prod Orv of Cievite Carp Intesiationa Eiectronic Research Corp Columbia Techeicai Corp Varian Associates Marshall Industries leciros Producis Division Pasadena Calif Control Switch Division Ceatreis Co of America t Seguedo Calif Delevan Electronics Corp East Aurora S Y Wilco Corgoration indianapolis iad Reabrand Inc Boston Mass Holmes Somiconductos Div of Roffman Electrosics Corp Fechaoiogy Instrument Coro of Calif Dazvers Mass Yorkers K Y Jamaica N Y Gardena Caiit Pasadena Calif c Pasadesa Call Mamarnseck N Y Re woed City 098 Minneapolis Mist Miseots N Y Waliham Mass Burbank Calif New York amp Y Palo Atto Calif Evanston 141 Newbery Park Cali Code Ho Manufacturer Address THE FOLLOWING P VENDORS HAVE NO NUM BER ASSIGNED IN THE LATEST SUPPLEMENT TO THE FEDERAL SUPPLY CODE FOR MANUFAC TURERS HANDBOOK EGG JEO Efectromes Corp Var NeyS Calf GGGGG Traaex Company View Calif 14996 Westers Devices lac inglewo
47. own N Y Sylvania Electric Prod inc Semiconductor Div Robbins and Myers lac Stevens Mig Co Inc HowatG J Smith inc G V Coatiois Insuline Van Norman ind inc Electronic Division Manchester N H Raytheon Mfg Co industrial Components Div Receiving Tube Operation Quisey Mass Raytheon Mig Co Semicosductor Div California Street Plant Newton Mass Scientific Radia Products Inc Woburn Mass New York N Y Manstield hi Pest Monmouth 8 j N J Lavetan Colo Tung Sol Eiectric fac Newark N J Curtiss Wright Corp Electrosics Div Fast Paterson N J Seuthce Div of Chester Sars Lesle Pa Tra Ohm Prod Oiv of Model Engineering ang Mig Co Worcester Pressed Aluneum Corp Warcesier Mass Boston Mass Miami Fla Chicago ill Philbrick Researchers los Ailies Products Corp March 9 1964 Model 1111A MANUFACTURERS CONT D Manufacturer Address Continental Connector Corn Woogside N Y Leecraft Mfg Co Inc Hew York N Y Lerco fecttonics Inc Nationa 94 Co Vijtamon inc Gardas Corp Methode Mig Co Weckesser Co Huggins Laboratories Hi Q Division of Aelovox Thatdaisos Meisszet Div Magusa fndustries Inc Solar Manufacturing Co Catiton Screw Co Microwave Associates inc Excel Transformer Co Hr usttial alarning ing Co Agtomatic and Precision Mig Co Yonkers N Y Setbank Catif Sherztan vo Bridgeg
48. r Stations HEWLETT PACKARD COMPANY HARRISON LABORATORIES 1501 Page Mill Road Palo Alto California 94304 41 Industrial Road Berkeley Heights N J 07922 Tel 415 326 7000 TWX 415 492 9200 Cable HEWPACK Tel 201 464 1234 TWX Summit N J DYMEC DIVISION SANBORN COMPANY 395 Page Mill Road Palo Alto California 94306 175 Wyman St Waltham Mass 02154 Tel 415 326 1755 TWX 415 492 9363 Tel 617 894 6300 TWX 617 894 0789 BOONTON RADIO COMPANY F L MOSELEY CO Green Pond Road Rockaway New Jersey 07866 409 N Fair Oaks Ave Pasadena Calif 91102 Tel 213 Tel 201 627 6400 Cable BOONRACO 681 0208 TWX PASA CAL 7687 Cable MOCOPAS MARCH 64 AUTHORIZED SALES AND SERVICE OFFICES IN WESTERN EUROPE HEWLETT PACKARD S A Sweden 54 Route des Acacias gt HeP instrument AB Geneva Switzerland Centralvagen 28 Telephone 022 42 81 50 Solna Centrum Telex 2 24 84 Tel 68 83 08 30 Cabje HEWPACKSA Norway Morgenstierne amp Co Wessals Gate Osio Tet 42 99 93 Netherlands Hewlett Packard Benelux 23 Burg RoelIstraat Amsterdam W Tei 13 28 98 and 3 54 99 H Merituilinkatu Helsinki United Kingdom Tel 66 39 09 and 35 125 Hewlett Packard Ltd Dailas Road Bedford England Tel Bedford 68052 Denmark Tage Olsen A S Centrumg rden Roam 133 D Vesterbrogade Copenhagen Y Tel Minerva 6838 Germany Beigium Hewlett P
49. r from the 600 Q load and connect it to the Model 1111A output m Set the Model 1111A sensitivity to 1 MA CM X100 f n The Voltmeter reading should be 0 01 volts 4 5 7 NOISE a Connect the Probe item 3 in Table 5 1 to the Model 1111A input Model 1111A b Connect the Model 1111A output to the Oscil loscope plug in item 7 in Table 5 1 e Set oscilloscope and plug in SENSITIVITY to 05 VOLTS CM SWEEP TIME to 50 LSEC CM SWEEP MODE to PRESET and TRIGGER SOURCE to LINE d Set Model 1111A sensitivity to 1 MA CM e Position the Probe and Amplifier no input to probe so the external field coupling is minimum as viewed on CRT f With oscilioscope trace intensity setfor normal look closely at the high frequency random noise dis played Any noise should be less than 1 mm peak to peak which corresponds to less than 100 p p 9 8 BANDWIDTH a Refer to Table 5 1 and Figure 5 2 and connect test equipment Items requires are 2 3 4 and 9 b Set Model 1111A sensitivity to 1 MA CM c Set Voltmeter range to 0 1 volts d Set Oscillator frequency to 10 Kc and amplitude for a zero db reading on the Voltmeter e Set Oscillator frequency to 50 cps f Voitmeter reading should be 3 db or greater Hawks Figure 5 2 Oscillator Voltmeter Test Setup Tabie 5 2 Sensitivity and Accuracy Check Model 1111A Sensitivity MA CM 9 2 Voltmeter Range Volts Voltmeter Read
50. ranges current from the 47 5 volt supply through Q3 collector would flow to ground through R29 201 ohms or R28 50 ohms subtracting from the available collector currentofQ5 To obviate this R8 1200 ohms is switched in which passes this current directly to the 6 5 volt supply rebalancing the load on the positive and negative supplies Output transistor thus still gets allthe bias current established by R33 01862 2 Model 11114A Section V Paragraphs 5 1 to 5 5 SECTION V MAINTENANCE 5 1 TEST EQUIPMENT REQUIRED connector or a BNC banana plug SABE For the capacitive load use a 22 pf capacitor Stock No s2 INSTRUMENTS Table DNO connector sock No 1280 making the Model 1111A adjustments Substitute 0079 Solder the capacitor between center conductor equipment should provide performance according to on rear of connector and the shield next to threaded the specifications listed in Table 5 1 Be sure test section equipment has been recently calibrated and always allow manufacturer s suggested warmup period to 5 4 PERFORMANCE CHECK obtain full accuracy 5 5 The procedure of Paragraphs 5 6 through 5 9 should determine if the Model 1111A is operating with 5 3 SPECIAL LOADS Three special loads are in its specifications If performance is out of speci required 502 600 2 and 22 pf These may be fications refer to Paragraphs 5 10 through 5 13 made by using the appropriate connector adapter an
51. rex Gorg Garleck Packing Ca Eieclronic Proocls Div Astovar Cait Camden 8 3 Rew Sediord Mass Amp iat Marrisdatg Pa Aurcralt Radie Corp 1 Northern Engineering Lasoratones Ing Bu liagto6 Wis Sangamo Electre Company Ordill Division i Capacitors Marion III Sce Eaginaeiing Zo Las Angeles Calif fal E amp olmas Corp Los Angeles Catil Allen Sradtey Co Milwauxss Wis Litton lodusiries ine Bev riy Hits Calif Pacific Semicosductors Ine Ceiver City 0818 Texas isstremeats inc Transistor Preducts Div The Affiaece Mfg Co Chasse Trak Corp Paciile Relays inc Amerex Cors Pulse Engineering Co Fettoxcube Cora of America Cole Mfg Ca Pale Aito galir Amphenol Borg Electronics Cara Chicago ili Radio Corp of America Sem condactor and Materiais Div Semerville Rj Voesliae Ca af America mc Ol Say amp rook Conn Hopkins Cagingering Co San Fernando Caiit G E Semiconenctor Products pepi Syracuse N Y Apex Machine Toe Co Daytot Ohio Eidama Corp Et Monte Calif Transittan Eleciranic Gorg Wakefield Mass Pyrofiim Resislot Co Mortistowa N 1 Ait Marine Motors ios Angeles Calif Asow Kast and Hegemer Elect Co Martior Conn New York N Y Myrtle Beach 5 0 Dallas Texas Alliance Ohio Indiasapolis ind Van Nuys Calif Rocktord Lih Satta Giara Calif Saugerties N Y Eimenco Products Co Hing Division of Aerovox Ei
52. sing the Model 1111A amplifier inother applications Table 3 1 lists gains for all sensitivity ranges 3 15 INPUT IMPEDANCE The X100 range is a constant 0 5 ohms 3 in series with an inductance of about 30 x 10 9 H about 2 of wire In the X1 position input impedance is more compiex but up to about 100 kc can be approximated by a 2000 microfarad capacitor in series with a resistance of between 0 2 and 0 5 ohms depending on sensitivity setting At higher frequencies the input impedance becomes dependent on feedback factor changes with frequency Table 3 1 Amplifier Gain MV MA n i MV out MA 1111A only with probe Switching to X100 attenuates all ranges 100 times 01862 2 Model 1111A Section IV Paragraphs 4 1 to 4 8 SECTION iV PRINCIPLES OF OPERATION 4 1 INTRODUCTION 4 2 The Model 1111A is a current amplifier which is Specifically designed for use with the Model 1110A Current Probe As described in the following para graphs the Model 1111A consists of an input amplifier an output amplifier and a power supply Refer to the instrument schematic Figure 5 9 for circuit references f 4 3 INPUT AMPLIFIER 4 4 To obtain the maximum low frequency potential of the probe as well as optimum linearity and large Signal performance the probe should have a load impedance which is much lower than the winding re Sistance of the current transformer in the probe The input amplifier provides s
53. sme Calif QOUXX Methode Ziecltomes Inc Ciicage 31 Hi MYY K Smith Co Los Aageies 45 Cait From F S C Handbook Suoplements H4 1 Dated March 1963 H4 2 Dated March 1962 01682 2 HEWLETT PACKARD SALES AND SERVICE OFFICES IN NORTH AMERICA Cleveland Ohio 44129 Rochester N Y 14625 Syracuse N Y 13211 4 Poughkeepsie N Y 12601 BOSTON AREA y Crossley Associates Inc ttewlatt Packard Company Hewlett Packard Company Mawlett Packard Compan Yewell Associates Inc 5579 Pearl Road 800 Linden Avenue Pickard Building 82 Washington St Middlesex Turnpike 206 884 9209 07185 381 4120 Molloy Rd and Pickard Dr 1914 454 7330 Burlington Mass 01804 315 454 2484 617 272 9000 Detroit Mich 48235 Middletown Conn 06458 Crossiey Associates inc lt s vere seti ir inc 14425 West Eight Mile Road aybroo 313 342 5700 Lio New York N Y 10021 Swim RMC Sales Division PITTSBURGH AREA Hewlett Packard Company Crossley Associates fne 2545 Moss Side Bivd Monroeville Pa 5146 412 271 5227 RMC Sales Division Hewlett Packard Company 226 Fast th Streat yy 2 Englewood N 4 07631 212 a79 L P Y 391 Grand Avenue 201 567 3933 ASBURY PARK AREA Robinson Sales Division lo ewlatt Packard Compan PHILADELPHIA AREA Shrowabury New Jersey Robinson Sales Division Dayton Ohio 45409 Crossiey Associates inc 1250 W Dorothy Lane 513 299 3594 1 Pe pas
54. t in iogar pe instrument operating within specifications tubes and transistors MEG Tee i T selected for best M nmi 10 5 performance will be mimature supplied if ordered VETELM F by stock numbers MFR manufacturer i i MOM momentary ELECT electrolytic MTG mounting ENCAP encapsulated MY mylar 01862 1 Section VI Paragraphs 6 1 to 6 7 6 4 ORDERING INFORMATION 6 5 To order a replacement part address orderor inquiry either to your nearest Hewlett Packard field office or to or in Western Europe to 6 6 CUSTOMER SERVICE Hewlett Packard Company 395 Page Mill Road Palo Aito California Hewlett Packard S A 54 Route des Acacias Geneva Switzerland Specify the following information for eachpart a Model and complete serial number of instrument b Hewlett Packard stock number c Circuit reference designator d Description 6 7 To order a part not listed in Tables 6 1 and 6 2 give a complete description of the part and include its function and location REFERENCE DESIGNATORS H oH Ho n 4 U 3 D ABBREVIATIONS NC NE NO NPO Bo H H NSR OBD Ox Hog d oa J j d a won plug transistor resistor thermistor switch transformer normally closed neon normally open negative positive zero zero temperature coefficient not separateiy replaceable erder by description oxide peak printed cir
55. t probe around wire carrying sinusoidal current of 60 ma 50 kc No input signal for Test Points 5 and 6 Wf aia vA pn HA mA IS 01862 2 01 9 6 G oj 2neureuogs saduy 1191139 Oy 6 S AigW3SSV 907 N39Od IV zzv dWY uni ov vii OD OBYODIOVd LL3 lIM3H AB 96 iH9 UAdOO i90 i HOLY TOSH 931835 W2 AN OS o1 Afidino 3l OQ es o 92 o oS FI er 82u lo TOES S C hay bu ERE ee NACE s i 104100 1 CORES 3001103 I M31ilW3 olz SiiW17 N33A 138 Q3iBvA 5 vid NIHA SITOA 58698 OL 66b SOVIIOA Gy 9 SNOLUGQNOD LN3A3HOSY3N WHOJ3AVA ONY 39VITOA 2Q 9804 39 d ONIOVA 335 HV3d NOHd3 4 ANYS 4 WOHY 3 5834 MDD ATINI NAOHS ES HOLIMS b 2v A18W083SSV LI09819 G3H013 S31V2IONI V3uY Q30VHS 40 iNVd O d HiVd TVN9IS SSLVDIGN eee Z SOVHVJONDIN ANY SWHO NI S301VA 11V O31VOIQNI 3SIMH3H1O SS33Nf S310N f 6 9 911514 A Uong 67 9810 10343 130 1M P 5 8b Sb Ip 8 SC 2 62 22 2 02 Li Il 8 p Z iu 9 15 z If Ol 4 tpe 182 62 G2 12 91 wie dt 8 5 12 2 v SNOIIVN9IS3Q0 32N383339 VILIT TIOPON Modei i111A SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering replacement parts Table 6 1 lists parts in alpha
56. the MC CM of the range in use If sag appears here replace C4 Check power Supply capacitors d If sag does not exist at Test Point 1 trace the signal through the resistive divider on switch through C18 Q4 and Q5 Check C20 in Q5 collector circuit and center pin of J2 9 19 EXCESSIVE SQUARE WAVE OVERSHOOT 9 20 This is very unlikely except in cases of tran sistor replacement In any case be sure the trouble is not in the test set up See adjustment procedure for calibration method If excessive overshoot actually is present carry out the pulse response adjustment procedure fully for all ranges 2 21 OUT OF CALIBRATION 9 22 Use the calibration procedure to be sure the trouble is really due to the Model 1111 Smali variations can be adjusted with R40 but any large discrepancy may be due to a faulty probe or some amplifier or power supply problem A check of de voltages should locate the faulty components 5 23 REPAIR AND REPLACEMENT 9 24 COMPONENT LOCATION 9 25 Figure 5 6 5 7 and 5 8 identify all the components of the Model 1111A which have reference designators These components and those miscel laneous parts having no designators are listed in Section VI with replacement stock information 1 A B Figure 5 6 Power Supply Assembly 01862 2 Section V Paragraphs 5 19 to 5 27 IELLA A I Figure 5 7 Front Panel and Sensitivity Switch Components 5 26 REPLACING ETCHED CIRCUI
57. uch a load and also accomplishes the current to voltage conversion necessary for oscilloscope display Circuitoperation is described in Paragraph 4 5 and the biasing arrangement is described in Paragraph 4 10 4 5 CIRCUIT OPERATION 4 6 The input amplifier consists ofa grounded base amplifier Ql and cascode amplifier Q2 Q3 The cascode amplifier combination using two transistors gives a lower effective coliector base capacitance than that of one transistor The simplified schematic in Figure 4 1 shows the conditions for the 1 MA CM range and omits a bias setting adjustment R14 at the base of Q3 GROUNDED BASE AMPLIFIER PROBE gt C4 4 7 An ac signal current from the probe is split between Qi emitter impedance of about 15 ohms to ground and R20 about 2000 ohms However due to the unity current gain of grounded base amplifier Q1 any portion of the input signal current flowing into Q1 emitter is applied directly to Q2 base causing about 100 times as much current to fiow through R20 Therefore because of this feedback about 9975 of the input signal current flows through R26 and only 1 into Q1 emitter This action has two results 1 since only 1 of the signal current flows into the lo ohm emitter impedance of Q1 the input voltage developed is only 1 of what this current would de velop in a 15 ohm resistor meaning that the input impedance is reduced by a factor of 100 down to 15 ohm 2 since 99 of

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