R1M-A Manual (for units purchased prior to October 2013)
Contents
1. Cage Cage Manufacturer Code Manufacturer Code ABBATRON HH SMITH 91967 KEMET ELECTRONICS 31433 ALPHA 92194 KOA 59124 AMERIPACK OTJ49 LITTLEFUSE 7E222 AVX 16299 MAXIM 1ES66 BELDEN 3HXC8 MCMASTER CARR OKVE6 BOURNS F0978 MICRO COMMERCIAL 374W0 C amp K 63HW9 MILL MAX 3N087 CLEVELAND CIRCUITS SEE TEGAM MOTOROLA 0G546 COMMERCIAL SEE MCMASTER CARR MULTICOMP 75498 CONCORD 18310 MULTI CONTACT 0 0 COOPER BUSSMAN 1UW16 NATIONAL SEMICONDUCTOR 0G557 CORCOM 38AS8 OLDAKER 64882 CUSTOM COIL OVYLO PANASONIC OHF77 DIALIGHT DIALCO 96312 PHILIPS OTBA7 DISCH SEE TEGAM POMONA 5D6S9 EAGLE 5 PPM SEE ELECTROSWITCH 8 045 SPRAGUE 5079 ELECTRO TECH SYSTEMS 56541 ST MICROELECTRONICS SCE76 ETCHED METAL SEE TEGAM TEGAM 49374 FAIRCHILD SEMICONDUCTOR 4E8P4 TYCO Z9V34 FEMA OP7Z6 TYTON 3E655 GE MG CHEMICALS L3160 VISHAY SILICONIX 463 GRAYHILL 81073 VOLEX POWER CORDS U7112 ILLINOIS CAPACITOR 74840 Table 7 Vendor Cage Code Directory 10 TEGAM WAY gt GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 19 SERVICE INFORMATION SECTION 6 SERVICE INFORMATION Preparation for Calibration or Repair Service Once you have verified that the cause for R1M A malfunction cannot be solved in the field and the need for repair and calibration service arises contact TEGAM customer service to obtain an RMA Returned Material Authorization number You can contact TE2. MODEL Operation and Maintenance Manual PN R1M A 900 01 Publication Date December 2012 REV C REPRODUCTION AND DISTRIBUTION OF THIS TECHNICAL MANUAL IS AUTHORIZED FOR US GOVERNMENT PURPOSES TEGAM PROPRIETARY INFORMATION NOTE This User s Manual was as current as possible when this product was manufactured However products are constantly being updated and improved To ensure you have the latest documentation refer to www tegam com 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com TEGAM TABLE OF CONTENTS TABLE OF CONTENTS 1 INSTRUMENT DESCRIPTION 1 1 Performance Characteristics 1 1 Description of Equipment nnn 1 2 List of Items Furnished insets aaa ae 1 3 Storage and Shipping 1 3 2 PREPARATION FOR USE AND INSTALLATION Unpacking and Inspection 2 1 Preparation for Use nies 2 1 Figure 1 Connection 2 3 3 OPERATING INSTRUCTIONS PUSHBUTTON FUNCIONS 3 1 General Theory of Operation 3 2 4 PRINCIPLES OF OPERATION 5 MAINTENANCE 5 1 cepe MT 5 1 Test Equipment required for Calibration and Repair 5 1 Performance Verification
3. 111111 5 2 CalibratiOn nennt ean 5 3 5 4 Tiro bleshooting iat erra t hne tru nh nennen Table 2 Fault Symptoms and Repair Actions 5 5 Preparation for 1 1 5 6 Overhaul Instructions esses haaa nennen nares 5 6 Figure 2 Front Panel 15 1122 5 7 Figure 3 Front Panel Rear View 5 8 Figure 4 Simplified Block Diagram 5 9 Figure 5 Power Supply 5 10 Figure 6 Power Supply 4 5 11 Figure 7a 7b Display Board Schematic 5 12 Figure 8 Display Board Parts 1 asserccrerree 5 14 Figure 9 System Side View Layout 5 15 Table 3 4 5 6 Parts List 5 16 Table 7 Vendor Cage Code Directory 5 19 SERVICE INFORMATION 6 Preparation for Repair or Calibration Service 6 1 Expedite Repair and Calibration 6 2 Warranty sese ies ea ease 6 3 10 WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com TEGAM INSTRUMENT DESCRIPTION SECTION 1 INSTRUMENT DESCRIPTION INTRODU
4. 3 54 DPDT Toggle ON 32 1 33 0 ALT C amp K 7201 SYZQE 34 24 AWG Orange wird 35 4 24 AWG Yellow Wire 36 4 24 AWG Blue Wire 8 37 24 AWG Violet Wire 8 38 18 AWG Black Wire 39 10 7 41 7 42 1 4 Cable Ties Tyton T18R 40 Table 5 Parts List Front Panel Assembly 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 18 TEGAM Inc Geneva OH Bill Of Material foPower Supply Board Assembly ITEM REFERENCE DESCRIPTION C Board 4 2 x 4 7 Gleveland Circuits 12157 C BOM Part Number M603 Formerly M100370 Date 9 1 09 Model NumberR1M AR MFGR By CMG MFGR PART NO 1 C23 24 C25 26 3 2 2 L 6 L 4 L D9 10 11 12 10K Custom Coil 12314 16 1 ND 17 1 23 24 Hi Voltage Diode Motorola 1000V Rectfier Diode 1N4003 CF 1 4 20M 5 150K 3W 5 106 1 4007 Table 6 Parts List Power Supply 173D685X9015V P 0 22 MFD 630 224MSR630K 100 50 WVDC IC 107 050 6 8 MFD 15V Sprague Tantalum 7 7 0 0047 1250V Panasonic ECW H12472 V OM 5093NW150K0J 5093NW150K0J N55D1002F ND 2 AWG Bus Wire Belden 1 8021 RTV RTV 102
5. 100 V test voltage a 100 GQ resistor are passed with essentially loss NOTE D5 and D6 on the display board parts layout Figure 8 correspond to Q5 and Q6 on the display board schematic Figure 7a This is due to the fact that transistors are being used as diodes NOTE The action of D3 is to create a virtual ground at the input pin 2 and at the SIG binding post This has the advantage that the full value of the test voltage is developed across the resistor under test with no error caused by the current monitoring resistor R16 through R21 A second advantage is that the power common may then be used as a guard voltage because it is essentially at the same potential as the SIG binding post The signal current through the resistor under test increases with increasing test voltage Thus the IR drop at the output of U3 varies with the test voltage The signal current with 50 V test voltage and a 1 MQ test resistor is 50 With 52 set to the 1 range this current flows through R21 499 Q Thus the voltage at the output of U3 is 25 mV For higher resistance ranges S2A selects higher values of resistance R20 4 99 R19 49 9 etc to compensate for decreasing values of signal current Thus the output of U3 remains at 25 mV for full scale test resistors for all ranges with 50 V test voltage However if the test voltage is increased the signal current and the voltage output of U3 will increase To
6. brands may contain fibers which could scratch the display window DO NOT apply significant pressure to the LCD window as it could separate from the front panel DO NOT use alcohol solvents or harsh chemicals to clean the LCD window 5 3 Test Equipment Required for Calibration and Repair Calibration of the R1M A is recommended on a yearly basis and is done at a temperature of 23 C 1 C Precision decade resistor boxes settable to 50 1 10 MO 100 MO 1 GO 10 GO and 100 GQ with accuracy of 0 1 or better A standard digital voltmeter 3 digits minimum with 19 99 and 999 V ranges accuracy of 0 02 of reading or better HP Agilent 34401A or equivalent 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 1 Oscilloscope 20 MHz minimum bandwidth 5 sensitivity Tektronix Model 2205 or equivalent Screwdrivers Phillips No 2 and small flat bladed 5 4 Performance Verification WARNING DO NOT TOUCH ANY ALLIGATOR CLIP WHILE THE TEST PUSHBOTTUN IS PRESSED LETHAL VOLTAGES MAY BE PRESENT ON THESE CLIPS 1 Check the test voltages Connect a DVM with at least 1 resistance between the TEST high jack and the SIG low binding post Note that the OHMS RANGE switch must be on the 1 range or the short circuit protection circuit may start to shut down the high voltage power supply Check that the voltages are as selected
7. correct reading If the selected range is too low for the value of the resistor under test the display will show over range by showing 1 on the display Similarly the under range condition is displayed by showing negative readings on the display 1 is displayed on the display until the test button is pressed The POWER switch turns on the power to operate the unit or turns off the power to the unit Note that when power is turned off it may take several seconds to discharge circuit capacity to completely blank the display The black markings seen have no effect and disappear when power is turned back on WARNING TAKING RESISTANCE MEASUREMENTS ON A POWERED OR ENERGIZED COMPONENT COULD CAUSE SERIOUS HARM TO THE OPERATOR AND OR DAMAGE THE 1 BE SURE THE ITEM TO BE MEASURED IS DISCONNECTED FROM OTHER COMPONENTS AND APPARATUS 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 3 1 TEGAM OPERATING INSTRUCTIONS 3 2 General Theory Of Operation A 2 terminal measurement method is used to determine the resistance of the item under test The R1M A calculates the resistance of the item under test utilizing Ohm s law and displays it on a 3 15 digit display To obtain the best accuracy allow the R1M A to warm up for 15 to 30 minutes before making measurements In any case a minimum warm up of 30 seconds is advised Depress the TEST pushbutton which switches on the high vo
8. for 196 accuracy Turn the power off 5 6 Troubleshooting Disassembly After removing the unit from the cabinet it may be disassembled as follows Remove the two knobs on the rotary switches e Remove the four small screws holding the power supply board to the threaded spacers e Remove the four front panel screws that pass through the front panel metal tubular spacers nylon washers the display board into the threaded spacers e The two boards may now be separated for service Re assembly After trouble shooting and repair re assemble in reverse order from above Following are possible symptoms diagnosis and repair suggestions for use in trouble shooting the most likely causes are listed first Note that the TEST button must be held in for most of these tests do not try to bypass it because it is a safety feature shorting the high voltage supply Note that even with the TEST button released high voltage still exists between the transformer secondary and R37 10 TEGAM WAY gt GENEVA OHIO 44041 e 440 466 6100 FAX 440 466 6110 salesetegam com 5 4 TEST pushbutton U5 U6 T1 D9 amp 12 or U7 T1 D10 amp 11 or FAULTY SYMPTOM COMPONENT REPAIR No Display Line Power Check power cord amp power Check fuse Line Fuse Depress the TEST pushbutton and see if the LED comes on If so check for a square wave at pin 40 of U4 and or replace U5 U6 If not check for proper p
9. CTION 1 1 Purpose The Model RIM A Megohmmeter is a portable instrument used to measure high values of resistance It is enclosed in a rugged weather resistant housing designed for severe industrial and military applications The Model RIM A may be used to measure resistances between 50 and 10 GQ with 50 V test voltage and between 1 MQ and 200 GQ with 100 V 250 V or 500 V test voltage 1 2 Performance Characteristics This is a digital reading instrument with six resistance ranges and four test voltage ranges Full Scale Resolution Test Voltage Range 2 V 1 1M 1k 2 10M 10 k 3 100 M 100 k 50 100 4 1G 1M 250 5 10G 10 0 6 100 G 100 M Table 1 Specifications Accuracy Resistance accuracy on all ranges 5 Test Voltage accuracy on all ranges 3 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 1 1 TEGAM INSTRUMENT DESCRIPTION 1 3 Description of Equipment Physical A rugged heavy duty case is provided to contain and protect the instrument When closed a gasket seals the lid to protect the instrument against water and dirt while the instrument is carried through rainstorms or other hazardous conditions The lid is secured by two latches A handle is provided for portability A compartment is provided for storage of test cables and line cord Dimensions 216 mm 8 5 x 228 mm 9 x 152 mm 6 W
10. EN THEY ARE CONNECTED TO EXTERNAL CIRCUITS LETHAL VOLTAGES MAY BE PRESENT AT THESE POSTS 1 4 List of Items Furnished 1 each Model R1M A with power cord 2 each test cables one shielded with two alligator clips and the other with one alligator clip 1 each R1M A Instruction Manual 1 5 Storage and Shipping Requirements Standard precautions which apply to electronic test instruments should be followed A hard mechanical shock such as from dropping the R1M A could damage the liquid crystal display Care should be taken to prevent damage to associated cables R1M A should be stored in a relatively dust free environment Temperature 40 C to 71 C Relative humidity 0 to 100 non condensing Altitude 4570 m See Section 5 7 below for shipping requirements 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 1 3 TEGAM PREPARATION FOR USE AND INSTALLATION SECTION 2 PREPARATION FOR USE AND INSTALLATION 2 1 Unpacking and Inspection Upon receipt the R1M A and accessories should be carefully unpacked and removed from the shipping container Separate the units from the packing material and inspect both the instrument and the accessories for any external damage e If any dents broken or loose parts are seen do not use the equipment Notify the shipping company immediately and follow their instructions as to how to proceed e Check that all items are prese
11. FAX 440 466 6110 sales tegam com 5 17 TEGAM MAINTENANCE TEGAM Inc Geneva OH BOM Part NumberM604 Formerly M100580 Bill Of Material for Front Panel Assembly Model Number By CMG Date 9 1 09 Job No R1M AR ITEM REFERENCE QTY DESCRIPTION MFGR MFGR PART NO 1 LED Dialco 558 0101 003 31 Banana Jack MultiContact 23 3000 22 Recessed Red 2 1 584 3 22 1 Binding Post Black Pomona 3750 0 4 J3 4 Binding Post Red Pomona 3750 2 2s i j 1 Base Black 24 1 5 6 Binding Post Metal Smith 137 7 1 Spacer 8 0 15 3 8 Dia Alum Rod 9 shorting tink jsur H H Smith 1828 10 4 x 0 01 Nylon Commercial 11 4 12 15 1 Appliance Connector Corcom 6ESRM 3 13 fe 2 2 Je Ege jakNots 14 1 12400 is xii re Commercal 16 2 rue CearRTV Commercial 17 1 8 45 4 40 x V PPH MS S Commercial 18 1 19 2 4 40 Lockwasher Commercial 20 3 4 40 Hex Nut Commercial 21 2 22 4 4 40 x 1 PPH MS SS Commercial 23 1 Display Gasket Disch 12373 24 25 Heatshrink 0 75 Ea 6 pieces 3 16 Alpha RNF 100 3 16 BK STK 26 Heatshrink 0 75 Ea 27 1 S N Label Bus Book 9997 1 Fuseholder Littlefuse 03453LF1 28 0 Fuse 1 8 Littlefuse 312 125 29 1 a 3 4 ALTjBussman AGC 1 8 46 102 2015 2004 31 S3 1 Push Button
12. GAM customer service via the TEGAM website www tegam com by calling 440 466 6100 Locations OR 800 666 1010 United States Only The RMA number is unique to your instrument and will help us identify you instrument and to address the particular service request by you which is assigned to that RMA number Of even importance a detailed written description of the problem should be attached to the instrument Many times repair turnaround is unnecessarily delayed due to a lack of repair instructions or of a detailed description of the problem This description should include information such as measurement range and other instrument settings type of components being tested are the symptoms intermittent conditions that may cause the symptoms has anything changed since the last time the instrument was used etc Any detailed information provided to our technicians will assist them in identifying and correcting the problem in the quickest possible manner Use a copy of the Repair and Calibration Service form provided on the next page Once this information is prepared and sent with the instrument to our service department we will do our part in making sure that you receive the best possible customer service and turnaround time possible 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 6 1 TEGAM SERVICE INFORMATION Expedite Repair amp Calibration Form Use this form to provid
13. Master 2104 440 B 12 Hex Standoff 10 Aluminum 2 L j as Pon supply Bard TEGAV EE 8 32 x 3 8 x 3 8 Hex McMaster Aluminium Standoff 8 32 x 2 x 3 8 Hex Aluminium Standoff 8 32 x 3 8 Philips McMaster Truss Head Screw SS Black ABS Panel 6 62 TEGAM X 6 68 Horcell Finsh 1 16th Oz IPS Weld McMaster On 3 Solvent Cement 21 1 2 1 rem i 2 j Sticker presa j sf estibration Stier j Model 850 Surface Electro Tech Systems gt Packaging Table 3 Parts List Board Assembly 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 16 Inc Geneva BOM Part Number 602 Formerly M100332 Bill Of Material for Display Board Model Number By CMG Date 9 1 09 R1M AR ITEM REFERENCE DESCRIPTION MFGR MFGR PART NO 1 PC Board 4 2 x 4 7 Cleveland Circuits 12156 B rep pee 2 18 4 cs 1 o4wrb Kemet 03300474115 5 1 Tantalum 1 x 0 01 MFD 50 WVDC SR151E103MAA 2200 pF 100V X7R AVX SR151C222KAR Cer 100 pF 100V NPO Multicomp 2222 680 34101 Ceramic Not Used Diode Signal Q1 Hi Voltage NPN ST Micro 10 2 26 Dale RN55D2001F e 1 ous RNXO3810MOFNLB 12 R4 19 22 49 9K Dale RN55D4992F 3 ero Dale RNssi001F 3 01K Dale RN55D3011F 100K Dale RN55D1003F Trimpot 10K Bourns 49 9M Phillips R
14. NX1 4 50M 1 K 4 99M Dale CMF554M9900FKEK 499K 499 OHMS Dale RN55D4990F 11 8K Dale RN55D1182F 10 OHMS Trimpot 20K Bourns 3006P 1 203 Rotary 2 Pole 4 Pos Electrosw SDS 15 16 2 2 ajo N m a a 18 19 20 21 22 23 24 25 26 27 1 28 SI E E KEE mm N N I e a L t t L 21 2 2 2 NIN wj 2 N m m 5 0206 4006 Q N Rotary 2 Pole 6 Pos Electrosw C5P0206N 4006 Quad OPAMP National 2 5V Reference Motorola MC1403P1G Low Bias Current National LMC6041AIN 3 5 Digit D A LCD Out Maxim LCD Display FEMA Quad Exc or Gate National CD4030BE 14 Pin IC Socket 316 93 120 41 001 4 40 x 1 4 PPH MS ommercial 5 Ex For Mig 4 40 Hex Nut For Mtg Q1 4 Internal Tooth LW Commercial For 6V 24 AWG Red Wire 4 For 6V 24 AWG Brown Wire 4 YU U U P ojo 5 fe A Jo 5 38 39 40 8 Pin IC Socket 40 Pin IC Socket 20 Pin Row Socket 5 wo E SEE 4 45 24 AWG Gray Wire 4 46 4 ae Pe 47 4 a For Eout 24 AWG Violet Wire 4 48 4 Table 4 Parts List Display Board 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100
15. am 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 9 LH ISPOIA 1 HIS NOM 2 Figure 5 Power Supply Schematics 10 TEGAM WAY gt GENEVA OHIO 44041 e 440 466 6100 FAX 440 466 6110 sales tegam com 5 10 SCALE Not to Scale czq ur B 1 O EOUT Figure 6 Power Supply Board Layout 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 salesetegam com 5 11 MAINTENANCE TEGAM M CT biet ONI 31 INIT 330v 725339 406 305 1 3 m ell Figure 78 Display Board Schematic 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 12 MAINTENANCE TEGAM LE ISPOIAI paeog e dsic HOS aw ET Pe a u a amp 12 m oj r E m un hl m L e a 12 5 1531 48 hoy 104 5 3 3 ed 2 t8 EV 29 24 23 78 a lt x 12 5 SS hn Figure 7b Display Board Schematic 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales teg
16. am com 5 13 MAINTENANCE TEGAM BWIA ISPOIN L7 NN gv 168 6 9 8 17 A8 Q3AONddv apis aiisoddo a p uo puo 25 15 0N s Fa 5 B 5 WERE 5 E gta JEX sio aE 8 BREE Figure 8 Display Board Parts Layout 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 14 HWA LB IPON 160 d aw secs S55 171 y Ln0Av7 S yv4y sos zea Sueos 200005 a 3 Eok ZI Y 7 5 30 agzi yY 7 918 4 SBS u Sason Awodsic 489171 5 2 Sena sas mand row E es r Figure 9 System Side View Layout e salesetegam com 5 15 10 TEGAM WAY GENEVA OHIO 44041 e 440 466 6100 FAX 440 466 6110 BOM Part Number 601 Formerly M100371 Bill Of Material for System Model Number By CMG Date 9 1 09 Job No R1M AR 850 ITEM REFERENCE DESCRIPTION MFGR MFGR PART NO EMEN 01 Nylon 2 tres cate oe i ose CLE CLC 1 vox Ps des 7 EN M 4 40 x 1 4 PPH MS McMaster SS ES N ger Alm 4 40 x 1 2 Threaded Mc
17. by the TEST VOLTAGE selector switch within 3 If not there is no adjustment other than to check the various components in the high voltage regulator circuit and to replace any found to be defective 2 Check that the light emitting diode circuit is operating correctly It should light when the TEST pushbutton is depressed provided that the resistor under test is within the selected resistance range Power must be ON 3 Check the accuracy of the resistance indication by measuring resistors of known accuracy Resistors required are 50 kQ 1 MQ 10 MQ 100 MQ 1 GQ 10 GQ 100 Check each range with a resistor of the indicated value of that range and also with a resistor of 10 of that value with the exception of the 1 MQ range which should be checked with a 50 resistor Check first with 50 V and then with 500 V but DO NOT CHECK THE 50 AT 500 V All readings must be within 5 of the actual value If not adjust the trimpots as described below 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 2 5 5 Calibration WARNING DISCONNECT THE AC POWER CABLE BEFORE REMOVING THE INSTRUMENT FROM ITS CASE LETHAL VOLATEGS ARE PRESENT WITH AC POWER CONNECTED Remove the four large mounting screws from the front panel and remove the instrument from the case The binding posts and switch knobs may be held to assist in removal Note that the un
18. compensate for this the amplifier section of U1 having pins 1 2 and 3 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 4 2 TEGAM PRINCIPLES OF OPERATION changes gain with the test voltage With 50 V its gain is set by S1B and R22 at 4 23x so the output at pin 1 is 106 mV With 500 V the gain is decreased to 0 423x so the output remains at 106 mV even though the increased test voltage increases the signal current by ten times As indicated above the output at pin 1 of U1 is 106 mV for full scale resistor values of any range and with any test voltage For smaller resistors this voltage increases At 5 of full scale this voltage is approximately 2 12 V approaching its upper limit If the value of resistance under test is less than 5 of the selected range the voltage at pin 1 of U1 will exceed 2 12 V This voltage is connected to pin 5 of U1 where it is compared with the 2 5 V reference from U2 If the voltage exceeds 2 5 V the output at pin 7 of U1 goes positive increasing the base current to the shunt regulator Q1 and reducing the output high voltage When this happens the normal regulating section of Ui with output pin 8 which is normally somewhat positive to control Q1 turns off and pin 8 goes full negative trying to increase the value of the high voltage This negative voltage is coupled to the input pin of the A D IC U4 via diode D4 Thus the display will show a minus sign
19. e additional repair information and service instructions The Completion of this form and including it with your instrument will expedite the processing and repair process RMA Instrument Model Serial Number Company Technical Phone Contact Number Additional Contact Info Repair Instructions L Evaluation O Calibration Only L Repair Only Repair amp Calibration L 2540 Detailed Symptoms Include information such as measurement range instrument settings type of components being tested is the problem intermittent When is the problem most frequent has anything changed with the application since the last time the instrument was used etc 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 6 2 TEGAM SERVICE INFORMATION Warranty TEGAM Inc warrants this product to be free from defects in material and workmanship for a period of one year from the date of shipment During this warranty period if a product proves to be defective TEGAM Inc at its option will either repair the defective product without charge for parts and labor or exchange any product that proves to be defective TEGAM Inc warrants the calibration of this product for a period of one year from date of shipment During this period TEGAM Inc will recalibrate any product which does not conform to the published accuracy specificat
20. e compartment 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 3 2 PRINCIPLES OF OPERATION 5 SECTION 4 PRINCIPLES OPERATION The power supply uses a transformer with two secondary windings The low voltage winding is a center tapped winding Diodes D9 and D12 provide rectified power filtered by C26 and regulated at 6 V by D7 Diodes D10 and D11 provide rectified power filtered by C25 and regulated at 6 V by D8 The high voltage winding on T 1 charges C23 through D7 and C24 through D8 Since these two capacitors are connected in series this circuit functions as a voltage doubler to provide a high voltage nearly equal to twice the peak voltage of the high voltage winding This high voltage is at least 650 V at low line in order to provide 500 V test voltage with 1 IDA of I x R drop across R37 R37 a series resistor is followed by 01 a high voltage shunt regulator to regulate the high voltage supply at the selected value R38 provides protection for Q1 from excess current caused by external voltages R6 R9 operate as a four section voltage divider dividing the voltage from U2 a 2 5 V precision voltage reference to 0 25 0 5 1 25 and 2 5 V The voltage selected by S1 A the TEST VOLTAGE selection switch is fed into pin 9 of U1 a quad operational amplifier The high voltage output is divided by R3 and R4 to 1 200 of the high voltage output This divided voltage is
21. e has a double banana plug at one end and red and black insulated alligator clips at the other end This is the shielded test cable Connect the red alligator clip to one end of the resistor under test Connect the black clip to the guard circuit if any If no guard is available this clip may be left floating it is connected to the cable shield and to the R1M A guard circuit at the other end however this clip must not be allowed to make accidental contact with any part of the external circuit Plug the dual banana plug on this cable into the SIG and GUARD binding posts Note that the pin marked GROUND should go into the GUARD binding post If there is no guard available and the black alligator clip at the other end of the test cable is left floating the operator may choose to orient the dual banana plug so that the GROUND pin is NOT plugged into the GUARD binding post This will ensure that any accidental contact of the black alligator clip will cause no problem however the cable shield will then be floating and the signal may be excessively noisy The other test cable has a shrouded banana plug on one end and an insulated alligator clip on the other end This cable carries the high voltage output of the R1M A to the resistor under test Connect the alligator clip to the other end of the resistor under test then plug the shrouded banana plug into the recessed RED TEST jack Please refer to the connection diagram figure 1 below T
22. eight is 2 3 kg 5 Ib Controls and connectors are of a size and spacing such that the instrument may be operated while wearing safety gloves Electrical Input power is from the AC power line 103 5 V to 129 V at 50 Hz or 60 Hz at less than 1 8 A Environmental This unit will operate over a temperature range from 0 9 to 50 C 75 RH non condensing up to 3050 m altitude Withstand functional shock of 40 G for 11 ms Vibration 2 G maximum at 5 Hz to 55 Hz Front Panel Controls and Displays See figure 2 OHMS RANGE Switch is a rotary six position selector switch used to step through all six ranges TEST VOLTAGE RANGE Switch is a rotary four position selector switch used to step through all four voltage ranges POWER Switch is used to turn the power on or off to the instrument TEST pushbutton is a round sealed switch This pushbutton switch turns on the power to the unit A LED is provided to indicate that the test voltage is on DISPLAY is a 3 1 2 digit LCD displaying readings from 1 999 to 199 9 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 1 2 TEGAM INSTRUMENT DESCRIPTION TEST VOLTAGE Jack is recessed to prevent any accidental encounter Three Binding Posts for connection of test leads are marked SIG Signal GUARD and GND Ground Proper connections to the resistor under test are described in Section 2 2 below WARNING DO NOT TOUCH THE BINDING POSTS WH
23. fed to pin 10 of Ui where it is compared with the selected reference voltage If the divided output is higher than the reference the output pin 8 of U1 goes more positive increasing the base current drive to Q1 Since this is a shunt regulator the output high voltage decreases until an equilibrium point is reached Thus the high voltage is regulated at the selected value When a resistor is not being tested S3 the 5 switch is closed shorting out the high voltage This also provides added safety in the event that the external circuit under test contains capacitors If so they will be charged during TEST but discharged automatically as soon as S3 is released 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 4 1 TEGAM PRINCIPLES OPERATION When the TEST switch S3 is pressed the high voltage is no longer shorted out and it will be outputted at the TEST jack Current will then flow through the resistor under test to the SIG binding post and then to the wiper of 52 the OHMS RANGE selector switch This current then passes through the selected resistor R16 through R21 The IR drop generated shows up as a negative voltage at the output pin 6 of U3 U3 is an extremely low bias current amplifier so that less than 1 pA is diverted into its input Also the protection diodes Q5 and Q6 are low leakage transistors Thus even currents as low as 1 nA generated by a
24. he shorting link on the GROUND binding post may be swung around and connected to the GUARD binding post to ground the R1M A circuitry This may be done only if there is no external voltage with respect to ground on the measured resistor or guard 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 2 2 TEGAM PREPARATION FOR USE AND INSTALLATION O O MADE IN THE U S A TO THE DUT GUARD FLOATING IF GUARD 15 NOT AVAILABLE TERMINAL LEFT 5 a Figure 1 Connection Diagram 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 2 3 OPERATING INSTRUCTIONS 5 SECTION 3 OPERATING INSTRUCTIONS The R1M A is designed for bench top or field operation Use the cables connecting their banana plug terminations to the appropriate connectors explained in Section 2 2 WARNING DO NOT TOUCH ANY ALIGATOR CLIP WHILE DEPRESSING THE TEST PUSHBUTTON LETHAL VOLTAGES MAY BE PRESENT ON THESE CLIPS 3 1 Rotary Switch Functions The two rotary switches manually scroll through the six resistance and four voltage ranges Full scale on any range may be described as 2 000 actually 1 999 since this is a 3 digit meter If the readings are exceeding 1 999 counts step to the next higher range If the readings are less than 2 000 counts step down a range so that it will read 1 999 counts or less The decimal point is located automatically for the
25. ions In order to exercise this warranty TEGAM Inc must be notified of the defective product before the expiration of the warranty period The customer shall be responsible for packaging and shipping the product to the designated TEGAM service center with shipping charges prepaid TEGAM Inc shall pay for the return of the product to the customer if the shipment is to a location within the country in which the TEGAM service center is located The customer shall be responsible for paying all shipping duties taxes and additional costs if the product is transported to any other locations Repaired products are warranted for the remaining balance of the original warranty or 90 days whichever period is longer 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 6 3 TEGAM SERVICE INFORMATION Warranty Limitations The TEGAM Inc warranty does not apply to defects resulting from unauthorized modification or misuse of the product or any part This warranty does not apply to fuses batteries or damage to the instrument caused by battery leakage The foregoing warranty of TEGAM is in lieu of all other warranties expressed or implied TEGAM specifically disclaims any implied warranties of merchantability or fitness for a particular purpose In no event will TEGAM be liable for special or consequential damages Purchaser s sole and exclusive remedy in the event any item fails to comply with the fo
26. it must be extracted carefully to avoid catching the internal boards on the retaining brackets For calibration only it is not necessary to separate the printed circuit boards There are three trimpots on the lower edge of the display board which may be adjusted for calibration WARNING USE EXTREME CARE IN HANDLING THIS UNIT EVEN WITHOUT OPERATING THE TEST PUSHBUTTON THERE ARE VERY HIGH VOLTAGES PRESENT THEY COULD BE LETHAL 1 Connect the power cord and remove the test cables Set the test voltage to 50 V and the Ohms range to 1 GQ 2 To adjust R29 see Figures 7a and 8 connect the voltmeter Low lead to R27 the side closest to D6 Connect the High lead to R26 the side between R26 and R20 Turn the power on DO NOT TOUCH ANYTHING EXCEPT THE SCREW ADJUSTMENT OF R29 Adjust R29 for 0 0 1 V on the voltmeter Turn the power off 3 To adjust R32 connect the voltmeter High lead to R22 the side closest to S1 Turn the power on DO NOT TOUCH ANYTHING EXCEPT THE SCREW ADJUSTMENT OF R32 Adjust R32 for 0 0 1 V on the voltmeter Turn the power off and remove the voltmeter leads 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 5 3 4 adjust R14 connect the test leads to 1 GQ resistor and set the voltage switch to 100 V Turn the power on Very carefully operate the Test pushbutton and adjust R14 so that the display reads between 0 990 and 1 010 GQ
27. ltage Note that the red LED will light indicating that high voltage is present on the terminal Allow for a brief settling time and read the resistance on the digital display Note that the operating range of resistance values which may be read on any given range extends from 596 to 199 996 of the nominal value of the selected range Note that readings greater than 100 will take more time Thus the 1 range may be used to measure resistors from 50 to 1 999 Note that the test voltage must be 50 V for resistances less than 1 If the resistance measured exceeds the maximum value for the selected range the display will show blanks in that case set the range switch to a higher range If the resistance measured is less than 5 of the nominal value of the selected range the display show a minus sign if so switch to a lower range since the readings may be inaccurate If readings are noisy especially at very high values of resistance it may be caused by 60 Hz coupled to the test resistance from the power line Note that at 100 GQ an extremely small capacitance will couple many volts into the test resistance from a power line If so it may be necessary to interpose a grounded shield plate or to put the unknown resistor into a metal box connected to the GUARD alligator clip To close up the R1M A first reattach the lid to the main case if it has been removed Then store the power cord and test cables in the sid
28. nt If any items are missing notify the shipper if this is a new instrument If not new contact the previous user to locate the missing item s 2 2 Preparation for Use Release the two latches which secure the lid and open the lid Remove the power cord and the two test cables which are stored in the side compartment If desired the lid may then be removed by pushing it to the right Set the TEST VOLTAGE rotary switch to the desired value from 50 V to 500 V and set the OHMS RANGE switch to the anticipated range Note that although the OHMS RANGE switch is marked from 1 M to 100 100 over range capability is built into this instrument Note also that for resistance values less than 1 the only test voltage that should be used is 50 V No damage will occur if a higher voltage is selected but the readings may not be accurate Do not measure resistors less than 50 with the R1M A it may damage the instrument WARNING SHORTING THE TEST and SIGNAL LEADS TOGETHER WILL CAUSE INSTRUMENT DAMAGE 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 2 1 TEGAM PREPARATION FOR USE AND INSTALLATION Power Up Plug the power cord into a source of AC power 103 5 V to 129 V at 50 Hz or 60 Hz Check that the other end is plugged securely into the power input receptacle on the front panel and turn on the POWER toggle switch Connections to DUT One test cabl
29. ower supply voltages and check or replace fuse Check for 6 V If not trace amp replace bad part Check for 6 V If not trace amp replace bad part not Accurate U4 or U5 Replace U4 or U5 No Test Voltage 1 Check for 360 VAC pins 7 8 07 8 07 8 23 24 23 24 R37 Replace R37 1 M9 Range not R21 Replace R21 Accurate 10 MQ Range not R20 Replace R20 Accurate 100 MO Range R19 Replace R19 not Accurate 1 GQ Range not R18 Replace R18 Accurate 10 GQ Range not R17 Replace R17 Accurate 100 GQ Range R16 Replace R16 Error with some test voltages U1 S1 R22 25 Replace bad part Ohm readings too high or too low R14 Adjustment Adjust R14 Table 2 Fault Symptoms and Repair Actions After trouble shooting and repair the instrument must be recalibrated in accordance with 5 5 above 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 salesetegam com 5 5 5 7 Preparation for Shipment The original shipping carton is not reusable The two test cables and line cord should be stored in the side compartment and the lid closed and latched The Model R1M AR is a rugged instrument and requires no special covering preservation or special cradles Packaging must provide sufficient resilient material in accordance with standard packaging practices to prevent excessive shock to
30. regoing express warranty of TEGAM shall be to return the item to TEGAM shipping charges prepaid and at the option of TEGAM obtain a replacement item or a refund of the purchase price Statement of Calibration This instrument has been inspected and tested in accordance with specifications published by TEGAM Inc The accuracy and calibration of this instrument are traceable to the National Institute of Standards and Technology through equipment which is calibrated at planned intervals by comparison to certified standards maintained the laboratories of TEGAM Inc Contact Information TEGAM INC 10 TEGAM WAY GENEVA OHIO 44041 CAGE Code 49374 WEB http www tegam com 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 6 4
31. the power supply and display during shipment 5 8 Overhaul Instructions The R1M A is an all solid state unit and requires no periodic overhaul other than routine cleaning inspection of cables per section 5 and calibration per section 5 5 Tools and test equipment used for disassembly calibration and troubleshooting of the R1M A are listed in section 5 3 Troubleshooting suggestions are given in section 5 6 10 TEGAM WAY GENEVA OHIO 44041 e 440 466 6100 FAX 440 466 6110 sales tegam com 5 6 7 Digit Display Power switch Test Voltage Range Switch Test Voltage Ohms Range Switch Jack Signal 4 Guard amp Ground EN Binding Posts Voltage Present Test Pushbutton LED Figure 2 Front Panel Controls 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 E um Front Panel Rear View SCALE Notto Scale Figure 3 Front Panel Rear View 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 salesetegam com 5 8 190718 031 705 Er ONI 1 8 YING 03121145 1579172 891 gor 3133 22 OYNSIS NN 29280 32N343438 000 1 5 130120 1531 290170 YUVA VANCI 271 Li QYY 60 7415 00 Figure 4 Simplified Block Diagr
32. to indicate that the resistor is too small for the selected range and a smaller range should be selected 04 is a 3 digit A D converter and LCD driver functioning as a digital voltmeter However since the test current and voltage are inversely proportional to the test resistance the digital voltmeter is operated as a ratio meter with a fixed DC voltage as the normal input to pin 31 and the test voltage signal connected to the normal reference input pin 36 U5 is a 3 digit liquid crystal display driven segment by segment by U4 S2B provides the proper logic levels to the quad exclusive or gate U6 to locate the decimal point on the display R33 34 and 35 are pull down resistors 10 TEGAM WAY GENEVA OHIO 44041 440 466 6100 FAX 440 466 6110 sales tegam com 4 3 SECTION 5 MAINTENANCE 5 1 Inspection These units should be inspected semi annually Cables should be periodically inspected to make sure they are in good condition Check that the pushbutton and rotary switches operate smoothly Check all four binding posts to ensure that they operate smoothly Check that the case opens and closes with no binding 5 2 Cleaning The instrument should be cleaned periodically as is necessary using mild soap and a damp cloth both followed by second damp rinsing cloth Clean the LCD window using a soft cloth moistened with water or Windex type window cleaner DO NOT use common paper towel products as some
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