Tektronix DM 504A Instruction Manual
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Tektronix DM 504A Instruction Manual

Auto ranging digital multimeter
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DM
504A
Auto Ranging
Digital
Multi meter

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Summary of Contents for Tektronix DM 504A

  • Page 1 504A Auto Ranging Digital Multi meter...
  • Page 2 INSTRUCTIONS UNLESS QUALIFIED TO DO SO. REFER TO THE SERVICE SAFETY SUM­ MARY PRIOR TO PERFORMING ANY SERVICE. PLEASE CHECK FOR CHANGE INFORMATION AT THE REAR OF THIS MANUAL. DM 504A Auto Ranging Digital Multi meter Service Tektronix, Inc. P.O. Box 500...
  • Page 3 � TEKTRONIX, TEK, SCOPE - M OB I LE, and registered trademarks of Tektronix, Inc. TELEQ UIPMENT is a registered trademark of Tektronix U .K . Limited. Printed in U. S .A. Specification and price change privileges are reserved .

  • Page 4: Table Of Contents

    DM 504A TA BLE OF CONTENTS Page LIST OF ILLUSTRATIONS • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •...
  • Page 5 Schematic Diagrams Parts Location Grids and Reference Tables Section 7 REPLACEABLE MECHANICAL PARTS Exploded View Accessories CHANGE INFORMATION LIST OF ILLUSTRATIONS Page Figure 1 -1 DM 504A Block Diagram 1 -1 • • • • • • • • •...
  • Page 6 DM 504A LIST OF TABLES Table Page 1 -1 DC VOLTAGE RELAY LOGIC 1 -2 1 -2 DC CURRENT RELAY LOGIC 1 -3 1 -3 OHMS RELAY LOGIC 1 -3 1 -4 AC VOLTAGE C I RC U ITRY FULL-SCALE SENSITIVITY...
  • Page 7 SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Refer also to the Operators Safety Summary in the DM 504A Operators Manual DO NOT SERVICE ALONE Do not pertorm internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present.

  • Page 8: Sect I O N 1 Theory Of Operation

    U 1 . ture. Figure 1 -1 is a block diagram of the DM 504A. DC VOLTAGE CIRCUITRY ANAL OG-TO-DIGITAL CONVERTOR DC voltages are applied to the V/0.

  • Page 9: Dc Current Circuitry

    T heo ry of O peration-OM 504A In the 20 V and 200 V ranges, relay K1 02 is ac­ DC CURRENT CIRCUITRY tivated and the DC voltage is connected to pin 1 of DC current is applied to the rnA and LOW input con­ U 1 02.

  • Page 10: Ac Voltage Circuitry

    Th eo ry of Op eration -OM 504A Tab l e 1 -2 DC CURRENT RELAY LOGIC K1 00 K1 01 K1 02 K103 A/D S ensiti vity 200 j.JA 200 mV 2 rnA 200 mV 20 rnA 200 mV 200 rnA 200 mV 2000 rnA...

  • Page 11: Ac Current Circuitry

    504A T heo ry of Operation-OM TRUE R M S-TO-OC ATTENUATOR CONVERTER R 1 00 U 1 0 1 ® ® R114 K100SB 71 35-3 1·3 Fig. Simplified voltage measurement circuitry Table 1 ·4 AC V OLTAGE CIRCU ITRY FULL-SCALE S ENS ITIV ITY K1 00SB Status 200 mv 200 mV...

  • Page 12: Digital Circuitry

    R 1 01 circuits. U1 also generates commands to correctly 20 rnA Range: R 1 01 .2 configure the DM 504A. The program for U1 is stored 200 rnA Range: R 1 01 .6 in EPROM U2. 2000 rnA Range : R 1 01 .5...

  • Page 13: Ac Curr Ent Circuitry Full-Scale Sensitivity

    Theory of Operation-OM 504A Table 1 -6 AC C U R R ENT C I R C U ITRY FU LL-SCALE SEN SITIVITY 200 � 200 mV 200 mV 2 rnA 200 mV 200 mV 20 rnA 200 mv 200 mV 200 mv 200 mV 200 rna...

  • Page 14: Display Circuitry

    Th eo ry of Op eration -OM 504A The input for the display circuit is the serial input at DIS PL AY CIRCUITRY P200-3 from the microcontroller. Shift registers U200 Five seven-segment display modules (U203-U207) and U201 are cleared at the start of the strobe pulse. and 1 2 LEOs ( OS200-21 1 ) are used by the The display data is then clocked into these shift microcontroller to display the instrument's measure­...

  • Page 16: Sect Ion 2 Calibration

    DM 504A Operator's Manual. the factory service center. Contact your local form the calibration procedure if the instrument fails Tektronix field office or representative for further in­ to meet performance requirements. formation. CALI BRAT ION INTERVAL PER FORM ANCE CAL I BRATION...
  • Page 17 Exercise caution. Do not touch the output connectors of the voltage calibrator, the input terminals of the DM 504A, or the in­ Possible readout messages during calibration are ternal circuitry of the DM 504A. shown in Table 2-2.

  • Page 18: Calibration Messages

    Calibration-OM 504A During calibration you should keep the following in­ Measurement ranges can only be selected • manually. formation in mind: Calibrating a particular range does not effect The AUTO LED readout blinks during calibra­ • • other ranges. tion. Table 2·2 CALI B R ATION MESSAGES Problem and/or Suggested Action...

  • Page 19: Dc Voltage Offset Calibration Factors

    Calibration-OM 504A r. Set the DM 504A in the 200 V, DC range and u. Press the UP and DOWN push buttons simul­ apply +1 90.000 V from the DC voltage calibrator taneously. to the LOW and Volts/n connectors. v. Repeat steps n through u, but change the ap­...

  • Page 20: Ohms Offset Calibration Factor

    Calibration-OM 504A 2. Adjust the Ohms Offset Calibration Factors a. Set the OM 504A in the 200 beeper range. e. The readout returns to 0.0 o after a few seconds. The offset in the beeper mode is now b. Short circuit the LOW and Volts/0 connectors calibrated.

  • Page 21: Ohms Gain Calibration Factors

    DOWN + UP 1 0.000 Mn 4. Adjust DC Current Offset Accuracy a. Set the DM 504A in the DC mode, 200 J.1.A c. After a few seconds the readout returns to range. 0.00. The offset current calibration for the 200 J.1.A range is complete (see Table 2-7) .

  • Page 22: Dc Current Gain Factors

    Calibration-OM 504A Table 2·8 DC C U R R E NT G A I N FACTORS OM 504A Range Press J,1A J,1A J,1A +200 +1 90.000 DOWN + +1 90.00 +2 mA +1 .90000 DOWN + +1 .9000 rnA +20 mA +19.0000 DOWN + +19.000...

  • Page 23: Ac Volt Age Gain Factors

    Adjust trimmer for the same readout reading pensation is indicated in Fig. 2-2. as in the AC, 1 8.000 V, 300 Hz position. a. Set the DM 504A to the AC mode, 20 V range. f. Repeat steps b through e necessary. The DM 504A is now frequency compensated.
  • Page 24 Calibration-OM 504A Table 2·9 (Cont .) AC VOLTAGE GAIN FACTORS OM 504A Range 1 00% FS ln�ut 20% FS ln�ut Press 500 v DOWN + UP 500? 1 00.0 v 1 00 v (approx.) 500 v 500.00 v DOWN + UP DONE 500.0 v g.

  • Page 25: Ac Current Gain Factors

    DOWN + UP DONE 1 900.0 rnA 9. Adjust the Temperature Accuracy a. Set the DM 504A in the Temperature mode. g. Remove the temperature probe from the o· temperature bath and allow the probe to warm b. Connect the temperature probe to the Volts/.n to +20"...

  • Page 26: Sect Ion 3 Maintenance

    Use a non-residue type of cleaner; preferable isopropyl nection while handling these components. alcohol or denatured ethyl alcohol. Before using any other type of cleaner consult your Tektronix Service 4. Do not allow anything on your workstation Center or representative.
  • Page 28 (070-6945-00) OM 504A Operators Manual Test Leads ( 1 96-321 2-00) O ptions The DM 504A can be ordered with the following option: OM 504A calibrated with a Tektronix P6602 Temperature Probe. Option 1 O ptional A ccessories Tektronix P6602 Temperature Probe...
  • Page 30 If a part you have ordered has been replaced with a new or assemblies and parts) . i m proved part. your local Tektronix. I nc . Field Office or represen­ tative will contact you concerni ng any change in part n u m ber.
  • Page 31 01123 RHRLOG DEUICES 11£0ERLRHD BEHELU�£6 27 021 02 RURIEII A OOORHRKKERSUEG 26 5612 HP EIHDHDUEH,HOLLRHO 03901 TEKTRONIX IHC P 0 BOX 500 97077 BERUERTOH,OR£60N,USR 1 1 1 02 BOURNS HEDERLRHO P 0 BOX 37 2270 RR UOORBURG ,HOLLRHO 1 1808...
  • Page 32 R�plac�able [lectrical Parts - 111 S01A HII1E 8 DESCRI PTI OH C111P O H£HT TEKTRONIX SERIAl HO SERIRl HO PRRT HO. EffECTIUE DISCOHT. CODE -------------------------------------------------------------------------------------------------- RI O 671 -0647-00 BOARD RSSY IIRIH IJ1501A 8253S Al l 671 -0618-00 BOARD RSSV DISPlAY 111 5 018...
  • Page 33 Replaceable Electrical Parts - Ill 501R Hlt1E 8 OESCRI PTI OH CIII P OHEHT HO. TEKTRONIX SERIAL HO SERIAL HO PART HO. EffECTIUE DISCOHT . CODE --------------------------- ---------------- ---------------- ----------------- ----------------- ----------- R1 0C121 281 -0826-00 CRP fXO CER DI 2200pf I 0% I OOU T UBULAR 61101 SEMI COHO OUC DI SIJ SI 30U 1 5�A 30U...
  • Page 34 Ill 501R Replaceable Electrical Parts Hill E a D£SCRIPTIOH SERIAL HO S£RIRL HO llfR CIJIPOHEHT HO. T£KTROHIX PRRT HO. Erf[[TIU[ OISCOHT . COD£ ---------------------------------------------------------------------------------------------------------- fXD fiLII R10R1 1 3 321 -0289-07 1 OKolrl . 1 % . 1 25U 65606 R10R1 1 1 321 -171 8-07 l .
  • Page 35 Replaceable £1ectrical Parts - 111 50iR Hill E a DESCRIPTIOH SERIAL HO SERIAL HO CII1POHEHT HO. T£KTROHIX 11fR PART HO. EffECTIUE DISCOHT. CODE ------------------------------------------------------------------------------------------------------ R10UR100 1 52-1 051-00 BRH06AP REf 8069 50PPM 021 02 SEJ'IICOHO 1 K82? D07 6. 3U ZEH SI 2% . 11J R1 0UR1 01 1 52-0727-00 58301...
  • Page 36 R!placeable fl!ctrical Parts 111 501A Hll1£ R DESCRIPTION CII1POHEHT HO. TEKTRONIX SERIAL HO SERIAL HO PART HO. [ff[CTJUE CODE DISCOHT. Al l U201 1 50-1 21 1-00 DISPLRV 7SE6t1. LTS-367HR 69803 A1 1 U205 1 50-121 1-00 DI SPLRV 7S£Q1. LTS-367HR...
  • Page 38 Values less than one are in mi crofarads Other ANSI standards that are used in the preparation (pF). (0). of di agrams by Tektronix, I nc. are: Resistors O hms --- The i nf ormati on and special sym bol s below may appear in this manual.
  • Page 40 OM 504A: Table l-1 � DM504A DIGITAL CI RC U MAIN BOARD, AISI!MILY A1 0 CIRCUIT SCHEMATIC BOARD CIRCUIT SCHEMATIC BOARD NUMBER LOCATION LOCATION NUMBER LOCATION LOCATION P 1 1 -ao- C 1 0 C1 0 01 0 � � R 1 0 C1 1 2 R1 1...
  • Page 41 504A U l 05 COMPONENT NUMBER EXAMPLE LM78 1 2 8 1 J PSflfl Component Number PSlltl A I J R1234 Static Sensitive Devices Maintenance Section s�hem�tic R l 31 R ! 33 Circutt U l 06 Numbel Subasse f!! biY 6 3 1 ."'umber PSBB...
  • Page 43 DM 504A COMPONENT NUMBER 'EXAMPLE Component Number Static Sensitive Oevices /lla i ntenance Section Asse m bly: P t 0 1 Circuit · Number · Su�y Nu� Numbtr (it used) P U B ChaSsiS: mounted components have Assem ti y Number R I J I J:Wtfi•-See tnd of RepilceJb6e EJectri�...
  • Page 44 OM 504A T1ble D M504A DISPLAY 1DISPLAY BOARD, ASSEMBLY A CIRCUIT SCHEMATIC BOARD CIRCUIT SCHEMATIC BOARD NUMBER LOCATION NUMBER LOCAT ION LOCATION LOCATION OS200 0 1 1 0205 OS201 0206 OS202 0 1 0 0207 OS203 0 1 0 0208 OS204 OS205 R200...
  • Page 45 OM 504A (X 1 : 6 ) COMPONENT NUMBER EXAMPLE U204 Component Number IX l l MOHM R1234 Static Sensitive Devices Schematic ( 1 0 1 Maintenance Section Assembly ( 9 ) Circuit Num� Subassembly Number ( 8 1 Number (if us�) IX 2 l UOL T ( 5 )
  • Page 46 Replace m ent part s are available from or through your lo­ This mechanical parts list is indented to indicate item re­ cal Tektronix, Inc. Field Off i ce or representative. lationships. Foll o wing is an example of indentation sys­...
  • Page 48 Replaceable llechanical Parts-111 501R CROSS IHOEX-II f R. COOE TO IIRNUfRCT URER llfR IIFR . Hill ( ADDRESS ZIPCOOE ,CITV ,ST RT£1COUHTRV CODE 03901 T [KTROHIX I NC P 0 BOX SOO 97077 BERUERTOH , ORE SOH , USA 311 01 RICHARD HIRSCHII R H ELECTROHICR P O BOX 92 1 380 RB UEESP , HOLLRHD...
  • Page 50 Parts-111 50�R Replaceable nechani cal fiG. & TUT ROHIH SERIAL HO SERIAL HO QTV Nfl1( & DESCRIPTIOH !HOEK PRR! NO. [ff[CTIU£ I SCOH I CODE ------------·--------------------------- ---------------------------------------- ---------------------- 07D-69i5-00 USERS nRHUAl 03901 1 -1 1 05-0865-00 LATCH R£LERS£ 03901 1 05-0866-00 LRTCH R£TRIHIH6 03901 1 05-0932-00...
  • Page 51 M AN UA L CHAN G E I N FORM A TI O N At Tektronix, we continual l y strive to keep up with latest electronic developments by adding circuit and component improvements to our i nstruments as soon as they are developed and tested.
  • Page 53 MAN UAL CHANG E I N FO R M ATION Date : Change Reference : Manual Part No : DESCRIPTION H7001 01 For Serial Number and above , please make the following changes: REPLACEABLE ELECTRICAL PARTS Page 5-3 Change to: A1 0 671 -0647-01 BOARD ASSY MAI N DM504A...

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