DATA PRECISION 1350 Instruction Manual Download

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Summary of Contents for 1350

Page 1: ...62 5008 Instruction Manual M0DEL1350 3 1 2 DIGIT QENERALPURPOSEDIGITALMULTIMETER kpHoAIAPRECISION years ahead...

Page 2: ...data of the Data Precision Corporation This informa tion has been prepared for the express purpose of assisting operating and maintenance personnel in the efficient use of the instrument described her...

Page 3: ...OPERATION 2 1 General 2 2 Unpacking Repacking 2 3 Front Panel Controls Indicators 2 4 Rear Panel Features 2 5 Signal Connections 2 6 Making A Measurement 2 7 Application Notes 2 7 1 General 2 7 2 Avo...

Page 4: ...ails 4 5 1 Analog Section 4 5 2 Digital Section 4 6 Display 4 7 Power Supply 4 8 Reference Supply 5 MAINTENANCE 5 1 General 5 2 Trouble Shooting Strategy 5 3 Access to Model 1350 DMM Assemblies Test P...

Page 6: ...econds High common mode rejection of 140dB at dc and over 120dB at 50 and 60Hz enhance the applications in harsh industrial environments The display of 0 43 1 1 cm LED digits provide excellent visibil...

Page 7: ...Range Overrange Resolution 100 0 mVDC 199 9 100 xV 1 000 VDC 1 999 ImV 10 00 VDC 19 99 lOmV 100 0 VDC 199 9 lOOmV 1000 VDC 1200 IV Input Impedance lOMfi all ranges Maximum Voltage 1200VDC all ranges 6...

Page 8: ...C 5 C Range 30 50HZ 50 500HZ lOOmV 1 5 isd 5 2 Isd 1 V 1 5 Isd 5 2 Isd 10 V 1 5 Isd 5 2 Isd 100 V 1 5 Isd 5 2 Isd 1000 V 1 5 Isd 75 2 Isd 500 1GODHz 1000 2000HZ 2kHz 10kHz 1 2 Isd 1 2 Isd 1 2 Isd 1 2...

Page 9: ...Maximum Open Cir cuit Voltage Temperature Coefficient 0 C to 40 C lOO Onto lOOO kfi lOMil Maximum Test Current 1 4mA Maximum Input Voltage 500V RMS AC or DC Settling Time lOO Onto lOOOkn lOMfl 2 8V 0...

Page 10: ...1999 mA 1mA Maximum Current Series 2A fuse 250V Nominal Full Scale Voltage across Shunts lOOmV RMS Accuracy 1 year 23 C 5 C 30Hz to 50Hz 50Hz to 500Hz 500Hz to 2kHz Temperature Coefficient 30Hz to 2kH...

Page 11: ...D X 2W H Including Handles Weight 3V4lb 1 5kg Display 3V2 Digit 43 1 1 cm LED Switches Eleven 11 Pushbuttons in Three 3 Groups 1 On Off 2 Mode V kn mA AC DC Hin LoD 3 Range 1 1 10 100 1000 lOMft Conn...

Page 12: ...Precision distributors Data Precision Description Model No Test Leads T5 Rack Mount L R or Dual L75 R75 D75 High Voltage Probe to40KV V41A Current Probe to 150Amp IP151 E Z Hooks Probe attachments E Z...

Page 13: ...he operator to refer to the Instruction manual before using these temlnals Located to the right of terminal V Kil This warns the operator that there may be dangerously high voltage at this location or...

Page 14: ...pment and report immediately to the carrier Fill out and return the warranty card to regis ter your instrument and to establish your warranty service interval c Accessories such as spare leads or high...

Page 15: ...input signals up to 2 amperes 4 Range Selector 6interlocked pushbuttons with panel markings identifying the magnitude and unit of the selected range scale Range selection automatically positions the...

Page 16: ...5008 MODEL 1350 v kn 100 noo mk TA PRECI Figure 2 2 Model 1350 DMM Front Panel Features 2 4 Figure 2 3 Model 1350 DMM Rear Panel Features Copyright 1977 Data Precision Corporation All rights reserved...

Page 17: ...test leads is furnished as a standard accessory with each Model 1350 Digital Multimeter A banana plug connector at one end mates with the Model 1350 Digital Multimeter front panel input connec tor whi...

Page 18: ...ead value on the display directly in terms of the units of selected measuring function Polarity for dc measurements is displayed auto matically indicating the relative value ofthe HI input with respec...

Page 19: ...in establishing the test measurement conditions The few hints included in these paragraphs are only indica tive of the types of measuring environment problems which may influ ence the meter performanc...

Page 20: ...50 5 IMODEL 1350 COMMON MODE VOLTAGE SIGNAL SOURCE Figure 2 4 Ground Loops in Grounded Measurements MODEL 2 8 Figure 2 5 Noise Coupling in AC Measurements Copyright 1977 Data Precision Corporation All...

Page 21: ...keptto a minimum under these circum stances by keeping the lead asshort as possible do not use any exten sions on the probes and by twisting the probe leads so asto equalize any field effects on the s...

Page 22: ...4 H HI input is 1 234 volts more positive than LO input HI input is more than 199 9 volts more positive than LO input ACV 100 lOOmV 123 4 123 4 AC input is 123 4V RMS AC input is 123 4mV RMS kfi Lo 10...

Page 23: ...cuit that programs the dual slope integrating A D converter be driven by an accurately adjusted oscillator to assure maximum re jection of power supply correlated noise 2 that the reference be adjuste...

Page 24: ...nj irij vn n n 0 0 era era 0 0 OO nQIIOn n n rUD 11 f S r ets oi O c o i O R38 BALANCE Figure 3 1 Location of Calibration Adjustments Display Ribbon Connector not Shown 3 2 Copyright 1977 Data Pracist...

Page 25: ...rate 0to10V 0 05 Analogic 3100 Perform calibration in sequence below b Time Base Calibration 1 Reconnect ac power to Model 1350 Turn power ON Observe CAUTION 2 Connectfrequency counter high impedance...

Page 26: ...i er OFF d Balance Calibration 1 Connect input at front panel J400 to Z2 36 REF HI 2 Select DCV Range lOOmV 3 Adjust R38for display value of 50 50 mV 1 Connect input atfront panel J400 to Z2 36 REF HI...

Page 27: ...ther by passes or is connected to the AC DC converter as determined by the front panel selection of dc or ac respectively The resulting dc signal at a sensitivity of 0 1 volts per 1000 counts is one i...

Page 28: ...lON CONDITIONING MODE SELECT RANGE SELECT POWER SOURCE REFERENCE VOLTAGE GENERATOR A D CONVERTER DRIVERS r 4 POLARITY DISPLAY ENABLE 1 DECIMALPOINT SWITCHING Figure 4 1 Model 1350 DMM System Block Dia...

Page 29: ...grammed to last 100 millisec onds the analog section of the converter is zeroed by closing the loop around the components and storing a compensating voltage to balance the no zero effects in the loop...

Page 30: ...range signals the control signals switch the circuit Into autozero action for the balance ofthis step This autozero Ing Is In addition to the autozero of Step 1 The timing diagram of Figure 4 2summar...

Page 31: ...o L V TO AC DC SELECT OVERLOAD PROTECT Figure 4 4 DCmA Signal Conditioning Simplified Schematic RANGE IRANGE I I 900K VOLTAGE ATTENUATOR V SELECT Figure 4 3 DCV Signal Conditioning Simplified Schemati...

Page 32: ...NVERTER DETAILS 4 5 1 Analog Section The Model 1350 DMM ND converter is a monolithic CMOS 10containing both analog and digital sections on one chip Figure 4 7 illustrates the analog section and includ...

Page 33: ...W HI R18 Sri9 AC CONDITIONiNG SELECT 1 Figure 4 5 AC DC Signal Conditioning Simplified Schematic I o V i f 1 LO VOLTAGE SOURCE RANGE Figure 4 6 Resistance Signal Conditioning Simplified Schematic Copv...

Page 34: ...section ofthe A D Converter contains counters and logic cir cuitry with which to developthe3 steptiming signalsand togeneratedriv ing signalsfor each ofthe seven segmentsofthe 3full decades as well as...

Page 35: ...mmon and the Digital Ground reference for the i 5V Refer to the fold out reference schematic for design details described below b Transformer T2supplies current through full wave rectifiers CR11 and C...

Page 36: ...RIO This tOOmV refer ence is approximately centered i 50mV and 50mV around Analog Common by choice of the values of RB and R10 Individual meters may include R31 and R32 R31 will raise the display rea...

Page 37: ...unction Such a strategy begins with an analysis of the symptoms of malfunction in order to keep to a minimum the repair and replacement operations within the meter assembly Much can be learned from an...

Page 38: ...T ONLY NG CHECK DIGIT DRIVER Z2 A2 V OR mA ONLY NG NOT BOTH mAONLY CHECK RTl RV A3 DC OK AC NG CHECK AC DC CONVERTER CHECK F301 CHECK SHUNT CRl 4 SYMPTOM GONE NO SIGN OF OPERATION CHECK LINE CORD POWE...

Page 39: ...on plastic nuts holding the display flex to the front panel assembly Figure 5 2 and lift the display above the main pac card to allow access to the parts and component test nodes on the card b Figure...

Page 40: ...SPLAY REAR PANEL ASSEMBLY RIBBON CONNECTOR CABLE MAIN PC BOARn ASSEMBLY I RONT PANEL ASSEMBLY Figure 5 2 Model 1350 DMM Major Assemblies Top Cover Removed 5 4 Copyright 1977 Data Precision Corporation...

Page 41: ...yi u u cyji UiJ CU I y i u JjJ LKJ 1 aSfei iijj n D 1 j l l 1 1 l l isi f 5D 3D o o J5 fe i 2 C EZ l3 7 jm ei l r f V v 11 s R38 BALANCE Figure 5 3 Test Points for Trouble Sfiooting Underside in Plian...

Page 42: ...ts of Voltage reg ulator Z7 It assumesthatthe linefuse has been checked perthe proce dure of Figure 5 1 and as indicated in paragraph 5 2 Note that all dc level measurements are to be made with respec...

Page 43: ...rd 1 VRMS signal a 500 Hz is connected to the input and the performance of the meter is checked as the input is conditioned to a proportional dc level for the A D converter input The waveforms to be u...

Page 44: ...gnosis checks the operation ofthe phase switching by examining the waveform at the input to the pre integration buffer amplifier The switching action should illus tratethe3conversion stepsthat result...

Page 45: ...clear any symptom of malfunction then the trouble may lie in the remaining active circuitry the display or in the mechanical components not yet checked Many of the display malfunctionsshould be detec...

Page 46: ...RT1 RV 1 5 Z2 TO DISPLAY TROUBLE SHOOTING TEXT Figure 5 7 A D Converter Trouble Shooting Flow Diagram 5 10 REPLACEABLE PARTS Chapter6lists the replaceable electronic parts that should be used when re...

Page 47: ...PUT 1 VAC 500HZ HIGH SIDE OF R20 ImSEC CIVI 0 1V CM TP6 1V CM lO uSEC CM ANODE CR9 TOP CATHODE CR9 INPUT 1VDC Z2 27 1V CM Z2 28 50 mSEC CM Figure 5 8 Waveforms for Trouble Shooting Procedures 5 11 Cop...

Page 48: ...L 23 610015 0R1 THRU0R4 DIODE A14U RECTIFIER 24 102001 0R5THRUOR10 13 18 IN4148 SILICON 24 110001 0R11 12 16 IN4004 RECTIFIER 24 104004 OR14 17 IN754 ZENER 24 120078 0R15 DIODE IN4577 REF 6 4V 24 1300...

Page 49: ...R36 1000 2W 5 C 22 051019 R38 RE8I8TOR TRIM 5000 TOP AOJ 22 673501 RT1 THERMISTOR 1K 500V POSITIVE 22 991001 RV1 THRU RV4 VARI8T0R 22 980001 S6 THRU 811 RANGE SWITCH SPEC 068 1022 81 THRU 85 MODE SWIT...

Page 50: ...19 1 ZZOK V ion wv wv vw S5 F30 urr MS CZ 7 07 A D rAVi pnr S t O w f 7 3d C 0 l f COMMtN z ov 0 5 C 9 72 A3 fe 90J1 I i I S 3 1 5 7 C y e a t A3 T f 7 CJfO S470M A W j i r i it 3 wrez CA iS V7S serro...

Page 51: ...ECISION CORP FINAL ACCEPTANCE TESTS Model No 1351 Serial No Final ReportAcceptemce By Date iyi9 S 3 Before performing any measurements lift 12 inches above horizontal wooden bench top Let the chassis...

Page 52: ...CALIBRATION Select OHMS Modes HiV or LoV as Indicated Range Input Spec Limits Measurements 100 0 ohm HiV 0 00 3 00 0 00 100 0 ohm HiV 100 0 ohm 100 5 99 5 l OOO tohn HiV 1 000k 1 002 998 lO OOkohm HiV...

Page 53: ...INAL ACCEPTANCE TESTS Model No 135 jy Serial No V Final Ref ort Acceptance By DROP TEST Before performing any measurements lift 12 inches above horizontal wooden bench top Let the chassis drop back fr...

Page 54: ...Select OHMS Modes HlV or LoV as indicated Range Input Spec Limits Measurements 100 0 ohiB HiV 0 00 3 00 0 00 100 0 ohD HiV 100 0 ohm 100 5 99 S l OOO cohm HiV 1 000 t 1 002 998 lO OO toha HiV 10 00 c...

Page 55: ...FINAL ACCEPTANCE TESTS Model No 1351 Serial No Final Report cceptance By m Date Before performing any measurements lift 12 inches above horizontal wooden bench top Let the chassis drop back freely to...

Page 56: ...CALIBRATION Select OHMS Nodes HiV or LoV ss indicated Range Input Spec Limits Measurements 100 0 ohm HiV 0 00 3 00 0 00 100 0 ohm HiV 100 0 ohm 100 S 99 S l OOOkohn HiV 1 000k 1 002 998 lO OOkohm HiV...

Page 57: ...TA PRECISION CORP FINAL ACCEPTANCE TESTS omL Model No 1351 Serial No Final Repor Acceptance By Date 19 SZ Before performing any measurements lift 12 inches above horizontal wooden bench top Let the ch...

Page 58: ...LIBRATION Select OHMS Modes HiV or LoV as indicated Range Input Spec Liaits Measurements 100 0 ohm HiV 0 00 3 00 0 00 100 0 ohB HiV 100 0 ohm 100 5 99 5 l OOOkohm HiV 1 000k 1 002 998 lO OO cohm HiV l...

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