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Содержание 1062

Страница 1: ...l Date 05 1 5 2000 Mfg DATRON Model Series 1062 1061A 1061 Document T pe Calibration Servicing Handbook Note Digital Multimeter s 0 0 13 0 Q a li CALIBRATON AND SERVICING HANDBOOK 10B1A 10B1 I N S C R...

Страница 2: ...he User s Handbook 850045 Issue For any assistance contact your nearest Datron Sales and Service center Addresses can be found at the back of this handbook Due to our policy of continuously updating o...

Страница 3: ...L DESCRIPTION 13 2 1 GENERAL 13 2 2 FRONT PANEL 13 2 3 REAR PANEL 13 2 4 EXTERNAL CONSTRUCTION 13 2 5 INTERNAL CONSTRUCTION 13 3 TECHNICAL DESCRIPTION 15 3 1 INTRODUCTION 15 3 2 ANALOG ASSEMBLY 15 3 2...

Страница 4: ...SEMBLY 30 3 4 1 Low Drift Voltage Follower 30 3 4 2 Constant Current Source 30 3 4 3 Test 31 3 5 CURRENT ASSEMBLY 31 3 5 1 Current Measurements 32 3 5 2 Test 32 3 6 REAR INPUT RATIO INPUT 32 3 6 1 Gen...

Страница 5: ...1 RAM ROM Circuit 3 12 2 Interface Circuit 3 13 REAR POWER SUPPLY PCB ASSEMBLY 48 3 13 1 General 3 13 2 180V Supply 48 3 13 3 5V Supply 48 3 13 4 15V Supply 48 3 14 SELF TEST SEQUENCE 48 4 INTERNAL A...

Страница 6: ...84 ILLUSTRATIONS AND TABLES Figure Title Page 1 1 Zero Resistance Source Connections 4 2 1 Exploded View of Instrument 14 3 1 Printed Circuit Boards Block Diagram 15 3 2 Power On Options Fitted Test 1...

Страница 7: ...3 32 Simplified Diagram of Current Assembly oo 3 33 Simplified Block Diagram of Digital Assembly oo 3 34 Job Scheduler 3 35 Two Phase Clock Generation 3 36 Timing Diagram of Stretched Two Phase Clock...

Страница 8: ...to remain at earth throughout and let the calibration source float If a Remote Guard connection is necessary then examples are shown in the Operating Manual 1 1 3 The AUTOCAL Process 1 1 3 1 General T...

Страница 9: ...ation is required for each polarity of input The two Zero calibrat ions are included to overcome a possible zero difference with the polarity setting of the DC calibration source If the DVM Reading Af...

Страница 10: ...0 000mV DC 1 Zero 0 000mV 1 digit Wait for the reading to stabilize before operating Zero 12 IV Positive Full Range 1 00 000mV DC 1 Gain 100 000V 1 digit 13 IV Range Zero O OOOmV DC 1 Zero 0 000mV 1...

Страница 11: ...d with an occasional least significant digit showing is to be expected 1 3 2 Zero Resistance Source For accurate Zero calibration on Ohms it is ESSENTIAL that a correctly connected zero source is used...

Страница 12: ...ero kl2 4 wire 10 Zero 0 0000kl2 8 lOkfi Full Range 10kl2 1 Standard Resistor kl2 4 wire 10 Gain 10 0000kl2 9 100kJ2 Range Zero 4 wire zero kl2 4 wire 100 Zero 0 000kl2 10 100kS2 Full Range 100kl2 1 S...

Страница 13: ...table repeat operation of the same CALIBRATE key is permissible to improve the readings This will be necessary with the AcHf key 1 4 2 Equipment Required A copper shorting link and an AC calibration s...

Страница 14: ...10 0000V 5 digits 9 IV Full Range LF IV rms 500Hz AC 1 Input filter Gain 1 00000V 1 digit 10 IV Full Range HF IV rms 30 kHz AC 1 Input filter AcHf 1 00000V 5 digits 11 IV Full Range LF IV rms 500 Hz A...

Страница 15: ...key Note To reduce the effect of noise at low input levels AC zero calibration is carried out at 0 1 Range and for lOOmV Range zero steps 1 2 of the table Guard is connected to Lo using a copper short...

Страница 16: ...0V rms 500Hz 500V rms 20kHz DVM Setting AC DC 1 AC 10 AC 100 AC 1000 AC 10 AC 10 AC 100 AC 100 CALIBRATE Key Zero Check only Zero Zero Gain AcHf Gain AcHf Gain Gain AcHf AC 1000 KEYBOARD 500V Gain DVM...

Страница 17: ...Autocal Standard with Option 20 1 5 3 Checking Accuracy after AUTOCAL To check the accuracy after AUTOCAL the Speci fication Verification section of the Operating Handbook will be useful It provides...

Страница 18: ...f the Operation Handbook will be useful It provides tables for quick reference of accuracy on all ranges and functions in displayed digits AC CURRENT CALIBRATION TABLE Calibration Operation Calibratio...

Страница 19: ...s a higher percentage calibration error The KEYBOARD method operates for both the Gain and AcHf calibration operations An example using KEYBOARD to calibrate directly against a Standard Cell is shown...

Страница 20: ...errupts from interface 7 check status byte S obtained by service routine prompt operator to apply calibration source on com pleting zero cal program gain cal trigger program to Internal Trigger Disabl...

Страница 21: ...oam covers The bottom cover is fitted with the tilt stand rubber feet and instruction card Earth screening of the covers and guarding is provided by aluminium plates heat staked to the inside of the c...

Страница 22: ...ON EARTH SCREEN DISPLAY DRIVER ASSEMBLY CURRENT ASSEMBLY OPTION rii ACASSEMBLY OPTION 10 See Note 1 OHMS ASSEMBLY OPTION OUTER GUARD SCREEN BOTTOM COVER ASSEMBLY R H CENTRE GUARD SCREEN FRONT PANEL AN...

Страница 23: ...nd the D A converter set up conditions A line is also provided to instruct the micro processor which options are present and if the AC assembly is measuring a signal above 5kHz 3 2 1 2 Power On At pow...

Страница 24: ...f M19 is set low if the option is fitted causing the COND VAL to be set high Note ID and lA lines logic 1 1 5 volts logic 0 5 0 volts AD lines logic 1 0 volts logic 0 5 15 volts The next step in the p...

Страница 25: ...nt Compensation AC Volts AC Assembly Frequency Compensation AC H DC Volts AC Assembly Frequency Compensation Resistance Ohms Assembly and Analog Assembly Input Bias Current Compensation DC Current Cur...

Страница 26: ...i _ 0 O 5 O IT O A 0 3 r 0 cc yj cc FIG 3 6 GENERAL FORM OF ANALOG INTERFACE UPDATE TIMING DIAGRAM Data Messages from Digital Board ANALOG INTERFACE INPUT ATTENUATOR ACTIVE FILTER GAIN NETWORK BS lnpu...

Страница 27: ...r input can never exceed approximately 24 volts The output from the DC Isolator test point TL8 is approximately 3 16 volts To for a full range 100 000 input by the following methods See Fig 3 9 lOOmV...

Страница 28: ...igh inpedance buffer which tracks the inverting input of the preamplifier The offset of M32 is adjusted so that its input is within lOO tV of the input of the preamplifier M32 thus functions as the lo...

Страница 29: ...t routine actuated from the front panel or remotely programmed the DC isolator is checked for correct operation The circuitry is placed into the 0 1V range as described in 3 2 1 3 except that relay RL...

Страница 30: ...Reset Switch Control Polarity Sense From Digital Assembly FIG 3 12 SIMPLIFIED DIAGRAM OF ANALOG SECTION OF A D CONVERTER Multiplexer M35I Control Lines Ref 1 Sig Output TPB Ref 2 Ref 1 Integrator p O...

Страница 31: ...as the signal temperature coefficient followed by opposite polarity reference and reference r 16 signals to the buffer and integrator The multiplexer is then placed in a reset condition ready for the...

Страница 32: ...ained constant whatever the input signal 3 2 3 5 Integrator The basic Integrator comprises R6 R7 and C9 with hybrid amplifier Q35 and M25 See Fig 3 17 Low noise FET pair Q35 also has low gate leakage...

Страница 33: ...set a small amount in a cycle of 16 steps See Fig 3 20 This offset is produced from the digital to analog converter M28 which is enabled by the level shifted AVE signal from M20 5 and clocked from M6...

Страница 34: ...26...

Страница 35: ...to the input of the AC assem bly If DC and AC are selected together the AC assembly becomes DC coupled by energising RL3 causing C57 the AC coupling capacitor to be by passed The signal is then fed t...

Страница 36: ...rectifier to provide the same output for non inverted or inverted asymmetric waveforms The output current from the RMS module passes into filter buffer Ml and is converted to a nominal 5 volts for a...

Страница 37: ...6 SIMPLIFIED DIAGRAM OF AC HIGH FREQUENCY COMPENSATION 3 3 5 Frequency Detection 430402 sheet 2 The signal frequency is monitored by M10 which is set so that a signal frequency greater than 5kHz cause...

Страница 38: ...with the 1000 Volt range of the DC isolator The resultant impedance presented at the input terminals is a resistance of 1ML2 shunted by 150pF Relay RL2 is energized on selection of AC directly connect...

Страница 39: ...nsing as shown in the simplified block diagram Fig A3 25 M13 and M14 form a summing full wave rectifier The output of precision half wave rectifier M13 is summed with the non inverted signal at the in...

Страница 40: ...ried out at one H F frequency but since it flattens the AC amplifier response the correction is valid for all specified frequencies It should be noted that the calibration routine is iterative since t...

Страница 41: ...onsider 2 wire measurement I i is linked to Hi I is linked to Lo and the unknown resistance linked between Hi and Lo with a constant current flowing from I t Hi through the unknown resistance R to Lo...

Страница 42: ...there is no voltage across Rz and consequently no current in Rz Voltage follower Q10 M3 will simply pass more current into Ry from the I terminal until the selected current for the particular range fl...

Страница 43: ...the output of the DC Isolator to be approx imately 5 75 volts After measurement by the A D conver ter the value is compared to the stored value If the measured signal is within 6 of the stored value t...

Страница 44: ...range signal from the DC Isolator or AC Converter is buffered by unity gain amplifier M2 The output is potentially divided by R7 and R8 so that 1 volt full range is presented to Ml another unity gain...

Страница 45: ...ired to be run and cleared when completed Priority of activation is ensured by making each job exit on completion to the top of the schedule Program Modules The program memory is split into a series o...

Страница 46: ...DAAWING No 8900 3 JIRQ 3 QATA TO DJSOl_AY 1 DRAWN JR DATE 12 1 62 DIMENSIONS IN MILLIMETRES CHECKED DATE SCALE q ts a sa APPR DATE NOT TO BE SCALED...

Страница 47: ...UPDATE CONTINUOUS AVERAGE r Q 7 i PNWY Vt CjATA value READING OR TAX OR McN CC MPuTe Ofc 107 Oni_T COTPuTE c B C 1061 ONi_y J LiMir CHECK filONLy SET OvERuOAD FLAG SET UN ITS RESOLUTION 1 SET FLAG DAT...

Страница 48: ...as the measuring circuits are not converting an input signal the state in level 1 is moved to level 2 causing the measurement circuits to update to the new state When an A D conversion is complete da...

Страница 49: ...e A8 and A9 are not decoded there are images starting at 0100 0200 0300 A further 256 bytes of 8 bit wide RAM are made up from two 256 x 4 bit RAMs M19 M20 M19 and M20 are backed up by a battery to pr...

Страница 50: ...AND A D SECTION Fig 3 37 SIMPLIFIED DIAGRAM OF MEMORY CIRCUITS...

Страница 51: ...counter output enable 0 1 1 X X X M32 9 Analog interface address latch input enable 0 0 0 X 0 0 XKDSPO M16 7 0 0 0 X 0 1 XKDSP1 Ml 6 6 i Addresses keyboard 0 0 0 X 1 0 XKDSP2 Ml 6 5 I e d latches 0 0...

Страница 52: ...the sequence completion of one stage generates the Enable for the next via M46 switches as a logic 0 state at M47 13 Timing is synchronized by Master Clock 2 positive going edges at M47 14 when M47 is...

Страница 53: ...DATA READY MESSAGE AND PUT ANALOG CIRCUIT INTO RESET 1 i PROCESSOR EXTRACTS DATA FROM MAIN COUNTERS CLEAR DATA READY LINE 1 r SIGNAL A B c RESET 1 1 0 SYNC 1 1 0 SIG 1 1 1 BIAS 0 1 1 WAIT 0 1 1 1 REF...

Страница 54: ...REF 1 is high the primary counter of M23 is enabled pin 3 and counts the period of REF 1 REF 1 is ended when a null detector pulse is detected and latched on to M22 This causes the sequencer to step...

Страница 55: ...ted to DC Isolator Lo Signals applied to the six front panel terminals are routed through to the Rear pcb to the Rear Input Ratio pcb or Rear Input pcb if Option 40 or 41 is fitted via the Signal Cabl...

Страница 56: ...ion is not being extracted from the keyboard encoders The data latches are divided into four sets M6 and M4 M8 and M5 Ml and Mil M9 being fully enabled from the XKD SP0 XKD SP3 lines respectively On i...

Страница 57: ...PROCESSOR A2 ADDRESS A1 BUS A 2 IB 2B 3B 4B SELECT 1Y 2Y 3Y 4Y R V RAM DO D1 02 D3 04 D5 D6 D7 j t h h j j I I 02 XDDSP DO 01 02 03 04 05 06 07 PROCESSOR DATA BUS FIG 3 47 DISPLAY DRIVER WRITE CIRCUIT...

Страница 58: ...o the RAM and connects the A inputs of M9 to the address lines of the RAM 3 10 2 Read Mode Discharge between adjacent display blocks is preven ted by time multiplexing and sending information to alter...

Страница 59: ...Purpose Interface Adaptor GPIA M9 provides the interface between the IEEE 488 Standard Instrument Bus and the 68000 microprocessor The MPU can receive process and send messages to the interface throu...

Страница 60: ...a operating scratch pad memory is provided by two 256x4 bit RAMS M22 M23 Both the ROM and RAM s receive the address information with chip selection being made by decoding address lines A8 A11 with XIO...

Страница 61: ...entral printed circuit board is powered from the supply gener ated from the two 8 8 volt 750mA secondary windings on transformer T1 The centre tap digital common is linked directly to line ground via...

Страница 62: ...49...

Страница 63: ...UNCORRUPTED CALIBRATION STORE CHECK FOR UNCORRUPTED INPUT ZERO STORE DISPLAY PASS CANCEL TEST KEY L E D NoV IS I FITTED TEST DCI MEASUREMENT Fail 1mA RANGE The Intrument is returned to the HOLD mode...

Страница 64: ...ry Links should be 22 SWG TIN Cu wire with silicone rubber sleeving 4 2 BATTERY REPLACEMENT The battery should be replaced on or before the date indicated on the rear panel instrument identification l...

Страница 65: ...Adjust L2 to give a stable H 05 0 03V NOTE This signal contains about 200mV peak to peak high frequency noise 13 Insert calibration key into keyswitch on the back panel and turn placing the instrumen...

Страница 66: ...nals Select ZERO 32 Apply t 10 volts and select GAIN Repeat until display reads H 0 0000 digit 33 Apply M9 volts If the display reads within the limits t 18 9999 to t19 0001 proceed to step 35 34 Calc...

Страница 67: ...s 10 This part of the procedure must be performed with the high frequency compensation voltage at Jl ll R57 at 5V 0 2V a Select AC 100V range FILTER and apply 100V 500Hz Select GAIN Apply 100V 50kHz a...

Страница 68: ...1 078 2 937 2 954 v s X X 1 072 2 954 2 973 s X v 1 065 2 973 2 988 X v X 1 059 2 988 3 004 X X v 1 054 3 004 3 021 v X X X 1 048 3 021 3 038 X s x 1 042 3 038 3 055 X v X 1 036 3 055 3 071 X x X v 1...

Страница 69: ...actor 21 Apply 1VRMS ve 5 1 Crest Factor signal Adjust R61 crest factor for a display reading of 1 00000V 30 digits 22 Apply 1VRMS ve 5 1 Crest Factor signal Check that display reading is 1 OOOOOV 30...

Страница 70: ...00V 0 7 1000V 0 m 0 DC Coupled AC Voltage Range ADO ADI AD2 1 lOOmV 0 1 1 2 lOOmV 0 1 1 3 IV 0 1 1 4 10V 0 1 0 F 100V 0 1 0 6 1000V 0 1 0 7 1000V 0 1 0 1 E T PATTERNS DC isolator AD4 AD6 AD7 0 0 1 1 X...

Страница 71: ...1 1 0 1 0 0 1 6 1A 0 0 0 0 0 1 1 X 1 1 0 0 1 0 1 7 1A 0 IB 0 0 0 1 1 X 1 1 0 0 1 0 1 9 AC Current Range AC assembly Current assembly ADO ADI AD2 AD3 AD4 ADS ADS AD7 ADO ADI AD2 AD3 AD4 ADS ADS AD7 1 l...

Страница 72: ...59 TEST...

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Страница 74: ..._ 700061 70006 70006 1000h _ 700061 I 700062 SLl E_ SWITC H SlE MEMS KerasAeb switch gfo Ltbi schacjow IC A23I 5 AbO A ISeL_ _ Eb_U keyaoA b S itch sgesKjLtbl So iAbow set S EET 7 run tATKST iSSUt ISR...

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Страница 106: ...700 S 1 M29 Z700 55 290 0 57 1 M3I 29 00 96 M32 27 0O 3 M33 270051 M34 270055 M35 29 0 0 S6 M3 28 0 0 96 M37 1 280025 M32 1 2800 7 1 M39 28 0 0 1 7 M40 29 0 0 83 M4 1 28 0 0 4 4 M42 28 0 0 03 f NOTES...

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