Datron Instruments 1062 Digital multimeter
Manufacturer:
Model:
1062
Date:
1985
Category:
Group:
Description:
5½ digit AUTOCAL Multimeter

Information

The Datron 1061 1061A and 1071 AUTOCAL multi-function, microprocessor controlled digital voltmeters (DVM) are high precision measuring instruments featuring exceptionally high stability and systems capability. The basic instrument provides full DC measurement capability, computation facilities, self check routines and calibration memory. The 1061 instrument combines high accuracy with short measurement time to maximize auability. A 5½ digit display provides a resolution of one microvolt and an accuracy of 5ppm.

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Service Manual
Manual type:
Service Manual
Pages:
202
Size:
79.53 Mbytes (83392725 Bytes)
Language:
english
Revision:
Manual ID:
850045
Date:
01 January 1984
Quality:
Scanned document, all readable.
Upload date:
24 September 2017
MD5:
505962e8482e0150e9e08e923f47b917
Downloads:
2323

Information

Calibration and Servicing Handbook GENERAL DESCRIPTION ... INSTALLATION ... I Refer to MEASUREMENT PROCEDURES ... i SPECIFICATION AND SPECIFICATION VERIFICATION ... I User's Handbook SYSTEMS APPLICATIONS ... ) Section Title Page 1 CALIBRATION ... 1 1.1 INTRODUCTION ... 1 1.1.1 General ... 1 1.1.2 Essentials for Good Calibration ... 1 1.1.3 The'AUTOCAL'Process ... 1 1.2 DC VOLTAGE CALIBRATION ... 2 1.3 OHMS CALIBRATION ... 4 1.4 AC VOLTAGE CALIBRATION - OPTION 10 ONLY ... 6 - OPTION 12 ONLY ... 7A 1.5 DC CURRENT CALIBRATION ... 8 1.6 AC CURRENT CALIBRATION ... 9 1.7 'AUTOCAL' USING 'KEYBOARD' ... 10 1.8 'AUTOCAL' OVER THE BUS ... 11 2 MECHANICAL 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 3.2.1 Analog Interface ... 15 3.2.1.1 Introduction ... 15 3.2.1.2 Power-On ... 15 3.2.1.3 General Interface Update Sequence ... 17 3.2.1.4 Test ... 17 3.2.2 DC Isolator Section ... * ... 17 3.2.2.1 Preamplifier Scaling ... 17 3.2.2.2 Preamplifier ... 20 3.2.2.3 DC Bootstrap ... 20 3.2.2.4 Filtering ... 20 3.2.2.5 Input Current Compensation ... 21 3.2.2.6 Test ... 21 3.2.3 Analog to Digital Conversion (Analog Section) ... 21 3.2.3.1 General Principles ... 21 3.2.3.2 A-D Input Control ... 23 3.2.3.3 Reference Voltages and Control Logic Power Supply ... 23 3.2.3.4 High Speed Buffer ... 24 3.2.3.5 Integrator ... 24 3.2.3.6 1st Null Detector ... 25 3.2.3.7 2nd Null Detector ... 25 3.2.3.8 Reset Period ... 25 3.3 OPTION 10 AC ASSEMBLY ... 27 3.3.1 General Principles ... 27 3.3.2 Preamplifier and Scaling ... 27 3.3.3 RMS Converter ... 28 3.3.4 High Frequency Compensation ... 29 3.3.5 Frequency Detection ... 29 3.3.6 Test ... 29 A3.3 OPTION 12 AC ASSEMBLY ... A27 A3.3.1 General Principles ... A27 A3.3.2 Preamplifier and Scaling ... A27 A3.3.3 RMS Converter ... A28 A3.3.4 High Frequency Compensation ... A29 A3.3.5 Frequency Detection ... A29 A3.3.6 Test ... A29 3.4 OHMS ASSEMBLY ... 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 General ... 32 3.6.2 Front Panel/Rear Panel Input ... 32 3.6.3 Ratio ... 32 3.6.4 Test ... 33 3.7 ANALOG OUTPUT ... 33 3.7.1 General ... 33 3.7.2 Description ... 33 3.8 DIGITAL ASSEMBLY ... 33 3.8.1 Processor and Memory ... 33 3.8.1.1 Software Overview ... 34 3.8.1.2 The Two-Phase Clock ... 35 3.8.1.3 RAM/ROM Circuit ... 36 3.8.2 CMOS Address Decode and Input/Output Circuits ... 36 3.8.3 Analog to Digital Conversion (Digital Section) ... 39 3.8.3.1 General Principle ... 39 3.8.3.2 Preset Procedure ... 39 3.8.3.3 A-D Measurement Sequence ... 41 3.8.3.4 Master Clock and Line Locking ... 41 3.9 FRONT PCB ASSEMBLY ... 42 3.9.1 Analog Input Signals ... 42 3.9.2 Display Signals ... 42 3.9.3 Keyboard Data Encode ... 42 3.9.4 Keyboard LED Data Decode ... 43 3.10 DISPLAY DRIVER ASSEMBLY ... 45 3.10.1 Write Mode ... 45 3.10.2 Read Mode ... 45 3.11 IEEE DIGITAL INTERFACE ... 46 3.11.1 ROM Circuit ... 46 3.11.2 Interface Circuit ... 46 3.12 BCD DIGITAL INTERFACE ... 47 3.12.1 RAM/ROM Circuit ... 47 3.12.2 Interface Circuit ... 47 3.13 REAR (POWER SUPPLY) PCB ASSEMBLY ... 48 3.13.1 General ... 48 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 ADJUSTMENT PROCEDURES ... 51 4.1 ALTERATION OF LINE VOLTAGE AND FREQUENCY ... 51 4.1.1 Changing Line Voltage ... 51 4.1.2 Changing Line Frequency ... 51 4.2 BATTERY REPLACEMENT ... 51 4.3 POST-REPAIR PROCEDURES ... 51 4.3.1 Basic DC Instrument ... 52 4.3.2 Ohms Assembly ... 53 4.3.3 AC Assembly (Option 10) ... 54 4.3.4 AC Assembly (Option 12) ... 55 APPENDIX 1 ANALOG DATA LINE 'F.E.T.' PATTERNS ... 57

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Service Manual
Manual type:
Service Manual
Pages:
54
Size:
2.24 Mbytes (2345970 Bytes)
Language:
english
Revision:
Issue 9
Manual ID:
850045
Date:
01 March 1985
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
29 December 2016
MD5:
aad378d515bd35ed8ddbc3a9a0866b9e
Downloads:
1290

Information

CALIBRATION AND SERVICING HANDBOOK

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