Stop electronic waste, fix it yourself

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

CALIBRATION AND SERVICING HANDBOOK

SECTIO N 1 TH E 1061/1061 A/1071 AUTOCAL INSTRUM ENTS Standard and optional measurement facilities Accessories Principles of operation SECTIO N 2 BASIC M EASUREM ENT PROCEDURES Maximum input voltages Safety Controls DC voltage measurement procedure AC voltage measurement procedure Current measurement procedure Resistance measurement procedure Rear input 61⁄2 digits (1061A only) 71⁄2 digits (1071 only) Display messages SECTIO N 3 ADVANCED OPERATIONAL PROCEDURES "Manual', external triggers and ‘Hold' Ratio measurement procedure Self test Spec mode dB measurements (1061/1061A only) Average mode measurements (1071 only) Computation facility Load/reset store (A-B) + С Max and M in procedure Limits procedure SECTIO N 4 SYSTEMS APPLICATION V IA TH E IEEE Interface Connecting the 1061/1071 into a system Address selection Using the 1061/1071 in a system Programming instructions Control of D V M inputs Control o f D V M output Service request Control of computing functions Alternative method of programming Calibration via the bus High speed readings Spec readout, test and input zero Program string characteristics Operational sequence guidelines SECTION 5 SYSTEM S APPLICATIONS VIA TH E BCD Interface (1061 only) DVM control commands BCD output interpretation SECTION 6 INSTALLATION Unpacking and inspection Preparation for operation Connectors and pin designations SECTION 7 S P EC IFIC A TIO N S General 1071 specifications 1061/1061A specifications Standard internal delays SECTION 8 SPEC IFIC A TIO N VERIFICATIO N Introduction Equipment requirements 1071 specification verification 1071 specification verification report sheet 1061 specification verification 1061 specification verification report sheet 1061A specification verification 1061A specification verification report sheet