Amptec Research 620A SERIES, Operation And Maintenance Manual

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SECTION E: THEORY OF OPERATION
SECTION F: ROUTINE MAINTENANCE
: COMPONENT PARTS LIST
: SCHEMATICS AND DIAGRAMS
: UPDATES, MODIFICATIONS AND ADDENDUMS
E-1 General
E-2 Troubleshooting
E-2-1 Localizing the problem
E-2-2 Component Replacement
E-3 Circuit Description
E-4 Analog-to-Digital Converter
E-4-1 Reference Voltage
E-4-2 LED Display
E-5 Ohms-to-DC Converter
E-5-1 Constant Current Source
E-5-2 Constant Current Circuit Operation
E-6 Failsafe Design
E-7 Ultra-Safe Power Supply Scheme
F-1 General
F-2 Required Test Equipment
F-3 Calibration Procedure
F-4 Battery Replacement Instructions
620-400 620A Ohmmeter (Revision D) Parts/Assembly list
Diagram 620A-600 620A Main PCB Assembly - (Reference Designator Map)
Diagram 620-601-2 Display PCB Assembly
Diagram 620-070 Main PCB Electrical Schematics
(Revision D) 620-070 (DVM1) and 620-070 Current (I source) Source
APPENDIX
SECTION A
SECTION B
SECTION C