Amptec Research 620A 4R, Operation And Maintenance Manual

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CHAPTER E: GENERAL OPERATION AND DESIGN
E-1 General
E-2 Troubleshooting
E-3 Circuit Descriptions
E-4 Analog-to-Digital Converter
E-5 Ohms-to-DC Converter
E-6 Failsafe Design
E-7 Ultra-Safe Power Supply Scheme
Figure E-1. Model 620A 4R Block Diagram
Figure E-1B Analog-to-Digital Converter Timing Diagram
Figure E-2 Analog Section of IC1 and IC2
Figure E-3. Constant Current Source Diagram (Simplified)
Figure E-4. LED Display Pin Functions
E-8 Relay Board
CHAPTER F: ROUTINE MAINTENANCE
F-1 General
F-2 Required Test Equipment
F-3 Calibration Procedure
F-4 Battery Replacement Instructions
CHAPTER G: COMPONENT PARTS LISTS
620-400 Parts/Assembly list
CHAPTER H: SCHEMATICS AND DIAGRAMS
620A 4R Main PCB Silkscreen - Reference Designator Map
Drawing 620-070 620A 4R Main Board Electrical Schematic
(Revision D) (620-070 DVM1 and 620N-070 Current (I source) Source
Drawing 620-601-2 620A 4R Display Board Assembly
Drawing 620-075 620A 4R Cable Drawing - (Test Leads and Battery Charger)
Drawing 620-077 620A 4R Relay Board Schematic
Drawing 620-078 620A 4R Front Range Switch Schematic
CHAPTER I: UPDATES, MODIFICATIONS AND ADDENDUMS