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 620LM 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
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
620LM Main PCB Silkscreen - Reference Designator Map
Drawing 620-070 620LM Main Board Electrical Schematic
(Revision D) (620-070 DVM1 and 640-070 Current (I source) Source
Drawing 620-601-2 620LM Display Board Assembly
Drawing 620-075 620LM Cable Drawing - (Test Leads and Battery Charger)
Drawing 620-077 620LM Relay Board Schematic
CHAPTER I: UPDATES, MODIFICATIONS AND ADDENDUMS
