E-6
Failsafe Design
E-7
Ultra-Safe Power Supply Scheme
Figure E-1.
Model 620VN 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
SECTION F: ROUTINE MAINTENANCE
F-1
General
F-2
Required Test Equipment
F-3
Calibration Procedure
SECTION G: SCHEMATICS AND DIAGRAMS
Drawing 620VN -070 620RMS Main PCB Electrical Schematics
(Rev E Main PCB) 620RMS-070 DVM1 - 1of 2
and 620VL-070 Current (I source - 2 of 2) Source}
620VN Main PCB Bill Of Materials (components parts list) page 1 of 2
620VN Main PCB Bill Of Materials (components parts list) page 2 of 2
Drawing 620VN-600 620VN Main PCB Assembly (
Silkscreen Ref. Design Dwg.
) rev. J
Drawing 620VN-RS232 620VN Rear Panel Diagram
Drawing RS232C Controller PCB Schematic ( page 1 of 3 pages)
Drawing RS232C Controller PCB Schematic ( page 2 of 3 pages)
Drawing RS232C Controller PCB Schematic ( page 3 of 3 pages)
620VN (sample) Quality Inspection Test Report
R109
10K
IC101
5
6
+
-
R105
18.2K
R107
10K
RV102
1K OHM
POT
R108
10K
page 3
