Access To The Hp 8 1 1 2A For Adjustments; Test Equipment - HP 8112A Operating, Programming And Servicing Manual

Test Equipment

Test Preparati
Power Supplies
Equipment
Procedure
9-4 Adjustment Procedures
Refer to Chapter 1
and accessories.
Refer to Chapter 10.1
pn
,
open up the HP 81 12A instrument and prepare for servicing>
Control Board
�
Figure 9-1. Access to the HP 8 1 1 2A for Adjustments
Digital Voltmeter (HP 3456A)
1 . Connect the DVM low terminal to the ground testpoint on board
A l .
2. Test the supply voltages and, i f necessary, make adjustments to
achieve the levels given here:
3. Disconnect the DVM.
for the recommended test equipment
Introduction
Troubleshooting
M i c r o p rocessor B oar d
0
0
Testpoint Adjust
Al+l5 V A1R24 +15.000 V ±15 mV
Al-5.4 V A1R12 -5.40 V ±10 mV
A1+5.0 V +5.050 V ±50 m V
-
A3+5.0 V
+5. 150 V ±50 mV
-
A 1+23 V A1R18 +23 .000 V ±50 mV
Al -23 V A1R19 -23.000 V ±50 m V
A l - 1 5 V A1R25 - 1 5.000 V ±15 mV
for instructions on how to
0
0
Result