HP 8508A - Power Supply Adjustments

Adjustments
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5-8 POWER SUPPLY ADJUSTMENTS: +12.0V, -12.0V and +5.0V.
DESCRIPTION
The +12.0V, -12.0V, and + 5.0V power supplies are adjusted under load for the proper voltage levels with an Input
Module installed.
EQUIPMENT
Instrument Recommended Model
Input Module _ HP 85081A or HP 85082A
Digital Voltmeter (DVM) HP 3456A
PROCEDURE:
1. Install an Input Module in the HP 8508A mainframe.
2. Switch on the equipment and allow to warm up for 30 minutes.
NOTE: If an Error Code in the 200 Series is displayed, the power supply voltages should be tested with a
DVM. If the supply voltages are correct, the fault may be on the Search and Lock Asssembly (A4).
3. Remove the HP 8508A top cover to allow access to the adjustments. |
4. Connect the DVM input to the Test Points shown in the following table and make the appropriate adjustments
for the correct voltage levels.
Test Point Adjustment Voltage Tolerance
A2TP3 A2R16 +12.0V +0.1V
A2TP4 A2R19 -12.0V +0.1V
A2TP2 AR + 5.0V +0.05V
A2TP1 GND
4 E1089
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