DRAFT
33
Operation and Service Manual
Adjustment Procedure
Adjustment Procedure
Power Supply Voltage Check and Adjustment
Description:
To insure that the amplifier gives proper gain, the power supply is adjusted to 20V
±
0.1V.
Equipment:
Digital voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3440A/3444A
RMS voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3400A
Cable assembly (w/test clips). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10501A
Adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10111A
Figure 10
Power Supply Voltage Adjustment Test Setup
Procedure:
1
Connect the test setup in Figure 10. Set the digital voltmeter to measure
+
20V dc.
2
Adjust A1R9 VOLT ADJ for a digital voltmeter reading of
+
20V
±
0.1V dc.
3
Remove the digital voltmeter from the amplifier and connect the RMS voltmeter to
XA1 pin 14. The ripple voltage should be as shown below.
DVM:
+
19.9V dc
_________________
+
20.1V dc
