Dac Reference Adjustment - HP 54501A Service Manual

4-13 . DAC Reference Adjustment
Equipment Required :
Digital Multimeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3478A
Procedure :
1 .
Invoke SERVICE MENU by first pressing front-panel UTIL key and then selecting service
menu.
2.
Select cal select 2 with menu softkey .
3 .
Set dac output to high adjust .
4 .
Connect DVM to rear panel DC Calibrator Output .
HP 54501A ADJUSTMENTS
5 .
Adjust System Board Assembly R723 for DVM indication of 5 .0000 V . Refer to figure 4-4 for
adjustment location .
6 .
Set cal select to low view .
7. Measure V1 to four decimal places, 0 .
volts .
8.
Set dac output to high adjust .
9.
Adjust System Board Assembly R723 for DVM indication of 5.000V PLUS V1 from step 7 .
10.
Select exit menu softkey and oscilloscope will return to Utility menu .