Adjustments
Power Reference Oscillator Level Adjustment
HP EPM-441A/442A Service Guide 3-9
8. Observe the reading on the DVM. If less than 400 µV, pr o c e e d w i t h
the next step. If 400
µV or greater, press and hold the HP 432A
fine zero switch and adjust the coarse zero control so that the
DVM indicates 200
µV or less. Then release the fine zero switch
and proceed to the next step.
9. Round off the DVM reading to the nearest microvolt and record
this value as V
0
.
■ V
0
________________µV
■ Disconnect the DVM negative input lead from the V
RF
connector on the test power meter and reconnect it to chassis
ground.
4402serv.book Page 9 Monday, March 11, 2002 11:34 AM
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