Agilent Technologies E4416A Service Manual page 60

2 Round off the DVM reading to two decimal places and note this value as the
internal bridge resistance (R) of the Agilent 432A (approximately 200 Ω).
• R ____________ Ω
3 Connect the equipment as shown in
input leads are isolated from chassis ground.
Ensure that the Agilent 432A and the power meter under test have been powered on for
N O TE
at least 30 minutes before moving to step 4.
4 Preset the power meter:
Press
Set the Agilent 432A RANGE switch to Coarse Zero. Adjust the front panel
Coarse Zero control to obtain a zero meter indication.
5 Zero the Agilent 432A test power meter:
• Fine zero the Agilent 432A on the most sensitive range.
• Set the RANGE switch to 1 mW.
6 Set the DVM to measure microvolts.
7 Connect the positive and negative input leads to the V
connectors respectively, on the rear panel of the test power meter.
8 Observe the reading on the DVM. If less than 400 µV, proceed to the next
step. If 400 µV or greater, press and hold the test power meter Fine Zero
switch and adjust the Coarse Zero control so that the DVM indicates 200 µV
or less. Release the Fine Zero switch and proceed to the next step.
9 Round the DVM reading to two decimal places.
Record this reading as V
• V
10 Turn the power reference on:
Press
E4416A/E4417A Power Meters Service Guide
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Preset
, then Confirm on the power meter.
Local
.
0
___________
0
Zero
, .
Power Ref On
Cal
Performance Tests
Figure 2- 6, ensuring that the DVM
and V
comp
2
RF
39