Performance Tests 2
E4416A/E4417A Power Meters Service Guide 39
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 Figure 2- 6, ensuring that the DVM
input leads are isolated from chassis ground.
4 Preset the power meter:
Press , then on the power meter.
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
comp
and V
RF
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
0
.
• V
0
___________
10 Turn the power reference on:
Press
, .
Ensure that the Agilent 432A and the power meter under test have been powered on for
at least 30 minutes before moving to step 4.
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