Agilent Technologies E4416A Service Manual page 75

2 Performance Tests
• Adjust the front panel Coarse Zero control to obtain a zero meter
indication.
11 Zero the Agilent 432A test power meter:
• Fine zero the Agilent 432A on the most sensitive range.
• Set the RANGE switch to 1 mW.
12 Set the DVM to measure microvolts.
13 Connect the positive and negative input leads to the Vcomp and VRF
connectors respectively, on the rear panel of the Agilent 432A.
14 Observe the reading on the DVM:
If less than 400 μV, go to step 15. If 400 μV or more, press and hold the
Agilent 432A Fine Zero switch and adjust the Coarse Zero control so that
the DVM indicates 200 μV or less. Release the Fine Zero switch and go to
step 15.
15 Round off the DVM value to two decimal places. Record this value as V
• V
16 Turn the power reference on:
Press
17 Round off the DVM reading to two decimal places. Record this value as V1:
• V
18 Turn the power reference off:
Press
19 Disconnect the DVM negative input lead from the VRF connector on the
Agilent 432A. Reconnect it to the Agilent 432A chassis ground.
20 Observe the reading on the DVM. Record this value as Vcomp
• V
21 Calculate the power measured from the power reference oscillator using
equation 2- 9:
Equation 2-9:
P
1
54
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___________
o
Zero
,
Power Ref On
Cal
___________
1
Zero
,
Power Ref Off
Cal
___________
comp
⋅ ( )
2 V V – V +
comp 1 0
= --------------------------------------------------------------------------
⋅
4 R
1
2 2
V – V
0 1
E4416A/E4417A Power Meters Service Guide
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