Adjustments
3
E4416A/E4417A Power Meters Service Guide
69
9
Round off the DVM reading to the nearest microvolt and record this value as
V
0
.
•
V
0
________________ V
•
Disconnect the DVM negative input lead from the V
RF
connector on the
test power meter and reconnect it to chassis ground.
10
Turn the power reference on:
•
Press
,
11
Record the reading on the DVM to two decimal places. This is V
comp
.
•
V
comp
_____________V
12
Reconnect the negative lead to the VRF connector on the rear panel of the
Agilent 432A. The DVM is now set up to measure V
1
which represents the
power reference oscillator output level.
13
Calculate the required value of V
1
using equation 2.
14
Remove the power meter's cover and adjust A2R90 until the DVM indicates
the calculated value of V
1
. Refer to
Figure 3- 4
for the position of A2R90:
Zero
Cal
Power Ref On
V
1
V
comp
V
0
V
comp
2
10
( )
3
–
4
R
(
)
CalibrationFactor
(
)
–
–
+
=
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