A2R90 Adjustment Location - HP E4418A Service Manual

Adjustments
Power Reference Oscillator Level Adjustment
10. Turn the power reference on by pressing
Zero
,
Power Ref Off On
Cal
Zero
,
Cal
Cal
HP EPM-442A.
11. Record the reading on the DVM to two decimal places. This is
V .
comp
V _____________V
comp
12. Reconnect the negative lead to the V
of the HP 432A. The DVM is now set up to measure V
represents the power reference oscillator output level.
13. Calculate the required value of V
V = V
1 comp
14. Remove the power meter's cover and adjust A2R90 until the DVM
indicates the calculated value of V
position of A2R90.
Figure 3-4: A2R90 Adjustment Location
3-10
on the HP EPM-441A.
, ,
More Power Ref Off On
using equation 2.
1
2
(
+ V V 10
– –
0 comp
1
A2R90
BT1
A2 Assembly
J12
A2J13
Front Panel
HP EPM-441A/442A Service Guide
on the
connector on the rear panel
RF
which
1
3
–
) ( ) CalibrationFactor (
4R
. Refer to Figure 3-4 for the
A2L9
)