Setting Attenuation and/or Power Levels How to Use a Variable Optical Attenuator module
194 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
– Press the [PM-> Off ] softkey,
– Select the channel used to host your reference powermeter,
– Press [OK].
The difference between the power level measured by your reference
powermeter and the power value measured by your Attenuator
P
actual
is stored by the Attenuator module as P
Offset
, then applied to
P
SET
and P
actual
.
4 If the reference powermeter is hosted by another mainframe:
– Manually enter the value of P
Off
P
Off
= P
actual
- P
ref
where P
ref
is the power level measured by your reference
powermeter.
5 Disconnect the input to the reference powermeter, then connect it
to the DUT input.
6 Edit the P
SET
parameter to control the absolute power applied to
the DUT. The attenuation, α , displayed is updated to reflect the new
P
SET
value.
Figure 122 81566A/67A/76A/77A Setting P
SET
after calibration using [PM->Off]
Figure 122 shows an absolute power P
SET
of -10 dBm applied to a
DUT. Here:
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