Keysight Technologies 8163A, User Manual

Page: 228 / 466

8163A/B, 8164A/B, 8166A/B User’s Guide 227
Setting Attenuation and/or Power Levels 8
• To zero all the powermeters hosted by the same mainframe as the
Attenuator module (including the Attenuator module and, for example,
the powermeter incorporated in a return loss module), press [Menu] ,
then select < Zero All >.
• To set the measurement Averaging Time used by the powermeter
incorporated in the Attenuator module, press [Menu] , select
< Averaging Time >, press [OK], select your preferred Averaging Time,
press [OK], then press [Close].
• As with any powermeter, a longer Averaging Time increases accuracy
and noise rejection, but increases response time.
Calibration Procedure
The power level measured by the integrated powermeter at the output of
the module is displayed as P
actual
. To calibrate your test setup, you apply a
P
Offset
to calibrate for the patchcord and connector losses that occur
between the Attenuator module output and the DUT input.
After calibration, you edit the Attenuator’s P
SET
parameter to control the
absolute power applied to the DUT.
1 Disconnect the DUT input in your test setup and connect it to your
reference powermeter.
• Set the
λ
parameter for the reference powermeter to the source
wavelength or, for a multi-wavelength DWDM signal, the effective
wavelength
λ
effective
Refer to Multi-wavelength DWDM signals on page 224.
• Set an appropriate measurement < Averaging Time> .
2 Display the details screen for the Attenuator module.
• Make sure the
λ
parameter set for the Attenuator module matches
the source wavelength or, for a multi-wavelength DWDM signal,
λ
effective
.
• Make sure that the Averaging Time set for the integrated
powermeter matches that set for the reference powermeter.
3 If the reference powermeter is hosted by the same mainframe as the
Attenuator module:
• Select the P
Offset
field,
• Press the [PM-> Off ] softkey,
• Select the channel used to host your reference powermeter,
• Press [OK].