Keysight Technologies 8163A User Manual page 227

8 Setting Attenuation and/or Power Levels
226
4 If the reference powermeter is hosted by another mainframe:
• Manually enter the value of P
value measured by your reference powermeter.
5 Disconnect the input to the reference powermeter, then connect it to
the DUT input.
6 Edit the P
The attenuation,
Your calibration is valid until there is some change to the power applied
NOTE
to the input of the Attenuator module. For example, if you change the
optical path to the Attenuator module, you must recalibrate.
For a multi-wavelength DWDM signal, your determined effective
wavelength l effective is valid until there is some change to the signal's
optical power vs wavelength spectrum.
Calibrating Test Setups that use an 81576A/77A Attenuator mod ule
Requirement for Calibration
81576A/77A Attenuator modules with Power Control incorporate a
powermeter that allows you to control the output power level of the
module. After calibration for the losses in the patchcords and connectors
between this output and the DUT input, you can set absolute power levels
at the DUT input.
Furthermore, when the Attenuator's Power Control feature is enabled, the
Attenuator module automatically corrects for power changes at its input to
maintain your desired output power.
Preconditions
• To make the calibration as quick and simple as possible, host your
reference powermeter in the same mainframe as the Attenuator
module, as described in
• Before taking a power measurement, make sure the source is warmed
up so that its power output is stable.
• It is good practice to zero the powermeters in your test setup . Refer to
Hosting a Reference Powermeter
• To zero the powermeter incorporated in the Attenuator module, press
[Menu] , then select <Zero>.
ref
parameter to set the power applied to the DUT.
SET
α
, displayed is updated to reflect the new P
Hosting a Reference Powermeter
such that P equals the power
SET
on page 217.
8163A/B, 8164A/B, 8166A/B User's Guide
value.
SET
on page 217.