Agilent Technologies 8163A Manual page 210

Setting Attenuation and/or Power Levels
210
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• 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
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
power applied to the DUT.
1 Disconnect the DUT input in your test setup and connect it to your reference
powermeter.
λ
• Set the parameter for the reference powermeter to the source wavelength
or, for a multi-wavelength DWDM signal, the effective wavelength
Refer to "Multi-wavelength DWDM signals" on page 207.
• Set an appropriate measurement <Averaging Time>.
2 Display the details screen for the Attenuator module.
• Make sure the
source wavelength or, for a multi-wavelength DWDM signal,
• 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
• 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
by the Attenuator module as P
4 If the reference powermeter is hosted by another mainframe:
• Manually enter the value of P
• P = P - P
Off actual
• where P is the power level measured by your reference powermeter.
ref
5 Disconnect the input to the reference powermeter, then connect it to the DUT
input.
How to Use a Variable Optical Attenuator module
. To calibrate your test setup, you apply a P
actual
parameter to control the absolute
SET
λ
parameter set for the Attenuator module matches the
field,
, then applied to P
Offset
Off
ref
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth Edition
to
Offset
λ
effective
λ
.
effective
is stored
actual
and P .
SET actual