How To Use The Power Control Feature - Agilent Technologies 8163A Manual

Setting Attenuation and/or Power Levels
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How to Use the Power Control Feature

81576A/77A Attenuator modules incorporate Power Control functionality that
automatically corrects for power changes at its input to maintain your desired
output power.
This feature is designed to compensate, for example, for output power drift by the
source.
When Power Control is On:
• If P deviates by more than 0.1 dB from your desired P
actual
Attenuator module automatically restores P
transition speed of 12 dB/s.
• Input power is measured using your set Averaging Time.
• To avoid 'hunting', and consequent wear on the filter motor mechanism in
response to an unstable source, for differences between P
greater than 0.01 dB, but less than 0.1 dB, P
30 s.
• The Attenuator module does not respond to a power difference of 0.01dB or
less. Such a change is regarded as noise.
• If the attenuation is driven beyond 0 dB, Exp ("Excessive Power") is displayed.
There is now insufficient input power for the Attenuator to maintain your
desired P .
SET
Power Control On/Off
To enable or disable Power Control, select the [Pwr Ctrl] parameter.
When Power Control is On the Attenuator's status display includes 'PC'.
The Menu item <Pwr Control> is functionally equivalent to the
[Pwr Control] parameter.
How to Use a Variable Optical Attenuator module
SET
SET
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth Edition
value, the
SET
at the maximum possible filter
and P
SET actual
is updated approximately every