How to Use a Variable Optical Attenuator module Setting Attenuation and/or Power Levels
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 185
Power Units To select the units used to display power values:
1 Use the Cursor key to highlight a power parameter (P
set
or P
ref
),
then press the [Pwr Unit] softkey.
2 Select <W> or <dBm>.
3 Press [OK].
The menu item <Power Unit> is functionally equivalent to the [Pwr
Unit] softkey.
How to Control the Shutter
The optical path of the Attenuator module is controlled by a shutter,
which you can use both for protection purposes or to simulate channel
drops.
When the shutter is open, the green LED on the attenuator module’s
front panel is lit.
The Enable button Press the Enable button, located on the front panel of the Attenuator
module, to toggle the shutter state.
The On/Off Softkey Press the [On/Off] softkey to toggle the shutter state.
The menu item <Output State>, and the parameter [Output], is
functionally equivalent to the [On/Off] softkey.
Output at Startup To select the shutter state at startup:
1 Press the [Menu] softkey.
2 Use the Cursor key to highlight <Output at Startup>, then press
Enter.
3 Select <Off > or <On>.
4 Press [OK], then press [Close].
Remote Interlock The Attenuator module’s shutter state is protected by mainframe’s
Remote Interlock (RIL) feature. The shutter cannot be opened if the
50Ω resistor is removed from the RIL connector on the back panel of
the mainframe. See “The Remote Interlock (RIL) connector” on
page 291.
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