HP 54710A User's Reference Manual page 308

Utility Menu
System Configuration
Plug-in
The information within the box titled "Plug-in" is the configuration of the
plug-ins.
Slot Indicates the slot that the plug-in is installed in.
Model Indicates the model number of the plug-in. If there is no plug-in
in a slot, the model number is listed as empty. If the mainframe cannot
recognize a plug-in, "~known" is displayed in place of a model number. If
"~known" is displayed, try reinstalling the plug-in. If "~known is still
displayed, refer to the Service Guide for that plug-in because it indicates
that the plug-in is defective.
Serial number Indicates the serial number of the plug-in that is stored
in the nonvolatile memory inside of the plug-in.
Analog BW Indicates the maximum analog bandwidth of the plug-in
when used with the mainframe. Using probes and bandwidth limit filters
can result in a lower system bandwidth for the associated channel.
Calibration Memory Indicates the position of the memory protect
switch inside the plug-in. This switch is for the memory in the plug-in
that contains the calibration factors from the last plug-in calibration.
This switch is normally set to the protected position; before performing a
normal plug-in calibration, set the switch to the unprotected position.
Make sure that you return it to the protected position after completing
the calibration.
The memory protect switch inside of the plug-in does not affect the best
accuracy calibration. The memory protect switch for the best accuracy
calibration is on the rear panel of the mainframe, and it is normally set to the
unprotected position.
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