HP 54710A User's Reference Manual page 314

Normal indicates that the plug-in is not calibrated for best accuracy. Either
the best accuracy calibration factors were cleared from the memory in the
mainframe, or that a best accuracy calibration has not yet been performed on
this plug-in in this slot. But calibrated does indicate that the normal plug-in
calibration is still valid for this plug-in which gives you typically a 3 percent
vertical accuracy characteristic. All you have to do to gain back the 1 percent
best accuracy specifications is perform a best accuracy calibration again.
To perform a best accuracy calibration
1 Press the Channel key on the plug-in.
2 Press the Calibrate...softkey.
3 Press the Calibrate to best accuracy softkey.
4 Follow the instructions on the display.
Uncalibrated indicates that the calibration factors in the plug-in are set to the
default state. See the Service Guide that is supplied with the plug-in for
calibration information.
Best accuracy ∆Temp Indicates the temperature change from the
temperature that the last best accuracy calibration was performed at.
Output
Output lets you select the output signal for the front-panel CAL signal on the
mainframe. The output choices are dc, 2-kHz square wave and 500 kHz
square wave. The CAL signal is used for mainframe calibration, plug-in
calibration, probe calibration, best accuracy calibration, skew calibration, and
as a demonstration signal.
•
The dc output is setable from −2.5 Vdc to +2.5 Vdc into 50 Ω.
•
The 2-kHz and 500-kHz square waves are 1 Vp-p into 50 Ω with about
1.6-ns edges.
Utility Menu
Calibrate
19–13