HP 54710A User's Reference Manual page 312

Utility Menu
Calibrate
Figure 19-3
Calibration Memory This is the status of the Frame cal switch on the
rear panel. This switch is normally set to the protected position; before
performing a mainframe calibration, set the switch to the unprotected
position. Make sure you return it to the protected position after
completing the calibration.
Frame Calibration Status Indicates the calibration status of the
mainframe, which is either calibrated or uncalibrated. Below the Frame
Calibration Status line is a display of each slot and whether the slot
passed or failed the calibration. If any part of the calibration process
fails, then the Frame Calibration Status line also displays failed.
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