CAL:

This area lists the status of calibration. The possible calibration states are:

OK: The calibration data is current.

Needed: The hardware has not been calibrated or the calibration data is out of date.

Warmup: The temperature of the measurement hardware is changing. (This probably means the hardware was recently turned on.) When the temperature stabilizes, this state will change to either OK or Needed.

None: The current hardware configuration does not support calibration (for example, simulated hardware or ADS interface).