VXI VT1422A - Manual (Page 401)

VT1422A Command Reference 399 Chapter 7
IEEE-488.2 Common Command Reference
IEEE-488.2 Common Command Reference
*CAL?
*CAL? Calibration command. The calibration command causes the Channel
Calibration function to be performed for every module channel. The Channel
Calibration function includes calibration of A/D Offset and Gain and Offset for all
64 channels. This calibration is accomplished using internal calibration references.
The *CAL? command causes the module to calibrate A/D offset and gain and all
channel offsets. This may take many minutes to complete. The actual time it will take
the VT1422A to complete *CAL? depends on the mix of SCPs installed.
*CAL performs literally hundreds of measurements of the internal calibration sources
for each channel and must allow seventeen time constants of settling wait each time
a filtered channel's calibrations source value is changed. The *CAL procedure is
internally very sophisticated and results in an extremely well calibrated module.
To perform Channel Calibration on multiple VT1422As, use
CAL:SETup/CAL:SETup?.
Note that the scope of the *CAL? and CAL:SETup commands is limited to the
VT1422A and the SCPs it contains. They do not calibrate Remote Signal
Conditioning Units like the VT1529A/B. CAL:REMote? must be used in addition to
*CAL?/CAL:SETup for RSC units.
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Returned Value:
The data type for this returned value is int16.
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When Accepted: Not while INITiated
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Related Commands: CALibration:SETup, CALibration:SETup?,
CALibration:STORe ADC
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CAL:STOR ADC stores the calibration constants for *CAL? and CAL:SETup
into non-volatile memory.
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Executing this command does not alter the module's programmed state
(function, range, etc.). It does however clear STAT:QUES:COND? register bit 13.
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Send with VXIplug&play Function: hpe1422_cmdInt16_Q(...)
Value Meaning Further Action
0 Cal OK None
-1 Cal Error Query the Error Queue (SYST:ERR?)
See “Error Messages” on page 453.