Specifications

Common Command Reference

The following reference discusses the VT1419A IEEE-488.2 Common commands.

*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 VT1419A

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 VT1419As, use CAL:SETup.

Returned Value:

Value Meaning Further Action

0 Cal OK None

-1 Cal Error Query the Error Queue (SYST:ERR?)

See Error Messages in Appendix B

The C-SCPI type for this returned value is int16.

When Accepted: Not while INITiated

Related Commands: CALibration:SETup, CALibration:SETup?,

CALibration:STORe ADC

CAL:STOR ADC stores the calibration constants for *CAL? and CAL:SETup

into non-volatile memory.

Executing this command does not alter the module’s programmed state (function,

range, etc.). It does however clear STAT:QUES:COND? register bit 13.

NOTE If Open Transducer Detect (OTD) is enabled when *CAL? is executed, the module

will disable OTD, wait 1 minute to allow channels to settle, perform the calibration,

and then re-enable OTD. If the program turns off OTD before executing *CAL?, it

should also wait 1 minute for settling.

VT1419A Command Reference

Common Command Reference

Chapter 6 311

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