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SCPI Commands for the Digital Multimeter
3–218
VX4101A MultiPaq Instrument User Manual
The CALibrate:VALue command is used to perform the calibration. The set of
modes and ranges that must be calibrated are as follows:
DC (10 GW input impedance), 0.030, 0.300, 3.00 V ranges
DC (10 MW input impedance, all ranges)
AC/DC, all ranges
4-wire W, all ranges
2-wire W, 30 W range at null only
Current, all ranges
The AC mode uses the AC/DC calibration information and is not calibrated
separately.
The higher 2-wire W ranges depend on the 4-wire W gain calibration and the
30 W 2-wire null calibration, and are not calibrated separately. If a CALibra-
tion:VALue command is issued in the AC mode or higher 2-wire resistance
ranges, an “Invalid DMM Calibration Mode” error is generated.
All calibrated modes and ranges except the 2-wire 30 W range require both a null
and a gain calibration. The 2 wire 30 W range requires only a null calibration.
The null calibration must be performed prior to the gain calibration. The limits
of <Calibration Value Input> depend on the mode and range. For the DC,
resistance, and current mode null calibrations, the argument must be exactly 0.
The <Calibration Input Value> is the external calibration voltage, resistance or
current applied. Appendix E provides a set of external calibration specification
requirements, environmental requirements, and warm-up requirements necessary
for a valid calibration.
The DMM must be programmed for the desired mode/range prior to the
calibration. Use a CONFigure command with the expected value equal to the
range value, followed by an INITiate:[IMMediate] command or a READ? query.
CAUTION. Do not send only the CONFigure command followed by a CALIbra-
tion:VALue command. You must include an INITiate or READ? command to
place the DMM in the proper mode and range. You must allow sufficient time for
both the calibration source to stabilize and the VX4101A to stabilize physically
in the desired mode and range prior to performing the calibration.
For the AC/DC “null” calibration and the gain calibration for all calibrated
modes and ranges, the <Calibration Input Value> must be a positive value within
the limit listed below. The limits shown are as a percentage of the full scale
range value. For example, in the DC 30 V ranges, where the gain percentage
must be between 65% and 100%, the CALibration:VALue argument must be
between 19.5 and 30.0. A value outside of these limits will result in an “Invalid
DMM Calibration Input” error.