[SENSe:]VOLTage[:DC]:ZERO:AUTO {OFF|ON|ONCE}
[SENSe:]VOLTage[:DC]:ZERO:AUTO?
Disables or enables the autozero mode for DC voltage and ratio measurements.
l ON (default): the DMM internally measures the offset following each measurement. It then subtracts that
measurement from the preceding reading. This prevents offset voltages present on the DMM’s input circuitry from
affecting measurement accuracy.
l OFF: the instrument uses the last measured zero measurement and subtracts it from each measurement. It
takes a new zero measurement each time you change the function, range or integration time.
l ONCE: the instrument takes one zero measurement and sets autozero OFF. The zero measurement taken is used
for all subsequent measurements until the next change to the function, range or integration time. If the specified
integration time is less than 1 PLC, the zero measurement is taken at 1 PLC to optimize noise rejection.
Subsequent measurements are taken at the specified fast (< 1 PLC) integration time.
Parameter Typical Return
{OFF|ON|ONCE} 0(OFF)or1(ON)
Configure DC voltage measurements and immediately autozero. Make and read two measurements:
CONF:VOLT:DC 1
VOLT:DC:ZERO:AUTO ONCE
SAMP:COUN 2
READ?
Typical Response: +1.04530000E+01,+1.04570000E+01
l The autozero mode is set indirectly when you set the resolution and integration time using
CONFigure:VOLTage:DC, CONFigure:VOLTage:DC:RATio, MEASure:VOLTage:DC?, or
MEASure:VOLTage:DC:RATio?. Autozero is automatically turned OFF when you select an integration time less
than 1 PLC with these commands.
l This parameter is set to its default value after a Factory Reset (*RST) or Instrument Preset (SYSTem:PRESet).
Agilent Truevolt Series DMM Operating and Service Guide 223
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