[SENSe:]RESistance:ZERO:AUTO {OFF|ON|ONCE}
[SENSe:]RESistance:ZERO:AUTO?
Disables or enables the autozero mode for 2-wire resistance 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 2-wire resistance measurements and perform an immediate autozero. Make and read two measurements:
CONF:RES 1E4
RES:ZERO:AUTO ONCE
SAMP:COUN 2
READ?
Typical Response: +1.04530000E+03,+1.04570000E+03
l This command does not affect 4-wire resistance measurements, which are always made with autozero ON.
l The autozero mode is set indirectly when you set the resolution and integration time using CONFigure:
{RESistance|FRESistance} or MEASure:{RESistance|FRESistance}?. 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).
210 Agilent Truevolt Series DMM Operating and Service Guide
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