[SENSe:]CURRent[:DC]:ZERO:AUTO {OFF|ON|ONCE}
[SENSe:]CURRent[:DC]:ZERO:AUTO?
Disables or enables the autozero mode for DC current measurements.
On the 34461A, use the [SENSe:]CURRent:{AC|DC}:TERMinals command to specify which current
terminals to use for the measurement.
Parameter Typical Return
{OFF|ON|ONCE}, default ON 0(OFF)or1(ON)
Configure DC current measurements and perform an immediate autozero. Make and read two measurements:
CONF:CURR:DC 1
CURR:DC:ZERO:AUTO ONCE
SAMP:COUN 2
READ?
Typical Response: +1.04530000E-01,+1.04570000E-01
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.
l The autozero mode is set indirectly when you set the resolution and integration time with CONFigure:CURRent:DC
or MEASure:CURRent:DC?. 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 197
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