Keysight 34972A - Autozero

Features and Functions 4
Keysight 34970A/34972A User’s Guide 135
Autozero
When autozero is enabled (default), the instrument internally disconnects the
input signal following each measurement, and takes a zero reading. It then
subtracts the zero reading from the preceding reading. This prevents offset
voltages present on the instrument’s input circuitry from affecting measurement
accuracy.
When autozero is disabled, the instrument takes one zero reading and subtracts it
from all subsequent measurements. It takes a new zero reading each time you
change the function, range, or integration time.
– Applies to temperature, DC voltage, 2-wire ohms, and DC current
measurements only. Autozero is enabled when you select 4-wire ohms
measurements.
– The autozero mode is set indirectly when you set the resolution and integration
time. Autozero is automatically turned off when you select an integration time
less than 1 PLC.
– You can set autozero from the remote interface only; you cannot directly set
autozero from the front panel.
– The autozero setting is stored in non-volatile memory, and does not change
when power has been off, after a Factory Reset (*RST command), or after an
Instrument Preset (SYSTem:PRESet command).
– Remote Interface Operation: The OFF and ONCE parameters have a similar
effect. Autozero OFF does not issue a new zero measurement. Autozero ONCE
issues an immediate zero measurement.
ZERO:AUTO {OFF|ONCE|ON}[,(@<ch_list>)]