Agilent Technologies 34970A, User Manual, Page: 122 / 356

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Chapter 4 Features and Functions
General Measurement Configuration
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 >)]
34970A Refresh UG.book Page 122 Wednesday, February 17, 2010 12:34 PM