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

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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-volatilememory, 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 {OFFONCEON}[,(@<ch_list>)]

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