Null (Relative) Commands - Agilent Technologies 34420A User Manual

Chapter 4 Remote Interface Reference

Null (Relative) Commands

Null (Relative) Commands
The meter uses independant null values for channel 1 and channel 2
voltage measurements, resistance measurements, and temperature
measurements. See page 77 in Chapter 3.
[SENSe:] | SENSe1: | SENSe2
VOLTage[:DC]:NULL[:STATe] {OFF | ON}
VOLTage[:DC]:NULL[:STATe]?
VOLTage[:DC]:NULL:VALue {< value > | MIN | MAX}
VOLTage[:DC]:NULL:VALue?
These commands enable or disable the null state for voltage
measurements on the selected input channel. Null must be enabled
before the null value can be set. The null value set must be
within ±132 V on each input channel.
[SENSe:]
FRESistance | RESistance
:NULL[:STATe] {OFF | ON}
:NULL[:STATe]?
:NULL:VALue {< value > | MIN | MAX}
:NULL:VALue?
These commands enable or disable the null state for resistance
measurements. Null must be enabled before the null value can be set. The
null value set must be within ±1.2 M . Null is common to both 2-wire and
4-wire resistance measurements, that is, enabling null on 4-wire ohms
measurements also enables null on 2-wire ohms measurements.
[SENSe:]
TEMPerature
:NULL[:STATe] {OFF | ON}
:NULL[:STATe]?
:NULL:VALue {< value > | MIN | MAX}
:NULL:VALue?
These commands enable or disable the null state for temperature
measurements. Null must be enabled before the null value can be set.
The null value set must be in the range of -300° C to 2000° C. Null is
common to all temperature measurements, that is, enabling null for one
probe type enables null for all probe types.
[SENSe:]NULL {OFF | ON | ONCE}
This command enables or disables null for the active channel or function.
OFF or ON disables or enables null using a value set in the null register.
ONCE enables null and makes the next reading the null value.
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