Features and Functions 3
Keysight 34420A User’s Guide 91
– Front-panel operation: After enabling null, you can edit the stored null value
by pressing
(Menu Recall). Any previously stored value is replaced
with the new value. Turning on the menu does not disable the null operation;
the meter will resume taking measurements when you turn off the menu.
When null is enabled, the ‘Null’ annunciator lights in the display. For ratio or
difference measurement, if either input channel has a null enabled, the Null
annunciator will flash. If you apply the difference null, the Null annunciator will
light (not flash).
– Remote interface operation: You can use the following commands to make
null measurements. Null must be enabled before you can store a value in the
Null Register.
SENSe1 | SENSe2
:VOLTage:DC
:NULL {OFF|ON}
:NULL {<value>|MIN|MAX}
[SENSe:]
FRESistance|RESistance
:NULL {OFF|ON}
:NULL {<value>|MIN|MAX}
TEMPerature
:NULL {OFF|ON}
:NULL {<value>|MIN|MAX}
To enable null and set a null value (0.10) for the 2-wire resistance function
execute the following commands in the order shown.
SENS:RES:NULL ON
SENS:RES:NULL 0.10
You can use the first reading as a null value from the remote interface by first
setting the function, range, and resolution and then executing the following
command:
[SENSe:]NULL [{OFF|ON|ONCE}]
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