• Front-panel operation: After enabling null, you can edit the stored
null value by pressing
Shift > (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}]
Chapter 3 Features and Functions
Null (Relative) Operation
78
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