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3
Multimeter Features
Making Relative Measurements (Null)
When making null measurements — also known as relative measurements — each reading
is the difference between a null value (stored or measured) and the input signal.
One possible application is to increase the accuracy of a resistance measurement by nulling
the test lead resistance. Nulling the leads is also particularly important prior to making
capacitance measurements.
Null can be set for both auto and manual range settings, but an overload reading cannot
NOTE
be stored as a null value.
1 To activate the relative mode, press the
that when Null (
Figure 3-2
2 Press
after a brief moment.
3 To disable the Null function, press
For any measurement function, you can directly measure and store the null value by
pressing
test lead resistance), or across a desired null value circuit.
100
) is enabled, is stored as the reference value.
Null display
Vsense
again to view the stored reference value. The display will return to normal
Vsense
with the test leads open (nulls the test lead capacitance), shorted (nulls the
Vsense
key. The measurement value at the time
Vsense
while the stored reference value is shown.
Keysight U1281A/U1282A User's Guide
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