Digital Multimeter Operation 2
Math Operations
U3606A User’s and Service Guide 57
Null
When making null measurements, also called relative, each reading is the
difference between a stored (selected or measured) null value and the
input signal. One possible application is to increase the accuracy of a
2- wire resistance measurement by nulling the test lead resistance. Nulling
the leads is also particularly important prior to making capacitance
measurements. The formula used for calculating null measurements is:
The null value is adjustable, you can set it to any value between 0 and
±120% of the highest range, for the present function.
Enabling the null operation
For any measurement function, you can directly measure and store the
null value by pressing Null with the test leads open (nulls the test lead
capacitance), shorted (nulls the test lead resistance), or across a desired
null value circuit.
The Null annunciator is illuminated and the null operation is enabled.
Press Shift > Exit to exit the null mode.
Result reading null value–=
Null can be set for both auto and manual range settings, but not in the
case of an overload.
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