Functions and Features 3
Keysight U1251B and U1252B User’s and Service Guide 83
Null (Relative)
The Null function subtracts a stored value from the present measurement and
displays the difference between the two.
1 Press to store the displayed reading as the reference value to be
subtracted from subsequent measurements and to set the display to zero.
NULL is displayed.
2 Press to see the stored reference value. NULL flashes for 3 seconds
before the display returns to zero.
3 To exit this mode, press while NULL is flashing on the display.
NOTE
– Null can be set for both auto and manual range settings, but not in the event
of an overload.
– When taking a resistance measurement and the meter reads a non-zero
value due to the presence of test leads, use the Null function to adjust the
display to zero.
– When taking a DC voltage measurement, the thermal effect will influence the
accuracy. Short the test leads and press Null once the displayed value is
stable in order to zero out the display.
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