Features and Functions 3
Agilent U1251A/U1252A User’s and Service Guide 63
NULL (Relative)
The NULL function subtracts a stored value from the present
measurement and displays the difference between the two.
1 Push 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 Push to see the stored reference value. NULL
flashes for 3 seconds before the display returns to zero.
3 To exit this mode, push while NULL is flashing on
the display.
NOTE
Null can be set for both auto and manual range setting, but not in the
occurrence of an overload.
NOTE
• When in resistance measurement, the meter reads a non-zero value
due to the presence of test leads. Use the Null function to zero-adjust
the display.
• When in DC voltage measurement, the thermal effect will influence the
accuracy. Short the test leads and push NULL once the displayed value
is stable in order to zero out the display.
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