64 U1253B User’s and Service Guide
3 Functions and Features
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. is
displayed.
2 Press to view the stored reference value.
and the stored reference value are displayed for 3
seconds.
3 To exit this mode:
• press within the 3 seconds when and
the stored reference value is displayed, or
• press for more than 1 second.
Null can be set for both auto and manual range settings, but not in the
case of an overload.
• In resistance measurement mode, the multimeter will read a non-zero
value even when the two test leads are in direct contact, because of
the resistance of these leads. Use the Null function to zero-adjust the
display.
• In DC voltage measurement mode, thermal effects will influence the
accuracy. Short the test leads and press once the displayed value
is stable to zero-adjust the display.
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