User`s guide

Multimeter Features 3
Making Relative Measurements (Null)
U1231A/U1232A/U1233A User’s Guide 69
Figure 3-3 Null operation
NOTE
• In resistance measurement, 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.
• For DC voltage measurements, the thermal effect will influence the
accuracy of the measurements. Short the test leads and press
when the displayed value is stable to zero-adjust the display.
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Display returns to
normal after 3 seconds
disable the Null function
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Pr ess aga i n t o
the Null function
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Press to enable
stored null value
Press to view the