2 Front-Panel Operation
56 Keysight 34420A User’s Guide
To Make Null (Relative) Measurements
Each null measurement, also called relative, is the difference between a stored
null value and the input signal. See page 90.
Read ing = measurement – null value
– You can make null measurements on any function or channel. You can set a
null for each channel and function independently. The meter remembers the
null value when you switch between input channels or functions.
– To null the test lead resistance for more accurate two-wire ohms
measurements, short the ends of the test leads together and then press .
– The first reading taken after you press is stored as the null value in the
Null Register. Any previously stored value is replaced with the new value.
– After enabling null, you can edit the stored null value by pressing
(Menu Recall). This takes you to the “NULL VALUE” command in the MATH
MENU (only if null is enabled). Go down to the “parameter” level, and then edit
the displayed value.
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