Null (Relative)
(continued)
•The null value is stored in the multimeter’s Null Register. Ther e a re
two ways you can specify the null value. First, you can enter a
specific number into the register from the front-pan el men u or fr om
the remote interface. Any previously stored value is replaced with the
new value. If you are operating the multimeter from the front panel,
entering a null value also turns on the null function.
The second way to enter the null value is to let the multimeter store
the first reading in the register. After you ena ble null, the firs t
reading displayed will be zero (if you have not changed the value
stored in the register). If you entered a number into the register, as
described in the paragraph above, the first reading does not overwrite
the stored value.
•Front-Panel Operation: After enabling null, you can edit the sto red
null value by pressing Shift > (Menu Recall). Any previously
stored value is replaced with the new value. Turning on the menu
does not disable the null operation; the multimeter will resume
taking measurements when you turn off the menu.
2: NULL VALUE (MATH MENU)
See also “To Make Null (Relative) Measurements,” on page 38.
•Remote Interface Operation: You can use the following com mands to
make null measurements. Math must be enabled before you can store
a value in the Null Register.
CALCulate:FUNCtion NULL
CALCulate:STATe {OFF|ON}
CALCulate:NULL:OFFSet {<value>|MINimum|MAXimum}
The following program segment shows the proper order that you
should execute the commands to enable null and set an offset value.
CALC:FUNC NULL
CALC:STAT ON
CALC:NULL:OFFS -2.0
Chapter 3 Features and Functions
Math Operations
66