User`s guide

Remarks
This command affects both 2-wire and 4-wire resistance measurements. All
FRES and RES commands affect the equivalent settings for all resistance
measurements.
To use the null value, you will also need to turn on the null state with the
[SENSe:]FRESistance:NULL[:STATe] command.
When using this command, it is recommended that you not turn on the
separate null state with the CALCulate:FUNCtion command. If you do, the
individual ("per function") null value set with this command, and the global
null value set with the CALCulate:NULL:OFFSet command will be additive.
A Factory Reset (*RST command) or an Instrument Preset
(SYSTem:PRESet command) clears all null values.