17-28 SCPI Command Reference Models 2500 and 2502 User’s Manual
Set or acquire relative value
OFFSet <n>
:CALCulate3:NULL:OFFSet <NRf> Specify null offset (REL) for channel 1
:CALCulate4:NULL:OFFSet <NRf> Specify null offset (REL) for channel 2
Parameters <NRf> = -9.999999e20 to Specify null offset value
9.999999e20
Query :OFFSet? Query null offset value
Description This command lets you establish a null offset (REL) value for channel 1
(CALC3) or channel 2 (CALC4). When Null Offset is enabled, the
result is the algebraic difference between the feed reading (see
FEED <name> above) and the offset value:
CALC3 or CALC4 reading = feed reading - null offset
ACQuire
:CALCulate3:NULL:ACQuire Acquire channel 1 REL value
:CALCulate4:NULL:ACQuire Acquire channel 2 REL value
Description These commands automatically acquire the null offset values for chan-
nel 1 (CALC3) and channel 2 (CALC4). The next available reading will
become the offset value.
Enable and read relative result
STATe <b>
:CALCulate3:NULL:STATe <b> Control channel 1 REL
:CALCulate4:NULL:STATe <b> Control channel 2 REL
Parameters <b> = 1 or ON Enable REL
0 or OFF Disable REL
Query :STATe? Query state of REL
Description These commands are used to enable or disable the null or offset value
for REL. When enabled, the CALC3 or CALC4 reading will include the
null offset value (see OFFSet <n>). When disabled, the CALC3 or
CALC4 reading will not include the null offset.
DATA?
:CALCulate3:DATA? Read channel 1 REL result
:CALCulate4:DATA? Read channel 2 REL result
Description These query commands are used to read the CALC3 or CALC4 REL
result. When CALC3 or CALC4 is enabled (see STATe <b>), the
returned value will include the offset value (see OFFSet <n> and
ACQuire).
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