Annex: Remote Control - Commands R&S NRP
1144.1400.12 Annex - I.2 E-2
Relative measurements
If the measurement results are to be output not as absolute values, but relative to a reference value, the
keyword :RELative can be added to the measurement command. The result is then divided by a
value that was previously set by means of CALC:REL:POW or CALC:REL:AUTO ONCE.
MEAS?
CALC:REL:AUTO ONCE
MEAS:REL?
The first MEAS command determines the reference value, which is acquired and stored with
CALC:REL:AUTO ONCE. The second measurement command MEAS:REL? and all other MEAS:REL?
commands will divide the absolute measured value by the stored reference value.
CALC:REL:POW <float_value> is used to define such a reference value.
CALC:REL:POW 0 DBM
MEAS:REL?
All measured values are then divided by 0 dBm (1 mW) prior to being transferred to the user.
The following section describes an extension of the MEAS command in which the result no longer
carries a power unit, but represents a power ratio. The reference value also must have a power unit and
be set with CALC:REL:RAT. The R&S NRP stores the reference values for power values and power
ratios independently of each other and automatically uses the correct reference value depending on the
unit of the measurement result.
The CALC:REL command is available for entering the reference value. It assumes a numeric parameter
whose unit is determined from the current device settings. This command is provided only for reasons
of compatibility and should not be used unless avoidable.
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