5-74 SCPI Command Reference
:DB:REFerence <n>
:UNIT:VOLTage[:DC]:DB:REFerence <n> Specify dBm reference
Parameter <n> = 1e-7 to 1000 Specify reference in volts
Query :REFerence?
Description This command is used to specify the dB reference level. When DB units is
selected (:VOLTage[:DC]:DB), DCV dB measurements are made using the
specified dB reference level.
The reference level is specified in volts and is not range dependent. For
example, a dB reference level of 1 is 1V on all DCV measurement ranges.
:DBM:IMPedance <n>
:UNIT:VOLTage[:DC]:DBM:IMPedance <n> Specify dB reference
Parameters <n> = 1 to 9999 Specify reference impedance
Query :IMPedance?
Description This command is used to specify the dBm reference impedance level. When
dBm units is selected, DCV dBm measurements are made using the specified
dBm reference impedance.
The reference impedance is specified in ohms and is not range dependent.
For example, a dBm reference level of 600 is 600 on all DCV measurement
ranges. A rational number is rounded to the nearest valid integer value.
:DISTortion commands
:DISTortion <name>
:UNIT:DISTortion <name> Specify distortion units
Parameters <name> = PERCent Percent distortion
DB Decibels of distortion
Query :DISTortion? Query distortion units
Description This command selects the output format for the distortion calculation, either
percent distortion or dB, where dB is the relative magnitude of the harmonics
to the fundamental.
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