User manual

:DB:REFerence <n>
:UNIT:VOLTage:AC:DB:REFerence <n> Specify dBm reference
Parameter <n> = le-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:AC: DB), ACV 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 ACV measurement ranges.
:DBM:IMPedance <n>
:UNIT:VOLTage:AC:DBM:IMPedance <n> Specify dB reference
Parameter <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 ACV dBm measurements are made using the
specified dBm reference impedance.
The reference impedance is specified in ohms and is not range depen-
dent. For example, a dBm reference level of 600 is 600 on all ACV mea-
surement ranges. A rational number is rounded to the nearest valid
integer value.
[:DC] <name>
:UNIT:VOLTage:DC <name> Specify DCV units
Parameters <name> = V DC voltage measurement units
DB dB DC voltage measurement units
DBM dBm DC voltage measurement units
Query [:DC]? Query DC voltage units
Description This command is used to select the units for DCV measurements. With
volt (V) units selected, normal DC voltage measurements are made for
the DCV function. With DB units selected, DC dB voltage measurements
are performed. The DBM units selection is used to make decibel mea
-
surements referenced to 1mW. dB and dBm measurements are ex-
plained further in Section 2.
:DB:REFerence <n>
:UNIT:VOLTage[:DC]:DB:REFerence <n> Specify dBm reference
Parameter <n> = 1e-7 to 1000 Specify reference in volts
2000-900 (J - Aug 2010) BOOK.fm Page 75 Wednesday, October 12, 2011 12:29 PM