Keithley 2000 User Manual page 214

5-76 SCPI Command Reference
:DB:REFerence <n>
:UNIT:VOLTage[:DC]:DB:REFerence <n>
Parameter
Query
Description
:DBM:IMPedance <n>
:UNIT:VOLTage[:DC]:DBM:IMPedance <n>
Parameters
Query
Description
<n> = 1e-7 to 1000 Specify reference in volts
:REFerence?
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 ex-
ample, a dB reference level of 1 is 1V on all DCV measurement ranges.
<n> = 1 to 9999 Specify reference impedance
:IMPedance?
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.
Specify dBm reference
Specify dB reference