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5-76 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 ex-

ample, 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.

Keithley 2000 User Manual

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