Keithley 2002

IEEE-488 Reference
3-160
This command is used to specify the dB reference level. When DB units is selected (:VOLT-
age: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.
PRINT #1, "output 16; :unit:volt:ac:db:ref 2; ref?" ' Set dB reference
PRINT #1, "enter 16" ' Get response message
from 2002
:DBM:IMPedance <n>
:UNIT:VOLTage:AC:DBM:IMPedance <n> Specify dB reference
<n> = 1 to 9999 Specify reference impedance
:IMPedance?
:IMPedance? DEFault
:IMPedance? MINimum
:IMPedance? MAXimum
This command is used to specify the dBm reference impedance level. When dBm units is select-
ed ACV 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 600Ω on all ACV measurement ranges. A rational number is rounded
to the nearest valid integer value.
PRINT #1, "output 16; :unit:volt:ac:dbm:imp 600; imp?" ' Select dBm impedance
PRINT #1, "enter 16" ' Get response message
from 2002
Description
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Description
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