Keithley 2001 Operator's Manual page 384

IEEE-488 Reference
Parameters
Format
Defaults
Description
Programming example
4-226
Line 10 Two commands in this program message; the first selects dB units for ACV measure-
ments, and the second queries units.
Line 20 Addresses the Model 2001 to talk.
Line 30 Displays the selected units (DB).
:DB:REFerence <n>
:UNIT:VOLTage:AC:DB:REFerence <n>
<n> = 0.001 to 750 Specify reference in volts
= DEFault
= MINimum
= MAXimum 750V reference
:unit:volt:ac:db:ref <n>
Power-up
*RST
:SYSTem:PRESet
:REFerence?
:REFerence? DEFault
:REFerence? MINimum
:REFerence? MAXimum
Short-form formats: :unit:volt:ac:db:ref?
:unit:volt:ac:db:ref? def
:unit:volt:ac:db:ref? min
:unit:volt:ac:db:ref? max
Response message: 0.001 to 750
This command is used to specify the dB reference level. When DB units is selected
(:VOLTage:AC: DB), ACV db measurements will be 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.
10 OUTPUT 716; ":unit:volt:ac:db:ref 2; ref?"
20 ENTER 716; A$
30 PRINT A$
40 END
Line 10 Two commands in this program message; the first sets the dB reference level to 2V,
and the second queries the reference level.
Line 20 Addresses the Model 2001 to talk.
Line 30 Displays the reference level (2).
:DBM:IMPedance <n>
:UNIT:VOLTage:AC:DBM:IMPedance <n>
Specify dBm reference
1V reference
0.001V reference
Saved power-on setup
1V
1V
Specify dB reference
2001-900-01 Rev. K / August 2010