Agilent Technologies 35670A Manual page 222

CALCulate
CALCulate[1|2|3|4]:UNIT:DBReference
Specifies the reference for dB magnitude trace coordinates.
Command Syntax:
<UNIT> ::= 'DBV'|"DBV"
Example Statements:
Query Syntax:
Return Format:
Attribute Summary:
Description:
This command allows you to scale the dB magnitude based on the parameter you select. The setting
applies only for the current measurement data and the specified trace. The trace specifier,
CALCulate[1|2|3|4], determines which trace you are selecting. Omit the specifier or send 1 for trace A, 2
for trace B, 3 for trace C, or 4 for trace D.
Send CALC:UNIT:DBR 'DBV' to reference the dB magnitude to 1 volt. This is the default selection.
Send CALC:UNIT:DBR 'DBM' to reference the dB magnitude to 1 milliwatt. Use the
CALC:UNIT:DBR:IMPedance command to specify an impedance value that matches the impedance of
your system under test. If transducer units are enabled, DBM units are valid only when the transducer
unit label is volts (SENSE:VOLTAGE:RANGE:UNIT:USER:LABEL 'V').
Send CALC:UNIT:DBR 'DBSPL' to set the dB magnitude reference level to 20 µPa. An engineering
unit of Pascals (Pa) must be applied to the data. See the SENSE:VOLTAGE:RANGE:UNIT:USER
commands for additional information about enabling transducer units.
Send CALC:UNIT:DBR 'DBUSER' to set your own dB magnitude reference level. Use the
CALC:UNIT:DBR:USER:REFerence command to specify the reference level. Use the
CALC:UNIT:DBR:USER:LABel command to assign a name to the Y- axis unit.
The dB magnitude reference level is only applied to traces with dB magnitude coordinates (CALC:FORM
MLOG). The dB reference scaling is applied after transducer units have been applied.
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CALCulate[1|2|3|4]:UNIT DBReference <UNIT>
'DBM'|"DBM"
'DBSLP'|"DBSPL"
'DBUSER'|"DBUSER"
OUTPUT 711;"CALC:UNIT:DBREFERENCE 'DBM'"
OUTPUT 711;"calc3:unit:dbr 'DBUSER'"
CALCulate[1|2|3|4]:UNIT:DBReference?
"DBV"|"DBM"|"DBSPL"|"DBUSER"
Option: not applicable
Synchronization Required:
Preset State: "DBV"
SCPI Compliance:
yes
instrument-specific
command/query