CALCulate:SCALe:DB:REFerence {<reference> | MIN | MAX | DEF} [, (@<ch_list>)]
CALCulate:SCALe:DB:REFerence? [{(@<ch_list>) | MIN | MAX | DEF}]
Stores a relative value in the dB Relative Register, which is used for the dB function in
CALCulate:SCALe:FUNCtion. When the dB function is enabled, this value is subtracted from each voltage meas-
urement after the measurement is converted to dBm.
Parameter Typical return
<reference> = -200.0 dBm to +200.0 dBm
Default: 0
+3.00000000E+02
Sets dB scaling with a -10 dB reference and a 300 Ω dBm reference resistance:
CALC:SCAL:DBM:REF 300
CALC:SCAL:DB:REF -10.0
CALC:SCAL:FUNC DB
CALC:SCAL:STAT ON
– Specifying a reference value disables automatic reference selection (CALCulate: SCALe:REFerence:AUTO OFF).
– The dB relative value parameter is relative to the dBm reference resistance set with
CALCulate: SCALe:DBM:REFerence.
– The instrument sets the reference value to 0.0 with automatic reference selection enabled after a Factory Reset
(*RST), an Instrument Preset (SYSTem:PRESet), or a change in measurement function.
CALCulate:SCALe:DBM:REFerence {<reference> | MIN | MAX | DEF} [, (@<ch_list>)]
CALCulate:SCALe:DBM:REFerence? [{(@<ch_list>) | MIN | MAX | DEF}]
Selects the reference resistance for converting voltage measurements to dBm. This reference value affects the dBm
and dB scaling functions.
Parameter Typical return
<reference> = 50, 75, 93, 110, 124, 125, 135, 150, 250, 300, 500, 600, 800, 900,
1000, 1200 or 8000 Ω.
Default: 600
+3.00000000E+02
Sets dBm scaling with a reference resistance of 300 Ω:
CALC:SCAL:DBM:REF 300
CALC:SCAL:FUNC DBM
CALC:SCAL:STAT ON
– The instrument sets the reference value to 0.0 with automatic reference selection enabled after a Factory Reset
(*RST), an Instrument Preset (SYSTem:PRESet), or a change in measurement function.
74
Keysight DAQ970A/DAQ973A Programming Guide
2 SCPI Programming
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