RFmxSpecAn CHP Fetch Measurement VI
- Updated2025-10-13
- 3 minute(s) read
Returns the averaged channel power measurements.
Use "carrier<n>" as the selector string to read results from this VI.

Inputs/Outputs
Selector String
—
Selector String specifies a selector string comprising of the signal name, result name, and carrier number. If you do not specify the signal name, the default signal instance is used. If you do not specify the result name, the default result instance is used. Example: "carrier0" "signal::sig1/carrier0" "result::r1/carrier0" "signal::sig1/result::r1/carrier0" You can use the RFmxSpecAn Build Carrier String2 VI to build the selector string.
Instrument Handle In
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Instrument Handle In specifies the RFmx session refnum. Instrument Handle In is obtained from the RFmxInstr Initialize NIRFSA VI.
Timeout (s)
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Timeout specifies the timeout, in seconds, for fetching the specified measurement. Set this value to an appropriate time, longer than expected for fetching the measurement. A value of -1 specifies that the VI waits until the measurement is complete. The default value is 10.
error in (no error)
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error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
Frequency Resolution (Hz)
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Frequency Resolution returns the frequency bin spacing, in Hz, of the spectrum acquired by the measurement.
Instrument Handle Out
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Instrument Handle Out passes a reference of your RFmx session to the next VI.
Absolute Power (dBm)
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Absolute Power returns the averaged channel power, in dBm, measured in the specified integration bandwidth.
PSD (dBm/Hz)
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PSD returns the power spectral density of the channel, in dBm/Hz.
Relative Power (dB)
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Relative Power returns the carrier power, in dB, measured relative to the total carrier power.
error out
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error out contains error information. This output provides standard error out functionality. |
Selector String
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Instrument Handle In
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Timeout (s)
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error in (no error)
—
Frequency Resolution (Hz)
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Instrument Handle Out
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error out
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