During remote operation of the Spectrum Monitor you should configure the trigger arm to single, see SETup:SMONitor .
If the trigger arm is not set to single, the Spectrum Monitor may not return a result. When trigger arm is continuous the Spectrum Monitor rearms itself and starts another measurement cycle, during remote operation the fetch query may not be synchronized to the measurement cycle, see Measurement States .
If trigger source immediate is used for burst modulated signals the results returned will be unreliable. Burst modulated signals should be measured with Trigger Source set to RF Rise or Auto. For RF Rise triggering to work correctly, the signal should be no less than 20 dB below the reference and greater than -20 dBm.
See Integrity Indicator .