Interference Testing with Handheld Spectrum Analyzers Manual

Interference Testing with Handheld Spectrum Analyzers Manual
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Interference Testing with Handheld Spectrum Analyzers Manual

  • 18Even without a pre-amp, the noise floor of the analyzer can be optimized using the RBW filter. The RBW filter on the Agilent N934xC HSA is adjusted under the [BW] menu and using the {RBW} setting. Often an automatic setting for RBW will provide a sufficient noise floor on the instrument and manually reducing the RBW will further reduce the observable noise floor.Figure 11 shows the improvement in the measured noise floor when the RBW is reduced by a factor of ten. For this measurement, the RBW was manually changed from 100 kHz to 10 kHz and the noise floor improved by 10 dB. In this example, the measured peak was the same in both cases, as would be the case for any signal that has bandwidth smaller than the RBW setting. As a result, the measured SNR is improved due to a change in the noise floor.Figure 11. Improvement in the analyzer’s noise floor when reducing the RBW setting by a factor of 10. For narrow bandwidth signals, the SNR improves when the RBW is reducedRBW = 100 kHzRBW = 10 kHzPeak10 dBFigure 10. Measurement showing the noise floor improvement when using the HiSensitivity setting on the Agilent H934xC Series HSAHi Sensitivity ONHi Sensitivity OFF20 dBReceivers and Spectrum Analyzers (continued)