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

  • 22The trace option on the Agilent HSAs allows up to four different traces to be displayed. The multiple traces can include combinations of Max Hold, Min Hold, stored memory, and active measurements with different detection options including the default “positive peak”. Additional information regarding detection modes can be found in the Agilent application note "8 Hints for Better Spectrum Analysis" (literature number 5965-7009E).Another useful display option on the Agilent HSA is the spectrogram. A spectro-gram is a unique way to examine frequency, time, and amplitude on the same display. The spectrogram shows the progression of the frequency spectrum as a function of time where a color scale represents the amplitude of the signal. In a spectrogram, each frequency trace occupies a single, horizontal line (one pixel high) on the display. Elapsed time is shown on the vertical axis resulting in a display that scrolls upwards as time progresses.Figure 15 shows a spectrogram of a signal with a transmitter that is intermit-tently active. In the figure, the red color in the spectrogram represents the fre-quency content with the highest signal amplitude. The spectrogram may provide an indication to the timing of the interference and how the signal bandwidth may change over time. The spectrogram can be stored to the internal memory of the Agilent HSA or onto an external USB flash drive.Figure 15. Dual display option showing a spectrogram and the frequency spectrum of a signal with intermittent transmissionInterference Measurement Procedure (continued)SpectogramTimeTransmitter OnTransmitter OffTransmitter OnColor scale