50Measuring a Low−Level SignalUsing the Average Detector and Increased Sweep TimeUsing the Average Detector and Increased Sweep TimeWhen the analyzer noise masks low-level signals, changing to the average detectorand increasing the sweep time smooths the noise and improves the signal visibility.Slower sweeps are required to average more noise variations.Step Action Notes1 Set up the signalgenerator.a. Set the frequency to 300MHz.b. Set the amplitude to−80 dBm.2 Connect the source RFOUTPUT to the analyzerRF INPUT as shown.3 Select the mode. • Press Mode, SpectrumAnalyzer.4 Preset the mode. • Press Mode Preset.5 Set the center frequency,span and reference level.a. Press FREQ Channel,Center Freq, 300, MHz.b. Press SPAN X Scale, Span,5, MHz.c. Press AMPTD Y Scale,Ref Level, 40, −dBm.
