52Measuring a Low−Level SignalTrace AveragingTrace AveragingAveraging is a digital process in which each trace point is averaged with the previousaverage for the same trace point. Selecting averaging, when the analyzer isautocoupled, changes the detection mode from normal to sample. Sample mode maynot measure a signal amplitude as accurately as normal mode, because it may notfind the true peak.NOTE This is a trace processing function and is not the same as using the average detector(as described on page 50).Step Action Notes1 Set up the signal generator. a. Set the frequency to 300 MHz.b. Set the amplitude to −80 dBm.2 Connect the source RFOUTPUT to the analyzerRF INPUT as shown.3 Select the mode. • Press Mode, Spectrum Analyzer.4 Preset the mode. • Press Mode Preset.5 Set the center frequency,span and reference level.a. Press FREQ Channel, CenterFreq, 300, MHz.b. Press SPAN X Scale, Span, 5,MHz.c. Press AMPTD Y Scale, Ref Level,40, −dBm.
