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40 Chapter 1
Making Basic Measurements
Measuring Low Level Signals
1. Connect a signal generator to the analyzer input.
2. Set the signal generator frequency to 300 MHz with an amplitude of
−80 dBm.
3. On the analyzer, perform a factory preset by pressing Preset,
Factory Preset (if present).
4. Set the center frequency of the analyzer to 300 MHz by pressing
FREQUENCY, Center Freq, 300, MHz.
5. Set the span to 5 MHz by pressing SPAN, Span, 5, MHz.
6. Set the resolution bandwidth to spectrum analyzer coupling by
pressing
BW/Avg, Res BW (SA).
7. Set the Y-Axis Units to dBm by pressing AMPLITUDE, More,
Y-Axis Units,
dBm.
8. Set the reference level to −40 dBm by pressing AMPLITUDE, Ref Level,
–40, dBm.
9. Place the signal at center frequency by pressing Peak Search,
Marker→, Mkr→CF. See Figure 1-32.
Figure 1-32 Without Video Averaging
10.Pressing BW/Avg, Average Type, (Video Avg), Average (On), initiates
the video averaging routine. As the averaging routine smooths the
trace, low level signals be come more visible. Average 100 appears
in the active function block. The number represents the number of
samples (or sweeps) taken to complete the averaging routine. Once
the set number of sweeps has been completed, the analyzer
continues to provide a running average based on this set number.