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24 Chapter 1
Making Basic Measurements
Decreasing the Frequency Span Around the Signal
Decreasing the Frequency Span Around the
Signal
Using the analyzer signal track function, you can quickly decrease the
span while keeping the signal at center frequency. This is a fast way to
take a closer look at the area around the signal to identify signals that
would otherwise not be resolved.
Decreasing the Frequency Span Example:
Examine a signal in a 200 kHz span.
1. Perform a factory preset by pressing Preset, Factory Preset (if
present).
2. Turn on the internal 50 MHz amplitude reference signal of the
analyzer as follows:
• For the E7401A, use the internal 50 MHz amplitude reference
signal of the analyzer as the signal being measured. Press
Input/Output, Amptd Ref (On).
• For all other models connect a cable between the front-panel
AMPTD REF OUT to the analyzer INPUT, then press
Input/Output, Amptd Ref Out (On).
3. Set the start frequency to 20 MHz by pressing FREQUENCY,
Start Freq, 20, MHz.
4. Set the stop frequency to 1 GHz by pressing FREQUENCY, Stop Freq,
1, GHz.
5. Set the Y-Axis Units to dBm by pressing AMPLITUDE, More,
Y-Axis Units,
dBm.
6. Set the resolution bandwidth to spectrum analyzer coupling pressing
BW/Avg, Resolution BW (SA).
7. Press Peak Search to place a marker at the peak. See Figure 1-14.