Agilent Technologies E7404A, E7405A manual Tracking Drifting Signals, Tracking Signal Drift Example

Making Basic Measurements

Tracking Drifting Signals

Tracking Drifting Signals

The signal track function is useful for tracking drifting signals that drift relatively slowly. To place a marker on the signal you wish to track, use Peak Search. Pressing FREQUENCY, Signal Track (On) will bring that signal to the center frequency of the graticule and adjust the center frequency every sweep to bring the selected signal back to the center. A quick way to perform the Peak Search, FREQUENCY,

Signal Track, SPAN key sequence is to use the Span Zoom key in the SPAN menu.

Note that the primary function of the signal track function is to track unstable signals, not to track a signal as the center frequency of the analyzer is changed. If you choose to use the signal track function when changing center frequency, check to ensure that the signal found by the tracking function is the correct signal.

Tracking Signal Drift Example 1:

Use the signal track function to keep a drifting signal at the center of the display and monitor its change.

This example requires a signal generator. The frequency of the signal generator will be changed while you view the signal on the display of the analyzer.

1.Connect a signal generator to the analyzer input.

2.Set the signal generator frequency to 300 MHz with an amplitude of

− 20 dBm.

3.Set the analyzer as follows:

a. Press Preset, Factory Preset (if present).

b. Set the Y-Axis Units to dBm by pressing AMPLITUDE, More, Y-Axis Units, dBm.

c. Set the resolution bandwidth to the spectrum analyzer coupling by pressing BW/Avg, Resolution BW (SA). See Figure 1-17.

d. Set the center frequency to 300 MHz by pressing FREQUENCY, Center Freq, 300, MHz.

Chapter 1 27