User`s guide

Functions and Measurements 3

N9320A Spectrum Analyzer 45

Tracking Drifting Signals

This section provides information on measuring and tracking

signals that drift.

Measuring a Source’s Frequency Drift

The analyzer allows you to measure the stability of a source.

The maximum amplitude level and the frequency drift of an

input signal trace can be displayed and held by using the

maximum hold function. Using the maximum hold function

also allows you to determine how much of the frequency

spectrum a signal occupies. For more information, please

refer to “Max Hold” on page 116.

Use signal tracking to keep a drifting signal in the center of

the display. The drifting is captured by the analyzer using

maximum hold.

1 Connect the signal generator to the analyzer RF IN.

2 Output a signal with the frequency of 300 MHz and

amplitude of –20 dBm.

3 Set the analyzer center frequency, span and reference level.

Press > Preset. (With Preset Type of Factory)

Press > Center Freq > 300 > MHz

Press > Span > 10 > MHz

Press > Ref Level > –10 > dBm

4 Place a marker on the peak of the signal and turn signal

tracking on:

Press

Press > Signal Track (On)

Press > 1 > MHz

Notice that this holds the signal in the center of the display.

Preset/

System

Frequency

SPAN

Amplitude

Peak

Frequency

SPAN