User`s guide

46 N9320A Spectrum Analyzer

3 Functions and Measurements

Tracking Drifting Signals

This section provides information on measuring and tracking

signals that drift in frequency.

Measuring a Source’s Frequency Drift

The analyzer will measure source stability. 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 you can measure

and determine how much of the frequency spectrum a signal

occupies. For more information, refer to “Max Hold” on

page 119.

Use signal tracking to return a signal drifting in frequency

to the center of the display. The drifting is captured by the

analyzer using the maximum hold function.

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