Agilent Technologies Agilent 4396B - Manual (Page 74)

Tracking an Unstable Signal
In this example , the signal is drifting.
1. Press 4 Displa y 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
DUAL CHAN on OFF to
NNNNNNNNNNNNNNNNNNNN
ON off .
2. Press 4 Chan 1 5 .
3. Press 4 Ma rk er 5 to turn the marker on.
4. Use the knob to bring the marker close to the signal you want to
track.
5. Press 4 Search 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SIGNAL TRK on OFF to turn the signal track on. As
the signal drifts , the center frequency automatically changes to
bring the signal and the marker to the center of the display .
Figure 4-5 shows a display when signal track is ON at channel 1.
Figure 4-6 shows a display after the analyzer sweeps a few times .
At channel 1, the center frequency has been changed to maintain
the drifting signal at the center of the display . Channel 2 shows
that signal frequency has drifted to a higher frequency .
Figure 4-5. Display When Starting Signal Track
Figure 4-6. Display After Signal Has Drifted
4-6 Spectrum Measurement Examples