Decreasing the Frequency Span Using the Marker Track Function
Using the spectrum analyzer’s marker track function, you can quickly decrease the span while keeping the signal at center frequency.
Example: Examine a carrier signal in a 200 kHz span
1.Press CPRESET_], tune to a carrier signal, and place a marker at the peak. (If you are using the CAL OUT signal, place the marker on the 300 MHz calibration signal. Press (FREQUENCY], 300 (MHz), m, 200 IFvlHz), and
CPEAK S E A R C H ) . )
2.Press ljjFCTN), MK TRACK ON OFF (ON) and the signal will move to the center of the screen, if it is not already positioned there (note that the marker must be on the signal). Because the marker track function automatically maintains the signal at the center of the screen, you can reduce the span quickly for a closer look. If the signal drifts off of the screen as you decrease the span, use a wider frequency span.
3.Press (?i%), 200 m. The span decreases in steps as automatic zoom is completed. See Figure
decrease the span or use the PEAK ZOOM function under ISPAN).
Press MK TRACK ON OFF again so that (OFF) is underlined to turn off the marker track function.
N O T E
When you are finished with the example, turn off the marker tracking function.
