88 Chapter2
Making Measurements
Example 7: Stimulus-Response Measurements
Figure 2-33 Decrease the resolution bandwidth to improve sensitivity.
NOTE Tracking Error
Adjusting the resolution bandwidth may result in a decrease in
amplitude of the signal. This is known as a tracking error. Tracking
errors occur when the tracking generator output frequency does not
exactly match the input frequency of the spectrum analyzer. The
resulting product from the spectrum analyzer input mixer is not at the
center of the IF bandwidth. Tracking errors are most notable when
using narrow resolution bandwidths.
Compensate for the tracking error, by using either the manual or the
automatic tracking adjustment. These keys are on the second softkey
menu page of
TRACKING GENRATOR under the AUX CTRL key.
Automatic Tracking
Once the automatic tracking routine is activated in a wide resolution
bandwidth, it is not necessary to use the tracking adjust again when
decreasing the resolution bandwidth. The automatic tracking routine
uses the 300 Hz resolution bandwidth to perform the tracking
adjustment.
To activate the automatic tracking routine, press
TRACKING PEAK, then
press
MAN TRK ADJ to display the DAC values of the coarse- and
fine-tracking adjustments. In this example, the automatic tracking
routine was performed, and the resolution bandwidth was decreased to
300 Hz, without encountering any tracking error (see Figure 2-34).
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