42 Chapter 3
Making a Basic Measurement
Viewing a Signal
significant, the numbers after the decimal in the marker annotation (upper-right
corner of screen) are significant. To increase the accuracy of the frequency
reading in the marker annotation, turn on the frequency count function.
a. Press
Mkr Fctn.
•The
Marker Fctn softkeys appear.
b. Press
Marker Count.
•The
Marker Count softkeys appear.
The condition of the softkey
Marker Count On Off. If Off is underlined, press
the softkey to toggle marker count on.
As shown in Figure 3-5 and Figure 3-6:
• The marker annotation changes from Mkr1 to Cntr1.
• The displayed resolution in the marker annotation improves.
NOTE When you use the frequency count function, if the ratio of the resolution
bandwidth to the span is less than 0.002, the following message appears on the
display: Freq Count: Reduce Span/RBW ratio
This indicates that the resolution bandwidth is too narrow.
11. Press
Marker ➞, Mkr ➞ CF to move the 10 MHz peak to the center of the
display.
Valid Marker Count Range
12.Move the marker down the skirt of the 10 MHz peak. Although the readout in
the active function changes, as long as the marker is at least 26 dB above the
noise, the counted value (upper-right corner of display) does not change (see
Figure 3-6). For an accurate count, the marker does not have to be at the exact
peak.
NOTE Marker count functions properly only on CW signals or discrete peaks. For a valid
reading, the marker must be 26 dB above the noise.
13.Press
BW/Avg, Res BW, then enter a new value. This action makes the
resolution bandwidth the active function and allows you to experiment with
different resolution bandwidth (RBW) values.
14.Press
Marker, Off to turn the marker off.
NOTE After properly setting the analyzer to display your signal, you can save the settings
as either a user preset (press
System, Power On/Preset, Save User Preset), or to a
file (see “Saving a File” on page 51).
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