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Chapter 3 39
Making a Basic Measurement
Viewing a Signal
Figure 3-2 Span Changed to 50 MHz
Reading Frequency & Amplitude
7. Place a marker (labeled 1) on the 10 MHz peak, as shown in Figure 3-3.
Press
Peak Search.
Note that the frequency and amplitude of the marker appear both in the active
function block, and in the upper-right corner of the screen. You can use the knob, the
arrow keys, or the softkeys in the Peak Search menu to move the marker. Pressing
Esc removes the value from the display.
8. If you have moved the marker, return it to the peak of the 10 MHz signal.
Changing Reference Level
9. Press
AMPLITUDE, and note that reference level (Ref Level) is now the active function.
Press
Marker ➞, Mkr ➞ Ref Lvl.
Note that changing the reference level changes the amplitude value of the top
graticule line.
Figure 3-4 shows the relationship between center frequency and reference level. The
box represents the analyzer display. Changing the center frequency changes the
horizontal placement of the signal on the display. Changing the reference level
changes the vertical placement of the signal on the display. Increasing the span
increases the frequency range that appears horizontally across the display.
10 MHz Peak