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Comparing
Signals
Using
Delta
Markers
Using the spectrum analyzer, you can easily compare frequency and
amplitude differences between signals, such as radio or television signal
spectra. The spectrum analyzer’s delta marker function lets you compare
two signals when both appear on the screen at one time or when only one
appears on the screen.
Example: Measure the differences between two signals on the same display
screen.
1. Connect the spectrum analyzer’s CAL OUT to the
INPUT
75
0.
Press
(FEE-).
The calibration signal and its harmonics appear on the display.
2. Press (PEAK SEARCH] to place a marker at the highest peak on the display.
The NEXT PK RIGHT and NEXT PK LEFT softkeys move the marker from
peak to peak. Press NEXT PK RIGHT to move the marker to the 300 MHz
calibration signal. See Figure
4-
11.
The signal that appears at the left edge of the screen is the spectrum
analyzer’s local oscillator (LO) and represents 0 Hz.
REF
4R
R
dRrn”
AT
10
dB
28.45
dBrn”
PEAK
LOG
10
dB/
NEXT
PK
RIGHT
Figure
4-11.
Placing a Marker on the CAL OUT Signal
4-18