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Making Measurements Using Spectrum Analyzer Mode
Using the Power Measurement Functions to make Transmitter Measurements
Occupied
Bandwidth
and
Transmitter
Frequency
Error
You often need to confirm a channel’s 99% occupied bandwidth. The
OCCUPIED BANDWDTH function does this easily. The user enters the channel
spacing and activates the occupied bandwidth function. Markers show the
power bandwidth edges, and the spectrum analyzer calculates and displays:
l The total power in
dBmV
(other units selectable)
l The occupied bandwidth (99% power bandwidth)
l The transmitter frequency error
The transmitter frequency error is the frequency difference between the
midpoint of the power bandwidth and the spectrum-analyzer’s center
frequency.
For special applications you can change the percent power bandwidth from
1% to 99.99% using the OCC
BM
%
POWER key.
Example: Measure the 99% occupied bandwidth.
1. Connect a signal to the spectrum analyzer’s INPUT 75
a2
2. Press
CFREQUENCY)
and enter the frequency of your input signal to place
the signal at the spectrum-analyzer center frequency.
3. Press
[AMPLITUDE]
and adjust the reference level to bring the signal near
the top of the display.
4.
Press
(-1
and Power Menu to access the power measurement
functions. Press Setup and CHANNEL SPACING to enter the value for
the channel spacing. The span is automatically set to be three times the
channel spacing value. The center frequency step size is automatically set
to be equal to the channel spacing. Press Previous Menu to return to
the main power menu.
5. Press OCCUPIED BANDWDTH to activate the function.
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