Chapter 4 Channel Power Operation
Changing the sweep time
90 9102 Handheld Spectrum Analyzer Software version 5.31
Defining the frequency
span
The 9102 can display either the full spectrum used by the system, or
the channel to be measured. Select the frequency span as desired:
In the main menu, select either
Full System or Single Channel.
If you select Full System, the full frequency band as defined for the
communication system will be displayed. If you select Single
Channel, only the frequency range of the currently selected
channel will be shown.
Changing the channel 1 In the main menu, push the Channel softkey.
The Channel input field opens.
2 Enter the desired channel number within the communication
system at hand, or select the channel number with the U
P/DOWN
cursor keys.
3Press E
NTER to confirm.
The channel power for the selected channel is indicated in the
upper left-hand corner.
Changing the sweep time
The sweep time (SWT) determines how long it takes for a complete
sweep over the measured frequency range (span).
By default, the 9102 automatically selects the sweep time depending
on other measurement parameters such as the span. In some cases it
may be an advantage to manually select a different sweep time. This is
the case with pulsed signals where a longer sweep time may increase
the measurement accuracy. If manually set, the sweep time should be
selected long enough for the filtered signal to reach steady state. The
9102 will output an “UNCALibrated” warning if the sweep time is too
low.
To change the sweep time in channel power mode, proceed as follows:
1 From the main menu, select
Measure.
2 Push the
SWT softkey.
3 Enter the new sweep time and confirm with the appropriate enter
key for the unit.
Setting up the level parameters
The accuracy and the dynamic range between the measured signal
and the noise floor depend on the proper setting of the level settings.
These consist of the reference level and the attenuation.
The reference level basically determines the level at the top of the
display. The vertical axis is divided into eight horizontal rows; you can
adjust the scale (which defaults to 10 dB per line) to your preferences.
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