Chapter 4 — Spectrum Analyzer 4-11 Channel Power Measurement
MS20xxA VNA Master UG 10580-00166 Rev. C 4-9
7. Press the Shift key then the Measure (4) key followed by the OCC BW soft key. Choose the
measurement method (
dBc Down or % Down) by pressing the Method soft key. The
selected method is underlined.
8. Press the
dBc or % soft keys to adjust the settings as needed. Common values are 99%
and 30 dBc.
9. Press the
On/Off soft key to start the measurement. An information box will appear
below the graph while occupied bandwidth measurement is on.
Figure 4-3 shows the occupied bandwidth results using the percent of power method on a
CDMA signal. Occupied Bandwidth is a constant measurement; after it is turned on, it
remains on until it is turned off by pressing the
On/Off soft key again. Occupied bandwidth is
calculated at the end of each sweep.
4-11 Channel Power Measurement
Channel power measurement is one of most common measurements for a radio transmitter.
This test measures the output power, or channel power, of a transmitter over the frequency
range. Out-of-specification power measurements indicate system faults, which can be in the
power amplifiers or in filter circuits. Channel Power measurements can be used to validate
transmitter performance, comply with government regulations, or to keep overall system
interference at a minimum.
Frequency and span settings for many signal standards can be automatically set by pressing
the
Frequency key and then the Signal Standard soft key. Choose the desired standard and press
Enter. Press the Channel # soft key to enter the channel number at which the measurement is
to take place.
Figure 4-3. Occupied Bandwidth Results Using the Percentage of Power Method
10580-00166C.book Page 9 Thursday, February 21, 2008 12:52 PM
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