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Chapter 5 301
One-Button Measurement Functions
MEASURE (Spectrum Analysis Mode)
One-Button Measurement Functions
5.1.3 Channel Power
Channel Power measures the power and power spectral density in the channel bandwidth
that you specify. One marker pair on the display indicates the edges of the channel
bandwidth. The center frequency, reference level, and channel bandwidth must be set by
the user. For more information see
“Meas Setup (Channel Power—CHP)” on page 399.
You can configure measurement settings by pressing
Meas Setup after selecting Channel
Power
. You can make a measurement in single or continuous sweep mode. Pressing Meas
Control
enables you to pause or restart a measurement, or toggle between continuous and
single measurement. To set Ref Level automatically, use Optimize Ref Level.
Figure 2 Channel Power Measurement Results
NOTE The displayed trace is the current trace, not the averaged trace.
Pressing
Meas Setup after Channel Power has been selected will access the channel power
measurement setup menu. Pressing
Radio Standard after Mode Setup has been selected will
access all the Radio Standards available for which this measurement can be applied.
Pressing
Meas Control after Channel Power has been selected will access the channel power
measurement control menu which allows you to pause or restart your measurement, or
toggle between continuous and single measurement.
When a DVB-T radio standard is selected, this measurement will also compare the input
signal against a pre-defined spectrum mask. The mask amplitudes defined in the DVB-T
specification (ETSI EN 300 744 V1.4.1) range from 0 dB to 100 dB. This is for power
measured in a 4kHz bandwidth therefore an adjustment to these values will need to be
made as the measurement is made in a 7.61MHz bandwidth.
The measurement makes two sweeps, one in a 4kHz bandwidth and one in a 7.61MHz
bandwidth, then computes the difference between the two. This value will be used to
adjust the mask settings. As this value is calculated as part of the measurement setup, it is