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134 Chapter 4
Making Measurements
Making the Channel Power Measurement
• Chan Power Span - Allows you to set the frequency span for the
channel power measurement. The range is 1.000 kHz to
10.0000 MHz with 1 Hz resolution. This span is used for the current
integration bandwidth setting. Since
Chan Power Span is coupled to
Integ BW in the factory default condition, if you change the
integration bandwidth setting, the channel power span setting
changes by a proportional amount, 1.626 times the integration
bandwidth, until a limit value is reached. However, the channel
power span can be individually set.
•
Advanced - Allows you to access the following menu to modify the
channel power measurement parameters:
—
Sweep Time - Allows you to manually change the sweep time and
also to toggle the sweep time control between
Auto and Man
(manual). The range is 1.0
µs to 50.00 ms with 1 µs resolution. If
set to
Auto, the sweep time derived from the data point setting is
shown on this key regardless of the manual entry range.
—
Data Points - Allows you to select the number of data points and
also to toggle the data point control between
Auto and Man
(manual). The range is 64 to 65536 with the acceptable entry in
powers of 2 (for example: 64, 128, 512). If set to
Auto, the optimum
number of points is determined for the fastest measurement time
with acceptable repeatability. The minimum number of points
that could be used is determined by the sweep time and the
sampling rate. You can increase the length of the measured time
record (capture more of the burst) by increasing the number of
points, but the measurement will take longer.
—
Res BW - Shows information on the resolution bandwidth derived
from the sweep time. This key is always grayed out.
—
Trig Source - Allows you to choose a trigger source from Free Run
(Immediate)
, Video (IF Envlp), RF Burst (Wideband), Ext Front, Ext Rear,
Frame, I/Q Input, or Line.