62 Chapter3
Making EDGE (with GSM) Measurements
Making the Power vs. Time Measurement
Changing the Measurement Setup
NOTE Parameters that are under the Advanced key seldom need to be
changed. Any changes from the default values may result in invalid
measurement data.
Make sure the Power vs. Time measurement is selected under the
Measure menu. The Meas Setup key will access a menu which allows you
to modify the averaging, trigger source, and burst sync for this
measurement (as described in the “Measurement Setup” section at the
beginning of this chapter). In addition, the following power vs. time
measurement parameters can be modified:
•
Meas Time - allows you to measure more than one timeslot. Enter a
value in integer increments of “slots” with a range of 1 to 50. The
actual measure time in µs is set somewhat longer than the specified
number of slots in order to view the complete burst.
•
Advanced - accesses a menu to change the following parameters:
RBW Filter - chooses the type of filter, either Gaussian or Flat
(Flatop). Gaussian is the best choice when looking at the overall
burst or the rising and falling edges, as it has excellent pulse
response. If you want to precisely examine just the useful part of
the burst, choose
Flat.
Res BW - sets the resolution bandwidth.
Power vs. Time Custom Masks
For the Power vs. Time measurement, you can define a user
configurable limit mask to apply to the measured burst. This feature
can only be accessed via SCPI commands. Refer to the programming
manual for further information.
Table 3-2 Power vs. Time Measurement Defaults
Measurement Parameter Factory Default Condition
Avg Bursts 10 Off
Avg Mode Exp
Avg Type Pwr Avg (RMS)
Meas Time 1 Slot
Trig Source RF Burst (Wideband)
Burst Sync Training Seq
Advanced
RBW Filter Gaussian
Res BW 500.000 kHz
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