52 Chapter3
Making EDGE (with GSM) Measurements
Preparing for Measurements
• Avg Type - Select the averaging type from the following selections:
(Not all of the selections are available for all measurements)
Pwr Avg (RMS) - The true power averaging, and is equivalent to
taking the RMS of the voltage. It is the most accurate type.
Log-Pwr Avg (Video) - Simulates the traditional spectrum analyzer
type of averaging by averaging the log of the power.
Mean - Averages the mean values.
Voltage Avg - Averages the voltage values.
Maximum - Keeps track of the maximum values.
Minimum - Keeps track of the minimum values.
Max & Min - Keeps track of the maximum and minimum values.
Trig Source
Changing the selection in the
Trig Source menu alters the trigger source
for the selected measurement only. Not all of the selections are
available for all measurements. Note that the
RF Burst (Wideband),
Video (IF Envlp), Ext Front, and Ext Rear menu keys found in the Trigger
menu enable you to change settings to modify the delay, level, and slope
for each of these trigger sources. Choose one of the following trigger
sources:
•
Free Run (Immediate) - The trigger occurs at the time the data is
requested, completely asynchronous to the RF or IF signal.
• RF Burst (Wideband) - An internal wideband RF burst trigger that
has an automatic level control for burst signals. It triggers on a level
that is relative to the peak of the signal passed by the RF.
•
Video (IF Envlp) - An internal IF envelope trigger. It triggers on an
absolute threshold level of the signal passed by the IF.
• Ext Front - Activates the front panel external trigger input (EXT
TRIGGER INPUT). The external trigger must be a signal between −5
and +5 volts.
• Ext Rear - Activates the rear panel external trigger input (TRIGGER
IN). The external trigger must be a signal between −5 and +5 volts.
•
Frame - Uses the internal frame clock to generate a trigger signal.
The clock parameters are controlled under the
Mode Setup key or the
measurement firmware, not both. See the specific measurement for
details.
Rear panel
TRIGGER 1 OUT and TRIGGER 2 OUT connectors are coupled
to the selected trigger source. These trigger outputs are always on the
rising edge with a pulse width of at least 1 µs.
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