32 Chapter 4
Power vs. Time Measurements
Measurement Procedure
Measurement Procedure
Step 1. Press Mode, TD-SCDMA with HSPA/8PSK to enable the TD-SCDMA with
HSPA/8PSK mode measurements.
Step 2. Press
Mode Preset to preset the analyzer.
Step 3. Press
Input/Output, External Gain, BTS and enter the number and −dB
according to the external attenuator connected to the analyzer.
Step 4. Press
Mode Setup, Radio, Device to toggle the device to BTS.
Step 5. Press
Trigger to select the appropriate trigger source External 1.
If no measurement is performed and only a symbol of yellow ‘*’ displays
on the top right of the screen, you need to check the trigger settings.
You need the correct trigger signal to make the Power vs Time
measurement.
Step 6. Press
FREQ Channel, 2, GHz to set the center frequency to 2 GHz.
Step 7. Press
Meas, Power vs Time to initiate the Power vs Time measurement.
Step 8. Press
Restart or Single to perform the measurement once.
NOTE Power vs Time measurement is set in the Single sweep mode. Because
of the switching of the Preamp state from On to Off, performing Power
vs Time measurements in the Continuous sweep mode is not
recommended.
After you change the parameters, press
Restart or Single to perform the
measurement again.
Step 9. Press
Meas Setup to check the keys available to change the measurement
parameters from the default condition.
• To extend the number of timeslots to be measured, press
Meas
Interval
and enter the number of timeslots. DwPTS or UpPTS will be
counted as a separate timeslot. The start timeslots is determined by
Analysis Timeslot.
• To make an averaged measurement, press
Avg/Hold Num to toggle
the state to
On and enter the number of averages. Each single
measurement will perform the averages twice.
• To select the averaging algorithm, toggle the
Avg Mode key between
Exp and Repeat. A Repeat averaged measurement is faster than an
Exponential averaged measurement.
•Press
IF Gain, Low Gain to measure large signals. Option High Gain
allows better noise level measurements.
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