Boonton 52000 Series USB CW Power Sensor - Manual (Page 32)

2 Using the Software
8 1 2 3 4 5 6 7 8 1
TB
3
Data
57 57
Data Training
26
f
1
f
1
TB
3
GB
8.25
1 TDMA frame (4.615 ms)
1 timeslot (0.577 ms)
TB = Tail Bits
f = Flag
GB = Guard Band
Figure 2 GSM TDMA structure and normal burst
In some cases, when the modulation is GPRS, multiple time slots are
used. The correct duty cycle can be found by multiplying 11.6% by
the number of active time-slots.
Making a measurement
Follow this procedure:
1. Start the application.
2. zero the sensor.
Refer to “Zero your sensor” on page 26.
3. Open the measurement control panel. Select the control panel icon
or select Measurement > Control Panel.
4. Enable the duty cycle option and set the duty cycle percentage to
11.6%.
5. Select Apply.
The sensor will read the GSM phone power in the active part of the
time slot with reasonable accuracy.