User Manual

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
250User Manual 1178.3370.02 ─ 03
Table 7-7: Signal generator settings (e.g. R&S SMW)
Frequency 890 MHz
Level 0 dBm
Modulation GSM, one timeslot activated
The measurement is based on the example "Measuring the Power of a GSM Burst
During the Activation Phase" on page 248.
1. Switch off the power measurement.
a) Press the MEAS key.
b) Select "All Functions Off" .
2. Increase the time resolution to 100
µs (SWEEP > "Sweep Time Manual" ).
3. Shift the rising edge of the GSM burst to the center of the display by defining a trig-
ger offset.
a) Press the TRIG key.
b) Select "Trigger Offset" .
c) By turning the rotary knob counterclockwise, reduce the trigger offset until the
burst edge is displayed in the center of the display, or enter -50
µs.
The R&S FPL1000 displays the rising edge of the GSM burst.
Figure 7-16: Rising edge of the GSM burst displayed with high time resolution
Measurements and Results