Measurements
R&S
®
FSW
130
User Manual 1173.9411.02 ─ 19
5.2.5.1
Measuring the Power Characteristic of Burst Signals
To measure power in zero span, the R&S
FSW offers easy-to-use functions that mea-
sure the power over a predefined time.
Measuring the Power of a GSM Burst During the Activation Phase
Signal
Generator
R&S FSW
Fig. 5-13: Test setup
Table 5-6: Signal generator settings (e.g. R&S SMU)
Frequency
890 MHz
Level
0 dBm
Modulation
GSM, one timeslot activated
1. Select PRESET to reset the instrument.
2. Set the center frequency to
890
MHz
(FREQ).
3. Set the frequency span to
0
Hz
(SPAN > "Zero Span").
4. Set the reference level to
10
dBm
(= level of the signal gen10
dB) (AMPT).
5. Set the attenuation to
20
dB
(AMPT > "Rf Atten Manual").
6. Set the resolution bandwidth to
1
MHz
(BW > "Res BW").
7. Set the sweep time to
1
ms
(SWEEP > "Sweeptime Manual").
The R&S
FSW shows the GSM burst continuously across the display.
8. Using the video trigger, set triggering on the rising edge of the burst.
a) Press the TRIG key.
b) Set the "Trg/Gate Source" to "Video".
c) Set the "Trg/Gate Level" to
70%
.
The R&S
FSW shows a static image with the GSM burst at the start of the trace.
The trigger level is displayed as a horizontal line labeled with the absolute level for
the trigger threshold in the measurement diagram.
9. Activate power measurement within the activation phase of the burst in zero span.
a) Press the MEAS key.
b) Select "Time Domain Power".
c) Select "Time Dom Power Config".
d) Set the "Limits" state to "On".
e) Select the "Left Limit" input field.
Basic Measurements
