Quick Start
R&S
®
ESR
106
User Manual 1175.7068.02 ─ 12
3.5.4
Measurements in Zero Span
For radio transmission systems that use the TDMA method (e.g. GSM or IS136), trans-
mission quality is determined not only by spectral characteristics but also by character-
istics in zero span. A timeslot is assigned to each user since several users share the
same frequency. Smooth operation is ensured only if all users adhere exactly to their
assigned timeslots.
Both the power during the send phase as well as the timing and duration of the TDMA
burst, and rise and fall times of the burst, are important.
3.5.4.1
Measuring the Power Characteristic of Burst Signals
To measure power in zero span, the R&S
ESR 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
Test setup
Table 3-8: Signal generator settings (e.g. R&S SMU)
Frequency
890 MHz
Level
0 dBm
Modulation
GSM, one timeslot activated
1. Set the signal analyzer to the default state by pressing the [PRESET] key.
The R&S
ESR is set to its default state.
2. Select "Spectrum" mode.
3. Set the center frequency to 890 MHz, the span to 0 Hz and the resolution band-
width to 1 MHz.
a) Press the [FREQ] key and enter
890 MHz
.
b) Press the [SPAN] key and enter
0 Hz
, or press the "Zero Span" softkey.
4. Set the reference level of the R&S
ESR to 10 dBm (= level of the signal generator
+10 dB) and set the attenuation to 20 dB.
a) Press the [AMPT] key.
b) Enter
10 dBm
.
c) Press the "Rf Atten Manual" softkey.
d) Enter
20 dB
.
5. Set the sweep time to 1 ms.
a) Press the [SWEEP] key.
Basic Measurement Examples
