Measurements In Zero Span; Measuring The Power Characteristic Of Burst Signals - R&S ESR Series User Manual

Emi test receiver

Table of Contents

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.

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

Table 3-8: Signal generator settings (e.g. R&S SMU)

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.

User Manual 1175.7068.02 ─ 12

Basic Measurement Examples

GSM, one timeslot activated

Show Quick Links

Table of Contents