Basic Measurement Examples
R&S
®
FSVA/FSV
115
Quick Start Guide 1321.3066.02 ─ 06
c) Press the "Trg/Gate Level" softkey and enter
50%
.
The trigger level is displayed as a horizontal line across the entire mea-
surement diagram. The R&S
FSVA/FSV displays the 1 kHz AF signal as a
static image in zero span. Use a headset to listen to the AF.
6. Activate the internal AM demodulator.
a) Press the MKR FUNC key.
b) Press the "Marker Demod" softkey.
The R&S
FSVA/FSV automatically switches on the AM audio demodulator.
A 1 kHz tone can be heard over headset. If necessary, use the volume
control knob for AF OUTPUT on the front panel to turn up the volume.
7.4
Measurements in Zero Span
For radio transmission systems that use the TDMA method (e.g. GSM or IS136),
transmission quality is determined not only by spectral characteristics but also by
characteristics 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.
7.4.1
Measuring the Power Characteristic of Burst Signals
To measure power in zero span, the R&S
FSVA/FSV offers easy-to-use functions
that measure the power over a predefined time.
7.4.1.1
Measuring the Power of a GSM Burst During the Activation Phase
Test setup
Measurements in Zero Span
