Rohde & Schwarz FSQ series, Quick Start Manual

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Quick Start Guide 1313.9652.62 - 02 5.25
R&S FSQ Basic Measurement Examples
Measurements in the Time Domain
5.5.3 Measuring the Signal-to-Noise Ratio of Burst Signals
When TDMA transmission methods are used, the signal-to-noise ratio or the deactivation
dynamic range can be measured by comparing the power values during the activation phase
and the deactivation phase of the transmission burst. For this purpose, the R&S FSQ provides
the function for measuring absolute and relative power in the time domain. In the following
example, the measurement is performed using a GSM burst.
5.5.3.1Example - Signal-to-Noise Ratio of a GSM Signal
Test setup:
Settings on the signal generator (e.g. R&S SMIQ):
Measurement with the R&S FSQ:
1. Reset the instrument.
➢
Press the PRESET key.
The R&S FSQ is now in the default state.
2. Set the center frequency to 100 MHz, the span to 0 Hz and the resolution bandwidth
to 1 MHz.
➢
Press the FREQ key and enter 100 MHz .
➢
Press the SPAN key and enter 0 Hz or
➢
Press the ZEROSPAN softkey.
➢
Press the BW key and enter 1 MHz .
3. Set the reference level of the R&S FSQ to 0 dBm (= level of the signal generator) and
RF attenuation to 10 dB for maximum sensitivity.
➢
Press the AMPT key and enter 0 dBm .
➢
Press the RF ATTEN MANUAL softkey and enter 10 dB .
4. Set the sweep time to 2 ms.
➢
Press the SWEEP key and enter 2 ms .
The R&S FSQ shows the GSM burst continuously across the display.
Frequency: 100 MHz
Level: 0 dBm
Modulation: GSM, one timeslot activated
Signal
generator
R&S FSQ