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Measurements and results
R&S
®
FSVA3000/ R&S
®
FSV3000
156
User Manual 1178.8520.02 ─ 08
h) By turning the rotary knob clockwise, move the vertical line "S2" to the end of
the burst.
i)
Note down the power result for the burst, indicated by the "TD Pow RMS" result
in the marker table.
9. Measure the power during the deactivation phase of the burst by switching the trig-
ger slope to "Falling" ([TRIG] > "Trigger/ Gate Config").
The R&S
FSV/A initiates triggering in response to the falling edge of the burst. This
shifts the burst to the left-hand side of the measurement diagram. The power is
measured in the deactivation phase.
Figure 5-19: Measurement of the signal-to-noise ratio of a GSM burst signal in zero span
10. Note down the power result for the measured noise, indicated by the "TD Pow
RMS" result in the marker table.
Subtract the measured noise power from the burst power to obtain the signal-to-
noise ratio of the burst signal.
5.3
Channel power and adjacent-channel power (ACLR)
measurement
Measuring the power in channels adjacent to the carrier or transmission channel is
useful to detect interference. The results are displayed as a bar chart for the individual
channels.
About channel power measurements
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Channel power and adjacent-channel power (ACLR) measurement