Rohde & Schwarz R&S FSP Series, Operating Manual

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Operating Manual 1164.4556.12 - 06 2.41
R&S FSP Getting Started
Measurements on Modulated Signals
2.5.3.5 Measurement Example 5 – Measuring adjacent channel power of a W-CDMA
uplink signal
Test setup:
Settings on the signal generator (e.g. R&S SMIQ):
Measurement with the R&S FSP:
1. Set the R&S FSP to its default state.
➢
Press the PRESET key.
The R&S FSP is in its default state.
2. Set the center frequency to 1950 MHz.
➢
Press the FREQ key and enter 1950 MHz .
3. Switch on the ACP measurement for W-CDMA.
➢
Press the MEAS key.
➢
Press the CHAN PWR ACP ! softkey.
➢
Press the CP/ACP STANDARD softkey.
➢
From the list of standards, select W-CDMA 3GPP REV using the spinwheel or
the cursor down key below the spinwheel and press ENTER .
The R&S FSP sets the channel configuration to the 3GPP W-CDMA standard
for mobiles with two adjacent channels above and below the transmit channel.
The frequency span, the resolution and video bandwidth and the detector are
automatically set to the correct values. The spectrum is displayed in the upper
part of the screen and the channel power, the level ratios of the adjacent
channel powers and the channel configuration in the lower part of the screen.
The individual channels are displayed as vertical lines on the graph.
4. Set the optimum reference level and the RF attenuation for the applied
signal level.
➢
Press the ADJUST REF LEVEL softkey.
The R&S FSP sets the optimum RF attenuation and the reference level for the
power in the transmission channel to obtain the maximum dynamic range. The
following figure shows the result of the measurement:
Frequency: 1950 MHz
Level: 4 dBm
Modulation: 3 GPP W-CDMA Reverse Link
Signal
generator
FSP