Rohde & Schwarz 1094.0006.50, Operating Manual

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Module Test CTS55
1094.0006.55 7.10 E-5
7.5.2 Running the IQ Spectrum measurement
IQ Spectrum Menu (with markers) IQ Spectrum Menu (without markers)
Entering the "IQ Spectrum" menu via the "Module Test" menu allows the IQ Spectrum measurement to
be made. The mobile should be put into its special test mode, in particular the frequency of the mobile’s
transmitted signal needs to be specified. When the mobile has been attached to the CTS and the CTS
has been configured to use the same parameters as the mobile’s transmitted signal, the IQ Spectrum
graph should appear.
While the CTS is searching for the mobile’s signal a small symbol (AR, standing for Auto Ranging) will
appear at the top of the menu. This symbol will disappear when the signal has been found and
measurements are being made.
The "RF Generator" menu can be selected by pressing the "RF Gen" softkey.
Exp. Power
Enter here the power that you expect to be received by the CTS. This value aids the system’s search
for the signal.
Freq/RF Chan
The receive frequency can be set either as a channel number or as a frequency (in steps of 0.2 MHz).
The selection of which to use can be set up in the "Config. IQ Spectrum" menu. See section 7.7 for
information on the frequency ranges allowed.
Marker Toggle
To toggle between markers in left/middle position and markers in middle/right position.
7.5.3 The Measurement Results
Ref. Pow .
The absolute (reference) power level of the top (0 dB) of the IQ Spectrum measurement graph.
M2, M1 and M3
These values show the frequencies of the markers and the absolute measured power levels at the
markers.
1-2, 2-3 and 1-3
The calculated differences between the various measured power levels at the markers.