Technical data

Chapter 19 571
W-CDMA or W-CDMA (with HSDPA) Analyzer
Interpretation of Measurement Results
W-CDMA or W-CDMA (with HSDPA)
Analyzer
Interpretation of Measurement Results
This section contains expected result values and possible causes of error if the
expected results are not met.
Freq (Frequency)
If you are in the channel mode, verify that the correct channelization and channel
number are set.
Freq Error (Frequency Error)
The frequency error of the analyzer should be <1 kHz. If it is not, check to ensure
that the test set is performing a correct measurement. You can do this by reviewing
the frequency reference settings for the test set (refer to “Selecting a Reference” on
page 537).
Ensure that these settings are correct, and that the test set shows reference lock.
Lastly, make sure the test set has been powered on, and has been locked for at least
15 minutes.
If the error is still occurring after performing the above procedures, you will need to
check the Base Station equipment for a source of the error. You can also verify that
the base station is malfunctioning by turning off its modulation hardware and
performing a frequency measurement on the Base Station carrier signal in the
spectrum analyzer mode of the test set (refer to “Performing a Basic Spectrum
Analyzer Measurement” on page 415).
You can use the
Frequency Limits setting to make your analyzer indicate
automatically whether or not a signal has exceeded the pre-defined limits you set.
Scramble Code
If the Scrambling Code is not as expected, it could be due to an incorrect Base
Station setting or to incorrect positioning of the test set. If the correct Scrambling
code cannot be located, check the base station settings.
Noise Floor
An unexpectedly high noise floor could be due to interfering signals.
If you have not already done so, you can reduce the noise floor by activating the IF
Equalizer (See “Setting the IF Equalizer” on page 565.)