R&S FSL Bluetooth Measurements (Option K8)
1300.2519.12 2.43 E-11
Sampling times before timing offset correction Sampling times after timing offset correction
Fig. 2-31 Operation of the timing offset correction
Advantages of the timing offset correction:
No jitter with low sampling rates
With one sample per zero, the trespassing point is always a sample in the middle of the bit length.
Therefore the maximum values in the frequency deviation of 0101 bit patterns can be detected
precisely also with low sampling rates.
The immunity to interference when determining the data bits is improved.
Higher suppression of the distortion during peak detection.
Determining Average or Max/Min Values
These functions are very useful in order to obtain more stable results or to find sporadic spurious
signals not included in every burst. In many cases the RF Test Specification defines measurements
over a 10 burst period.
The number of measurements can be selected using sweep count function, thus adapting the
measurement to the individual requirements.
In single sweep mode, the calculation of average or maximum / minimum values is performed over a
well–defined number of sweeps (= sweep count).
Continuous sweep mode yields continuous averaging and calculation of maximum / minimum values
over the whole measurement time.
Modulation measurements
They are performed in the Clear Write trace mode.
In continuous sweep mode, a "live" display is obtained, which allows e.g. an instant view of changes
during alignment of a DUT.
In single sweep mode and with the sweep count set to 10, the spectrum analyzer will evaluate 10 bursts
as required by the RF Test Specification. This means that a result is obtained after exactly 10 bursts.
Power measurements
They are performed in the Maxhold trace mode in relation with the defined measurement time. The
measurement time is selected in order to make sure that always one complete burst is acquired. In this
case, several sweeps are combined to one trace before this result trace is evaluated.
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