Determining Average Or Max/Min Values - R&S FSV-K8 Operating Manual

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R&S FSV-K8

2.8 Determining Average or Max/Min Values

These functions are very useful in order to obtain more stable results or to find spora-
dic spurious signals not included in every burst. In many cases the RF Test Specifica-
tion 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 aver-
aging 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 align-
ment of a DUT. In single sweep mode and with the sweep count set to 10, the spec-
trum analyzer evaluates 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 measure-
ment 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.
Impact of the sweep count on the measurement results
Trace Mode
Clear Write
AVG, MaxHold,
MinHold
The functions described above differ from the detector functions of the instrument:
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Detectors combine the measurement data obtained by oversampling to one mea-
surement point on the screen. The kind of combination (Max Peak, Min Peak,
Average, RMS) can be selected.
Operating Manual 1176.7610.02 ─ 02
Introduction to Bluetooth Measurements (K8)
Continuous Sweep
All measurement results (min., max.,
average) are updated with every sweep.
The corresponding values are calculated
based on the current curve.
All measurement results (min., max.,
average) are updated with every sweep.
The corresponding values are calculated
based on the current curve.
The trace is the continuous average
value (AVG) or the extreme value (Max-
Hold, MinHold) since the start of the
measurement.

Determining Average or Max/Min Values

Single Sweep & Sweep Count
Starts a measurement with n sweeps (n =
sweep count).
All measurement results (min., max.,
average) are calculated based on these n
sweeps.
Starts a measurement with n sweeps (n =
sweep count).
n defines the number of sweeps that are
taken into account for the trace math
functions (AVG, MaxHold, MinHold). The
n sweeps result in one trace and the
measurement results (Min, Max, Aver-
age) are calculated based on this sum-
marized trace.
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