MEAS Key - Receiver R&S ESCI
1166.6004.12 4.34 E-2
Automatic Final Measurement with THRESHOLD SCAN
The interference spectrum is first pre-analyzed in a fast prescan to optimize the duration of the
measurement. If the measured level exceeds a limit line, or violates a margin defined for this line, the
time-consuming final measurement is performed. The final measurement is, therefore, carried out only
for a reduced number of frequencies of interest. For this measurement, each scan trace to be taken into
account has to be assigned a limit line, and the limit line and the limit check function have to be
activated in the LIMIT LINE menu.
The prescan is interrupted immediately for each final measurement to be performed, i.e. the final
measurement immediately follows the prescan measurement. In the case of drifting or fluctuating
interferers, this increases the probability that the signal of interest will be reliably detected in the final
measurement.
If the narrowband/broadband discrimination function is activated (NB/BB DISCR softkey), the receiver
automatically selects the detector to use in the final measurement. To this end, the receiver compares
the positive and the negative peak value obtained in the prescan. If the difference between the two
values exceeds a user-selected threshold, a broadband interferer is assumed, and the quasi-peak
detector is used in the final measurement. If the difference falls below this threshold, a narrowband
interferer is assumed, and the average detector is used in the final measurement. (The receiver
automatically determines the positive and the negative peak value during the prescan.)
The value obtained in the final measurement is added to the peak list, where it replaces the result of the
prescan. With NO OF PEAKS, the maximum number of peak values to be included in the list can be
defined. If this number is attained, the prescan will be continued, but no further final measurements will
be performed.
The THRESHOLD SCAN submenu is called from the RECEIVER main menu:
DETECTOR
RECEIVER
FREQUENCY
MEAS TIME
RECEIVER
DEMOD
RUN
SCAN
FINAL
MEAS
THRESHOLD
SCAN
EDIT PEAK
LIST
NO OF
PEAKS
FINAL
MEAS TIME
MARGIN
NB/BB
DISCR
RUN
SCAN
THRESHOLD
ON OFF
INTER
ACTIVE
AUTOMATIC
FINAL
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