Improving level performance
R&S
®
SMA100B
273User Manual 1178.3834.02 ─ 09
Level - Power Analysis
Sets the trigger threshold. This setting is also possible by the trigger marker on the left
side of the diagram.
Remote command:
:SENSe<ch>[:POWer]:SWEep:TIME[:SENSor]:TRIGger:LEVel on page 511
Slope - Power Analysis
Sets the polarity of the active slope of the trigger signals.
"Positive"
The rising edge of a trigger signal is active.
"Negative"
The falling edge of a trigger signal is active.
Remote command:
:SENSe<ch>[:POWer]:SWEep:TIME[:SENSor]:TRIGger:SLOPe on page 511
Hysteresis - Power Analysis
Sets the hysteresis of the internal trigger threshold. Hysteresis is the magnitude (in dB)
the trigger signal level must drop below the trigger threshold (positive trigger slope)
before triggering can occur again.
Remote command:
:SENSe<ch>[:POWer]:SWEep:TIME[:SENSor]:TRIGger:HYSTeresis
on page 510
Drop out Time - Power Analysis
Determines the minimum time for which the signal must be below (above) the power
level defined by Level - Power Analysis and Hysteresis - Power Analysis before trigger-
ing can occur again. This setting prevents the trigger system from being activated too
early if the trigger threshold is temporarily underranged or exceeded.
The dropout time parameter is useful when dealing with, for example, GSM signals
with several active slots. When measuring in sync with the signal, a trigger event must
be generated at A, but not at B or C. As the RF power between the slots is below the
threshold defined by Level - Power Analysis and Hysteresis - Power Analysis, the trig-
ger hysteresis cannot prevent triggering at B or at C. To achieve triggering at A, the
value of the drop out time must be greater than the time interval between E and B and
between F and C. But it must be lower than the time that elapses between G and A.
Using power sensors
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