Instrument Function
R&S
®
SMF100A
239
Operating Manual 1167.2319.02 ─ 12
Remote command:
:SENSe<ch>[:POWer]:SWEep:TIME[:SENSor]:TRIGger:LEVel
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
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
Drop out Time - Power Analysis
Determines the minimum time for which the signal must be below (above) the power
level defined by "Level" and "Hysteresis" before triggering can occur again. It prevents
the trigger system from being activated too early if the trigger threshold is briefly under-
ranged or exceeded.
The dropout time parameter is useful when dealing with, for example, GSM signals
with several active slots. When measuring in synchronization with the signal, a trigger
event is to be produced at A, but not at B or C. As the RF power between the slots is
below the threshold defined by "Level" and "Hysteresis", the trigger hysteresis cannot
prevent triggering at B or at C. Select the dropout time parameter greater than the time
elapsed between points E and B and between F and C, but less than the time elapsed
between G and A. It makes sure that the trigger at A is effective.
As the mechanism associated with the dropout time parameter is reactivated whenever
the trigger threshold is crossed, unambiguous triggering can also be obtained for many
complex signals. By contrast, all triggering is suppressed during the hold-off time. I.e.
in the example, that although stable triggering conditions can be obtained with a suita-
ble hold-off time (regular triggering at the same point), it is not possible to set exclusive
triggering at A.
RF Level
