Chapter 5 Functions of the Front Panel of VSA
RIGOL
RSA3000E User Guide
5-19
amplitude of the current mask point and the current reference level. If you
change the parameter state after completing the mask setup, the amplitude
of the mask should change with the state to keep the mask points to be in
the same position relative to the current reference level of the instrument.
(3)
Trigger Mask
Sets the currently effective trigger mask.
Upper: only sets the upper trigger mask to be effective.
Lower: only sets the lower trigger mask to be effective.
Both: sets both the upper and lower trigger masks to be effective.
Note: When "Upper" is selected under Mask Type, the trigger mask is, by
default, the upper mask; when "Lower" is selected under Mask Type, the
trigger mask is, by default, the lower mask; when "Both" is selected under
Mask Type, the trigger mask is, by default, the one before switching the
mask type.
(4)
Trigger Criteria
Sets the condition that will cause the FMT trigger to occur. Both upper and
lower masks use the same trigger criteria, and the trigger will occur when
either mask meets the trigger criteria.
Enter: Two states are required to initiate a trigger event. The signal
must be outside the mask and then passes into the mask. The trigger
event occurs when the first non-violating waveform is detected.
Leave: Two states are required to initiate a trigger event. The signal
must be inside the mask and then passes out of the mask. The trigger
event occurs when the first non-violating waveform is detected.
Inside: Only one state is required to initiate a trigger event. The signal
has at least one data point inside (above) the mask. The trigger event
occurs when the instrument detects the first signal with a point
violating the mask.
Outside: Only one state change is required to initiate a trigger event.
The signal has all data points outside (below) the mask. The trigger
event occurs when the instrument has detected the first spectral
waveform that is completely outside (below) the mask.
Enter-Leave: Three states are required to initiate a trigger event. The
signal starts outside the mask and then passes into the mask. Next, the
signal must pass outside the mask. The trigger event occurs at the
second transition where the signal passes back out of the mask.
Leave-Enter: Three states are required to initiate a trigger event. The
signal starts inside the mask and then passes out of the mask. Next,
the signal must pass into the mask. The trigger event occurs at the
second transition where the signal passes back into the mask.
