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I2679-4.0 en
Figure 10.10: Pulse detector
A
Trigger
B
Width
Figure 10.10: In diagrams A and B the pulse detection is depicted. In diagram
A, when the trigger level is crossed, the signal remains above the trigger level
for a time interval larger than pulse width W. In diagram B there is a situation
in which the signal returns through the trigger level within pulse width W. A
trigger is generated on a "small" pulse.
In diagrams C and D the opposite situation is depicted: pulse reject. Now "small"
pulses are not recognized as trigger condition, while a wider pulse generates
a trigger.
The pulse detector can be used for both trigger levels. Combined with a
hysteresis setting, the pulse detector is less sensitive to noise on the signal.
10.4.3
Holdoff
The trigger holdoff feature is used to disable the trigger detector for a period of
time after a trigger condition was met.
This can be used to generate only one trigger on a slowly decaying repetitive
signal, or eliminate the effect of after-ringing. Using a 16-bit counter triggering
can be disabled for as long as 6.5535 seconds when sampling at 10 kS/s.
GEN5i
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Troubleshooting
