QUAD-4Track User’s Manual Revision 2.1 27
Trigger Level Setting
If internal trigger is used, then the trigger level is set to a value that is less that the lowest
expected energy. For example, energies from 1.8mJ to 15mJ are expected. Select the
20mJ range, and set the trigger level to less than 1.8 / 20 x 100 = 9 %. You may have to
experiment with the trigger level until the trigger LED illuminates.
Trigger Source Setting
The trigger source can be set to internal or external. Internal trigger generates a trigger
event whenever the pulse exceeds the trigger level. External triggering generates a trigger
even whenever a TTL pulse is received on the external trigger input. A measurement is
taken when a trigger even is generated, so with external triggering missing or runt pulses
can be discovered.
Trigger Polarity (Slope) Setting
In external trigger mode, the rising or falling edge of the TTL pulse may be selected as
the trigger event. If the trigger is set to external, with edge polarity, then the temporal
relationship between the edge of the trigger and the rising edge of the pulse must be in a
window not to exceed ±10μs.
Autoset
This button calls the Autoset VI. This VI attempts to find the best range and trigger level
for the signal being measured. The flow is:
1. Set the trigger source to internal.
2. Set trigger level to 7%
4. Set the Range to Top Range.
5. Test for triggering.
If no triggers are present, the VI reduces the range to the next lowest and tests for
triggering. It repeats this process until the lowest range is reached. If no triggers are
present, it then reduces the trigger level 1% at a time until either triggering occurs or the
minimum trigger level is reached.
When a trigger is found, the VI returns the discovered setup to the Instrument Controls
Display.
Measuring Data
Once range and trigger setting have been made, and the trigger LED is illuminated, then
data can be acquired by pressing the Acquire Data button
(37 pages)
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