External Trigger Events; Figure 3-30 External Trigger Event - Omega OM-DAQXL-1 Series User Manual

3
Standalone Operation

External Trigger Events

This option allows the external trigger input to be used as a start and stop
trigger. The external trigger input can accept signals from 0 to 24 Vdc. The input
threshold voltage is ≥ 2.5 Vdc for a logic high level and ≤ 1.5 Vdc for a logic low
level. There are four detection options which determine when an external trigger
event is generated.
1
1. External Trigger Detection Options
2. Repeat Trigger Events
3-25
2

Figure 3-30 External Trigger Event

These options determine when a logging session is triggered by the external
trigger input. For the high and low options, a trigger event is generated
immediately if the trigger condition is met when the Log Data button is
pressed. For the rising and falling edge options, the corresponding edge
transition must be seen on the external trigger input before a logging session
will begin.
If repeat trigger events are enabled the device will automatically re-arm
itself after the logging session ends. A stop trigger event must be configured
for this to occur.