Fourier TriLink User Manual page 72

5. Pick the triggering sensor from the Based on sensor pick list
6. Pick one of the following from the Type pick list:
•
None - Trigger is disabled
•
Above level - Start logging only once the measured value is HIGHER than the
trigger level.
•
Below level - Start logging only once the measured value is LOWER than the
trigger level.
Note: The trigger acts on analog measurements only (not on the
distance sensor). The trigger condition must be fulfilled for at least
300µS.
•
Control Level - The Control Level trigger allows you to create an automatic
sense and control system. This means that you can connect a sensor
measuring a certain phenomenon (for example, temperature) and connect a
device that will start operating when the recorded data from the sensor falls
above or below a pre-defined threshold (for example, a fan that will start
operating when the temperature measured by the sensor rises above 30°C).
This function requires the use of a splitter cable and a control sensor. The
cable divides each input into a sensor cable and a controller cable. After
setting the control level and starting the data logging process, the sensor will
sample and record the data as usual, but when the measurement from the
sensor rises above the predetermined threshold value, the controller cable will
send a pulse of 5V to the control sensor, and will continue to do so until the
sensor measures a value below the threshold level. When receiving the 5V
pulse, the control sensor will close/open a relay capable of switching
110/220V to any load.
•
Time delay - This trigger type enables you to set a timer that will start the
logging after a predetermined amount of time. After setting the trigger to Timer
Delay, click the down arrow on the Level combo-box, and select from the 17
different time options. The timer will start its countdown when you click RUN,
and the actual recording will start once the countdown has ended.
7. Pick the trigger level in the Level pick list
8. Tap OK
Chapter 3 Working with Pocket PC 71