Vernier DataMate Guidebook - Manual (Page 23)

DataMate Guidebook 21
3. To change the type of triggering, select CHANGE TRIGGERING . In the
example shown, there are two types of triggering:
•
LabPro will trigger the start of data collection based on a change in
the data being collected. (This is called threshold triggering.)
•
For MANUAL TRIGGER , the LabPro will start collecting data when
the START/STOP button on LabPro is pressed.
•
If you choose NONE , no special triggering will be set.
4. Press the number beside the type of triggering you want. If you select NONE ,
you will return to the ADVANCED TIME SETTINGS screen.
If you select
MANUAL TRIGGER , the triggering option is changed and you
will return to the ADVANCED TIME SETTINGS screen.
If you choose to trigger on a channel, DataMate asks you to choose the
trigger type.
•
INCREASING means that data collection will not start until the
sensor readings (such as light intensity or temperature) increase
through the selected threshold (see Step 6).
•
DECREASING means that data collection will not start until sensor
readings decrease through the selected threshold (see Step 6).
5. Press the number beside the trigger type you want.
6.
Key in the number (the threshold) at which you want data collection to
begin and press
ENTER
. (Put in a threshold value in the units of the
sensor you are using such as
°C for temperature or Newtons for force.)
When the values of the data being collected reach this value, LabPro
will begin storing data.
7. Key in the number (percent) of data you want the LabPro to prestore
and press
ENTER
. Prestore is the amount of data collected before the
threshold was reached that you want to keep (10 percent, 20 percent,
and so on). From the time the experiment begins until the threshold is
reached, LabPro collects data in a buffer. When the threshold is
reached, LabPro begins storing the data it has collected and discards the
data it collected before the threshold was reached unless a prestore
value is entered. The
ADVANCED TIME SETTINGS screen appears.
When Manual Trigger is selected, a set of instructions will be given after
you select
START . After selecting START , you can leave DataMate. Then
you can disconnect the calculator from the LabPro unit and use LabPro for
remote data collection. Data collection will begin when the Start/Stop
button on LabPro is pressed. To download data to the calculator after
remote data collection, reconnect the LabPro to the calculator and restart
DataMate. Follow the instructions on screen.