Seismic Source DAQlink III - GPS Trigger on PPS

96 User’s Manual
6.1.3 GPS Trigger on PPS
The DAQlink III unit can be set to trigger on the GPS PPS clock. First the trigger on PPS
pulse must be selected in the trigger selection, and then the Timer values must also be selected.
Timer Value:
Start At: The Start At time is used when the exact time of an event is to be used to
trigger the DAQlink III. Example: 01:00:00 will delay the start of acquisition until 01:00 GMT.
(This time is referenced to GPS time). An entry of 00:00:00 is used to allow the repeat every
entry to be used without an exact start time.
Repeat Every: The repeat every entry is used to determine when the next auto start will
occur. Example an entry of 00:10:00 will cause an auto start to occur the next time the GPS time
is on an even 10 minute boundary (10:00).
Example 1: It is 1:13 GST. The DAQlink III is set with the following:
Start Time = 00:00:00
Repeat Every = 00:10:00
The DAQlink III will start acquisition at the following times:
01:20 GST
01:30 GST
01:40 GST
etc..
Example 2: It is 1:13 GST. The DAQlink III is set with the following:
Start Time = 02:00:00
Repeat Every = 00:10:00
The DAQlink III will start acquisition at the following times:
02:00 GST
02:10 GST
Etc.