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4.3.2 Trigger Menu – Advance Mode
The trigger menu is used for all acquisition. The trigger can be set to one of the
following selections
• Auto Trigger – When auto trigger is selected the DAQlink III unit starts
acquiring as soon as the start command is processed.
• Trigger on Time Break – When Trigger on Time Break is selected, the DAQlink
III unit receives and processes the start command from the computer, it then
waits for a signal on the Time break line before it starts to acquire data. The time
break circuit uses a differential input circuit. At least 3 volts should be applied
for reliable triggering. The unit can either trigger on a low going high voltage or
a high going low voltage. Must enter trigger level – Typically 3.3 volts is used
with a “hammer switch”.
• Trigger on Input Channel – When trigger on input channel is selected, the
DAQlink III unit receives and processes the start command from the computer, it
then waits for the threshold voltage on the selected channel to be exceeded.
• Trigger on “AUX Input” – The DAQlink III version 2 units have a second
auxiliary input for triggering on an external geophone. The gain on the auxiliary
input is set to x10, so a smaller signal can be used for triggering. Set the
threshold value for desired trigger level. Example if 0.01 volt triggering is
desired for geophone triggering, then enter Threshold = 0.01 volts. The auxiliary
Geophone input is wired to the 19 pin connector – pin M + and pin N -
• Trigger on PPS Pulse- In this mode; the DAQlink III uses the GPS time to trigger
the unit. The Timer data determines when the DAQlink III will trigger.
o Timer Start At time – enter time when first trigger should occur. If set to
00:00:00, the system waits for the next PPS pulse which satisfies the
Repeat Every Entry
o Repeat Every – Enter Time for unit to repeat trigger. An entry of
00:10:00 will cause the DAQlink III to trigger every 10 minutes. Auto
Start must be enabled for the unit to automatically repeat.
• Pre Trigger Delay – The DAQlink III will record and display data before the
trigger event. Enter the time for the pre trigger acquisition.
• Synchronize A-D – not used with DAQlink III units.
• Auto Start –When the auto start is enabled, the DAQlink III will automatically
start a new record after it has finished with the previous recording. This allows
the DAQlink III to record continuous data, when auto trigger is also enabled.
• Disabled – No internal Auto Start of DAQlink III is enabled – System must be
restarted from Vscope program.
• Without Start Command – With this enabled, the next time the DAQlink III is
powered on, the unit will automatically wait for the trigger condition and start
recording. When reconnected to the computer, the “Stop” command must be sent
to the DAQlink III to “Stop” recording before the computer will communicate
with the unit correctly.
• After Start Command – With this option enabled, the DAQlink III will not start
at power on. The DAQlink III waits for a Start command from the computer,
then it will start and repeat if the trigger and repeat according to the” trigger” and
“repeat every” settings.
• Timer settings – Require one “Valid” GPS position to start operation. After a
valid position has occurred the internal clock on the DAQlink III unit is used.
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