ABEM Terraloc Pro 2
48
Figure 42 The Acquisition Setup Dialog; Trig tab selected
Setting
Description
Trig input
mode
-
Selects trig input source, and its mode
The following modes are available:
Name
Description
Analog
When using the trigger input connector, the
instrument is triggered when the signal exceeds the
trig input level on the analog trig input. Select
Analog when you use a standard trigger geophone or
a trigger coil. If you use Analog triggering, you
should check and/or set the trig input level.
Make/Break
The instrument is triggered when a trigger circuit
connected to the trigger input connector is closed
(make) or opened (break). The trigger circuit can for
example be a twisted pair of insulated wires inserted
in a dynamite charge. The wires are then shorted
when the charge explodes (make switch). A break
switch can be a single wire, which has been wound a
few turns around the charge and the explosion cuts
the wire (break switch). The instrument detects the
state change from opened to closed (make), or from
closed to opened (break), depending on the state at
the time of arm. Set Trig Input Level to a low value
to avoid inadvertent triggering by spurious signals.
TTL
Rising Edge
The instrument is triggered when the TTL signal on
the digital trig input goes from low to high
