Guralp Systems CMG-6TD - Manual (Page 91)

CMG-6TD Command-line interface
7.5.8 POST­TRIG
Syntax: time POST­TRIG
Sets the post-trigger recording time. time is the number of seconds of data to
output after a trigger condition lapses. If an event persists for some time, all
triggering components must fall below the threshold before the trigger
condition will lapse; only then will the post-trigger period begin.
7.5.9 TRIGGERIN
Syntax: TRIGGERIN ENABLE | TRIGGERIN DISABLE
Enables or disables external trigger input, in instruments equipped with this
option.
Enabling external trigger input allows you to trigger the 6TD from an external
logic level supplied through its digital output port. This voltage can be
between 5 and 10 V supplied between the Trigger In pin and signal ground. If
the 6TD is triggered externally, it will behave exactly as if it had generated the
trigger itself.
7.5.10 TRIGGEROUT
Syntax: TRIGGEROUT ENABLE | TRIGGEROUT DISABLE
Enables or disables external trigger output, in instruments equipped with this
option.
Enabling external trigger output allows you to trigger other equipment
through a relay contained within the 6TD whenever it triggers. The 6TD's
digital output port contains two pins (Trigger out - common and Trigger out -
normally-open) which are connected when it triggers. In particular, you can
connect a second digitiser with TRIGGERIN ENABLE in effect, in which case
triggered data from both instruments will be transmitted whenever the 6TD
triggers.
If a 6TD has both TRIGGERIN ENABLE and TRIGGEROUT ENABLE in effect,
only triggers which the 6TD itself has generated will be output. Triggers
received through the Trigger in port will cause the 6TD to output triggered
streams, but will not be passed on to other digitisers.
7.6 Calibration
7.6.1 SINEWAVE
Syntax: component freq­or­period unit SINEWAVE
Instructs the 6TD to inject a sine-wave calibration signal, starting on the zero
crossing.
MAN-T60-0002 91 Issue F - February 2014