Inside the DM24
7.4.1 Overview
The digitiser or digital instrument has two internal components related to triggering.
•
The trigger generator runs the triggering algorithm and determines whether a
trigger has occurred. If external trigger
output
has been enabled, the trigger
generator also operates a relay which connects the two
Trigger Out
pins of the
DATA OUT
port. These are normally pins E and F.
The
Trigger Out
pins are only connected whilst the
generator
is active. This
does not include any pre-trigger or post-trigger period, which is dealt with by
the trigger receiver. A trigger signal may be as short as one second.
•
The trigger receiver acts upon trigger signals: normally, by recording
additional data streams. The receiver will always start recording if the trigger
generator produces a signal. If external trigger
input
has been enabled, the
receiver will also act on a logic signal received on the
Trigger In
pin of the
DATA OUT
port.
Any signal b3 and +30 V referenced to power ground (pin A) can be
used. The instrument's own power supply (pin B) could be connected via a
relay to supply this signal, for example.
The
Trigger Out
pins are
not
connected if you provide a
Trigger In
voltage. The
instrument must trigger
itself
for the relay to switch. This arrangement prevents
any trigger loops from occurring.
The diagrams on this page show the additional connections you will need to make.
Pins A and B, and the data pins, should be connected to your power and data systems
as normal.
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Issue U - December, 2021
