SCHOTT VisiLED Serie Conseils D'utilisation page 56

Trigger mode
Please note
54 | VisiLED-Serie
In order to activate/deactivate the strobe mode of the second LED unit this
must first be selected using the unit selector key (1).
When the computer is controlling the MC 1500 the strobe cycle duration
(1=/strobe frequency) and the strobe pulse duration can be set to the exact
μs and the strobe intensity can be adjusted by the exact percentage for each
VisiLED unit. If certain ancillary conditions are observed (pulse duration
< 10 ms, cycle duration > 10 x pulse duration) an overdrive of the strobe inten-
sity up to 300 % of the continuous light is possible! Otherwise the maximum
intensity is 100 %.
In trigger mode both VisiLED illuminations are initially switched off, but the
VisiLED system always emits a light pulse after receiving an external control
signal (trigger signal).
In this way, for example, an individual pulse is always released from an ex ternal
Machine Vision system whenever an image of a specimen has to be recorded.
The trigger mode is activated when the strobe key (9) is pressed while key (10)
is held down. The LED display (4) rolls up and down to indicate trigger mode
has been activated. The trigger mode is deactivated by pressing the key com-
bination (10) + (9) again.
The light pulse can be emitted with a defined time delay after receiving the
trigger signal. This time delay can be set using the keys (5) when trigger mode
is active. The "up" key increases the time delay; the "down" decreases it.
The initial setting of the MC 1500 is selected so that the delay can be set at
1 second and reduced to 0. The delay can be increased to up to 16 seconds by
computer.
The activation/deactivation of the trigger mode and the delay time setting
automatically affect both LED illuminations (A/B).
The intensity and pulse duration of the emitted light pulse cannot be
changed using the controller. However, when the computer is controlling
the MC 1500 there is the possibility of individually adjusting both values.
After the trigger signal has been received no additional trigger signal can be
accepted until the light pulse has been emitted.
After the light pulse has been emitted, until an octuple pulse duration has
elapsed, no further light pulse can be emitted. This protects the LEDs.
The light pulse is triggered by bypassing both contacts of the flash
connection (14) on the back of the controller (3.5 mm jack socket). The
tip of the connector is positive.
The trigger signal should last more than 5 μs.