6
External and Internal Trigger Mode
The flash rate of the PowerStrobe can be controlled by an external trigger
signal, or the flash rate Up & Down control keys.
External mode
When the external trigger connector is installed, the internal rate control is
disabled and the PowerStrobe will flash synchronously with each external
trigger signal.
The PowerStrobe provides two external trigger input channels which are fac-
tory set for accepting the following signal types.
V - C Option: Video & Contact Closure
• Video: 1v p-p unterminated, triggers on 50Hz or 60Hz vertical sync.
• Contact: Contact closure or open collector, > 8VDC @ 10mA rating
V - P Option: Video & Pulse
• Video: 1v p-p unterminated, triggers on 50Hz or 60Hz vertical sync.
• Pulse: +2.5V pk minimum, > 100µsec pulse width.
Internal mode
In internal mode the flash rate is set by using the Up & Down rate control
keys over the range of 30 Flashes per Minutes (F/M) to 18000 F/M.
Pressing and releasing the Up & Down keys changes the flash rate in
single steps. By pressing and holding the Up & Down keys for longer
than 1 second, the flash rate is scanned at an approximate speed equal to
10F/S per second.
