LYNX Manual RA02
2.6
STROBE OUTPUT
2.6.1 Strobe
Positioning
The strobe output is used to synchronize an external light source with the
camera timing, and thus to maximize the camera efficiency in low light level
conditions. The optimal strobe signal position is achieved by the positioning
of a short pulse, STROBE, (duration 200 µs) with respect to the vertical
transfer pulse VCCD - Figure 2.41. The strobe pulse can be positioned
within the entire frame timing period with a precision 10 microseconds –
refer to the ‘ssp’ command.
VCCD
STROBE
Frame Time
Strobe Position
Figure 2.41 - Strobe Pulse Positioning
CAUTION NOTE
1.
The strobe output can be enabled in all camera modes.
2.
Positioning the strobe signal outside the frame window will
result in error – refer to Status LED section.
2.6.2 Strobe
Electrical Connectivity
The strobe output is optically isolated from the rest of the camera hardware.
To increase the output current to about 40 mA, the output is buffered with a
discrete transistor 2N3904 - Figure 2.42. The output signals “+ STROBE”
and “– STROBE” are used to connect to an external strobe device. The
actual connection depends on the particular implementation. Figure 2.43
shows a sample wiring diagram, which generates a 5 V strobe pulse between
“+ STROBE” and “– STROBE”. The first one (left) generates an active
LOW strobe pulse, and the second one (right) generates an active HIGH
strobe pulse.
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