IPX Manual RB01
2.6
STROBE OUTPUT
2.6.1 Strobe
Positioning
he strobe output is used to synchronize an external light source with the
amera timing, and thus to maximize the camera efficiency in low light level
onditions. The optimal strobe signal position is achieved by the positioning
f a short pulse, STROBE, (duration 200 µs) with respect to the vertical
ansfer pulse VCCD - Figure 2.33. The strobe pulse can be positioned
ithin the entire frame period with a precision 1 line (4 lines for IPX-
M48).
T
c
c
o
tr
w
1
VCCD
STROBE
Frame Time
Strobe Position
Figure 2.33 - 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 2.34. The output signals “+ STROBE”
and “– STROBE” are used to connect to an external strobe device. The
actual connection depends on the particular implementation. Figure 2.35
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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