Compact Scientific Digital Cameras Chapter 4: Operation
Page 20 ITN004347-D02
Figure 11 Timing Diagram – Bulb Mode
4.2.1. Camera-Specific Timing Considerations
Due to the general operation of our Zelux CMOS sensor cameras, as well as typical system propagation
delays, the timing relationships shown above are subject to the following considerations:
1) The delay from the external trigger to the start of the exposure and strobe signals is typically 12 µs to
15.5 µs for all triggered modes (standard and PDX/Bulb).
2) For PDX/Bulb mode triggered exposures, in addition to the 12 µs to 15.5 µs delay at the start of the
exposure, there is also a fixed exposure time period
1
AFTER the falling edge of the external trigger.
This is inherent in the sensor operation.
It is important to note that the Strobe_Out signal includes the additional fixed exposure time period and
therefore is a better representation of the actual exposure time. Our suggestion is to use the Strobe_Out
signal to measure your exposure time and adjust your PDX mode trigger pulse accordingly.
Note 1 – The fixed exposure time period for the CS165 models is 14.26 µs.
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