NED
XCM20125GIG
UME-0041-01
40
4.6.2
External Trigger Exposure Mode (Trigger Edge)
In External Trigger Exposure Mode (Trigger Edge),exposure time is set through
the registers, the scan period is set by the period of the external trigger signal
(Line Trigger), and the exposure start is set by the rising edge of the external
trigger signal. The possible range of exposure time, and the relationship between
the timing of exposure and readout is explained below.
As with free run exposure mode, the minimum scan cycle changes depending on
the image format.
Table 4-6-2
External Trigger Exposure Mode (Trigger Edge)
Item
Symbol
Less than central
1024 pixels
All other cases
ExposureTimeCounter
-
134
～
32767
268
～
32767
Programmable exposure setting time
P
8.6
～
4194.2
17.2
～
4194.2
Free run scan rate
S
10.3
～
4196.7
18.8
～
4196.7
Trigger pulse High ime
T1
≧
0.1
Trigger pulse Low time
T2
≧
0.1
Trigger pulse cycle
T3
≧
S
(unit
: μs)
①
②
③
External trigger
signal input
(Line Trigger)
T1
T2
T3
Exposure
①
②
③
P
S
Figure
4-6-2 External Trigger Exposure Mode (Trigger Edge)
