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82 MicroMAX System User Manual Version 6.C
Shutter
External Sync
(negative polarity shown)
t
exp
t
w1
50ns min.pulse between frames
t
R
t
R
t
R
t
R
actual exposure time
cleans
acquisition
NOT SCAN
Figure 37. Overlapped Mode where t
w1
+ t
exp
+ t
c
< t
R
Figure 38 shows the case where the programmed exposure time is greater than
the time required to read out the storage half of the array, that is, where t
w1
+ t
exp
+ t
c
> t
R
. In this case, the programmed exposure time will dominate in
determining the actual exposure time. In the situation depicted in
Figure 38, the
External Sy
nc pulse arrives during the readout. As always, the External Sync
pulse must be detected before the next readout can occur. However, there is no
requirement as to when it must be applied or even that it be periodic. The timing
of the External Sync pulse is entirely at the user’s discretion. In
Figure 39, the
E
xternal Sync pulse is shown arriving after the read. Detection of the External
Sync pulse enables a new readout to occur on completion t
exp
+ t
c
.
External Sync
(negative polarity shown)
t
exp
t
w1
t
R
t
c
cleans
acquisition
t
R
t
R
t
R
t
R
actual exposure time
Shutter
NOT SCAN
Figure 38. Overlapped Mode where t
w1
+ t
exp
+ t
c
> t
R
External Sync
(negative polarity shown)
t
w1
t
c
t
exp
cleans
acquisition
t
R
t
R
t
R
t
R
actual exposure time
Shutter
NOT SCAN
Figure 39. Overlapped Mode where Pulse arrives after Readout