Teledyne ProEM Series, System Manual

Page: 83 / 162

Chapter 5 Operation 83
See Figure 5-20 .
Figure 5-20: Timing Diagram: Frame Transfer Mode, Exposure Time < Readout Time
In Frame Transfer mode when exposure time < readout time, the total time (TN) taken
to capture N frames is given by:
T
N
= (t
R
N) + t
exp
where:
• T
N
= Total time taken to capture a sequence of N frames;
• t
R
= readout time for one frame;
• N = total number of frames in a sequence;
• t
exp
= exposure time.
EXPOSE
(Effective)
EXPOSE
(Program’d)
READ OUT
SHUTTER
IMAGE SHIFT
EXPOSE (Effective) = High during the time when the CCD is collecting light.
EXPOSE (Program’d) = High during programmed exposure (as entered in the software). Can be used for gating the light source.
SHUTTER = High during “Shutter open comp + Exposure”. Follows Disabled Opened or Disabled Closed.
READ OUT = High during “Vertical Tr Digitization.”
IMAGE SHIFT = High while the image is being shifted under the mask. When low, the CCD is light-sensitive.
Open
Comp.
Exp #2
30 ms
Readout #1
30 ms
Exp #3
30 ms
Readout #2
30 ms
Readout #3
30 ms
Logic Out Signal Descriptions:
T = 100 ms
N
Exp #1
10 ms
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