JAI TMC-4200GE User Manual download pdf (Page 76)

Page 64

TM-4200GE Hardware

Operation

9.3.1 Preset Shutter

TABLE 8. Electronic Preset Shutter

9.3.2 Programmable Exposure-Continuous Mode

The exposure time of TM/TMC-4200CL can be specified from one video line to a maximum of one

frame using the serial communication commands in the Continuous Mode. There is overhead where the

specified exposure time is n video lines, making the real exposure time equal to

When n=0, the exposure time is the minimum exposure time. It is equal to:

In this mode the maximum exposure time is equal to the setting for one frame. If the user specified

exposure time is longer than the time allowed for one frame, it will be ignored by the camera.

9.3.3 Asynchronous No Shutter Mode

In Asynchronous No Shutter Mode, applying the external trigger starts a camera scan reset. The camera

finishes the line it is scanning and scans an additional 9 video lines, this charge is sent to the horizontal

Because the external trigger is randomly applied, the new image charge may overlap with the previous

image. To prevent an existing charge accumulation from interfering with a new image, most users set up

the application in a dark area and depend on a strobe light for illumination. From the time the external

trigger activates until the transfer gate turns off, about 9.5 video lines are available for integration; if

everything is properly configured, the strobe flashes during this time.

Shutter Speed

Dual Tap Single Tap

Continuous

Mode (sec)

Async Mode

(sec)

Continuous

Mode (sec)

Async Mode

(sec)

0 No shutter No shutter No shutter No shutter

1 1/60 1/16000 1/35 1/9000

2 1/125 1/8000 1/70 1/4500

3 1/250 1/4000 1/140 1/2250

4 1/500 1/2000 1/280 1/1120

5 1/1000 1/1000 1/560 1/560

6 1/2000 1/500 1/1120 1/280

7 1/4000 1/250 1/2250 1/140

8 1/8000 1/125 1/4500 1/70

9 1/16000 PWC 1/9000 PWC

Exposure Time=

{

(n+1) *32.5 μs+25.6μs

(n+1) *58.1 μs+25.6μs

Dual Tap

Single Tap

Minimum Exposure Time=

{

58.1 μs (1/17000s)

83.7 μs (1/12000s)

Dual Tap

Single Tap

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JAI TMC-4200GE User Manual Page 76

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