Redlake MASD 4.2i Manuel d'utilisateur télécharger pdf (Page 20)

REDLAKE MASD, INC.

3.6 Exposure

This command sets the exposure time of the camera in increments of one millisecond. The

exposure times can be any value between one millisecond and one hundred seconds. This

exposure time setting affects the CONTINUOUS and TRIGGER modes only. The camera

produces the most uniform picture when the exposure time is between 50 and 200 milliseconds.

The maximum frame rate is directly related to exposure time. The maximum frame rate with the

exposure set for 50 milliseconds is 1.8 frames per second. For an exposure time of 500

milliseconds, the fastest frame rate becomes 1.0 frame per second.

Frame Rate = 1/(485 milliseconds + exposure time + shutter transition time)

When your application involves low light levels and a subject that is not moving, exposure times

of more than one second may be necessary. As you push the exposure time beyond one

second, you may notice that image quality deteriorates. This is caused by sensor dark current

accumulating over time. The CONTROL mode allows you to extend the exposure time beyond

100 seconds, but you should understand that picture quality degrades with the longer exposure

times.

TYPE IN: RESPONSE EXPLANATION

EXExxxxxx

CR-LF Sets the exposure in one millisecond increments

using the argument with a range from 1 to 100000.

EXE?

Queries the current Exposure setting.

EXExxxxxx Means the exposure is set as indicated.

Sample commands with arguments:

EXE 1 Sets the Exposure to one millisecond.

EXE 100000 Sets the Exposure to one hundred thousand milliseconds (100 seconds).

91000058-003 Revision A 3-4 10/01/01

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Redlake MASD 4.2i Manuel d'utilisateur Page 20