Mikrotron MC13xx Especificaciones descargar pdf (Pagina 19)

Configuration MC13xx Users Manual Rev. 1.08

This is valid for a line length between 250 and 640 pixel.

command :s <x

> ... range 0 ... f (hex)

Before selecting the data rate of the camera check

the maximum data rate of the frame grabber, which

must be higher (or at least the same).

6.8 Exposure control

Exposure control is selected with register r6[7..4] and register r2[9..0].

Bit(s) Description

r6[7..4] Type of exposure

r2[9..0] Exposure time

table 6-1

6.8.1 Type of exposure

The MC13xx can expose the images synchronous or asynchronous.

Synchronous means that the next image is exposed, while the current image is output.

With asynchronous exposure, an external signal starts exposre, and the exposed image is output after the

exposure ends. Exposure time is defined either by an internal timer or by the width of the external EXP

– signal. Bits 7..4 of registers r6 define exposure type: (:r6[7..4]).

r6 Bits 7 6 5 4

Camera stop x x x 0

Synchronous 0 0 0 1

Synchronous, with electr. shutter 0 0 1 1

Asynchronous, pulse width 1 0 1 1

Asynchronous, timer 1 1 1 1

Table 6.8-1

6.8.2 Frame rate with synchronous exposure

The frame rate with synchronous exposure is direct proportional to the selected number of lines.

The time for one line is::

= 1/F

sens

• 136 [sec]

...time/line

sens

... Sensorclock

Frame rate: = 1 / (time/line • number of lines+1) or:

= F

sens

/ (136 • (r3[9..0] +2))

Dependencies between image size and frame rate for typical clock frequencies are given in the follow-

ing table:

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 49 50

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Mikrotron MC13xx Especificaciones Pagina 19