Escene ES310 Bedienungsanleitung PDF herunterladen (Seite 26)

3.8

Selecting an Operating Mode

MODE CONTROL

The KODAK MEGAPLUS Camera operates in one of four modes, continuous,

control, trigger, or retriggered. The mode of operation is selected by the mode

command.

Continuous

The camera can take pictures at 15, 25, 30, 50, 60, and 85 frames per second

(fps). The frame rate is set by the FRS command, The default frame rate is

30 fps. The exposure time range is from 94 microseconds to one divided by the

frame rate. For example, the maximum exposure is 11 milliseconds at 85 fps.

The camera can be synchronized to an external trigger source through the Trigger

input on the rear panel of the camera or the EXPOSE input of the AIA interface

connector. The trigger input frequency must be between 84.5 and 85.5 Hz. If the

camera is not externally triggered its frame rate will be 84.5 fps. When multiple

cameras are driven from the same trigger source they will be synchronized to

each other within ± 100 nanoseconds. The digital video output pauses for one

row time at the time the exposure starts for the next frame. See continuous mode

timing diagram in chapter 4 for details.

Control

The start and exposure time of each image is controlled directly by the user.

Control is accomplished by the EXPOSE input pins in the AIA interface connec-

tor or the trigger input on the rear panel of the camera. The exposure time is

equal to the time the EXPOSE input signal is true. The frame rate is inversely

proportional to the exposure plus readout time. The exposure time can be as long

as needed, but at room temperatures dark field nonuniformities become more

noticeable with increasing exposure times.

Trigger

Each exposure is started by a signal connected to the EXPOSE input pins of the

AIA interface connector or the trigger input on the rear panel of the camera. The

exposure command sets the exposure time. An exposure starts 20 microseconds

(± 100 nanoseconds) after the active edge of the trigger pulse and ends after the

exposure time set by the EXE command. The active edge of the trigger pulse is

selected using the TRM command.

The EXPOSE input sets the start time for each frame of video. The camera will

ignore additional EXPOSE signals until it completes the current exposure. The

trigger mode of operation is used to capture a single image or sequence of

images.

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Escene ES310 Bedienungsanleitung Seite 26