JAI CV-A60, CV-A50 operation manual Functions and Operations, Basic functions

CV-A50 / CV-A60

6. Functions and Operations

Apart from the standard continuous operation, the CV-A50/60 features three external asynchronous trigger modes (edge pre-select, pulse width controlled and start/stop) and a special frame-delay readout mode. Long integration time mode is also supported.

6.1. Basic functions

Some of the primary camera functions need a general introduction before the operation modes are described. The list below shows the primary functions from the command list.

SM	Shutter Mode	Normal shutter, Programmable Exposure
SH	Shutter Speed	Off to 1/10,000 second
PE	Programmable Exposure	1.5 H to 1023.5 H
SC	Scanning Format	Interlaced, non-interlaced, (1/2 partial, 1/3 partial)
TR	Trigger Mode	Normal, Edge, PWC, frame delay readout
		Long time exposure, start-stop
FR	Accumulation	Field, Frame

The shutter SM can be set to normal (SM=0), where the exposure time is selected from 8 fixed step with the command SH, or programmable exposure (SM=1). Here the command PE allows up to 1023 steps with 1 period resolution (64 µs) for edge pre-select mode. For normal modes PE can be up to 312 for CCIR and 262 for EIA.

The scanning format SC can be selected between interlaced and non-interlaced sync signals. Further it is possible to select 1/2 and 1/3 partial scanning. It is not supported for the camera.

The accumulation FR can be field or frame. Fig. 9. show details for frame and field accumulation with shutter OFF, (left(, and shutter on, (right).

The accumulation in all trigger modes is H synchronous. The exposure will start at the first HD pulse after the trigger falling edge. Fig. 8. shows the details. In all triggered shutter modes, the shortest shutter time is limited to ≥1.5 H or 1/10,000. In trigger modes, the exposure time is not limited to the readout time. It can be longer.

HD

Trigger

Accum

X b

Fig. 8. PWC H synchronous accumulation.

Time t0 t1 t2 t3 t4

VD

Frame accum. Xsg1Xsg2

Photo	Field 1
charge	Field 2

Video out
Interlaced	E	O

Field accum. Xsg

Photo	Field 1
charge	Field 2

Video out

Sync	Interlaced	E	O
		E	E

Time t0 t1 t2 t3 t4

VD

Frame accum. Xsg1Xsg2

Photo	Field 1
charge	Field 2

Video out

Interlaced E O

Field accum. Xsg

Photo	Field 1
charge	Field 2

Video out

Sync	Interlaced	E	O
	Non-interlaced	E	E

Fig. 9. Frame and field accumulation without shutter (left) and with shutter (right).

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