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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.
Fig. 8. PWC H synchronous accumulation.
HD
Trigger
Xb
Accum
t0
t1 t2 t3 t4
t0
t1 t2 t3 t4
Tim e
Tim e
Tim eTim e
t0
t1 t2 t3 t4
t0
t1 t2 t3 t4
EE
Frame accum.
Fi el d ac cu m.
Phot o
charge
Phot o
charge
Video out
EO
Video out
EO
Fi el d 1
Fi el d 2
Fi el d 1
Fi el d 2
VD
Xsg1
Xsg2
Xsg
Interlaced
Sync
Interlaced
EE
Frame accum.
Fi el d ac cu m.
Phot o
charge
Phot o
charge
Video out
EO
Video out
EO
Fi el d 1
Fi el d 2
Fi el d 1
Fi el d 2
VD
Xsg1
Xsg2
Xsg
Interlaced
Sync
Interlaced
Non-interlaced
EE
Frame accum.
Fi el d accu m.
Phot o
charge
Phot o
charge
Video out
EO
Video out
EO
Fi el d 1
Fi el d 2
Fi eld 1
Fi el d 2
VD
Xsg1
Xsg2
Xsg
Interlaced
Sync
Interlaced
Non-interlaced
EE
Frame accum.
Fi el d accu m.
Phot o
charge
Phot o
charge
Video out
EO
Video out
EO
Fi el d 1
Fi el d 2
Fi eld 1
Fi el d 2
VD
Xsg1
Xsg2
Xsg
Interlaced
Sync
Interlaced
Fig. 9. Frame and field accumulation without shutter (left) and with shutter (right).
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