Functions And Operations; Basic Functions - IAI CV-M40 Operating Manual

6. Functions and Operations

6.1. Basic functions

Apart from the standard continuous operation, the CV-M40 features two external asynchronous
trigger modes Edge Pre-select and Pulse Width Control mode. Edge Pre-select mode can operate
with delayed read out, where the trigger falling edge starts a pre-selected exposure, and the
raising edge starts the read out.
These external trigger modes can operate with either H reset or H non-reset. In H reset, the
internal HD is reset on the falling edge of the trigger and the exposure starts. H non-reset need
external HD input. The exposure will be synchronized to the internal HD. It will start on the first
HD after the trigger negative going edge. In Pulse width control mode, the exposure stops after
the first internal HD
following the trigger rising edge.
H reset or H non-reset trigger mode cannot be selected by switch, jumpers or RS-232C. The
mode is automatic selected depending of the input pin used for trigger, and if external HD is
applied.
Note: In H non-reset trigger modes the exposure start can be delayed up to 1H. In pulse width
control modes jitter in exposure time can be up to 1H. To avoid this <1H jitter, the trigger
pulse should be synchronized to the HD as shown in fig. 8.
EDGE PRE-SELECT
H non-reset
EDGE PRE-SELECT
Trigger
EDGE
Trigger
WIDTH
Trigger
FRAME-DELAY
READ OUT
Trigger
int. HD
Trigger
H reset
int. HD
Fig. 7. Trigger modes
CV-M40
Exposure
shutter time Read out
Exposure
Read out
Exposure
shutter time
Exposure
shutter time
Exposure
shutter time
Read out
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Read out
Read out