JAI TM-6740GE, User Manual

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Operation 21
TM-6740GE Series
All AccuPiXEL color cameras are carefully designed for maximum color performance. JAI strongly suggests that
you use digital output for the best performance.
Some software is used on board (FPGA or DSP) to perform the interpolation. Other software simply uses the
host computer’s memory and CPU. The processing speed may vary depending on the architecture and speed of
the computer.
3.3 Electronic Shutter
The TM-6740GE has a substrate drain-type shutter mechanism which provides a superb picture at various speeds
without smearing. A built-in fixed shutter speed control selects the electronic shutter rate from 1/250 to
1/64,000.
Table 3 Electronic Shutter Speeds
Shutter Speed
Number
Manual Async.
0 1/frame rate Async No Shutter
1 1/250 sec 1/64,000 sec
2 1/500 sec 1/32,000 sec
3 1/1,000 sec 1/16,000 sec
4 1/2,000 sec 1/8,000 sec
5 1/4,000 sec 1/4,000 sec
6 1/8,000 sec 1/2,000 sec
7 1/16,000 sec 1/1,000 sec
8 1/32,000 sec 1/500 sec
9 1/64,000 sec PWC (pulse width control)
With VINIT high (CC1), the CCD keeps discharging. With an active low pulse to VINIT, the camera resets and
purges the charge momentarily. Then it starts integrating for the period of shutter control set by either an
external pulse width or internal shutter control. Progressive scanning in the TM-6740GE permits a full 480 lines
of vertical resolution, as compared to an interlaced CCD camera which captures only half the vertical lines per
shutter.
3.4 Integration
The CCD imager of the TM-6740GE can be exposed for longer than the normal scan timing of 1/200 sec. This
integration feature provides extra sensitivity for dark-environment applications. The progressive scan imager
permits a full frame of resolution in non-interlace format. Integration is achieved by controlling CC2 Camera
Control line through the Gigabit Ethernet cable to low (GND) or providing pulse-width control up to 1 sec.
Please refer to Figure 3, “12P-02S Interface Cable (optional),” on page 13 for pin-out information on the 12-pin
connector.
3.5 External Sync
The TM-6740GE accepts an external sync of standard HD and VD on CC3 and CC4 of the 12pin connector for
general locking to an external source. The frequency requirement is shown in Table 2 on page 17. The
tolerance is ±2% horizontal frequency.
3.6 Asynchronous Reset
The TM-6740GE camera includes four modes to control the asynchronous reset and shutter speed:
•
Async No Shutter (recommended for strobe applications)
•
Async Programmable Shutter
•
External VINIT with Pulse Width (No-Delay Shutter) and ROI (read-out-inhibit)