Operating Modes
The TM-250/260 operates in the following modes that can be
selected by the DIP switch on the rear panel of the camera.
① Standard interlace Mode
Field integration Mode
Frame integration Mode
➁ External Sync Mode
➂ Noninterlace Mode
➃ Cyclic (continuous) Shutter Mode
➄ Asynchronous Reset and Asynchronous Shutter
➅ Reset-Restart Mode
Frame integration Mode
Field integration Mode
➆ Reset-Restart Mode with Electronic Shutter
Frame integration Mode
Field integration Mode
➇ Integration Mode (Strobe application)
❶ Standard Interlace Mode
Field Mode and Frame Mode
The field and frame integration mode is selectable.The frame
integration is used to separate all CCD pixels and the exposure
of Odd and Even fields generate the full frame image shown in
the figure below.
Field Mode Binning
The field integration is done by combining two pixel rows
(binning) together, each pair alternating as interlace scan is gen-
erated. Row 1 is binned with row 2, and row 3 is binned with
row 4. In Field 2, row 2 is binned with row 3, row 4 with row
5, and so on. Field mode is very effective in shutter mode
because the pixel sensitivity is doubled for field integration
(1/60 sec) and equals frame mode (one row at 1/30 sec).
Because Shutter mode is only one field output per shutter and
darker than normal image, two-row binning is effective.This
mode also reduces interlace moire when a sharp horizontal
pattern is observed. For higher pixel definition such as gauging
and sub-pixel interpolation, Frame mode operation is recom-
mended.
❷ External Sync Mode
The TM-250/260 accepts standard RS-170 external sync,
which is defined as horizontal sync (HD) and vertical sync
(VD).The phase-locked loop jitter is designed to be the mini-
mum (< 5ns) in this category using the latest PLL chip.The
wide capture range enables the camera to operate at an
extended temperature range (optional) of -35°C to 65°C. HD
and VD input is TTL level and the high impedance is 100KΩ or
75Ω (optional).
❸ Non-Interlace Operation Mode
With external sync of non-interlace, the camera operates at
non-interlace scanning. External VD must be generated at inte-
gers of 262H ± 8H. (Standard interlace is 262.5 H)
❹ Cyclic (Continuous) Shutter Mode
With back-plate shutter control, the TM-250/260 operates at
the internally predefined shutter speeds. Each field output is
exposed for the same period.The shutter control varies the
substrate discharge timing.The duration between the shutter
pulse and transfer gate timing (11H* from VD edge) decides the
exposure time. (*16H for CCIR) The following three cyclic
shutter modes are available:
• High-Speed Cyclic Shutter mode
• Trigger Position Reset/Restart Shutter mode
• Trigger Width Reset/Restart Shutter mode
Contact PULNiX for timing charts of various cyclic shutter
modes.
TM-250/260 High-Resolution Miniature CCD Camera
(116 Seiten)
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