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Operation Mode

TM-75/76 High-Resolution CCD Camera

5.4 Pulse Position Reset-Restart Shutter

The shutter trigger pulse (TRIG) is required to be wider than 1H (>70 µsec) for this operation. Like

continuous shutter mode, the last discharge pulse occurs as external shutter control. The position is

determined at 1H after the detection of the TRIG pulse edge. The transfer (read out) occurs at 9.5H

(14.5H for the TM-76) from reset-restart VD leading edge. The minimum exposure time is 0.5H (34.4

µsec). Because the shutter operation is synchronized with an internal horizontal clock, a stable exposure

time is assured even though TRIG is applied with minor variation relative to the HD timing. In order to

avoid ﬂickering between each ﬁeld exposure, it is advisable to synchronize the TRIG with reset-restart

VD. If one frame (two ﬁelds) of shutter images are required, the TRIG pulse must be synchronous to the

interlace scanning relationship.

FIGURE 13. Pulse Position Reset-Restart Timing

FIGURE 14. Pulse Position Odd Field Timing

EXT. VD (R-R)

EXT. TRIG

Discharge

Transfer Gate

Accumulation

(Exposure)

Video

INTERNAL

TRIG

9.5H (EIA), 14.5H (CCIR)

VD (Internal)

EXT. TRIG

INTERNAL TRIG

DISCHARGE

TRANSFER

Min. Exposure (1/2H)

Exposure Time: = (9.5H -1H) - 8 H=0.5H (EIA)

= (14.5H-1H) -13H=0.5H (CCIR)

ODD Field Relationship

Shortest Exposure Example: 8H for EIA, 13H for CCIR

9,5H (EIA), 14.5H (CCIR)

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Pulnix TM-76 Manual de instrucciones Pagina 25