Pulnix TM-76 Manual de instrucciones descargar pdf (Pagina 20)

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TM-75/76 External Signals

TM-75/76 High-Resolution CCD Camera

For External HD, VD sync mode or Reset-Restart mode selection, please refer to Section 3.1.1, “Mode

Selection,” on page 8. Mode switch F2 must be set to ON for R-R mode and keep it OFF for normal HD,

VD external sync mode.

FIGURE 5. HD and Reset-Restart (VD) Relationship

4.4 External Trigger (TRIG) and Internal Sampling Clock

To ensure stable operation without the inﬂuence of jitter, the TM-75/76 samples shutter trigger pulse

(TRIG) by internal sampling clock (LCLK) and detects the low to high level change of TRIG. The

sampling occurs only at HD leading edge timing to generate the internal TRIG as shown below.

Therefore, the external TRIG pulse must be wider than 1H (64 µsec) for pulse width and pulse position

shutter control. All trigger pulse modes must work with Reset-Restart VD, which is described in

Section 5, “Operation Mode,” The TRIG input is pin #9 of the12-pin connector and the input impedance

is 100Ω.

FIGURE 6. External Trigger Timing

Odd

Field

Even

Field

Even

Field

Field Mode

Video

Frame Mode

Video

Field Mode VD

(Min. 2 pulses)

Frame Mode VD

(Min. 4 pulses)

EXT. HD for PLL

Invalid image Invalid image

Invalid images

Good image

(one field only)

Good image

Good images

(one full frame)

(Relationship with HD and Reset-Restart VD affects Odd or Even field output)

Even

Field

Odd

Field

Odd

Field

Odd

Field

Even

Field

Odd

Field

Even

Field

Field Images

(alternate different fields)

EXT. HD

EXT. TRIG

PIXEL CLOCK

LCLCK

INTERNAL TRIG (NORMAL)

Sampling

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 38 39

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Pulnix TM-76 Manual de instrucciones Pagina 20

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