Pulnix TM-250 Instrukcja Obsługi Pobierz pdf (Strona 23)

Page 17

TM-250 External Signals

TM-250 Miniature CCD Camera

4.3 Width Mode Reset-Restart Operation

In Width Mode Reset-Restart operation, the leading edge and trailing edge of TRIG must both be

synchronized with external HD. In addition, the duration must be 1 line or longer in one-line step. If the

TRIG does not meet these conditions, the exposure time may vary from the position and the ﬁeld.

Figure 7 below illustrates the proper operation with constant 2-line exposure period. Figure 8, on the

other hand, illustrates the illegal operation where the exposure time varies by the position of TRIG.

Shutter Trigger generates 1-line long-exposure at position A and 2-line-long exposure at position B

because the TRIG pulse is clocked in the same timing but the termination does not have the same

timing. The same happens by the difference of ﬁeld (odd or even).

FIGURE 7. Proper Operation

FIGURE 8. Illegal Operation

HCLK

EXT HD

TRIG

Sample

Clocked in here

Exposure (A)

Exposure (B)

HCLK

EXT HD

TRIG (Case A)

TRIG (Case B)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 40 41

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