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Operation Mode

TM-250 Miniature CCD Camera

5.2.5 Double Pulse Integration Mode

Double Pulse Integration mode enables exposure times to be longer than one ﬁeld. It also works for

strobe applications. The camera operates in the same way as it does in Asynchronous Strobe Shutter

mode. The transfer occurs only at one ﬁeld in Field Accumulation mode, or at two ﬁelds in Frame

Accumulation mode after the leading edge of VINIT pulse is detected. Discharge does not occur in this

mode so that the previous VINIT clears the photo accumulation, as in Cyclic No Shutter. Sync signal is

continuous when F2 switch is up (ON). Sync is available in the two ﬁelds (frame mode) and in the one

ﬁeld (ﬁeld mode) right after VINIT when the F2 switch is down (OFF).

FIGURE 18. Double Pulse Integration Mode

5.2.6 Pulse Width Integration Mode

Pulse width mode integration enables exposure time to be longer than one ﬁeld and also works for

strobe application. The camera operates in the same way as it does in Async Pulse Width Mode Shutter.

When VINIT is high, train of discharge pulse occurs. When the falling edge of VINIT pulse is detected,

the discharge stops and photo-charge accumulation starts. The rising edge of VINIT reset camera and

transfer happens at 11th line with TM-250 and at 16th line with TM-260. The transfer occurs only at

one ﬁeld in ﬁeld accumulation mode or at two ﬁelds in frame accumulation mode. SYNC signal is

continuous when F2 switch is Up (ON). SYNC is available only in the two ﬁelds (frame mode) and in

the one ﬁeld (ﬁeld mode) right after VINIT, when the F2 switch is down (OFF).

TABLE 12. Double Pulse Integration Mode

OFF

ASY

CYC

TRIGGER

Polarity

Up Up Up Up Up Down Negative

F2 Up: SYNC signal is continuous.

F2 Down: SYNC signal is available in the two ﬁelds (Frame

mode) and in one ﬁeld (Field mode) right after VINIT.

Reset Reset

VINIT

Video Out

Transfer

Strobe

Exposure

(Integration)

Internal VD

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Pulnix TM-250 Bedienerhandbuch Seite 33