Toshiba ik-tf7u External Sync, External sync signal polarity, External sync frequency range

7. 6 External Sync

When using the unit with an external sync signal, input HD and VD to CC3 and CC4 of the DIGITAL terminal. When the external sync signal is input, the camera automatically switches its sync from the internal sync to the external sync.

The operation is as shown below, depending on the unit's status and how external sync signals are input.

Shutter mode	HD input	VD input	Note
At time of SYNC-NON	N	N	Internal sync mode
RESET mode	Y	Y	External sync mode
	N	Y	Only V reset is applied due to VD input. Normally not used.
	Y	N	HD is synchronized to external, but video is not output
			because there is no VD input. Normally not used.
At time of SYNC-RESET	N	*	Internal sync mode. The presence of VD is ignored, and after
mode			a specified time after a trigger input, V reset is applied.
	Y	*	HD is synchronized to external. The presence of VD is
			ignored, and after a specified time after a trigger input, V
			reset is applied.
At time of reset restart	Y	Y	HD is synchronized to external. Video is output due to VD
			input.
	N	Y	HD is synchronized to the inside of the camera. Video is
			output due to VD input.
	*	N	Video is not output because there is no VD input. Normally
			not used.
At time of manual	N	N	Internal sync mode
shutter	Y	Y	External sync mode
	Y	N	HD is synchronized to external. Normally not used.
	N	Y	Disabled

*Either Y or N is permitted.

( 1 ) External sync signal polarity

HD: 2 to 5V(p-p)	Negative
VD: 2 to 5V(p-p)	Negative

( 2 ) External sync frequency range

(External sync with HD, VD)

Within ±1% (at horizontal sync frequency of 23.229 kHz)

( 3 ) Using the unit with external sync signal

When adjusting H (horizontal) phase refer to the item "7.2 (5) (5.1) Adjusting horizontal phase".

(3. 1) H (horizontal) phase adjustment

Observe the external sync signal and the LVAL signal output waveform of the unit with a dual trace oscilloscope, and ad- just H phase so that the H phases match.

External

Sync. signal Match

the phase.

LVAL signal output

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