Sony XC-ST51CE Manual - Halaman 4

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External Trigger Shutter

Inputting an external trigger pulse enables the camera to capture

fast-moving objects clearly with precise timing.

Set DIP switches 6, 7, and 8 on the rear panel to Mode 1 or Mode 2.

When you set the trigger pulse width to 1/3 of a second or more, the

output signal changes to the normal VIDEO signal.

There are two modes for the timing in which video signals are

obtained.

•

Mode 1 (Non-reset mode)

In this mode, a video signal synchronized with a VD signal is

output after a trigger pulse is input.

– The video signal is synchronized with the external VD signal

when an external HD/VD signal is input.

– The video signal is synchronized with an internal VD signal when

no external HD/VD signal is input.

•

Mode 2 (Reset mode)

In this mode, an internal VD is reset, then a video signal is output

a certain period of time after trigger pulse input.

To Set the External Trigger Shutter

There are two ways to set the shutter speed.

•

Using the DIP switches on the rear panel

For shutter speeds, see the following table.

Mode 1 (Non-reset mode)

1/100

(EIA)

1/125

1/250

1/500

1/120

(CCIR)

1/10000

(EIA)

1/1000

1/2000

1/4000

1/8000

(CCIR)

(Unit: second)

Note

The DIP switch 5 position is optional. (The fi eld setting is

recommended.) The fi eld setting can obtain a sensitivity that is

twice that of the frame setting.

•

Using trigger pulse width

Set all DIP switches (1 to 4 on the rear panel) to 0.

You can obtain an arbitrary shutter speed by setting the trigger

pulse width within the range of 2 μ s to 250 ms.

Mode 1 (Non-reset mode)

Exposure time = Trigger pulse width + 97 μ s (EIA)

Trigger pulse width + 120 μ s (CCIR)

Note

•

The DIP switch 5 position is optional. (The fi eld setting is

recomended.) The fi eld setting can obtain a sensitivity that is

twice that of the frame setting.

•

If you input another trigger pulse before the video signal output

for the previous trigger pulse is completely output, an incorrect

video signal will be output.

Mode 2 (Reset mode)

1/100

(EIA)

1/125

1/250

1/500

1/120

(CCIR)

1/10000

(EIA)

1/1000

1/2000

1/4000

1/8000

(CCIR)

(Unit: second)

Mode 2 (Reset mode)

Speciﬁ cations of trigger pulse

•

When using a trigger pulse like shown below, set the TRIG

polarity selector switch on the rear panel to + :

2 μs to 1/4 sec

If you set the trigger pulse with the DIP switches, use the 100 μ s to 1/4 sec pulse width.

•

When using a trigger pulse like shown below, set the TRIG

polarity selector switch on the rear panel to - :

2 μs to 1/4 sec

•

Input impedance: 10 kΩ or more.

•

The voltage and pulse width used are measured at pin 11 of a 12-pin multi-connector on

the rear panel.

Restart/Reset

To Set Restart/Reset Mode

The information on one screen can be extracted

at any time by externally inputting Restart/

Reset signals (HD/VD). To enter this mode, set

the trigger shutter switches (6 to 8) on the rear

panel of the camera as shown in the fi gure

below.

The Reset/Restart mode is especially effective

for frame image output with long exposure or a

strobe light.

Long Exposure

The Restart/Reset function extends the CCD accumulation time,

resulting in highly sensitive image capture. This function is effective

when you cannot gain satisfactory sensitivity under normal operating

conditions, or when you want to observe the trail of a moving object.

Extend the VD interval (T) between external VD pulses.

Sample input timing chart 1

Continuous signal: 15.734 kHz (XC-ST51/ST50/ST30) Allowable frequency value ±1%,

EXT HD

15.625 kHz (XC-ST51CE/ST50CE/ST30CE) Allowable frequency value ±1%

VD interval (T): 262.5 H or more (XC-ST51/ST50/ST30) and less than 1 second (Recommended),

EXT VD

312.5 H or more (XC-ST51CE/ST50CE/ST30CE) and less than 1 second (Recommended)

Four or more VD pulses are required.

Exposure time for the Odd fi eld

Exposure time for the Even fi eld

Frame Accumulation (Factory setting)

Video output

Invalid image

Odd and even fi elds are determined by the phase of the EXT HD/VD signal input from the outside.

XC-ST70/ST70CE/ST50/ST50CE/ST51/ST51CE/ST30/ST30CE

2 V to 5.0 V

0 V to 0.6 V

4.0 V to 5.0 V

0 V to 2.0 V

DIP switches

Odd image

Even image

Valid frame image