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# s-video: how many volts does C to GND and Y to GND have ?

Posted on 2009-02-19
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Hello,
I have given a plug with 25 pins, I know there must be a s-video signal on it, but I do not know on which pins. Can I find it with the digital volt meter, when the camera is turned on ?
- will the volt meter cause no harm to the camera ?
- what is a typical voltage between C-ground and chrominance and between Y-ground and luminance ?

Best regards, Sonja
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Question by:Sonja_M

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Expert Comment

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Assisted Solution

If u can isolate which pins plug into the camera you could just unplug the cable and use a continuity tester to find the corresponding pins on the other side
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Author Comment

Hi Jenkins,

to your first comment: I indeed have to make an interface between the given 25 pin plug and the 4 pin plug you showed. But I see no info about expected voltage in the text.

your second comment: I know this, but unfortunately I have no access to the camera side. So I really have to decide given only the 25 pin output, while the camera is running.

Thank you for your answers - maybe you know more about the voltage to be expected ?

Sonja
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Expert Comment

Well, your looking for around a 75ohm impedance and the maximum signal strength allowed by the FCC is 15.5dBmV for tv/catv so i would assume that the voltage your looking for is around that...

the voltage to expect at the end is dependent on the camera.
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Author Comment

Hi Jenkins,

what means "dBmV" ? How many volts would you expect ?

Sonja
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Expert Comment

I would say to look for between 5 - 8.4v
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Expert Comment

Sorry    -  mV
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Accepted Solution

RGB is standardized at 0.7 volts, and s-video should be at 1 volt.  For example, this article http://members.iinet.net.au/~davem2/overclock/a520.html refers to it.  I have worked on composite video (which can be derived from s-video) and the voltages were 1 volt.
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Author Comment

thank you, Callandor. In a image with average colors and average darkness: would you expect the two voltages YGnd-->Y and CGnd-->C to be both about the same, or would the first be 0.3 V and the second 0.7 ?

Sonja
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Assisted Solution

I would expect them to be roughly the same, since you can actually use each signal independently and the range is similar for both.  As long as you are only checking voltages of 1 volt or less, you can test it with a video screen without fear of damage.  A luminance only signal would render a black and white picture.
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