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too much power?


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#1 Leandro Silva

Leandro Silva

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Posted 29 April 2010 - 01:19 PM

Hello all,

I m using global media pro batteries on a Baer Bel sled. 3 batteries are necessary for 24v power plus monitor and wireless focus.
When fully charged, the two batteries that provide power read 32v, or 16v each. I m shooting with an arri 435 es. During prep, a small optex wireless sender got fried (connected only to the camera via RS cable). Rental said it was their own faulty cable.

I wonder if the camera is somehow overpowered. The manual states the camera can handle up to 35v power. Could the 32v be too close for comfort? Could I somehow fry accessories connected to the camera?

Thanks in advance for your time.

Leandro
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#2 Lukas Franz

Lukas Franz

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Posted 29 April 2010 - 02:58 PM

I don't think so. As far as I know the camera should have a regulated power output. It's not common that any film or video camera outputs an unregulated voltage for powering accessories. And even the input is regulated, so you may power the 435 even with up to 35V, shouldn't be a problem at all.
But you may check the ground (power and video gnd) of all accessories, camera, sled. Sometimes there are voltage differences between video and DC ground from accessories and if you wire everthing together it could fry delicate devices...

Good luck.

Lukas
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#3 Leandro Silva

Leandro Silva

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Posted 29 April 2010 - 07:35 PM

Hello Lukas,

Thanks a lot for your answer.

Do you think that, maybe, the problem lies with the sled? The video sender was powered by the camera, but it could be that it fried when the bnc cable touched the sled's bnc outlet? If that s the case, what could be that caused it? A short circuit?

Thanks again

Leandro
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#4 Lukas Franz

Lukas Franz

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Posted 30 April 2010 - 02:43 AM

Hi Leandro

Possible. Check the grounds with a voltmeter/multimeter. Do you have a voltage difference between DC ground and video ground on any device (sled, accessories). That actually shouldn't be but rarely there is. You also can check it with an Ohmmeter, without powering the devices.

Of course it could have been that (faulty) cable causing the problem or the video sender had a bad day. Electronic devices break.

Best.
Lukas
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