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Type: Posts; User: Robert Hofmeyr

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    I don't believe this is correct. Connecting the...

    I don't believe this is correct. Connecting the positive of a battery does not cause current to go to ground. Power needs a circuit. When only one pole is connected, there is no circuit, so the...
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    Yeah. I ordered one of those isolators but they...

    Yeah. I ordered one of those isolators but they are backordered at B&H, estimated arrival 2-4 weeks. If anyone knows where they are in stock, please let me know.
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    It's confusing, isn't it? And even when you do...

    It's confusing, isn't it? And even when you do get a response from someone online saying do this or that, how do you know if they really know what they are talking about? That's why Red needs to...
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    Agreed. I saw another guy on the Red Komodo Users...

    Agreed. I saw another guy on the Red Komodo Users FB yesterday with a blown SDI. He had no idea about the issue or the order of operation.
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    Maybe this is the solution :) Do you monitor...

    Maybe this is the solution :) Do you monitor using Red Control? Do you find the lag acceptable for pulling focus?
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    It seems to be an issue with all 12G SDI cameras....

    It seems to be an issue with all 12G SDI cameras. But most other cameras have multiple video outputs, so if you blow an SDI you can keep shooting. I do think there do seem to be a rather high number...
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    I agree. It would be great to get some proper...

    I agree. It would be great to get some proper feedback that we know is correct. I'm currently just listening to whoever sounds the most convincing online :). And if my (admittedly very rough)...
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    I got some feedback from Red support, but I'm...

    I got some feedback from Red support, but I'm afraid it seems to just add to the confusion. They keep referring to powering off the camera and monitor when adjusting or removing the SDI, but don't...
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    But a circuit will not be formed, so I'm failing...

    But a circuit will not be formed, so I'm failing to see how power will flow from the positive of the aux battery via the SDI to the negative of the main battery. Where does the power go from there?...
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    My understanding is that this is not quite the...

    My understanding is that this is not quite the case. Connecting only a positive does not cause power to go anywhere. Current does not flow from the positive of one battery to the negative of another....
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    Regarding the isolators, according to the Komodo...

    Regarding the isolators, according to the Komodo Users FB discussion, these will also work: https://www.bhphotovideo.com/c/product/843846-REG/allen_avionics_hd_vit_75_video_isolation.html. They are...
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    :) And maybe let us attach images bigger than...

    :) And maybe let us attach images bigger than 620x280
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    I also assumed this, but then I saw that you can...

    I also assumed this, but then I saw that you can get 12G galvanic isolators: http://len.co.uk/products-catalogue/products/4k12g-sdi-video-galvanic-isolator-barrel-style/
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    Thanks Blair. I don't have my Komodo yet (which...

    Thanks Blair. I don't have my Komodo yet (which is why I am spending so much time on Refuser :). I plan to power the monitor and camera from separate batteries. I will test if the chassis are...
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    I don't think a ground loop will result in...

    I don't think a ground loop will result in over-current. AFAIK it is not a short circuit - the accessory is just using the wrong path to get to ground but it will pull the same amps as normal.
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    Another question: if galvanic isolators...

    Another question: if galvanic isolators effectively prevent these problems, why is there not one inside the camera already? Is there a downside to using one?
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    Thanks Blair. And do you know if connecting the...

    Thanks Blair. And do you know if connecting the chassis of the camera with the chassis of the monitor (assuming it's metal) will provide a common ground through which the current can run preventing...
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    Thanks Bill. That must be the part I was missing...

    Thanks Bill. That must be the part I was missing with my rather basic electronics knowledge. So when connecting a battery to the monitor, and there is already a battery on the camera, and the...
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    Yeah, I'm just trying to get some clarity on why...

    Yeah, I'm just trying to get some clarity on why they say that. If you connect only the positive pole of a monitor battery, I don't believe it will cause much current to flow. You can test this with...
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    View Post

    Thanks Björn. I don't understand how there could be a danger when connecting a battery and the positive connects first. Before the ground makes contact, the positive does nothing and cannot damage...
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    I am aware of that. But I would like more...

    I am aware of that. But I would like more information. There is no way I will always be able to follow the order of operation, so I am looking at other ways to reduce the risk. But I am stuck because...
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    Thanks for confirming this Aaron, that is what I...

    Thanks for confirming this Aaron, that is what I thought might be the case.
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    Hi Amarin. My list was a bit tongue-in-cheek: it...

    Hi Amarin. My list was a bit tongue-in-cheek: it would be very hard to follow all those rules, and impossible in most production environments.

    The truth is we don't seem to be entirely sure what...
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    Good idea.

    Good idea.
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    Here's a summary of what we have learned if we...

    Here's a summary of what we have learned if we want to avoid blowing the SDI:

    - Only use high quality 12G-SDI cables
    - Don't power your monitor via d-tap
    - Don't power your monitor from it's own...
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