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Dimmer Flickering on an iPC

I have a customer running an iPC that is experiencing flickering outputs from dimmers at 0%. If he gives them an intensity value of 1%, the problem disappears. It's a permanent install and they have the iPC connected to their Lectrol dimmers via a Pathport network.

He said an old remedy for that problem was to adjust the DMX refresh rate of the console, but he didn't see anyway to do that in the Hog 3 manual. I am wondering if it's a dimmer issue or perhaps noise on the Ethernet line in the Pathport network. I don't see how the console could be causing it unless there is something to the DMX refresh issue.

Anyone else dealt with a problem like this? Thanks in advance.


Travis Slyter
Ruehling Associates, Inc.
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    I can't imagine a modern dimmer being that sensitive to DMX signal timing. 15 years ago, perhaps, but not now. I wonder if something else is going on here.

    Can you describe what they are seeing a bit more clearly? When they set the channel to zero, they get a slight flicker, but when they set it to 1, it stops? Most quarz lamps won't even start to glow until 4 or 5 percent, unless the dimmer (or Pathport system) is using some kind of pre-heat on the channel. Do the lamps ever go fully off? Is the lamp emitting visible light at 0 and 1%? Do they get flicker at 50%, or Full?

    One more thought: Make sure the analog inputs are disabled if they are not using them. That could be feeding garbage into the control logic.
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    I can't imagine a modern dimmer being that sensitive to DMX signal timing. 15 years ago, perhaps, but not now. I wonder if something else is going on here.

    Can you describe what they are seeing a bit more clearly? When they set the channel to zero, they get a slight flicker, but when they set it to 1, it stops? Most quarz lamps won't even start to glow until 4 or 5 percent, unless the dimmer (or Pathport system) is using some kind of pre-heat on the channel. Do the lamps ever go fully off? Is the lamp emitting visible light at 0 and 1%? Do they get flicker at 50%, or Full?

    One more thought: Make sure the analog inputs are disabled if they are not using them. That could be feeding garbage into the control logic.
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