nanog mailing list archives
Re: 220v/50hz power rig
From: Sean Donelan <sean () donelan com>
Date: 6 Sep 2001 10:47:49 -0700
On Thu, 06 September 2001, Alex Bligh wrote:
a wide frequency tolerance. The only problem you may run into is that some boxes are too clever by half, and autosense input frequency to determine output frequency.
Actually, its not being clever, its being cheap. If you use the input frequency to drive the output frequency, you don't need an extra crystal oscillator. Its cheaper, and results in fewer customer service calls about the clock running fast or slow. It also means, you can't just take a 50/Hz european UPS and plug it into an US plug at 220vac, and expect to still get 50/Hz out of it. When you plug it into the US grid, you'll get 60/Hz out. I spent a day troubleshooting a problem, until someone explained to me what was happening. That's why I now use a bench power supply, which explicitily generates the type of "international" power I want, instead of using a Rube Goldburg setup.
Current thread:
- Re: 220v/50hz power rig, (continued)
- Re: 220v/50hz power rig Alex Bligh (Sep 06)
- Re: 220v/50hz power rig David Luyer (Sep 06)
- Re: 220v/50hz power rig Lincoln Dale (Sep 06)
- Re: 220v/50hz power rig Vadim Antonov (Sep 06)
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- Re: 220v/50hz power rig Lincoln Dale (Sep 06)
- Re: 220v/50hz power rig Alex Bligh (Sep 06)
- Re: 220v/50hz power rig Randy Bush (Sep 06)
- Re: 220v/50hz power rig Kevin Loch (Sep 06)
- Re: 220v/50hz power rig Alex Bligh (Sep 06)