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Unread 06-04-2005, 13:32
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Chris Hibner Chris Hibner is offline
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Re: How to measure low velocity

Quote:
Originally Posted by Kevin Sevcik
Al this sounds about right.... To combat this, what's the feasibility of fabricating/buying a fairly precise amp to spread the voltage range to 0-5V? Possibly greater if you're unlikely to be turning faster than 150deg/s.
That is generally the only difference when you have a manufacturer that sells similar sensors with different output ranges: the measurement cell is usually the same and they just change an amplifier stage on their ASIC.

For a one-off application, this would be an okay thing to do if you need to really optimize your range and you can't buy an off-the-shelf part to fit your needs. For a mass production application, you wouldn't want to do this - not only from a cost standpoint, but the amplifier adds another error source and then it will probably become impossible to meet your performance objectives with the error stack up. For a one-off you're going to calibrate anyway so that shouldn't be an issue.
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