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Subject: calibrated meter

Date: 01/22/02 at 2:53 PM
Posted by: Jim
E-mail: jconick@delta-engineering.com
Message Posted:

I am building an ac load (120v), converted to dc for measuring watts from 1W to 100W. However while checking the unit meter with a calibrated meter, I am setting at 9W and the meter reads 10W on the low side for a 10% error, on the high side I read 106 watts when set for 100W. I tried potentiometers (1 on the low side and 1 on the high, and with one for the mid range) to reduce the error but all it did was push my error from one end to the other. Any ideas on how I can reduce or eliminate this error. I want to keep it fairly simple. Thanks, Jim

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