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Error +/- 0,05 Ohm?
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#1 (permalink)      2/21/2018 11:03:19 AM US Central   quote/reply + tips
Demious
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Error +/- 0,05 Ohm?
When you're building low-resistance coils, say for competition purposes, isnt 0,05 Ohm a very large error margin?
Say the coil I'm testing measures 0,10 Ohm, which comes down to 41A, which is within the safe area, considering that a VTC6 can do 19seconds pulses at 55A. However, if the measurement deviates by 0,05 Ohm and the actual value of the coils turns out to be 0,05 Ohm, which is 82A, that would mean that the measurement tells you the coil is safe, while the actual value even draws twice as much current and will quite possibly be dangerous.
So how do we know if a coil will actually be safe or not, when the error margin might go well over that threshold?
#2 (permalink)      2/21/2018 12:35:12 PM US Central   quote/reply + tips
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F_Ramzi
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The spec is mileading. The proper expression in case of a multimeter error is by a percentage, like +/- 5% of the measured value.

In a proper professional ohm meter it would automatically change the range to suit what you are actually measuring, thus minimizing errors. But in this cheap device it looks like its set on a single range.

Edited on 2/21/2018 at 12:37 PM. Reason: Add info