The accuracy is defined by the manufacturer's data sheet as +/- 1% of IPn. For a 200amp unit this means an accuracy specification (or typical error) of +/- 2 amps. Contrary to what might be intuitive, measured error is not prorata over the device range. With 0 amps of current flowing the output could read + or - 2 amps and still meet the manufacturer's specified accuracy !!

So, if you are measuring a maximum of 10 amps the possible error could be +/- 2 amps. It could read anywhere between 8 amps to 12 amps. This is a measurement error of +/- 20%. For obvious reasons the lower your measured current the larger the percentage of error.

By increasing the number of core passes, say 5 times, your 10 amps is measured as 50 amps and the error tolerance is still +/- 2 amps which represents a +/- 4% error. Not good but very much better than +/- 20%

Therefore the larger the number of turns you can pass through the core, within the limits of the device range, the better the measurement accuracy and the larger the signal change for your measured current.

jack