Repeatability. The repeatability, defined as 2.5 times the standard deviation of ten repetitive responses to a given calibration or span gas, must be no greater than ± 1% of full scale concentration for each range used above 155 ppm (or ppm C) or ± 2% of each range used below 155 ppm (or ppm C).
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Repeatability. The repeatability, defined as 2.5 times the standard deviation of ten repetitive responses to a given calibration or span gas, must be no greater than ± 1% 1 per cent of full scale concentration for each range used above 155 ppm (or ppm C) or ± 2% 2 per cent of each range used below 155 ppm (or ppm C).
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Sources: Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles