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t <br /> TYPE 3 ERRORS <br /> A Altitude. <br /> A 1000 foot change in altitude is equal to an error of approximately 3% at the 10 <br /> mg/l level <br />' B Humidity <br /> Errors occur if calibration is performed at less than 100% humidity The error <br />' vanes with the temperature as follows <br />' TEMPERATURE ERROR <br /> 0°C 0 02 mg/l <br /> 10°C 0 05 mg/l <br /> ` 20°C 0.12 mgll- <br /> 3 <br />' 30°C 0 27 mg/l <br /> 40°C 0 68 mg/l <br />' <br /> APPROXIMATING THE ERROR <br />' It is unlikely that the actual error in any measurement will be the maximum possible <br /> error A better error approximation is obtained using a root mean squared {r m s ) calculation <br /> r in s error — ±[la2 + lb' + 2a2 + 2b2 + 3a2 + 3b2]''. Mg/1 <br /> 1 _ <br /> I <br />' 14 <br />