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114 How to use "RTR-61 for Windows"About Adjustment Methods[1 Point Adjustment]Use when measuring in a range of ±20C.This adjustment method changes onlythe offset (b) where the slope (a) isconsidered 1.For example, RTR-61 is measuring 10C, but the standard says the actualmeasurement should be 10.2 C. Enter10 in the Before Adjustment box and10.2 in the After Adjustment box. Theconversion equation will be Y=X+0.2and for all measurements anadjustment to the offset of +0.2 will bemade.[2 Point Adjustment]The adjustment equation will becalculated from two points: the slope (a)and the offset(b).For example, the RTR-61 reads 0C when the standard thermometerreads 0.1 C, and RTR-61 reads 10 Cwhen the standard says the truemeasurement is 10.2 C. In this case theslope (a) is 10.2-0.4/10-0=0.98. Theoffset is 0.4, so the conversion equationbecomes Y=0.98X+0.4. The range ofthe slope is 0one decimal point, but after calculationup to four digits are valid for the slopeand offset.- When adjusting at 2 points, it is important to make sure the points are not too close toeach other. The probability of measurement errors will increase in other ranges outsideof the two points. If possible, select two points apart from one another (we suggest atleast 10 degrees) to measure and make the necessary adjustments.- When adjusting at 2 points, make sure the difference in points is at least 10 degrees.- When measuring a wide range and adjusting at 2 points, make sure that the adjustmentvalues reflect the wide range you are measuring.- When adjusting at 2 points, any measurements that fall outside of those points aresubject to error. |
