FAQ No. FAQ00705
Question
What is the measuring accuracy when
measuring circumferential speed with the K3NR?
Answer
The measuring accuracy for K3NR operating
mode 1 (rotational/circumferential speed) is ±0.006% rdg ±1 digit. If the
variation of input pulses is not considered, the error depends on the
number of significant digits displayed below the decimal point. The error
is the error in the read value.
Example 1: Error When Displaying 85.000 km/h
Calculation: 85.000 km/h × (0.006%) = ±0.0051 km/h
In this case, three digits are displayed below the decimal point, so the
fourth digit below the decimal point in ±0.0051 km/h is rounded off to
yield an accuracy of ±0.005 km/h. There is also an error of ±1 added to
the rightmost digit (±0.001 km/h) for a total error of ±0.005 km/h ±0.001
km/h = ±0.006 km/h. Consequently, the display may vary between 84.994 and
85.006 km/h.
Example 2: Error
When Displaying 85.00 km/h
Calculation: 85.000 km/h × (±0.006%) = ±0.0051 km/h
In this case, two digits are displayed below the decimal point, so the
third digit below the decimal point in ±0.0051 km/h is rounded off to
yield an accuracy of ±0.01 km/h. There is also an error of ±1 added to the
rightmost digit (±0.01 km/h) for a total error of ±0.01 km/h ±0.01 km/h =
±0.02 km/h. Consequently, the display may vary between 84.98 and 85.02
km/h.
Example 3: Error When Displaying 85.0 km/h
Calculation: 85.000 km/h × (±0.006%) = ±0.0051 km/h
In this case, one digit is displayed below the decimal point, so the
second digit below the decimal point in ±0.0051 km/h is rounded off to
yield an accuracy of ±0.0 km/h. There is also an error of ±1 added to the
rightmost digit (±0.1 km/h) for a total error of ±0.0 km/h ±0.1 km/h =
±0.1 km/h. Consequently, the display may vary between 84.9 and 85.1 km/h.
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