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IM MW100-01E
When the Calibration Coefficient is Known
An example using a displacement gauge provides an explanation.
• Rated input 20 mm
• Calibration coefficient 0.003998 mm / (1 µV/V)
Basically, if you can convert the calibration coefficient to the rated output mentioned in
“When Rated Input and Rated Output Are Known,” the previous equation can be used.
Using equation 1,
1 µV/V = 0.001 mV/V = 0.001 × 2000 µSTR = 2 µSTR
therefore the rated output with this sensor when 20 mm is input would be
20 mm ÷ [0.003998 mm/2 µSTR] = 10005 µSTR
in other words, for 1 mm, an output of:
10005 µSTR / 20 mm = 500.25 µSTR/mm
can be obtained.
Thereafter in the same manner, if you wish to measure with a scale of 2 mm to 15 mm,
the settings are
Scale minimum: 2
Scale maximum: 15 (Units: mm)
therefore,
Span minimum: 2 × 500.25 µSTR/mm = 1000.5 µSTR
Span maximum: 15 × 500.25 µSTR = 7503.75 µSTR
would be appropriate settings.
Since the measurement range is the 20000 µSTR range, the resolution on the MW100
comes to 1 µSTR, so we round to the following:
Span minimum: 1001 µSTR
Span maximum: 7504 µSTR
1.7 Functions of the 4-CH, Medium-Speed Strain Input Module
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