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LF210-S Arkusz danych(PDF) 6 Page - LEM |
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LF210-S Arkusz danych(HTML) 6 Page - LEM |
6 / 7 page Page 6/7 26October2015/Version 5 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com LF 210-S Sensitivity and linearity To measure sensitivity and linearity, the primary current (DC) is cycled from 0 to I PM, then to −IPM and back to 0 (equally spaced I PM/10 steps). The sensitivity G is defined as the slope of the linear regression line for a cycle between ±I PM. The linearity error ε L is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of the maximum measured value. Magnetic offset The magnetic offset I OM is the change of offset after a given current has been applied to the input. It is included in the linearity error as long as the transducer remains in its measuring range. Electrical offset The electrical offset current I OE is the residual output current when the input current is zero. −500 −400 −300 −200 −100 0 100 200 300 400 500 −0.1 −0.05 0 0.05 0.1 Primary Current (A) Figure 5: Linearity Performance parameters definition Overall accuracy The overall accuracy X G is the error at ±IPN, relative to the rated value I PN. It includes all errors mentioned above. Response and reaction times The response time t r and the reaction time tra are shown in the next figure. Both slightly depend on the primary current di/dt. They are measured at nominal current. Figure 6: Response time t r and reaction time tra I S t r t ra t 90 % 10 % 100 % I P I Typical performance characteristics |
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