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LAX-100-NP Datasheet(PDF) 9 Page - LEM |
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LAX-100-NP Datasheet(HTML) 9 Page - LEM |
9 / 12 page Page 9/12 www .lem.com LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. 070615/8 Response and reaction times The response time t r and the reaction time tra are shown in the next figure. Both depend on the primary current di/dt. They are measured at nominal ampere-turns. The "di/dt accurately followed" mentionned in the electrical data table is defined as the di/dt of the primary current for which the response time is equal to 1 µs. Figure 20: response time t r and reaction time t ra Electrical offset The electrical offset current I OE can either be measured when the ferro-magnetic parts of the transducer are: • completely demagnetized, which is difficult to realize, or • in a known magnetization state, like in the current cycle shown above. Using the current cycle shown in figure 19, the electrical offset is: The temperature variation I OT of the electrical offset current I OE is the variation of the electrical offset from 25°C to the considered temperature: Note: the transducer has to be demagnetized prior to the application of the current cycle (for example with a demagnetization tunnel). Overall accuracy The overall accuracy at 25°C X G is the error in the - IPN .. + IPN range, relative to the rated value I PN. It includes: • the electrical offset I OE • the sensitivity error ε G • the linearity error ε L (to IPN) The magnetic offset is part of the overall accuracy. It is taken into account in the linearity error figure provided the transducer has not been magnetized by a current higher than I PN. 2 ) ( ) ( 2 1 t Is t Is OE I + = ) 25 ( ) ( ) ( C I T I T OT I OE OE ° − = Performance parameters definition (continued) LAX series 16-100 A I t ra I s t r I p 90 % 10 % t 100 % |
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