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LAX series 16-100 A
Performance parameters definition (continued)
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.
Response and reaction times
The response time t r and the reaction time t ra 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.
Using the current cycle shown in figure 19, the electrical
offset is:
I
I
OE
=
Is ( t 1 ) + Is ( t 2 )
2
1 0 0 %
9 0 %
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:
I p
t r
I s
I
OT
( T ) = I OE ( T ) ? I OE ( 25 ° C )
1 0 %
Note: the transducer has to be demagnetized prior to the
application of the current cycle (for example with a
demagnetization tunnel).
t ra
Figure 20: response time t r and reaction time t ra
t
Overall accuracy
The overall accuracy at 25°C X G is the error in the - I PN .. + I PN
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 I PN )
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 .
Page 9/12
070615/8
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
www .lem.com
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