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LAX series 16-100 A
Performance parameters definition
The schematic used to measure all electrical parameters is:
(C 1 = C 2 = 100 nF, R M = 50 ? unless otherwise noted):
+V C
This model is valid for primary ampere-turns Θ P between
- Θ Pmaxi and + Θ Pmaxi only.
At zero input current, the model for the offset is reduced to:
I P
+
M
I S
R M
C 1
0V
I S = I OE + I OT (T A ) + I OM ( Θ Pmaxi )
C 2
In which I OM ( Θ Pmaxi ) is the magnetic offset current due to the
maximum input ampere-turns that have been applied to the
transducer.
-
-V C
Sensitivity and linearity
Figure 18: standard characterization schematics
To measure sensitivity and linearity, the primary current (DC) is
The linearity error ε L is the maximum positive or negative
Ampere-turns and amperes
The LAX transducer is sensitive to the primary current linkage
Θ P (also called ampere-turns).
Θ P = N P I P (At)
With N P the number of primary turn (1, 2 or 3
cycled from 0 to I P , then to -I P and back to 0 (equally spaced I P /
10 steps).
The sensitivity G is defined as the slope of the linear regression
line for a cycle between ± I PN .
difference between the measured points and the linear regression
line, expressed in % of the maximum measured value.
Magnetic offset
depending on the connection of the primary jumpers)
The magnetic offset current I OM is the consequence of a current
Is ( t 1 ) ? Is ( t 2 )
I =
2
Warning : As most LAX user will use it with only one single
primary turn (N P = 1), most of this datasheet is written with
primary currents instead of current linkages. The unit is kept as
ampere-turn (At) to make clear that ampere-turns are meant.
Transducer simplified model
The static model of the transducer at temperature T A is:
I S = G Θ P + error
on the primary side ("memory effect" of the transducer's ferro-
magnetic parts). It is included in the linearity figure but can be
measured individually.
It is measured using the following primary current cycle.
I OM depends on the current value I P1 .
OM
In which
error = I OE + I OT (T A ) + ε G Θ P +
ε L ( Θ Pmaxi
) Θ Pmaxi
I P (DC)
I P1
With :
Θ P = N P I P : the input ampere-turns (At)
Please read above warning.
Θ Pmaxi : the maxi input ampere-turns that have
0A
t 1
t 2
t
I S
:
been applied to the transducer (At)
the secondary current (A)
-I P1
t
Ip(3)
T A
I OE
:
:
the ambient temperature (°C)
the electrical offset current (A)
I OT (T A )
temperature T A (A)
:
G :
ε G :
ε L ( Θ Pmaxi ) :
the temperature variation of I at
O
the sensitivity of the transducer (A/At)
the sensitivity error
the linearity error for Θ Pmaxi
Figure 19: current cycle used to measure magnetic and
electrical offset (transducer supplied)
Page 8/12
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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