LF510-S Datasheet, PDF (6/7 Pages) LEM – Bipolar and insulated current measurement up to 0.8 kA

Typical performance characteristics
LF 510-S
6
3
0
-3
-6
-9
-12
-15
-18
-21
-24
1
10
100
Frequency (kHz)
1000
90
45
0
-45
-90
1
10
100
Frequency (kHz)
1000
Figure 5: Typical frequency response, small signal bandwidth
Performance parameters definition
Sensitivity and linearity
To measure sensitivity and linearity, the primary current (DC) is
cycled from 0 to I_PM, then to −I_PM 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.
Overall accuracy
The overall accuracy X_G is the error at ±I_PN, 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 t_ra are shown in the
next figure.
Both slightly depend on the primary current di/dt. They are
measured at nominal current.
I
100 %
90 %
I_P
10 %
I_S
t_r
t_ra
t
Figure 6: Response time t_r and reaction time t_ra
19November2015/Version 7
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
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