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26October2015/Version 5

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

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LF 210-S

50

100

150

200

250

300

350

400

450

0

50

100

150

200

250

200 A, 73 Ω

200 A, 102 Ω

Rmax Uc= 11.4 V @ 70 °C

Rmax Uc= 14.25 V @ 70 °C

10

0

10

1

10

2

10

3

10

4

10

5

10

6

10

7

10

−5

10

−4

10

−3

10

−2

10

−1

Total RMS noise current in the frequency range [1...10] MHz

Figure 1: Maximum measuring resistance

I

P

R

U

×

Figure 3: Typical noise voltage density e

no

with R

Figure 4: Typical total output current noise with

(primary referred, rms) with R

To calculate the noise in a frequency band f

is:

with I

Example:

Figure 4 gives I

3

Hz) = 3.19 mA and I

6

Hz) = 84.4mA.

The output current noise (rms) is therefore:

I

I

2

− I

2

Figure 2: Typical step response (0 to 200 A, 75 A/µs R

Typical performance characteristics

10

0

10

1

10

2

10

3

10

4

10

5

10

6

10

7

−165

−160

−155

−150

−145

−140

−135

−130

−125

−120

−115

Noise Voltage Spectral Density

50

100

150

200

250

300

350

400

450

0

50

100

150

200

250

200 A, 72Ω

200 A, 100 Ω

200 A, 23 Ω

Rmax Uc= 11.4 V @ 85 °C

Rmax Uc= 14.25 V @ 85 °C

Rmin Uc= 15.75 V @ 85 °C

0

10

20

30

40

50

60

70

Time (µs)

Input 100 A /div

Output 50 mA/div