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24February2017/Version 9

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

www.lem.com

N° 97.34.19.000.0

Current Transducer LAH 25-NP

For the electronic measurement of currents: DC, AC, pulsed...,

with galvanic separation between the primary circuit and the secondary

circuit.

Electrical data

I

P N

Primary nominal RMS current

25

At

I

P M

0 … ±55

At

R

M

T

T

R

R

with ±12 V

@ I

0

284

0

280 Ω

@ I

3)

0

182

0

178 Ω

with ±15 V

@ I

67

398

70

394 Ω

@ I

3)

67

263

70

259 Ω

@ I

4)

I

S N

Secondary nominal RMS current

25

mA

K

N

Conversion ratio

1-2-3 : 1000

U

C

Supply voltage (±5 %)

±12 … 15

V

I

C

Current consumption

10 (@ ±15 V) +I

S

mA

Accuracy - Dynamic performance data

X

±0.3

%

ε

L

Linearity error

< 0.2

%

Typ Max

I

O

Offset current @ I

±0.15

mA

I

O M

Magnetic offset current @ I

and specified R

±0.20 ±0.25

mA

I

O T

Temperature variation of I

±0.10 ±0.60

mA

−25 °C … +85 °C

±0.10 ±0.70

mA

t

ra

Reaction time to 10 % of I

P N

< 200

ns

t

r

P N

< 500

ns

BW

Frequency bandwidth (−1 dB)

DC … 200

kHz

General data

T

A

Ambient operating temperature

−25 … +85

°C

T

S

Ambient storage temperature

−40 … +90

°C

R

S

Resistance of secondary winding @ T

72

Ω

@ T

76

Ω

m

Mass

20

g

Standards

EN 50178: 1997

2)

Calculation of R

@ 70 °C and the maximum power of the transistors = 0.302 W @ 85 °C

3)

Sinusoidal wave 50 Hz

4)

The minimum measuring resistance R

(see “LAH technical information” leaflet)

5)

Without I

6)

With a di/dt of 100 A/µs.

I

8-12-25 A

Features

● Closed loop (compensated) multi-

range current transducer using

the Hall effect

● Printed circuit board mounting

● Insulating plastic case recognized

according to UL 94-V0.

Advantages

● Excellent accuracy

● Very good linearity

● Low temperature drift

● Optimized response time

● No insertion losses

● High immunity to external

interference

● Current overload capability.

Applications

● AC variable speed drives and

servo motor drives

● Static converters for DC motor

drives

● Battery supplied applications

● Uninterruptible Power Supplies

(UPS)

● Switched Mode Power Supplies

(SMPS)

● Power supplies for welding

applications.

Application domain

● Industrial.