Current Transducer LAH 25-NP
For the electronic measurement of currents: DC, AC, pulsed ...,
with a galvanic isolation between the primary circuit
(high power) and the secondary circuit (electronic circuit).
16038
Electrical data
I PN = 8-12-25 A
I PN
Primary nominal current rms
25
At
Features
I PM
R M
Primary current, measuring range
Measuring resistance @ 2)
1)
0 .. 55
T A = 70°C T A = 85°C
At
? Closed loop (compensated) multi-
R M mini R M maxi R M mini R M maxi
range current transducer using the
with ± 12 V
with ± 15 V
@
@
@
@
I PN [± At DC ]
I PN [At RMS ] 3)
I PN [± At DC ]
I PN [At RMS ] 3)
0
0
67
67
284
182
398
263
0
0
70
70
280
178
394
259
?
?
?
?
Hall effect
? Printed circuit board mounting
? Insulated plastic case recognized
according to UL 94-V0.
I P < I PN 4)
I SN
@
Secondary nominal current rms
25
mA
Advantages
ε
Temperature variation of I O
K N
V C
I C
X
L
I O
I OM
I OT
Conversion ratio
Supply voltage (± 5 %)
Current consumption
Accuracy - Dynamic performance data
Accuracy 5) @ I PN, T A = 25°C
Linearity error
Offset current @ T A = 25°C
Magnetic offset current @ I P = 0 and specified R M ,
after an overload of 5 x I PN
0°C .. + 70°C
- 25°C .. + 85°C
1 - 2 - 3 : 1000
± 12 .. 15 V
10 (@ ± 15V) + I S mA
± 0.3 %
< 0.2 %
Typ Maxi
± 0.15 mA
± 0.20 ± 0.25 mA
± 0.10 ± 0.60 mA
± 0.10 ± 0.70 mA
? Excellent accuracy
? Very good linearity
? Low temperature drift
? Optimized response time
? Wide frequency bandwidth
? No insertion losses
? High immunity to external
interference
? Current overload capability.
Applications
? AC variable speed drives and servo
t r a
t r
di/dt
BW
Reaction time @ 10 % of I PN
Response time 6) to 90 % of I PN step
di/dt accurately followed
Frequency bandwidth (- 1 dB)
< 200
< 500
> 200
DC .. 200
ns
ns
A/μs
kHz
motor drives
? Static converters for DC motor drives
? Battery supplied applications
? Uninterruptible Power Supplies
T A
T S
R S
m
General data
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance
Mass
Standards
@ T A = 70°C
@ T A = 85°C
- 25 .. + 85
- 40 .. + 90
72
76
20
EN 50178: 1997
°C
°C
?
?
g
(UPS)
? Switched Mode Power Supplies
(SMPS)
? Power supplies for welding
applications.
Application domain
Calculation of R M mini with the maxi. power of the transistors = 0.307W
Notes : 1) During 10 s, with R M ≤ 109 ? ( V C = ± 15 V)
2)
@ 70°C and the maxi. power of the transistors = 0.302W @ 85°C
? Industrial.
3)
4)
50 Hz Sinusoidal
The measuring resistance R M mini may be lower
(see "LAH Technical Information" leaflet)
5)
6)
071008/7
Without I O & I O M
With a di/dt of 100 A/μs.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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