Current Transducer LA 25-NP/SP14
For the electronic measurement of currents : DC, AC, pulsed,
mixed, with a galvanic isolation between the primary circuit
(high power) and the secondary circuit (electronic circuit).
I
PN
=
0.25 A
16094
Electrical data
I
PN
I
P
R
M
Primary nominal r.m.s. current
Primary current, measuring range
Measuring resistance
with ± 15 V
I
SN
K
N
V
C
I
C
V
d
V
b
@ ± 0.25 A
max
@ ± 0.36 A
max
0.25
0 .. ± 0.36
R
M min
R
M max
100
100
320
190
A
A
Ω
Ω
mA
V
mA
kV
V
V
Features
•
Closed loop (compensated) multi-
turns current transducer using the
Hall effect
•
Printed circuit board mounting
•
Insulated plastic case recognized
according to UL 94-V0.
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (± 5 %)
Current consumption
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
R.m.s. rated voltage
1)
, safe separation
basic isolation
25
100 : 1000
± 15
10 +
I
S
2.5
600
1700
Special features
•
•
•
•
I
PN
I
P
K
N
T
A
=
=
=
=
0.25 A
0 .. ± 0.36 A
100 : 1000
- 10°C .. + 70°C.
Accuracy - Dynamic performance data
X
ε
L
Typical accuracy @
I
PN
,
T
A
= 25°C
Linearity error
Offset current @
I
P
= 0,
T
A
= 25°C
Residual current
3)
@
I
P
= 0, after an overload of 3 x
I
PN
Thermal drift of
I
O
- 10°C .. + 70°C
Response time
4)
@ 90 % of
I
PN
Frequency bandwidth (- 1 dB)
2)
± 0.5
< 0.2
Typ
± 0.05
± 0.05
± 0.10
Max
± 0.15
± 0.15
± 0.35
%
%
mA
mA
mA
µs
kHz
Advantages
•
•
•
•
•
•
•
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.
I
O
I
OM
I
OT
t
r
f
<1
DC .. 150
General data
Applications
T
A
T
S
R
P
R
S
L
P
R
IS
m
Ambient operating temperature
Ambient storage temperature
Primary coil resistance @
T
A
= 25°C
Secondary coil resistance @
T
A
= 70°C
Primary insertion inductance
Isolation resistance @ 500 V,
T
A
= 25°C
Mass
Standards
- 10 .. + 70
°C
- 25 .. + 85
°C
< 860
m
Ω
110
Ω
496
µH
> 1500
MΩ
22
g
EN 50178 : 1997
•
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.
Notes :
1)
2)
3)
4)
Pollution class 2
Measurement carried out after 15 mn functioning
The result of the coercive field of the magnetic circuit
With a di/dt of 100 A/µs.
060405/4
LEM
w w w .lem.com
Dimensions LA 25-NP/SP14
Bottom view
(in mm. 1 mm = 0.0394 inch)
Right view
Top view
swiss
made
Standard 00
or N° SP..
Year
Week
Secondary terminals
Terminal + : supply voltage + 15 V
Terminal M : measure
Terminal - : supply voltage - 15 V
Connection
in
out
Back view
Mechanical characteristics
•
General tolerance
•
Fastening & connection of primary
± 0.2 mm
2 pins
0.635 x 0.635 mm
•
Fastening & connection of secondary 3 pins
∅
1 mm
•
Recommended PCB hole
1.2 mm
Remark
•
I
S
is positive when
I
P
flows from terminal + to terminal -.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Analog electronics
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