Voltage Transducer LV 100
For the electronic measurement of voltages : DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high voltage)
and the secondary circuit (electronic circuit).
Electrical data
I
PN
Primary nominal r.m.s. current
10
mA
I
P
Primary current, measuring range
0 .. 20
mA
R
M
Measuring resistance
R
M min
R
M max
with 15 V
@ 10 mA
max
0
150
@ 20 mA
max
0
50
I
SN
Secondary nominal r.m.s. current
50
mA
K
N
Conversion ratio
10000 : 2000
V
C
Supply voltage (
5
%)
15
V
I
C
Current consumption
10 + I
S
mA
V
d
R.m.s. voltage for AC isolation test
1)
, 50 Hz, 1 mn
6
kV
Accuracy - Dynamic performance data
X
G
Overall Accuracy @ I
PN
, T
A
= 25C
0.7
%
L
Linearity
< 0.1
%
Typ
Max
I
O
Offset current @ I
P
= 0, T
A
= 25C
0.2
mA
I
OT
Thermal drift of I
O
0C .. + 70C
0.2 0.3
mA
t
r
Response time
2)
@ 90 % of V
P max
20 .. 100
s
General data
T
A
Ambient operating temperature
0 .. + 70
C
T
S
Ambient storage temperature
- 25 .. + 85
C
R
P
Primary coil resistance @ T
A
= 70C
1900
R
S
Secondary coil resistance @ T
A
= 70C
60
m
Mass
460
g
Standards
3)
EN 50178
Notes :
1)
Between primary and secondary
2)
R
1
= 100 k
(L/R constant, produced by the resistance and inductance
of the primary circuit)
3)
A list of corresponding tests is available
Features
Closed loop (compensated) voltage
transducer using the Hall effect
Insulated plastic case recognized
according to UL 94-V0.
Principle of use
For voltage measurements, a current
proportional to the measured voltage
must be passed through an external
resistor R
1
which is selected by the
user and installed in series with the
primary circuit of the transducer.
Advantages
Excellent accuracy
Very good linearity
Low thermal drift
Low response time
High bandwidth
High immunity to external
interference
Low disturbance in common mode.
Applications
AC variable speed drives and servo
motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies
(UPS)
Power supplies for welding
applications.
980709/5
I
PN
= 10
mA
V
PN
= 100
..
2500
V
LEM Components
w w w .lem.com
Front view
Left view
Top view
Dimensions LV 100
(in mm. 1 mm = 0.0394 inch)
Remarks
I
S
is positive when V
P
is applied on terminal +HT.
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
Mechanical characteristics
General tolerance
0.3 mm
Fastening
2 holes
6.5 mm
Connection of primary
M5 screw terminals
Fastening torque
2.2 Nm or 1.62 Lb - Ft.
Connection of secondary
Faston 6.3 x 0.8 mm
Secondary terminals
Terminal + : supply voltage + 15 V
Terminal M : measure
Terminal - : supply voltage - 15 V
Connection
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Instructions for use of the voltage transducer model LV 100
Primary resistor R
1
: the transducer's optimum accuracy is obtained at the nominal primary current. As far as possible, R
1
should be
calculated so that the nominal voltage to be measured corresponds to a primary current of 10 mA.
Example: Voltage to be measured V
PN
= 1000 V
a) R
1
= 100 k
/40 W, I
P
= 10 mA
Accuracy = 0.7 % of V
PN
(@ T
A
=
+25C)
b) R
1
= 400 k
/ 5 W, I
P
= 2.5 mA
Accuracy = 2.5 % of V
PN
(@ T
A
=
+25C)
Operating range (recommended) : taking into account the resistance of the primary windings (which must remain low compared to R
1,
in order
to keep thermal deviation as low as possible) and the isolation, this transducer is suitable for measuring nominal voltages from 100 to 2500 V.
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