Datasheet

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LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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Dimensions LV 25-P (in mm. 1 mm = 0.0394 inch)
Connection
Right view
Bottom view Top view
Back view
Mechanical characteristics
• General tolerance ± 0.2 mm
• Fastening & connection of primary 2 pins
0.635 x 0.635 mm
• Fastening & connection of secondary 3 pins ∅ 1 mm
• Recommended PCB hole 1.2 mm
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.
Instructions for use of the voltage transducer model LV 25-P
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
= 250 V a) R
1
= 25 kΩ / 2.5 W, I
P
= 10 mA Accuracy = ± 0.9 % of V
PN
(@ T
A
= + 25°C)
b) R
1
= 50 kΩ / 1.25 W, I
P
= 5 mA Accuracy = ± 1.5 % of V
PN
(@ T
A
= + 25°C)
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 10 to 500 V.