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Voltage Transducer LV 25-P
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).
IPN = 10 mA VPN = 10 .. 500 V
Electrical data
I PN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance with 12 V with 15 V ISN KN VC IC Vd @ 10 mA max @ 14 mA max @ 10 mA max @ 14 mA max 10 mA 0 .. 14 mA R M min R M max 30 30 100 100 190 100 350 190
Features
*Closed loop (compensated) voltage
transducer using the Hall effect
*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 1), 50 Hz, 1 mn
25 mA 2500 : 1000 12 .. 15 V 10 (@ 15 V) + IS mA 2.5 kV
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.
Accuracy - Dynamic performance data
XG Overall Accuracy @ IPN , TA = 25C Linearity Offset current @ IP = 0, TA = 25C Thermal drift of IO Response time 2) @ 90 % of VP max @ 12 .. 15 V @ 15 V ( 5 %) 0.9 0.8 < 0.2 Max 0.15 0.06 0.25 0.10 0.35 40 Typ % % % mA mA mA s
Advantages
*Excellent accuracy *Very good linearity *Low thermal drift *Low response time *High bandwidth *High immunity to external
interference
L
IO IO T tr
0C .. + 25C + 25C .. + 70C
General data
TA TS RP RS m Ambient operating temperature Ambient storage temperature Primary coil resistance @ TA = 70C Secondary coil resistance @ TA = 70C Mass Standards 3) 0 .. + 70 - 25 .. + 85 250 110 22 EN 50178 C C g
*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. Notes :
1) 2)
3)
Between primary and secondary R 1 = 25 k (L/R constant, produced by the resistance and inductance of the primary circuit) A list of corresponding tests is available
981125/14
LEM Components
w w w .lem.com
Dimensions LV 25-P
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 + 12 .. 15 V Terminal M : measure Terminal - : supply voltage - 12 .. 15 V
Connection
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
Remarks
*IS is positive when VP 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' optimum accuracy is obtained at the nominal primary current. As far as possible, R 1 should be s calculated so that the nominal voltage to be measured corresponds to a primary current of 10 mA. Example: Voltage to be measured VPN = 250 V a) R 1 = 25 k / 2.5 W, IP = 10 mA b) R 1 = 50 k / 1.25 W, IP = 5 mA Accuracy = 0.8 % of VPN (@ TA = + 25C) Accuracy = 1.6 % of VPN (@ TA = + 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 10 to 500 V.
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.

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