Current Transducer LKSR series
The LKSR series are closed-loop multi-range current transducers with voltage output, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic separation between primary and secondary circuits. They feature a unipolar supply voltage, compact design for PCB mounting, very low offset drift, and good dv/dt immunity. The LKSR series is compatible with the CKSR footprint and offers an extended measuring range for unipolar measurements. Applications include AC variable speed 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, and solar inverters. These transducers are intended for industrial applications.
Product Attributes
- Brand: LEM
- Certifications: IEC 61800 series, IEC 62109-1, IEC 62477-1, UL 508, CSA C22.2 NO. 14-10
- Application Domain: Industrial
Technical Specifications
| Parameter | Symbol | Unit | LKSR 6-NP | LKSR 15-NP | LKSR 25-NP | Comment |
|---|---|---|---|---|---|---|
| Primary nominal RMS current | IP N | A | 6 | 15 | 25 | Apply derating according to fig. 21, 22, 23 |
| Primary current, measuring range | IP M | A | 20 to 20 | 51 to 51 | 85 to 85 | |
| Number of primary turns | NP | 1, 2, 3, 4 | 1, 2, 3, 4 | 1, 2, 3, 4 | ||
| Supply voltage | UC | V | 4.75 to 5.25 | 4.75 to 5.25 | 4.75 to 5.25 | |
| Current consumption | IC | mA | 17 + (NS/2000) | 17 + (NS/2000) | 17 + (NS/2000) | NS = 2000 turns |
| Reference voltage @ IP = 0 A (Internal) | Vref | V | 2.485 to 2.515 | 2.485 to 2.515 | 2.485 to 2.515 | |
| External reference voltage | Vref | V | 0.5 to 2.75 | 0.5 to 2.75 | 0.5 to 2.75 | |
| Output voltage | Vout | V | 0.25 to 4.75 | 0.25 to 4.75 | 0.25 to 4.75 | with UC = +5 V |
| Output voltage @ IP = 0 A | Vout | V | Vref | Vref | Vref | |
| Electrical offset voltage | VO E | mV | 5 to 100 | 1.75 to 1.75 | 1 to 1 | 100 % tested |
| Electrical offset current referred to primary | IO E | mA | 48 to 48 | 42 to 42 | 40 to 40 | 100 % tested |
| Temperature coefficient of Vref @ IP = 0 A | TCVref | ppm/K | 70 | 70 | 70 | Internal reference |
| Temperature coefficient of Vout @ IP = 0 A | TCVout | ppm/K | 14 ppm/K of 2.5 V | 6 ppm/K of 2.5 V | 4 ppm/K of 2.5 V | 40 C 105 C |
| Theoretical sensitivity | Gth | mV/A | 104.2 | 41.67 | 25 | 625 mVIP N |
| Sensitivity error | G | % | 0.2 to 0.2 | 0.2 to 0.2 | 0.2 to 0.2 | 100 % tested |
| Temperature coefficient of G | TCG | ppm/K | 40 | 40 | 40 | 40 C 105 C |
| Linearity error | L | % of IP N | 0.1 to 0.1 | 0.1 to 0.1 | 0.1 to 0.1 | |
| Magnetic offset current (10 IP N) referred to primary | IO M | mA | 25 to 25 | 45 to 45 | 60 to 60 | |
| Output RMS voltage noise spectral density (100 100 kHz) referred to primary | eno | V/Hz | 7 | 3.5 | 1.8 | |
| Output voltage noise (DC 10 kHz) | Vno | mVpp | 10.5 | 4.5 | ||
| Output voltage noise (DC 100 kHz) | Vno | mVpp | 13.4 | 5.7 | ||
| Output voltage noise (DC 1 MHz) | Vno | mVpp | 13.6 | 6.3 | ||
| Reaction time @ 10 % of IP N | tra | s | 0.3 | 0.3 | 0.3 | RL = 1 k, di/dt = 50 A/s |
| Step response time to 90 % of IP N | tr | s | 0.4 | 0.4 | 0.4 | RL = 1 k, di/dt = 50 A/s |
| Frequency bandwidth (1 dB) | BW | kHz | 300 | RL = 1 k | ||
| Frequency bandwidth (3 dB) | BW | kHz | 300 | RL = 1 k | ||
| Overall accuracy | XG | % of IP N | 1.25 | 0.75 | ||
| Overall accuracy @ TA = 85 C (105 C) | XG | % of IP N | 1.25 (1.5) | 0.75 (1) | ||
| Accuracy | X | % of IP N | 0.5 | 0.5 | ||
| Accuracy @ TA = 85 C (105 C) | X | % of IP N | 0.75 (1) | 0.65 (0.75) |
2410311328_LEM-LKSR-50-NP-KIT_C7295782.pdf
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