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ManyPower Applicationsrequire current measurement levels above the maximum internal measurement capability of a power analyzer. N4L has partnered with LEM of Switzerland to develop a range of interfaces that provide accurate, reliable and easy-to-implement high-current measurement solutions.
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Configure your current measurement solution in 3 simple steps...
Step 1:
Define your current level, required number of phases and select your LEM sensor
Step 2:
Select your interface...
LEM6
LEM1
3~6 phase (if single sensor power requirement is <20W AC / <30W DC - check diagram below)
1~6 phase (or if single sensor power requirement is >20W AC / >30W DC - check diagram below)
...your solution is complete
...select the appropriate LEM-1 power module in Step 3.
Step 3:
Select LEM-1 power module (only for LEM-1 interface)
Long cable length?
For cables up to 18M, ourinterface option selection guideexplains the best solution
Your complete current measurement solution
Through the above selection process, you will create a high-precision current measurement solution that can connect directly to ourprecision power analyzerconnection. You will select a LEM6 + up to 6 compatible LEM sensors, or a LEM-1 + LEM50/LEM150 power module + LEM sensor.
LEM-1 Interface Product Overview
The N4L LEM-1 interface module serves as a high-precision, highly stable interface unit that allows any N4L PPA to be simply "plug and play" connected to LEM IT and ITN current sensors. The LEM-1 provides a highly stable isolated supply voltage for LEM sensors, delivering excellent cross-channel coupling immunity. If one or more LEM-1 interface modules are purchased along with an N4L power analyzer and LEM sensors, the LEM-1 interface can be used in N4L'sISO17025 UKASPerform "system calibration" in the lab. This provides engineers with a single uncertainty figure and improved accuracy performance.
Documentation
LEM-1 interface modulePDF， 115kb
Current Sensor Interface Options – Selection GuidePDF， 750kb
LEM-1 power module product description
The LEM-1 power module is available in two models. For example, the low-power 50W module can power up to 6 IT65-S sensors or 3 IT700-S sensors. There is also a 120W power module that can power up to 6 IT900-S or 2 IN2000-S sensors. The LEM-1 power module not only provides convenience but also provides stable power to LEM sensors. There is a universal input rated from 90~264Vrms, 47~63Hz. The 50W LEM power module outputs +/-15V and continuously supplies up to 1.67A, while the 120W LEM power module outputs 4A continuously.
Specifications
| 50W LEM power module | 120W LEM module | |
|---|---|---|
| Power Output | 604 | 120W |
| Input voltage | 90~264Vrms | 90~264Vrms |
| Output voltage | DC +/- 15V | DC +/- 15V |
| Output current | 1.67A continuous current | 4A Continuous Current |
| Overload Capability | Continuous rating x2, 100ms duration – 10% duty cycle | Continuous rating x2, 100ms duration – 10% duty cycle |
| Output protection | Short-circuit protection with foldback – auto recovery | Short-circuit protection with foldback – auto recovery |
| Typical efficiency | >85% @ full load | 85% @ full load |
LEM-6 interface
The LEM-6 interface is a dedicated solution for multiphase high-current power measurement applications. LEM-6 can provide 3~6 phase configurations, supporting up to 707Arms (1000Apk). LEM-6 has 4 calibrated load resistors to ensure maximum possible accuracy of LEM sensors over a wide dynamic range. LEM6 can be mounted in a 19-inch rack, and each input channel is equipped with a dedicated low-noise isolated PSU.
LEM-6 specifications
| Parameters | Specifications |
| No. of channels | 3~6 |
| LEM sensor supply voltage | +/- 15V |
| LEM sensor maximum supply current | +/- 1 Asia-Pacific Point |
| Output Voltage @ BNC Connector | +/- 3Vpk maximum |
| No. Range | 4 |
| Range | 1Ω, 2.5Ω, 5Ω, 10Ω |
| Accuracy | 0.1% (0.04% after system calibration) |
| Guarantee | 3 years |
