Many power applications require current measurement levels above the maximum internal measurement capabilities of a power analyzer. In partnership with LEM Switzerland, N4L have developed a range of interfaces which provide accurate, reliable and simple to implement high current measurement solutions.
Configure your current measurement solution in 3 simple steps...
Define your current levels, number of phases required and select your LEM transducers
Choose you interface...
3~6 Phases (if individual transducer power requirement is <20W AC / <30W DC - check graph below)
1~6 Phases (or if individual transducer power requirement is >20W AC / >30W DC - check graph below)
...your solution is complete
...select a Suitable LEM-1 Power module in Step 3.
Select LEM-1 Power Module (For LEM-1 Interface only)
Long Cable Lengths?
Your Complete Current Measurement Solution
From the selection process described above, you will have created a high accuracy current measurement solution which can be directly interfaced with one of our Precision Power Analyzers. You will have selected a LEM6 + up to 6 compatible LEM transducers, or a LEM-1 + LEM50/LEM150 Power Module + LEM transducers.
LEM-1 Interface Product Overview
N4L LEM-1 Interface module serves as a high accuracy, highly stable interfacing unit allowing simple “plug and play” connection of any N4L PPA to the LEM IT and ITN current transducers. The LEM-1 supplies the LEM transducer with a highly stable isolated supply voltage, providing excellent cross channel coupling immunity. If one or more of the LEM-1 interface module is purchased with an N4L power analyzer and LEM transducers, the LEM-1 Interface can be “system calibrated” within N4L’s ISO17025 UKAS laboratory. This provides the engineer with a single uncertainty figure and improved accuracy performance.
LEM-1 Interface Module PDF, 115kb
LEM-1 Power Module Product Description
The LEM-1 power modules are available in two variants. A lower power 50W module which will power up to 6x IT65-S transducers or 3x IT700-S transducers, for example. There is also a 120W power module which will power up to 6x IT900-S or 2x IN2000-S transducers, for example. The LEM-1 Power Module offers not only convenience, it also provides a stable power source for the LEM transducers. There is a universal input, rated from 90~264Vrms, 47~63Hz. The output of the 50W LEM Power Module is a +/-15V supply delivering up to 1.67A continuously, the 120W LEM Power Module will output 4A continuously.
|50W LEM Power Module||120W LEM Power Module|
|Output Voltage||DC +/- 15V||DC +/- 15V|
|Output Current||1.67A Continuous||4A Continuous|
|Overload Capacity||Continuous rating x2 for 100ms – 10% duty cycle||Continuous rating x2 for 100ms – 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|
The LEM-6 interface is a dedicated solution for multi-phase high current power measurement applications. The LEM-6 can be supplied in 3~6 phase configurations supporting up to 707Arms (1000Apk). Featuring 4 calibrated burden resistances, the LEM-6 ensures maximum possible accuracy is achieved from the LEM sensor over a wide dynamic range. The LEM6 is 19in rack mountable with each input channel being equipped with a dedicated low noise isolated PSU.
|No. of channels||3~6|
|LEM Transducer supply voltage||+/- 15V|
|LEM Transducer maximum supply current||+/- 1Apk|
|Output voltage @ BNC connector||+/- 3Vpk max|
|No. of ranges||4|
|Ranges||1Ω, 2.5Ω, 5Ω, 10Ω|
|Accuracy||0.1% (0.04% once system calibrated)|