CW-401 MkII

Current clamp meter with CAN-Interface

The CW-401 MkII is an extremely precise clamp meter designed for contactless current measurements across the measurement ranges ±10 A, ±30 A, ±50 A and ±150 A. Thanks to its premium, user-friendly finish and compact size the clamp meter is particularly suitable for use in difficult conditions and inaccessible places, for example in engine compartments. Intelligent temperature compensation ensures the clamp meter supplies precision measured values even in high ambient temperatures up to +120 °C. This is achieved by digitally processing the measured values in a microprocessor.

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Main Features

  • Versions for the measurement ranges: ±10 A, ±30 A, ±50 A and ±150 A
  • Accuracy 1% ±50 mA (relative to measurement range)
  • Temperature range: -40 °C to +120 °C
  • Temperature compensation, sensor position- and magnetic remanence correction 
  • Measured value output via CAN bus 2.0 A/B (ISO 11898-2)
  • Robust aluminium housing
  • Small form factor makes it possible to reach even difficult-to-access measuring points
  • Calibrated inhouse  (DAkkS – German accreditation body – on request)  
  • Intuitive configuration software 

Measuring ranges: ±10 A / ±30 A / ±50 A/ ±150 A

User-friendly read out of measured current values via CAN bus. That allows the measured values to be transmitted interference-free to any desired evaluation unit including over large distances. In conjunction with the CW-101 CAN USB interface it is possible to configure a clamp meter via CAN bus. That means with the aid of the intuitive configuration software it is very easy to define the output transmission rate, CAN ID, bit rate, mean value generation and more. Moreover, it is possible to configure several clamp meters at the same time and export a DBC file, for example for use in a measuring chain.

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Configuration software CW-969

With the intuitive software, several current clamps can be configured for their measuring task simultaneously. 


  • Configuration of CAN ID, sample rate and CAN-bus data rate
  • Assignment of signal names
  • Zero-Point Adjustment
  • Read out of latest calibration data
  • DBC-File Export
  • Sample Averaging
  • Offline Configurations
  • Save/Open of configuration files


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Technical Data


Measurement range:  ±10 A, ±30 A, ±50 A, ±150 A 
Resolution: 1 mA 
Accuracy: 1 % ± 50 mA (relative to measurement range)
Output rate: Max. 2 kHz, configurable
Measurement category:  CAT I (measuring voltage max. 48 V)
Value averaging: Configurable


Number: 1
Type: ISO 11898-2 (high-speed)
CAN-protocoll versions 2.0 A and 2.0 B
Bitrate: High-speed up to 1 Mbit/s
Connectors: 4 pin LEMO, suitable connection cables on request


Supply voltage: 9 VDC to 30 VDC
Current consumption: 40 mA at 12 VDC

Environmental conditions

Temperature range: -40 °C to +120 °C
Protection class: IP65


Housing: Robust aluminium case
Dimensions (LxWxH): 59 mm x 32 mm x17,5 mm
Diameter: 6,1 mm 
Weight: Approx. 100 g
Factory calibration: Standard: -20 °C to 110 °C
Extended: -40 °C to 120 °C
DAkkS-calibration on request 
  • Offset-calibration over CAN-bus
  • Automatic remanence correction
  • Integrated temperature measurement
  • Output of measuring values over CAN-Bus 2.0
  • Intuitive configuration software
  • IPEmotion PlugIn (In preparation) 


Datasheet CW-401 MkII Current Clamp

Download (PDF)