Quiescent current measurement

The CW-425 offers a simple possibility to obtain highly precise measurements of the no-load and working currents of devices. The CW-425 offers a total measurement range of ±150 A, divided into three measurement ranges. It is possible to switch from one measurement range to the other virtually seamlessly within a maximum of 2 µs during ongoing operations.

The measured values are transmitted via a CAN interface. Devices settings such as baud rate of the CAN bus and output transfer rate can easily be configured via CAN messages. It is possible to read in a description file (dbc file) in software tools to display the measured values. The insulation voltage of up to 1000 VDC between the measuring circuit and the control circuit offers sufficient protection for other devices in the control circuit. 

The module is available as a favourably priced top-hat rail version as well as in a rugged desktop housing that offers a higher protection class.

The CW-425 is destined for automated measurement of no-load and working currents of control units, for example in automotive environments. At the same time the CW-425 is an ideal supplement for our CW-300 series designed for test bench applications.



  • Single device to measure no-load and working current
  • Measurement range from ±150 A
  • Accuracy of 0,04 % in lower measurement range
  • Dynamic, seamless changeover of measurement channels
  • Control via CAN bus
  • Top-hat rail housing and rugged desktop housing available

Current measurement channel

Quantity 1
Measurement range ±150 A (total)
Deviation 0 µA to 10 mA 0,04 % relative to 10 mA 
Deviation 10 mA to 100 mA 0,06 % relative to 100 mA   
Deviation 100 mA to 1 A 0,30 % relative to 1 A
Deviation 1 A to 10 A 0,30 % relative to 10 A
Deviation from 10 A 0,25 % to the measured value
Connector Thread shaft M6
Measuring range switch-over Automatic switch-over between measurement ranges in 2 μs 


Quantity 1
Type ISO 11898-2 (high-speed)
CAN protocol versions 2.0 A and 2.0 B
Data rate up to 8 Mbit/s
Termination 120 Ω, optional activation via Jumper 
Connector Phoenix-connector MC 1,5/2-ST-3,81 (2-pin) 

power supply

Supply voltage: 12 VDC to 24 VDC
Current consumption: 85 mA at 12 VDC
Connector: Phoenix-connector MC 1,5/3-ST-3,81 (3-pin) 

Environmental conditions

Temperature range operation: -20 °C to +65 °C 
Temperature range storage: -20 °C to +85 °C 
Relative humidity: 35 % to 85 % non-condensing

General information

Housing: 45 mm DIN-Top-hat rail housing, optional rugged desktop housing 
Dimensions (LxWxH): 126 mm x 110 mm x 35 mm
Weigth: 180 g
Calibration: DAkkS-Calibration on request


Datasheet CW-425

Download (PDF)

Back to the Overview | CW-400 Series