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BENNING - Testing measuring and safety equipment, Earth measuring clamp BENNING CM E1

BENNING - Testing measuring and safety equipment, Earth measuring clamp BENNING CM E1

Brand: BENNING
Model No: BENNING CM E1
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Measuring functions

  • earth loop resistance measurement RE in multiply earthed earthing systems
  • measurement of leakage and load currents from 0.3 mA to 35 A using the TRUE RMS measuring method

 

Features

  • precise due to TRUE RMS measuring method (AC, AC+DC)
  • optical and acoustic alarm function in case of excessive earthing resistances
  • large measuring clamp diameter of 38 mm
  • memory of measured values/data logger for 116 measurements
  • automatic calibration during start-up
  • measuring category CAT III 300 V
  • supplied in a hard-top case and with reference resistance loop

 

Functional principle

  • The measuring clamp has an excitation winding and a sensor winding.
  • The excitation winding induces a current flow in the clamped earthing conductor via a constant AC voltage U (f = 3.333 kHz).
  • The sensor winding measures the induced current flow.
  • The BENNING CM E1 measures (calculates) the resistance of the entire earth loop Rs = U / I.

 

Advantage of earth resistance measurement without using rods

  • no need to disconnect the earthing conductor (often difficult because of corrosion)
  • no need to install probes/auxiliary earth electrodes
  • quick and easy measurement
  • safe both for the testing personnel and the electrical installation (earthing is maintained during measurement)
  • no failures of the electrical installation due to disconnection of the earth connection

 

Typical fields of application

electrical installations with parallel earth connections

  • overhead line networks with pole-type earth electrodes
  • lightning protection systems of buildings
  • street lighting, telecom applications, wind energy

 

Specification

 BENNING CM E1
Indicating range9,999
Basic accuracy1%
AC voltage - 
DC voltage - 
AC current0.3 mA - 35 A
DC current - 
ResistanceRE-loop 0.025 Ω – 1500 Ω
Continuity / diode - 
Frequency - 
Capacity - 
Memory / data logHOLD, REC (116 measured values)
Measuring methodTRUE RMS
Max. clamp opening38 mm
Measuring categoryCAT III 300 V
Item No. 044684