BENNING - Testing measuring and safety equipment, Earth measuring clamp BENNING CM E1
Brand: BENNING
Model No: BENNING CM E1
$0.00
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 range | 9,999 |
Basic accuracy | 1% |
AC voltage | - |
DC voltage | - |
AC current | 0.3 mA - 35 A |
DC current | - |
Resistance | RE-loop 0.025 Ω – 1500 Ω |
Continuity / diode | - |
Frequency | - |
Capacity | - |
Memory / data log | HOLD, REC (116 measured values) |
Measuring method | TRUE RMS |
Max. clamp opening | 38 mm |
Measuring category | CAT III 300 V |
Item No. | 044684 |