1. DCM305E Earth Leakage Clamp Meter
Ian Bensted
Applications Engineer

2. DCM305E Earth Leakage Clamp
0.001 mA resolution
Up to 100 A AC
TRMS reading
Low pass filter to aid stability of readings
Auto, data & peak hold
Compare feature
40 mm jaw
Auto back light
Auto power off (switchable)

3. DCM305E TRMS Current Ranges
6 mA, 60 mA, 600 mA, 6 A, 60 A, 100 A (AC)
Manual or Auto ranging
0.001 mA resolution (6 mA range)
TRMS meters allow accurate measurements on both pure, undistorted, sinusoidal AC waveforms and non-sinusoidal AC waveforms which can contain triangles, pulse trains and other ragged waves

4. DCM305E Power On / Battery Check
Display of battery condition at switch on
Full battery = 100 %
Battery replacement = 1 %
Power On

5. DCM305E Display Hold Features
Data Hold
Freezes display readings
Auto Hold
Automatically freezes display readings
Peak Hold
Maintains highest current reading
Hold
Selection

6. DCM305E Low Pass Filter Wide response (all frequencies)
50-60 Hz response (low pass filter)
Low pass filters pass frequencies lower than cut-off frequency and attenuate frequencies above the cut-off frequency
Filters out high frequency harmonics to enable stable measurements
Cut-off frequency 100 Hz
Attenuation characteristic -24 dB / octave
Cut-off frequency
Mains
Supply
Frequency
Unwanted
(Harmonic)
Frequencies
Frequency

7. DCM305E Compare feature
Selectable limit values 0.25 mA, 0.5 mA, 3.5 mA
Clamp compares measured current with chosen limit value
Buzzer activates and display flashes when limit exceeded
Compare
Feature
Compare
Limit Selection

8. DCM305E Range Selection Autorange
6 mA, 60 mA, 600 mA, 6 A, 60 A, 100 A (AC)
Manual
Range
Selection

9. DCM305E Auto Back Light
Auto backlight sensor illuminates display automatically in very poorly illuminated locations
Backlight
Sensor

10. DCM305E Single Phase Earth Leakage
Phase & Neutral conductors
Phase
Neutral

11. DCM305E 3 Phase Earth Leakage
3 Phase conductors L1 L2 L3

12. DCM305E 3 Phase + Neutral Earth Leakage
3 Phase & Neutral conductors L1 L2 L3 N

13. DCM305E Earth Conductor Earth Leakage
Will only measure leakage in earth conductor not entire installation
Earth / Ground
Conductor

14. DCM305E Load Current
Phase conductor only
Neutral
Phase

15. Questions? Power on At Megger, we understand that keeping the power on is essential for the success of your business. That is why we are dedicated to creating, designing and manufacturing safe, reliable, easy-to-use portable test equipment backed by world-leading support and expertise. We can assist your acceptance, commissioning and maintenance testing for predictive, diagnostic or routine purposes. By working closely with electrical utilities, standards bodies and technical institutions, we contribute to the dependability and advancement of the electrical supply industry.