DCM 305 E Earth Leakage Clamp Meter Ian

DCM 305 E Earth Leakage Clamp Meter Ian Bensted Applications Engineer ian. bensted@megger. com 1

DCM 305 E Earth Leakage Clamp n n n n n 2 0. 001 m. A 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)

DCM 305 E TRMS Current Ranges n n 3 6 m. A, 600 m. A, 60 A, 100 A (AC) Manual or Auto ranging 0. 001 m. A resolution (6 m. A 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

DCM 305 E Power On / Battery Check Power On 4 n Display of battery condition at switch on n Full battery = 100 % n Battery replacement = 1 %

DCM 305 E Display Hold Features Hold Selection 5 n n Data Hold Freezes display readings Auto Hold Automatically freezes display readings n Peak Hold n Maintains highest current reading

DCM 305 E Low Pass Filter Cut-off frequency Mains Supply Frequency 6 Unwanted (Harmonic) Frequencies n Wide response (all frequencies) n 50 -60 Hz response (low pass filter) n Low pass filters pass frequencies lower than cut-off frequency and attenuate frequencies above the cut-off frequency n Filters out high frequency harmonics to enable stable measurements n Cut-off frequency 100 Hz n Attenuation characteristic -24 d. B / octave

DCM 305 E Compare feature Compare Feature Compare Limit Selection 7 n Selectable limit values 0. 25 m. A, 0. 5 m. A, 3. 5 m. A n Clamp compares measured current with chosen limit value n Buzzer activates and display flashes when limit exceeded

DCM 305 E Range Selection 8 n Autorange n 6 m. A, 600 m. A, 60 A, 100 A (AC) n Manual n 6 m. A, 600 m. A, 60 A, 100 A (AC)

DCM 305 E Auto Back Light Backlight Sensor 9 n Auto backlight sensor illuminates display automatically in very poorly illuminated locations

DCM 305 E Single Phase Earth Leakage Phase Neutral 10 n Phase & Neutral conductors

DCM 305 E 3 Phase Earth Leakage n 3 Phase conductors L 1 L 2 L 3 11

DCM 305 E 3 Phase + Neutral Earth Leakage n 3 Phase & Neutral conductors L 1 L 2 L 3 N 12

DCM 305 E Earth Conductor Earth Leakage Earth / Ground Conductor 13 n Earth conductor n Will only measure leakage in earth conductor not entire installation

DCM 305 E Load Current n Phase conductor only Neutral Phase 14

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 worldleading 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. 15