- Designed for tracing earth leakage faults
- Six TRMS current ranges from 6 mA to 100 A
- Low-pass filter aids stability of readings
- Compare alerts at three preset leakage limits
Megger DCM305E Earth Leakage Clamp Meter
Designed for checking earth leakage current, the Megger DCM305E Earth Leakage Clamp Meter helps investigate circuits where an RCD trips unexpectedly. Its six ranges extend from 6 mA to 100 A, with 0.001 mA resolution on the 6 mA range and TRMS measurement for leakage and load current. Automatic or manual ranging, a 6000-count display and an analogue bar graph support direct measurement and trend viewing.
Measurements on circuits affected by harmonics or electrical noise can use the 50/60 Hz low-pass filter to aid reading stability. Three preset compare limits, 0.25, 0.50 and 3.50 mA, provide visual and audible warnings when the chosen threshold is exceeded, while auto hold, data hold and peak hold provide three selectable hold options. A 40 mm jaw permits measurement on insulated and non-insulated conductors, with an automatic backlight, 20-minute auto power-off and tactile hand barrier included in the instrument design.
Key Benefits
- TRMS measurement supports sinusoidal and non-sinusoidal AC waveforms
- Low-pass filtering improves measurements on circuits affected by harmonics or electrical noise
- Compare mode provides visual and audible warnings when a selected leakage limit is exceeded
- Auto hold and data hold support measurements where access or display visibility is difficult
- Peak hold provides an additional selectable hold option
- Automatic backlighting aids viewing of the 6000-count display in poor light
- Analogue bar graph display supports measurement trending
- Automatic and manual ranging provide selectable range control
- Automatic power-off after 20 minutes of inactivity helps preserve battery life
- The 40 mm jaw accepts insulated and non-insulated conductors
Common Applications
The Megger DCM305E is suitable for a range of earth leakage investigations, including:
- Measuring earth leakage on circuits with unexpected RCD tripping
- Distinguishing excessive earth leakage from a sensitive or faulty RCD
- Investigating earth leakage caused by installation faults
- Investigating earth leakage caused by faulty appliances
- Checking leakage associated with cable insulation deterioration
- Checking leakage associated with cable damage
- Investigating moisture ingress around exposed terminals
General Specifications
| Specification | Details |
|---|---|
| Product type | Earth leakage clampmeter |
| Measuring function | TRMS leakage current and load current |
| Display | 6000-count LCD with analogue bar graph |
| Backlight | Automatic backlight for poor-light locations |
| Ranging | Automatic or manual |
| Hold functions | User-selectable auto hold, data hold and peak hold |
| Sampling rate | 5 times per second |
| Operating frequency range | 50 to 400 Hz |
| Low-pass filter | 50/60 Hz |
| Low-pass filter cut-off | Approximately 100 Hz, with an attenuation characteristic of approximately -24 dB per octave |
| Compare preset limits | 0.25, 0.50 and 3.50 mA, with visual indication and audible warning when the selected limit is exceeded |
| Overload indication | “OL” |
| Auto power-off | Approximately 20 minutes of inactivity |
| Power supply | 2 x 1.5 V alkaline AAA/LR03 batteries |
| Safety | EN61010-1 CAT III 300 V |
| EMC | EN61326-1 |
Measurement and Accuracy Specifications
| Measurement Function | Range and Resolution | Accuracy |
|---|---|---|
| TRMS AC current | 6 mA: 0.001 mA 60 mA: 0.01 mA 600 mA: 0.1 mA 6 A: 0.001 A 60 A: 0.01 A 100 A: 0.1 A |
0 ~ 10 A: ±(1% reading + 8 digits) 10 ~ 50 A: ±(2% reading + 10 digits) 50 ~ 100 A: ±(10% reading + 10 digits) |
| Frequency response | 61 ~ 400 Hz | 0 ~ 10 A: ±(2% reading + 11 digits) 10 ~ 50 A: ±(10% reading + 11 digits) 50 ~ 100 A: ±(35% reading + 11 digits) |
| Low-pass filter | 6 mA: 0.001 mA 60 mA: 0.01 mA 600 mA: 0.1 mA 6 A: 0.001 A 60 A: 0.01 A 100 A: 0.1 A |
0 ~ 10 A: ±(2% reading + 8 digits) 10 ~ 50 A: ±(3% reading + 10 digits) 50 ~ 100 A: ±(12% reading + 10 digits) |
Mechanical and General Information
| Specification | Details |
|---|---|
| Jaw size | 40 mm |
| Maximum jaw opening | 43 mm |
| Supported conductors | Insulated and non-insulated conductors |
| Hand protection | Tactile hand barrier and hand guard incorporated into the case design |
| Operating conditions | 0 to 30 °C at ≤80% RH 30 to 40 °C at ≤75% RH 40 to 50 °C at ≤45% RH |
| Storage conditions | -20 to +60 °C at 0 to 80% RH, with batteries not fitted |
| Operating altitude | ≤2000 m |
| Pollution degree | 2 |
| Temperature coefficient | 0.2 x specified accuracy per °C at <18 °C or >28 °C |
| Battery life | 60 hours with alkaline batteries |
| Dimensions | 78 mm (W) x 203 mm (H) x 42 mm (D) |
| Weight | 300 g |
Specification Notes
- Accuracy is specified at 23 °C ± 5 °C and <80% RH; position error is ±1% of reading
- Add 1.0% for crest factor 1.4 ~ 2.0, 2.5% for 2.0 ~ 2.5, and 4.0% for 2.5 ~ 3.0
- Maximum crest factor is 1.6 for 6000 ~ 5000 digits, 2.0 for 5000 ~ 3000 digits, and 3.0 for 3000 ~ 0 digits
Meta Description
Megger DCM305E Earth Leakage Clamp Meter measures TRMS leakage and load current up to 100 A, with a 50/60 Hz low-pass filter.
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