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Model DET20C Earth
Resistance Clamp Tester |
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Megger Clamp-on Earth/Ground Testers
The Megger models DET10C and DET20C measure earth/ground resistance and
current flow using clamp-on technology. The instruments induce a test
current into the system without the need to disturb existing
connections. Either unit is a useful addition to the more traditional
methods of earth/ground resistance testing that may require
disconnection and the use of stakes or ground rods. Simply clamp around
the conductor or stake/rod and measure the resistance to ground fast and
accurately.
The DET10C and DET20C can also be used to measure
earth/ground resistance in multiple loop installations without
disconnecting the earth ground. This allows the user to perform the test
quickly and easily in total safety, with the added convenience of having
a single point of measurement to read the earth/ground resistance.
Each instrument also provides a true RMS current
measurement reading to better indicate potential measurement problems
and provide a useful overview of the dynamics of the general
earth/ground system.
The Megger DET20C Earth Clamp meter is particularly suitable for
measuring earth resistance in various installations such as buildings,
pylons and RF transmitter sites. In addition the DET20C can be used for
inspection and verification of lighting protection systems. Also as the
DET20C has an USB download facility and is compatible with Megger
Download Manager software (supplied) allowing further analysis and
storage of data.
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Ground Resistance
Clamp Tester
Features
- Clear LCD display.
- Hold function for difficult to reach installations.
- Over current protected.
- Configurable high and low alarms with audible indication.
- Large jaw opening (35mm).
- Measures Ground Resistance from 25mΩ to
1550Ω.
- Measures Ground Leakage Current from
0.2mA to 35A.
- Automatic self calibration.
- Auto ranging.
- High and low alarms.
- USB output of data via isolated
pluggable interface.
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Electrical Specifications |
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Ground Resistance Range2 |
Resolution |
Accuracy1 |
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0.025Ω to 0.25Ω |
0.002Ω |
±1.5% ±0.05Ω |
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0.25Ω to 9.999Ω |
0.02Ω |
±1.5% ±0.01Ω |
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10Ω to 99.99Ω |
0.04Ω |
±2.0% ±0.3Ω |
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100Ω to 199.9Ω |
0.4Ω |
±3.0% ±1.0Ω |
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200Ω to 400Ω |
2Ω |
±5.0% ±5Ω |
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400Ω to 600Ω |
5Ω |
±10% ±10Ω |
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600Ω to 1500Ω |
20Ω |
±20% |
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Note1:
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Loop resistance non-inductive, external field <50A/m,
external.
Electrical field <1V/m, conductor centered in jaws. |
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| Note2: |
Resistance measurement frequency 3.333kHz |
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Range |
Resolution |
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0Ω to 1550Ω (High
alarm) |
1Ω |
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0Ω to 1550Ω (Low
alarm) |
1Ω |
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Leakage Current Range3 |
Resolution |
Accuracy1 |
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0.200mA to 1.000mA |
0.001mA |
±2.0% ±0.05mA |
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1.00mA to 10.00mA |
0.01mA |
±2.0% ±0.03mA |
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10.00mA to 100.0mA |
0.1mA |
±2.0% ±0.3mA |
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100mA to 1000mA |
1mA |
±2.0% ±3mA |
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0.20A to 35A |
0.01A |
±2.0% ±0.03A |
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| Note3: |
Auto range, 50/60Hz, true RMS to crest factor <3.5 |
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Specifications |
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Conductor Size |
35mm diameter approx. |
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Display Type |
4 digits 9999 counts LCD |
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Range Selection |
Automatic within function |
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Overload Indication |
'OL' |
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Auto Power Down |
5 minutes approx. |
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Sampling Time |
0.5 seconds |
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Data Logging Capacity |
8180 records |
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Environmental Specifications |
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Operating Temperature |
0°C to 50°C |
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Storage Temperature |
-20°C to 60°C |
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Storage Humidity |
Less than 75% R.H. |
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Safety |
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Complies with the requirements |
of
EN 61010-2-032 CAT III 300V, CAT II 600V, Pollution degree 2. |
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General Specifications |
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Power Supply (battery) |
9 volt IEC 6LR1 Alkaline battery |
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Power Consumption |
40mA |
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Battery Life |
3000 measurements approx. |
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Dimensions |
276mm (L) x 100mm (W) x 47mm (D) |
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Weight |
750g |
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Ordering Information |
Model DET20C
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Digital Earth Test Clamp Meter, complete with Carry case,
Calibration loop and battery (fitted), USB interface unit and
Download Manager Software. |
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