The DET14C and DET24C represent a new generation of earth/ground clamp-on resistance testers. These instruments induce a test current into earth systems and measure ground
resistance in multi ground installations without needing to disconnect the ground. They offer market leading access, advanced features, simple operation and CAT IV 600 V
safety protection.
Designed with flat core ends they prevent dirt build up, ensuring measurement integrity and improved reliability over products with interlocking teeth. Other enhancements over
current generation products include improved accuracy and up to 300% increase in battery life. In electrically noisy environments the built-in filter function offers increased noise
immunity.
DET14C and DET24C also offer a true RMS AC current measurement facility up to 35 Amps. The instrument's ability to measure current flowing in an earth cable is a useful safety feature,
especially if the earth cable has to be disconnected. A high current flow to earth could draw an arc on dis-connection with potentially severe consequences.
The elliptical shaped head design offers improved access to cables and earth straps in space constrained locations. The clamp head accommodates up to 37 mm diameter cable and 50 mm
earth tapes making them suitable for use in power stations, substations, towers and many more facilities. Operation in dark and restricted areas is facilitated by a display with
backlight and an audible tone associated with the hold key. Optimised jaw opening mechanism ensures proper jaw closure without excessive use of force when opening the jaws.
The DET14C offers storage of results for later on-screen recall and the DET24C supports a download of results via IrDA-to-USB link into PowerDB and Power DB Lite, Megger's acceptance
and maintenance test data management software. Stored data is indexed using a sequential reference number together with a time and date stamp for each record.
Resistance Measurements
|
Ground Resistance Range
|
Resolution
|
Intrinsic Certainty
|
|
0.05Ω to 0.99Ω
|
0.01Ω
|
±1.5% ±0.05Ω
|
|
1.00Ω to 9.99Ω
|
0.01Ω
|
±1.5% ± 0.1Ω
|
|
10.0Ω to 99.9Ω
|
0.1Ω
|
±2% ± 0.5Ω
|
|
100.0Ω to 199.9Ω
|
0.1Ω
|
±5% ± 1Ω
|
|
200Ω to 400Ω
|
1Ω
|
±6% ± 5Ω
|
|
400Ω to 600Ω
|
1Ω
|
±10% ± 10Ω
|
|
600Ω to 1200Ω
|
10Ω
|
±20%
|
|
1200Ω to 1500Ω
|
10Ω
|
±35%
|
Alarm Settings
|
Alarm type
|
Range
|
Resolution
|
|
Threshold 1
|
1Ω to 1500Ω
|
1Ω
|
|
Threshold 2
|
1Ω to 1500Ω
|
1Ω
|
Current Measurements (RMS)
|
Current Range
|
Resolution
|
Intrinsic Certainty
|
|
0.5 mA to 0.99 mA
|
0.01 mA
|
±2% ±0.05 mA
|
|
1.00 mA to 9.99 mA
|
0.01 mA
|
±2% ±0.05 mA
|
|
10.0 mA to 99.9 mA
|
0.1 mA
|
±2% ±0.1 mA
|
|
100 mA to 999 mA
|
1 mA
|
±2% ±1 mA
|
|
1.00 A to 9.99 A
|
0.01 A
|
±2% ±0.01 A
|
|
10.0 A to 35.0 A
|
0.1 A
|
±2% ±0.1 A
|
True RMS readings up to a crest factor of 5.0 (peak current 40 A).
Accuracy guaranteed for 50 Hz and 60 Hz.
Measurement over the range 16 Hz to 400 Hz.
Maximum current is 100 A rms continuous and 200 A rms for 60 s max at 50 Hz and 60 Hz
Maximum jaw opening: 39 mm
Maximum jaw inner dimensions: 39 mm x 55 mm
Display type: 4 + 6 digit with backlight
Battery type: 4 x 1.5 V IEC LR6/AA alkaline
Battery life: 24 hours continuous testing – see Note 1
Auto power down: 300 s (reset by jaw action or button press)
Data logging: DET14C 256 records
DET24C 2 k records
Data download: Opto-coupled IrDA-USB interface (DET24C only)
Range selection: Automatic within each mode
Sample time: < 1 s
Hold function: Yes with visual indicator
Alarm function: Yes with visual indicator
Warning buzzer: Yes
Operating temperature and humidity: -20 °C to +50 °C, <85% RH
Storage temperature and humidity: -40 °C to +60 °C, <75% RH
Weight: 985 g
Instrument dimensions: 248 mm (l) x 114 mm (w) x 49 mm (h)
IP rating: IP30 with jaws closed
Note 1: Whilst measuring a 25Ω resistance without backlight
Performance:
IEC 61557-5
IEC 61557-13 Class 1
Safety:
EN 61010-2-032
CATIV 600 V
Pollution degree 2
EMC:
Class B Compliant, IEC 61326, BSEN 61326