Metrel MI 3123 SMARTEC Earth Clamp, Earth Resistance Tester

1. Introduktion

The Metrel MI 3123 SMARTEC Earth / Clamp is a sophisticated earth resistance tester designed for precise measurement of earth resistance and specific earth resistance. This instrument supports various measurement methods, including 4-wire earth resistance, 4-wire earth resistance with one current clamp (optional), contactless earth resistance with two clamps (optional), and TRMS current measurement up to 20 A. Its robust design, user-friendly interface with a large bright LCD screen, and built-in help screens make it an essential tool for electrical testing professionals. The MI 3123 allows for configurable limits for PASS/FAIL evaluation and enables data storage and download via RS232 or USB for comprehensive reporting.

2. Sikkerhedsoplysninger

Always adhere to local and national safety regulations when operating the MI 3123. This instrument is designed for use in environments up to overvoltage category CAT IV, ensuring high safety standards. Before each use, inspect the instrument, test leads, and accessories for any damage. Do not use the device if it appears damaged. Ensure proper grounding procedures are followed during all measurements. Refer to the full instruction manual on the included CD for detailed safety guidelines and operational procedures.

• Ensure all connections are secure before applying power or initiating measurements.
• Brug ikke instrumentet i våde forhold eller eksplosive atmosfærer.
• Always use the correct test leads and accessories supplied or approved by Metrel.
• Disconnect the instrument from the circuit before changing measurement functions or connecting/disconnecting leads.

3. Pakkens indhold

Upon unpacking your MI 3123 SMARTEC Earth / Clamp, please verify that all items listed below are present and in good condition:

Figur 3.1: Contents of the MI 3123 SMARTEC Earth / Clamp package, showing the main unit, test leads, earth rods, batteries, and power adapter.

• Instrument Smartec Earth / Clamp
• Soft hand strap
• Test lead, 4.5 m (blue)
• Test lead, 4.5 m (red)
• Test lead, 20 m (green)
• Test lead, 20 m (black)
• Earth test rod, 4 pcs
• Power supply adapter + 6 NiMH rechargeable batteries, type AA
• Brugsanvisning på CD
• Kort brugsanvisning
• Håndbog på CD
• Kalibreringscertifikat

4. Produktet er slutview

The MI 3123 is a compact and robust device designed for accurate earth resistance measurements. Its intuitive interface and comprehensive features ensure reliable performance in various testing scenarios.

4.1 Nøglefunktioner

• Målefunktioner: Earth resistance (4-wire method), Earth resistance (4-wire method with one current clamp - option), Earth resistance (two clamps method - option), Specific earth resistance, TRMS current (option).
• Earth resistance measurement: Performs standard 4-wire earth resistance tests with two earthing rods and specific earth resistance measurement.
• Contactless earth resistance test: Earth resistance measurement with 2 current clamps without breaking the loop, ideal for measuring resistance of individual earthing rods.
• Datadownload: Results can be downloaded via RS232 or USB cable directly to a PC with optional software for analysis and report generation.
• PASS/FAIL Evaluation: Configurable limits enable quick assessment of test results.
• Large Bright LCD Screen: Ensures clear visibility of measurements and settings.
• Built-in Help Screens: Provides on-device guidance for various functions.
• Overvoltage Category CAT IV: Ensures high safety for industrial applications.
• Robust and Ergonomic Design: Lightweight and durable for field use.

4.2 Instrument Layout

Figur 4.1: Front view of the MI 3123 SMARTEC Earth / Clamp, showing the LCD display, navigation buttons, function selector, and input terminals.

Figur 4.2: Vinklet view of the MI 3123 SMARTEC Earth / Clamp, highlighting its ergonomic design and side connections.

The instrument features a central LCD display for clear readings, surrounded by intuitive navigation buttons for menu access and setting adjustments. A rotary switch allows selection of various measurement functions. Input terminals for test leads are located at the bottom of the device.

Figur 4.3: An informational graphic summarizing the main features and suitable applications of the MI 3123, including various earth resistance measurement types, data logging, and compliance with IEC/EN standards. It also shows examples of the device in use and its display with PASS/FAIL indicators.

5. Opsætning

5.1 Batteriinstallation og opladning

The MI 3123 is powered by 6 NiMH rechargeable AA batteries. Before first use, or if the battery indicator shows low charge, fully charge the batteries using the supplied power supply adapter. Connect the adapter to the instrument's charging port and plug it into a suitable power outlet. The charging indicator on the device will confirm charging status.

5.2 Connecting Test Leads and Earth Rods

For 4-wire earth resistance measurements, connect the provided test leads to the instrument's terminals as indicated in the short instruction manual. Insert the four earth test rods into the ground at appropriate distances and configurations according to the specific measurement method being performed. Ensure good contact between the test leads and the earth rods.

6. Betjeningsvejledning

The MI 3123 offers several measurement functions. Always refer to the detailed instruction manual on the CD for comprehensive guidance on each measurement type, including connection diagrams and specific procedures.

6.1 Standard 4-Wire Earth Resistance Measurement

1. Connect the four test leads to the instrument and to the earth rods as per the standard 4-wire configuration.
2. Select the 4-wire earth resistance function using the rotary switch.
3. Press the TEST button to initiate the measurement.
4. Read the resistance value displayed on the LCD. The instrument will indicate PASS/FAIL based on configured limits.

6.2 Specific Earth Resistance Measurement

This function measures the resistivity of the soil. Follow the connection diagrams for specific earth resistance measurement, typically involving a linear arrangement of four earth rods. The instrument calculates and displays the specific earth resistance based on the measured resistance and the spacing of the rods.

6.3 Contactless Earth Resistance (Two Clamps Method - Optional)

For this method, two optional current clamps (A 1018 and A 1019) are required. This allows for earth resistance measurement without disconnecting the earthing system. Connect the clamps to the instrument and place them around the earthing conductor as instructed. The instrument will measure the resistance of individual earthing rods within a loop.

6.4 Data Storage and Download

The MI 3123 can store test results internally. Use the MEM button to save measurements. To download data, connect the instrument to a PC via RS232 or USB cable. Utilize the optional Metrel software (e.g., EuroLink PRO PC SW package) for data retrieval, analysis, and professional report generation.

7. Vedligeholdelse

7.1 Rengøring

Clean the instrument's casing med en blød, damp cloth. Do not use abrasive cleaners or solvents. Ensure no moisture enters the device. Keep the display clean for optimal visibility.

7.2 Pleje af batterier

To prolong battery life, fully charge the NiMH batteries before storage if the instrument will not be used for an extended period. If the instrument is stored for a long time, it is recommended to periodically recharge the batteries. Replace batteries only with the specified type (NiMH AA rechargeable batteries).

7.3 Kalibrering

Regular calibration is essential to maintain the accuracy of the MI 3123. Refer to the calibration certificate for recommended intervals. Calibration should only be performed by authorized service centers.

8. Fejlfinding

This section provides basic troubleshooting steps for common issues. For more complex problems, consult the full instruction manual or contact Metrel customer support.

• Instrumentet tændes ikke: Check battery charge. Ensure batteries are correctly inserted.
• Unøjagtige aflæsninger: Verify all test lead connections are secure and clean. Ensure earth rods have good contact with the ground. Check for external electrical interference.
• Problemer med dataoverførsel: Ensure the correct USB/RS232 cable is used and properly connected. Verify that the Metrel software is installed correctly and drivers are up to date.
• Problemer med skærm: If the display is dim or unreadable, check battery charge.

9. Specifikationer

Key technical specifications for the Metrel MI 3123 SMARTEC Earth / Clamp:

10. Garanti og support

The Metrel MI 3123 SMARTEC Earth / Clamp kommer med en two-year (24-month) warranty from the manufacturer, covering defects in materials and workmanship under normal use. For warranty claims or technical support, please contact Metrel customer service or your authorized distributor.

Additional resources, including the full instruction manual and handbook, are provided on the included CD. Software for data download and report generation can be obtained from Metrel or your distributor.