Metrel MI 3252 MicroOhm 100A Digital Low Resistance Ohmmeter User Manual

1. Bubuka

This manual provides essential instructions for the safe and effective operation of the Metrel MI 3252 MicroOhm 100A Digital Low Resistance Ohmmeter. The MI 3252 is a portable instrument designed for accurate measurement of low resistance values in various electrical components, including circuit breakers, busbars, cable joints, and welding points. Please read this manual thoroughly before using the device.

Figure 1.1: The Metrel MI 3252 MicroOhm 100A instrument shown within its rugged carrying case, ready for transport or operation.

2. Émbaran Kasalametan

WARNING: Always observe safety precautions when working with electrical equipment. Failure to do so may result in injury or damage to the instrument.

• Ensure the instrument is in good working condition before use.
• Do not use the instrument in wet conditions or in explosive atmospheres.
• Always connect and disconnect test leads with the power off to the circuit under test.
• Verify the continuity of test leads before each measurement.
• Refer to local safety regulations and standards for electrical testing.
• The instrument is designed for CAT IV, 50 V environments.

3. Eusi Paket

Pastikeun yén sadaya item anu didaptarkeun di handap aya dina pakét anjeun:

• Metrel MI 3252 MicroOhm 100A Instrument
• kabel kakuatan utama
• Test leads (e.g., 2 x 5m, 2 x 10m, with crocodile clips)
• Uji usik
• Kabel RS232
• kabel USB
• Kantong pikeun asesoris
• PC SW HVLink PRO software
• Manual instruksi (dokumen ieu)
• Sertipikat kalibrasi

Figure 3.1: The Metrel MI 3252 MicroOhm 100A instrument shown with its standard accessories, including test leads, cables, and a carrying bag.

4. Alat Leuwihview

The MI 3252 is housed in a rugged carrying case. The front panel features the display, control buttons, and connection terminals.

angka 4.1: Tutup-up view of the Metrel MI 3252 front panel, showing the LCD screen, navigation buttons, power input, and test lead terminals (C1, C2, P1, P2).

4.1. Komponén Panel hareup

• Layar LCD: Shows measurement results, settings, and menu navigation.
• Tombol kontrol: For menu navigation, function selection, and starting/stopping measurements.
• Power Input (110/230V~): For connecting the main power supply.
• Test Terminals (C1, C2, P1, P2): For connecting current and potential leads.
• RS232 / USB Ports: For data communication with a PC.

5. Setélan

5.1. Ngahurungkeun Alat

1. Ensure the instrument is placed on a stable, flat surface.
2. Connect the main power cable to the instrument's power input and a suitable AC outlet. The instrument can also operate on its internal battery.
3. Pencét tombol daya pikeun ngaktipkeun alat.

5.2. Nyambungkeun Test Leads

The MI 3252 uses a 4-wire (Kelvin) measurement method for high accuracy. This requires separate current and potential leads.

1. Connect the current leads (C1, C2) to the outer terminals of the test object.
2. Connect the potential leads (P1, P2) to the inner terminals of the test object.
3. Ensure all connections are secure and make good electrical contact.

6. Parentah Operasi

6.1. Basic Resistance Measurement

1. Turn on the MI 3252.
2. Navigate to the "Resistance Measurement" function using the control buttons.
3. Select the desired test current (e.g., 10A, 100A) if applicable. The instrument supports adjustable test currents from 100 mA to 100 A.
4. Connect the test leads to the object under test as described in Section 5.2.
5. Press the "START" button to initiate the measurement.
6. The resistance value will be displayed on the LCD screen.
7. To stop the measurement, press the "STOP" button.

6.2. Jilidtage Drop Measurement

The MI 3252 can also perform voltage drop measurements.

1. Select the "Voltage Drop" function from the menu.
2. Sambungkeun kabel uji.
3. Initiate the measurement. The voltage serelek bakal dipintonkeun.

6.3. PASS/FAIL Criteria

The instrument allows setting custom limits for PASS/FAIL evaluation of test results. Refer to the on-screen menu for configuring these limits.

7. Measurement Functions and Key Features

7.1. Fungsi Pangukuran

• Ukur résistansi: Wide measuring range (10 µΩ to 20 Ω) with high accuracy (0.25 % of reading) and resolution down to 1 nΩ.
• Adjustable Test Current: From 100 mA to 100 A.
• Voltage Drop Measurement: For assessing contact quality.
• Grafik batang: On-screen resistance bar graph for visual indication.

7.2. Fitur konci

• Kasalametan: Safe sustain external voltages in case of wrong connection, protection level (CAT IV, 50 V); automatically detects continuity in current circuit.
• Measuring Modes: Single and continuous measuring modes.
• Portability: Rugged carrying case with a handle and lightweight design enables easy movement between sites.
• High Protection Degree: IP 64.
• Custom Limits: The limits can be set for PASS or FAIL evaluation of test results.
• Batré Powered: The instrument enables measurements with 100 A for up to 10 minutes when powered from internal battery only.
• Mémori: Built-in memory enables storage of up to 1000 test results.
• Downloadable: Downloads test results via RS232 or USB cable directly to the PC with the help of the software.

Gambar 7.1: Hiji leuwihview of the Metrel MI 3252 MicroOhm 100A, highlighting its accurate low resistance measurement capabilities, key features, and typical applications such as testing circuit breakers and busbars.

8. Manajemén Data

8.1. Saving Results

After a measurement, you can save the results to the internal memory. Follow the on-screen prompts to store the data, often involving selecting a memory location or project.

8.2. Mindahkeun Data ka PC

The MI 3252 can transfer stored test results to a personal computer using the provided RS232 or USB cable and the HVLink PRO software.

1. Install the HVLink PRO software on your PC.
2. Connect the MI 3252 to your PC using either the RS232 or USB cable.
3. Launch the HVLink PRO software.
4. Follow the software instructions to establish communication and download the stored test results.

9. Pangropéa

9.1. beberesih

Bersihkeun alatnaasing kalawan lemes, damp lawon. Ulah nganggo pembersih atanapi pangleyur anu abrasif. Pastikeun teu aya Uap anu asup kana alat.

9.2. Kaperawatan batré

To prolong battery life, charge the instrument regularly. If storing for extended periods, ensure the battery is partially charged (around 50%) and recharge every few months.

9.3. Kalibrasi

Regular calibration by authorized service centers is recommended to maintain the accuracy of the MI 3252. Refer to the calibration certificate for recommended intervals.

10. Cara ngungkulan

• Alatna teu hurung:
  • Pariksa lamun kabel kakuatan disambungkeun aman.
  • Ensure the AC outlet is functional.
  • Verify the internal battery has sufficient charge.
• Bacaan teu akurat:
  • Check test lead connections for proper contact.
  • Ensure test leads are not damaged.
  • Verify the correct measurement function and test current are selected.
  • Consider if calibration is due.
• Masalah transfer data:
  • Ensure the correct cable (RS232 or USB) is used and securely connected.
  • Verify the HVLink PRO software is installed and running correctly.
  • Check PC port settings if using RS232.

If problems persist, contact Metrel technical support.

11. Spésifikasi

The following table outlines the technical specifications for the Metrel MI 3252 MicroOhm 100A.

Figure 11.1: Detailed technical specifications, including measurement ranges, resolution, accuracy, power supply, and dimensions for the Metrel MI 3252.

12. Rojongan sarta Kontak Émbaran

For technical assistance, service, or inquiries regarding your Metrel MI 3252 MicroOhm 100A, please contact Metrel customer support or your authorized distributor.

Métrel dd
Ljubljanska 77
SI-1354 Horjul
Slovénia
Telepon: +386 (0)1 7558 200
Fax: +386 (0)1 7549 226
Surélék: metrel@metrel.si
Websitus: www.metrel.si