Micro Ohm meter
What is Micro Ohm meter?
A micro ohm meter, also known as a microohmmeter or a low-resistance ohmmeter, is an electronic test instrument used to measure very low resistance values with high accuracy. The measurement range of a micro ohm meter typically starts from 1 micro ohm (μΩ) and can go up to a few hundred ohms.
Micro ohm meters use a low-voltage, high-current DC source to pass a known amount of current through the test circuit, and then measure the voltage drop across the circuit to calculate the resistance value. The instrument is designed to eliminate any potential sources of error, such as contact resistance or thermal effects, that could affect the accuracy of the measurement.
Micro ohm meters are commonly used in the electrical and electronics industry to measure the resistance of conductive materials such as wires, cables, bus bars, and connectors. They are also used in the aerospace, automotive, and military industries to measure the resistance of materials used in electronic and mechanical systems. Micro ohm meters are particularly useful in applications where low resistance values are critical, such as in grounding systems or in welding applications.
Some features to consider when selecting a micro ohm meter include the measurement range, accuracy, resolution, test current, and test duration. Some popular micro ohm meter models include the Megger DLRO100 series, the AEMC 6255 Micro-Ohmmeter, and the Extech 380560 High Resolution Precision Micro-Ohm Meter.
Where Micro Ohm meter is used?
Micro ohm meters are used in a wide range of industries and applications where precise measurement of low resistance values is required. Here are some examples of where micro ohm meters are commonly used:
- Electrical industry: Micro ohm meters are used to measure the resistance of electrical connections, grounding systems, and bus bars in power generation, transmission, and distribution systems. They are also used to measure the resistance of electrical cables and wires to ensure they meet safety and performance standards.
- Aerospace industry: Micro ohm meters are used to measure the resistance of electrical contacts and wiring in aerospace and aviation systems. These systems require high reliability and low resistance to ensure safe operation.
- Automotive industry: Micro ohm meters are used to measure the resistance of electrical connections in automotive systems, including battery cables, engine grounding straps, and starter and alternator circuits. They are also used to test the resistance of spark plug wires and ignition coils.
- Welding industry: Micro ohm meters are used to measure the resistance of welding connections, such as those used in spot welding and resistance welding. These connections need to be accurately measured to ensure consistent and reliable weld quality.
- Quality control and testing laboratories: Micro ohm meters are used in quality control and testing laboratories to verify the resistance values of components and materials, such as resistors, fuses, and conductive coatings.
Overall, micro ohm meters are used in any industry where precise measurement of low resistance values is critical for safety, performance, or quality control purposes.
Why Micro-ohm meter needs Calibration?
Micro-ohm meters are precision instruments that measure very low resistance values, typically in the range of milliohms to microohms. Calibration is necessary to ensure that the micro-ohm meter is measuring resistance accurately and reliably.
Here are a few reasons why micro-ohm meters need calibration:
- To maintain accuracy: Over time, the components in a micro-ohm meter can drift or wear, which can cause the measurements to become inaccurate. Calibration can help correct any deviations and ensure that the readings are accurate.
- To meet industry standards: Many industries have specific requirements for the accuracy and calibration of micro-ohm meters. Calibration ensures that the meter meets industry standards and specifications.
- To ensure safety: Accurate measurements of low resistance values are crucial for safety in many applications, such as in grounding systems or welding connections. Calibration can help to ensure that the measurements are reliable and that safety standards are being met.
- To comply with regulations: Some industries, such as medical device manufacturing, may require that all test equipment be calibrated and certified to meet regulatory requirements.
Calibration intervals may vary depending on the frequency of use, environmental conditions, and specific industry standards and regulations. It's important to follow the manufacturer's recommendations for calibration and to have the calibration performed by qualified technicians or accredited calibration laboratories. Calibration certificates should be kept on record as evidence of compliance with industry standards and regulations.
List of Micro-ohm meter Manufacturers:
Here is a list of some manufacturers of micro-ohm meters:
- AEMC Instruments
- Chroma ATE Inc.
- DV Power
- Extech Instruments
- Meco Instruments
- OMICRON electronics
- Tinsley Precision Instruments
This is not an exhaustive list and there may be other manufacturers of micro-ohm meters as well. It's important to do research and choose a reputable manufacturer with a track record of producing reliable and accurate instruments.
Most popular Micro ohm meter Model:
There are several popular models of micro-ohm meters available in the market, each with its own set of features and capabilities. Here are a few examples:
- DV Power RMO-T Series: This micro-ohm meter series is designed for testing circuit breaker contacts, switchgear main contacts, and busbar joints. It offers a test current range from 10 A to 600 A, and a resistance measurement range from 0.1 µΩ to 2 Ω.
- Megger DLRO600: This rugged, portable micro-ohm meter is designed for use in the field or in the laboratory. It offers a test current range up to 600 A, and a resistance measurement range from 0.1 µΩ to 999.9 mΩ.
- Extech 380560: This handheld micro-ohm meter is designed for quick and easy resistance measurements of circuits, fuses, switches, and other electrical devices. It offers a resistance measurement range from 0.1 mΩ to 199.9 Ω.
- Hioki RM3545: This micro-ohm meter is designed for testing electrical resistance in a wide range of applications, from power transformers to motors and electrical wiring. It offers a test current range up to 50 A, and a resistance measurement range from 0.1 µΩ to 3.5 kΩ.
It's important to choose a micro-ohm meter that meets your specific needs and requirements. The most popular model may vary depending on the industry, application, and budget.
Who can Calibrate Micro-ohm meter?
Zenith Sales and Calibrations Pty Ltd has state of the art NATA (ISO17025) certified calibration standards and offers smart close loop computerised calibration service in our Sydney and Melbourne Laboratory.
Our Calibration Certificate will satisfy requirements of ISO 9001, ISO 14001, ISO 27001 ISO 45001, ISO 55001 etc.
We also provide on-site Calibration service, where we come to your site or facility.
Contact us for Micro-ohm meter Calibration.
Sydney: 02 9680 8765
Melbourne: 03 9562 0373
24 x 7: 0481 516 098