Mastering Your Meter Advanced Functionality with Louise Kellar (UEi Test Instruments)

Key takeaways

Advanced clamp meter features like low current accuracy, wattage, power factor, and microamp measurements greatly enhance diagnostic capabilities in HVAC work.
Familiarity with meter functions beyond the basics—such as diode testing, Low Z, and true RMS—is crucial for troubleshooting modern equipment effectively.
Proper clamp placement, understanding measurement settings, and regular tool maintenance ensure accurate readings and technician safety.
Safety features like the temperature lock toggle and adherence to CAT safety ratings help prevent accidents and equipment damage.
Continuous education and utilizing available industry resources are vital for staying proficient with evolving measurement tools and techniques.

Summary

Understanding Advanced Clamp Meter Functionality

The episode centers around maximizing the use of a digital clamp meter beyond basic voltage, current, and resistance measurements. Louise Kellar from UEi Test Instruments explains the capabilities of their High Accuracy Clamp Meter (HAC), emphasizing its precision at low currents vital for modern HVAC equipment like condenser fans and blowers. They highlight how these advanced functions enable more accurate wattage, capacitor-under-load testing, and diagnosing issues with minimal risk, especially with new features like power factor measurement, Bluetooth connectivity, and the ability to measure active and reactive power simultaneously.

Lesser-Known Features and Their Practical Uses

The discussion dives into features like microamp measurement for flame rectification testing, diode testing for board diagnosis, the Low Z setting for eliminating ghost voltages and safely bleeding capacitors, and the safety-lock temperature toggle that prevents accidental voltage and thermocouple cross-connection. Louise explains how these tools are often underutilized but crucial for accurate diagnostics and safety, emphasizing the importance of familiarity with meter functions to prevent errors and improve troubleshooting.

Common Mistakes and Best Practices in Meter Usage

The hosts cover frequent errors such as misusing auto-ranging settings, confusing continuity with resistance testing, and neglecting the importance of true RMS readings, especially with modern, non-sinusoidal power supplies. They stress the significance of understanding what measurements mean, knowing when to use each function, and the importance of verifying test leads and battery levels regularly to ensure safety and accuracy. The discussion also touches on the significance of proper clamp placement, especially on low-current or sensitive circuits, to avoid false readings.

Safety and Calibration Tips

Louise shares safety advice about using features like the temperature lock toggle to prevent dangerous mistakes, and discusses the meaning of CAT safety ratings, highlighting their importance for working safely across different voltage environments. Additionally, she mentions that some meters, such as UEi models, can be calibrated for temperature, and stresses the necessity of regular maintenance of test leads, batteries, and awareness of the meter's capabilities to maintain accuracy and safety.

Industry Resources and Education Opportunities

Listeners are encouraged to explore UEi’s website for manuals, videos, and additional product information. The hosts promote continued learning through industry events like the HVACR Training Symposium, NCI Summit, and AHR Expo, advocating for staying updated with new tools and techniques. They also remind technicians to read manuals thoroughly, utilize online resources, and stay engaged with industry safety standards and advanced measurement techniques.

Show notes

In this episode, Bryan welcomes back Louise Kellar of UEi Test Instruments for a deep dive into getting more out of a digital clamp meter than the basic volts, amps, and ohms most techs rely on every day. The tool in the spotlight is UEi's High Accuracy Clamp Meter (HAC), which is accurate when dealing with the low current draws common on modern condenser fan and blower motors and is critical for reliable wattage and capacitor-under-load testing.

The podcast also walks through a series of lesser-used but valuable meter functions, including microamp measurement for flame rectification testing, diode testing for diagnosing boards on mini-splits, the Low Z setting for eliminating ghost voltage readings and safely bleeding capacitors, and the safety-locking temperature toggle that prevents technicians from accidentally crossing voltage and thermocouple leads.

Bryan and Louise also cover common mistakes, such as not knowing when to use continuity or resistance and auto-ranging mistakes, as well as some crucial takeaways about true RMS measurements, temperature settings, and CAT safety ratings.

This episode contains embedded sponsor messages from Refrigeration Technologies, Carrier, NAVAC, and Filtrete.

Resources

Purchase your tickets or learn more about the 8th Annual HVACR Training Symposium at https://hvacrschool.com/symposium.