Understanding the difference between VDC (Volts Direct Current) and VAC (Volts Alternating Current) is fundamental for electrical contractors, maintenance teams, and commissioning engineers. In modern facilities, AC and DC systems operate side by side often within the same piece of equipment. Misidentifying voltage type, measuring it incorrectly, or overlooking quality issues can lead to nuisance trips, equipment damage, safety risks, and costly downtime. This guide breaks down VAC vs VDC from a practical testing and…
Fluke 87 vs 88 Comparison
Selecting between the Fluke 87V and 88V multimeters depends largely on specific measurement requirements and professional application. While sharing similar physical characteristics, these professional-grade instruments serve distinctly different purposes in electrical testing. Key Differences Between Models 87 and 88 The primary distinction between these digital multimeters lies in their specialized functions. The Fluke 87V delivers superior performance for electronics applications with “True RMS” capability, providing accurate measurements for non-linear loads. It provides exceptional…
Fluke 787 vs 789
For electrical and instrumentation, having and utilizing the right tools can make all the difference. Choosing between the Fluke 787 and 789 process meters isn’t easy when you need dependable equipment for electrical testing and calibration. Each one combines a 1000 volt CAT III/600 V CAT IV safety-rated digital multimeter with a full-featured mA loop calibrator in a…
Choosing the Right Ground Resistance Tester
At JM Test, we understand the importance of selecting the right tool for the job, and that includes your ground resistance tester. Just like electrical and instrumentation needs vary across projects, so too do the testers best suited to tackle them. Here at JM Test, we offer a wide range of ground resistance testers for purchase and rental – from compact, handheld models to feature-packed field instruments. Whether you need a simple and affordable solution for a…
Electrical Safety Supervisors, Do you know your workers?
Electrical Safety Supervisors, Do you know your workers? Years ago, during my time at a company, I had the opportunity to work closely with a highly experienced high-voltage electrician. While he taught me many valuable lessons, I often found myself questioning some of his methods, as they seemed unsafe. Being new to the trade, I had a deep respect for high-voltage work, but certain practices in the workplace raised concerns. The manager, who had limited…
Why Personal Protective Grounding/Bonding Is Important
After being in the electrical field for 25 years or more one thing continually comes up during discussions with others in the field and during training sessions and that is Personal Protective Grounding/Bonding (PPG/B). It’s remarkable at the electricians who don’t understand it’s purpose. So, let’s have a brief discussion on this matter. First things first! Definitions of PPG/B, Cable connected to de-energized lines and equipment by jumpering and bonding with appropriate clamps, to…
