What's In A Spec?

(and how it can help your Ground Testing)

Unlike many less established product lines, AVO International fully specs out all of our models in readily available literature. Those details in "fine print" at the end of a product bulletin can be useful, even critical, to particular applications. Let's take a look at our Ground Testers, Models DET5/4R, DET5/4D and the economical DET62D...

 Current Spike

 Potential Spike
 20 W range 4 k_ ± 0.5 k W   all ranges 75 k W
 200 W range 40 k W ± 5 k W  
 2 k W /20 k W 400 k W ± 50 k W  

So what? Though these specs aren't as readily sought as those of the more prominent features, they, too, reflect the steady improvement of performance, while adhering to the accepted IEEE method known as "Fall of Potential." Ground testing frequently appears a daunting task, especially to the uninitiated. Because of its critical reliance on procedure, Fall of Potential testing can seem prohibitively difficult to those who have never had the opportunity to do more than hook up two leads and take a reading. Here's how the new Megger® Ground Testers can lessen this concern and reduce time and work...

Higher probe resistances increase the range of conditions under which an optimal test can be made. In fact, the latest specifications are such that the "probes" frequently don’t have to be driven at all! Just pour water on a flat surface, lay the probes on that surface in the pools of water, check that the spike resistance indicators are not lit, and take a measurement! It's that simple. The tester tells the operator whether or not an adequate test setup has been achieved, and if so, press the button and it's done! No hammering of spikes, or struggling to pull them up at the conclusion. No time consuming relocation to achieve adequate contact. And most important, for those commonly testing in congested areas, the freedom of simply placing probes on a concrete surface in convenient locations, instead of searching for precious patches of open ground.

Please remember that, for this technique to be successful, good probe contact must be made with a conducting surface. The Megger Ground Testers' indicators will verify proper conditions. As in all ground testing situations, soil conditions still dictate terms, and driving the probes will still be necessary in the more difficult environments. But the exceptional resistance tolerance of Megger Ground Testers significantly reduces the necessity, and makes our already simplified operation that much easier.