![]() ![]() If you don't have a standard to go by the common rule of thumb is if the level is below 1M ohm that is a failure, the higher the reading above 1M ohm the better the integrity of the wire insulator. Ideally you would have guidelines from the motor manufacture or Electrical codes to determine good or bad. Example if the system is 480V you would set the Insulation tester to 1000V.Īnother common question is what ohm read is good or bad. The general rule of thumb is whatever the circuit or motor is rated for you double that voltage when using the Insulation tester. The idea behind using an insulation tool is to verify the coating on the outside of the wire has not lost integrity and shorted to ground or another wire.Ī common question when using an Insulation tester is what Voltage level to use. However, gold plated probes are what you do really want for optimum connectivity if you’re an electronics maker who is generally dealing with low voltage DC circuits and components.The purpose of this article is to show some general guidelines to perform an Insulation test with a Fluke instrument. ![]() For some reason it had never occured to me that Fluke don’t appear to do gold plated probes, as these are not the best to use for high voltage / AC. Secondly, you really should match your meter leads / probes, to what your actual usage is.Įg. The first obvious learning was that expensive does not mean they’re necessarily the best! This lead to a few other learnings, which I should have already known! But then, I’d always just taken Fluke meter leads for granted, as being all that you need as the assumed best quality! It seems that if you want really good quality leads for your favorite multimeter, you really can’t go past Probemaster. It didn’t take me long to find some great reviews and discussion about a USA company called Probemaster. You have a quality Fluke meter, which you “obviously” pair with quality Fluke leads & probes. So this got me doing some more research on what I’d always assumed was just a given… Reading the customer reviews was an eye opener! It seems that the break in my lead was a common failure point. So I was about to place my order when my curiosity noticed the low “star rating” for these leads on Fluke’s own website. These leads are not overly cheap, but you expect that with Fluke, as there is an assumed level of “good quality”. With these I’d just retain my existing probes, but have shiny new shrouded banana plug terminated silicone leads. Looking them up, the replacement leads are Fluke TL224. So my first thought was… Oh well, these leads have been well used, so it’s probably timely for a replacement set. This is unheard of on a trusty reliable “made in the USA” Fluke meter.Īfter some lead flexing I identified a break in the black lead in the stress relief where the silicone wire enters the straight shrouded banana plug which attaches to the probe. It was apparent that I had an issue with my Fluke multimeter leads as I was getting some vague readings. I thought I’d share my recent multimeter lead experience. ![]()
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