#electrical diagnosis

Tech Tips:

Understanding 240-Volt Circuits
By:Matthew BrunerIt can be useful to think of a multimeter as a “voltage drop” tool. Bryan covers the concept here in an excellent class that I highly recommend. This concept was a big help to me as I began to truly learn how to use a multimeter.  A meter reads the voltage differential between two […]
Read more
Beware of “Ghost” Voltage
By:Bryan Orr Disclaimer: “Ghost voltage” is a term used by techs to explain a phenomenon where they measure voltage they don't expect or when the voltage they see doesn't do the work they expect. More advanced techs know how to use the Lo-Z (low impedance) mode on their voltmeter if it has one to help […]
Read more
Isolation Diagnosis
There are many great diagnostic tools available to the service technician today, but I haven't found a tool as versatile as the simple isolation diagnosis. There are many ways this concept can be applied, but let's start with some examples so that you get what I mean. Low Voltage Short Circuit Isolation Diagnosis You arrive […]
Read more

Users with Tag #electrical diagnosis

loading

To continue you need to agree to our terms.

The HVAC School site, podcast and tech tips
made possible by generous support from