The Ammeters, Meggers and Wheatstone Bridge course is designed for participants familiar with AC/DC theory, electrical safety, and electrical print reading. A basic understanding of electronic devices and circuits is recommended. The course describes megohmmeters, Wheatstone bridges, and clamp-on ammeters. It gives examples of the use of these instruments, identifies their components, and defines their functions. The lessons also describe safety and selection considerations for their use, how to set up the instruments, how to connect them to the systems under test, and how to take and read measurements.
Explain the formula and how a working knowledge of Ohm’s Law is helpful when analyzing test results.
Describe, and give an example of, the use of a megger; Define the function of a megger.
List the causes of damaged insulation; Describe the causes and effects of low resistance readings.
Identify the basic components of a typical megger; Identify the switches on a digital megger.
Describe safety considerations when using a megohmmeter.
List considerations and procedures when selecting, setting up, and reading a megger.
Define a bridge circuit.
Identify the components of a Wheatstone bridge.
Define the function of a Wheatstone bridge.
Describe how to balance a Wheatstone bridge.
Describe how to set mechanical and electrical zero on a Wheatstone bridge.
Describe how to take a reading with a Wheatstone bridge.
Describe how to interpret a Wheatstone bridge reading.
Interpret a Wheatstone bridge reading
Identify the components of a clamp-on ammeter.
Describe the range function of a clamp-on ammeter.
Define the function of a clamp-on ammeter.
Describe safety and selection considerations for using a clamp-on ammeter.
Define the “”record and lock”” features.
Describe the procedures for setting up a clamp-on ammeter.
Describe how to take a reading and modify the range of a clamp-on ammeter.