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Summary

This 61-minute DVD explains the purpose and operation of voltage testers, multimeters, clamp-on ammeters, and megohmmeters to measure current, voltage, and resistance. Safety precautions are emphasized throughout. Demonstrates how to perform voltage, current, and resistance measurements using the test equipment discussed.

• Using a Voltage Tester – 8 minutes
  States the main purpose of a voltage tester. Names the parts of a voltage tester and explains how a voltage tester works. Lists the steps required to check out a voltage tester and explains why it is necessary to check out a voltage tester before each use. Shows how to use a voltage tester.
  
• Meter Principles – 9 minutes
  Lists the two general ways in which meters are classified. Describes the functions of a multimeter, a clamp-on ammeter, and a megohmmeter. Explains how a permanent magnet moving coil (PMMC) meter movement works. Shows how a current measuring device can also be used to measure voltage and resistance.
  
• Using a Multimeter, Part 1 – 12 minutes
  Identifies the switches, jacks, and scales on a typical multimeter. Demonstrates how to measure resistance and DC voltage using a multimeter.
  
• Using a Multimeter, Part 2 – 12 minutes
  Demonstrates how a multimeter is used to measure DC current and AC voltage.
  
• Using a Clamp-On Ammeter – 8 minutes
  Identifies the parts and features of a clamp-on ammeter. Explains how the scales on a clamp-on ammeter are read. Demonstrates how to use a clamp-on ammeter to measure current.
  
• Using a Megohmmeter – 12 minutes
  Demonstrates how to operate a megohmmeter. Identifies some of the factors that affect how much resistance insulation has.

Support Materials Available

Student workbook, instructor guide.