Objectives

• After studying this unit, you should be able to
• describe various test instruments used by technicians in the heating, air-conditioning, and refrigeration industry.
• test and calibrate a basic thermometer at the low- and high-temperature ranges.
• check an ohmmeter for accuracy.
• describe the comparison test for an ammeter and a voltmeter.
• describe procedures for checking pressure instruments above and below atmospheric pressure.
• check flue-gas analysis instruments.

Next: Advance to the Learning Center Dashboard and complete the lessons.