4-1CHAPTER 4COMMON TEST EQUIPMENTLEARNING OBJECTIVESUpon completing this chapter, you should be able to:1.Describe the proper operating procedures for using the multimeter.2.Describe the proper operating procedures for using the digital multimeter.3.Describe the proper operating procedures for using the differential voltmeter.4.Describe the proper operation of the transistor tester.5.Describe the proper procedure for using the RCL bridge to measure resistance, capacitance, andinductance.INTRODUCTIONIn the previous chapters, you have learned how to use some basic and miscellaneous measuringinstruments to perform required maintenance and upkeep of electronic systems and components. Youwere also introduced to the construction and operation of basic meter movements in test equipment. Thischapter will introduce you to some of the testing instruments commonly used in the Navy today.MULTIMETERSDuring troubleshooting, you will often be required to measure voltage, current, and resistance.Rather than using three or more separate meters for these measurements, you can use theMULTIMETER. The multimeter contains circuitry that allows it to be used as a voltmeter, an ammeter,or an ohmmeter. A multimeter is often called a VOLT-OHM-MILLIAMMETER (VOM).One of the greatest advantages of a VOM is that no external power source is required for itsoperation; therefore, no warm-up is necessary. Other advantages are its portability, versatility, andfreedom from calibration errors caused by aging tubes, line voltage variations, and so forth.Q-1.What is one of the greatest advantages of a VOM?Two disadvantages are that (1) the VOM tends to "load" the circuit under test, and (2) the metermovement is easily damaged as a result of improper testing procedures.CAUTIONNever press down on or place any object on the glass face of any multimeter.This can disable the meter movement from operating properly or cause damage.
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