4-1
CHAPTER 4
COMMON TEST EQUIPMENT
LEARNING OBJECTIVES
Upon 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, and
inductance.
INTRODUCTION
In the previous chapters, you have learned how to use some basic and miscellaneous measuring
instruments to perform required maintenance and upkeep of electronic systems and components. You
were also introduced to the construction and operation of basic meter movements in test equipment. This
chapter will introduce you to some of the testing instruments commonly used in the Navy today.
MULTIMETERS
During 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 the
MULTIMETER. 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 its
operation; therefore, no warm-up is necessary. Other advantages are its portability, versatility, and
freedom 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 meter
movement is easily damaged as a result of improper testing procedures.
CAUTION
Never 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.
