Electronic test Instrument CHAPTER 2 Electronic test Instrument

OBJECTIVES Identify the different types of electronic Test Instruments; Describe each type of electronic Test Instrument. Demonstrate on how to properly use each electronic instrument.

MULTI-TESTER The multi-tester or Multi-meter is a sometimes called VOM(Voltmeter, Ohmmeter, Milliammeter) is the best instrument that can measure voltage, resistance, and current.

TWO GENERAL TYPES OF MULTI-TESTER ANALOG MULTI-TESTER DIGITAL MULTI-TESTER

MULTI TESTER ANALOG MULTI-TESTER – Has a moving coil assembly which is characterized by a needle pointer.

ANALOG MULTI-TESTER POINTER SCALE ZERO POINTER OHM ADJUSTER ADJUSTER SELECTOR

ALTERNATING CURRENT DIRECT CURRENT DIRECT CURRENT AMPERE RESISTANCE

DIGITAL MULTI TESTER PIN/PROBE

GAME PLAY

MATERIALS ANALOG/DIGITAL Multi-Tester COMPUTER POWER SUPPLY BATTERY CHARGERS/BATTERY AUTOMATIC VOLTAGE REGULATOR RESISTORS

MECHANICS There are 4 game activities namely, Reading of Resistance, Alternating Current, Direct Current and Milliampere. Each game activity has a corresponding points. Each group should select 3 participants per game activity. The highest group who will earned the highest total points is free to leave the room after the class as a reward, While the group who earned the lowest will clean and arrange the room as a punishment.

GROUP TEAMS APL LEA SARAH BAMBOO

TEAM SCORES TEAMS RESITANCE DIRECT CURRENT TOTAL RANK APL LEA SARAH ALTERNATING CURRENT DIRECT CURRENT TOTAL RANK APL LEA SARAH BAMBOO 1

OTHER TYPES OF TESTER GALVANOMETER Are the basic components of many power and current meters.

WHEATSTONE BRIDGE Is a resistance measuring device. This particular instrument measures resistance values from 1Ohms to 11.01 Ohms

OSCILLOSCOPE A unique instrument designed to graphically time varying voltage and current values.

WATTMETER A meter that indicates real power.

THERMOCOUPLE AMMETER Consist of DC moving coil meter connected across the junction of a thermocouple.

ELECTROSTATIC VOLTMETER Constructed in the form a variable capacitor consisting of a pair of reading and stationary plate.

HOTWIRE AMMETER It consist of a spring connected to a resistance wire in which current passes through.