CHAPTER 2

Electronic test Instrument

OBJECTIVES

1. Identify the different types of electronic Test Instruments;

2. Describe each type of electronic Test Instrument.

3. Demonstrate on how to properly use each electronic instrument.

MULTI-TESTER

The multi-tester or Multi-meter is asometimes called VOM(Voltmeter,Ohmmeter, Milliammeter) is the bestinstrument that can measure voltage,resistance, and current.

TWO GENERAL TYPES OF MULTI-TESTER

1. ANALOG MULTI-TESTER

2. DIGITAL MULTI-TESTER

MULTI TESTER

ANALOG MULTI-TESTER –Has a moving coil assemblywhich is characterized by aneedle pointer.

ANALOG MULTI-TESTER

POINTER SCALE

ZERO POINTER OHM ADJUSTERADJUSTER

SELECTOR

ALTERNATING CURRENT

RESISTANCE

DIRECT CURRENT

DIRECT CURRENTAMPERE

DIGITAL MULTI TESTER

PIN/PROBE

GAME PLAY

MATERIALS

1. ANALOG/DIGITAL Multi-Tester

2. COMPUTER POWER SUPPLY

3. BATTERY CHARGERS/BATTERY

4. AUTOMATIC VOLTAGE REGULATOR

5. RESISTORS

MECHANICS

There are 4 game activities namely, Reading ofResistance, Alternating Current, Direct Current andMilliampere.

Each game activity has a corresponding points.

Each group should select 3 participants per gameactivity.

The highest group who will earned the highest totalpoints is free to leave the room after the class as areward, While the group who earned the lowest willclean and arrange the room as a punishment.

GROUP TEAMS

APL

LEA

SARAH

BAMBOO

TEAM SCORES

TEAMS RESITANCE ALTERNATING CURRENT

DIRECT CURRENT

TOTAL RANK

APL 0

LEA 0

SARAH 0

BAMBOO 1

OTHER TYPES OF TESTER

GALVANOMETER

Are the basic components of manypower and current meters.

WHEATSTONE BRIDGE

Is a resistancemeasuring device.This particularinstrumentmeasures resistancevalues from 1Ohmsto 11.01 Ohms

OSCILLOSCOPE

A unique instrument designed tographically time varying voltage andcurrent values.

WATTMETER

A meter thatindicates realpower.

THERMOCOUPLE AMMETER

Consist of DC moving coil meterconnected across the junction of athermocouple.

ELECTROSTATIC VOLTMETER

Constructedin the forma variablecapacitorconsistingof a pair ofreading andstationaryplate.

HOTWIRE AMMETER

It consist of aspringconnected to aresistance wirein which currentpasses through.