CIRCUIT-TESTER-and-DIGITAL-METER-Copy-2.pdf

LiTE 605 Small Engine Automotive Technology and Services Professor: Prof. RANDY T. BERINA PRESENTER: SARIFA P. SALMO  CIRCUIT TESTER AND DIGITAL METER OBJECTIVES  Understand the function of circuit tester and digital meter  Identify their parts and functions ...

LiTE 605 Small Engine Automotive Technology and Services Professor: Prof. RANDY T. BERINA PRESENTER: SARIFA P. SALMO  CIRCUIT TESTER AND DIGITAL METER OBJECTIVES  Understand the function of circuit tester and digital meter  Identify their parts and functions  Learn safety operation procedures  Develop the ability to use a digital meter to test continuity, AC voltage and DC voltage.  Circuit Tester Automotive electrical circuit tester are commonly used by mechanics and technicians to detect and diagnose electrical malfunctions in vehicles. A circuit tester is an essential diagnostic tool used to assess and troubleshoot any electrical circuitry, ensuring that the systems are functioning correctly and efficiently. Circuit Tester A circuit tester, also known as a voltage tester or a test light, is a simple electrical tool used to determine the presence of an electric current in a circuit or device.  This auto circuit tester ideal for checking various vehicles' electrical circuits, such as car headlights, Taillights, fuses, car batteries, etc. Circuit Tester  Parts of Circuit Tester Connection Port Spring Wire Spring and Light Bulb Alligator Clip Test Probe PARTS OF CIRCUIT TESTER 1.Probe: This is the part you use to make contact with the electrical circuit. It usually has a pointed end for piercing insulation or a clip for attaching to a terminal. 2.Indicator Light: This is the light (usually LED or bulb) that illuminates to show whether the circuit is live. 3.Spring: This applies consistent pressure to the probe for reliable contact. 4. Alligator Clip: to establish temporary electrical connections when clipped onto terminals and components. 5. Spring Wire: used for establishing electrical conductivity between two devices of an electrical circuits. 6. Connection port: designed to ensure a stable and secure connection between the tester and the circuit.  OPERATION 1. Preparation: Ensure the circuit tester is in good working condition. Check the indicator light to confirm it's functional before use. 2. Connecting to Ground: Attach the ground lead of the tester to a known ground point. This could be the negative terminal of the battery or a metal part of the vehicle chassis. A good ground connection is essential for accurate testing. 3.Testing the Circuit: Touch the probe end of the tester to the point in the circuit you want to test. This could be a terminal, wire, or connector. If the circuit is live (there is voltage present), the indicator light will illuminate. The light’s illumination confirms that the circuit is carrying electrical current. 4. Interpreting Results: Light On: Indicates that there is voltage present at the test point. This means the circuit is live and has power. Light Off: Indicates that there is no voltage present at the test point. This could mean the circuit is not powered, or there is a break or fault somewhere in the circuit. DIGITAL METER  What is Digital meter?  Digital meter can be used on car electrical systems to help identify issues with wiring, components, and connections.  A digital/multimeter is a devise used to measure voltage, resistance and current in electronics & electrical equipment  Parts and Function of Digital Meter 1. Red meter lead Is connected to Voltage/Resistance or amperage port Is considered the positive connection 2. Probes Are the handles used to hold tip on the tested connection 3. Tips Are at the end of the probe and provides a connection point 4. Black meter lead Is always connected to the common port Is considered the negative connection  Display & Dial Settings 5. Digital Display Shows measured value. 6. Meter Dial Turn dial to change functions. Turn dial to OFF position after use. 7. Panel Indicator Shows each function and setting range to turn dial to. 8. Probe Connections Specific for each function. Measuring OPERATIONVoltage Plug the test leads into the COM and V terminals. Both AC and DC voltage are measured using the test leads in this setting  Move the dial to the voltage setting for AC or DC voltage. AC, or alternating current, voltage is used to measure things you might find around the house, like wall sockets, microwaves, and other home electrical appliances. DC, or direct current, voltage is most often used to measure circuits that are powered by batteries. DC voltage is therefore used in cars and in most electronic circuits.  Set the voltage range to a higher voltage than what’s expected. If you set the voltage range too low, you won’t get an accurate reading.  Touch the probes to both sides of a load or power source.  Read the voltage on the multimeter screen.  MEASURING CURRENT Plug in the test leads into COM and A or mA and turn the dial to Amps.  Touch the multimeter leads to the free terminals and read the current. Measuring Resistance Insert the black test lead in COM and the red test lead in the Ω terminal. Set the dial to a number on the multimeter resistance scale.  Place the probes on the resistor and read the resistance.  https://youtu.be/Hlna_kUt7As  https://www.devx.com/terms/circuit-tester/  https://www.hioki.com/sg-en/learning/test-tools/d-multimeters.html  https://www.wikihow.com/Use-a-Digital-Multimeter