Inspection Instruments

For inspection, use the following instruments:

Fig 1: Identifying Test Light

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1. Test light

   A test light consists of a 12V bulb and lead wires. It is used to check voltages or short circuits.

   Fig 2: Identifying Self-Powered Test Light

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2. Self-powered test light

   A self-powered test light consists of a bulb, battery and lead wires connected in series. It is used to check continuity or grounding.

   Fig 3: Identifying Jumper Wire

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   CAUTION: Never use a jumper wire to connect a power supply directly to a load.
3. Jumper wire

   A jumper wire is used to close an open circuit.

   Fig 4: Measuring Circuit Voltage Using Voltmeter

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4. Voltmeter

   A voltmeter is used to measure the circuit voltage. Normally, the positive (red lead) probe is applied to the point of voltage measurement and the negative (black lead) probe to the body ground. Use a digital voltmeter to check for voltage drop before or after a component.

   Fig 5: Checking Continuity/Measuring Resistance Of Switch Or Coil Using Ohmmeter

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5. Ohmmeter

An ohmmeter is used to check continuity or measure resistance of a switch or coil. If the measuring range has been changed, the zero point must be adjusted before measurement.