Multimeter Usage PDF

Multimeter Usage Aim: Learn to use a multimeter for the following tasks: 1. Test continuity of a cartridge fuse. 2. Test continuity of a slide wire bridge. 3. Measure DC voltage of different cells like Leclanché and Daniel cells. 4. Measure AC voltage from a step-down transfor...

Multimeter Usage Aim: Learn to use a multimeter for the following tasks: 1. Test continuity of a cartridge fuse. 2. Test continuity of a slide wire bridge. 3. Measure DC voltage of different cells like Leclanché and Daniel cells. 4. Measure AC voltage from a step-down transformer. Apparatus Required:  Multimeter  Cartridge fuse  Slide wire  Cells: Daniel cell, Leclanché cell, dry cell  Step-down transformer Theory: A multimeter is a versatile instrument that can measure: 1. Current (ammeter), voltage (voltmeter), and resistance (ohmmeter). 2. Both AC and DC voltages or currents. 3. Knob rotation: o Changes the ammeter range by adjusting the shunt resistance. o Changes the voltmeter range by varying resistance in series with the coil. 4. Continuity test: o If resistance is very low, the circuit is complete, and the multimeter beeps. o If no beep, the circuit is broken or has infinite resistance. Procedure: 1. Continuity Test:  Purpose: Check if the circuit is complete.  Steps: 1. Set the multimeter to continuity mode. 2. Touch the probes together to ensure the multimeter is working (a beep confirms). 3. Place probes on the two ends of the wire or connection to be tested.  Beep sound: Circuit is complete (low resistance).  No beep: Circuit is broken (high or infinite resistance). 2. DC Voltage Measurement:  Purpose: Measure voltage of cells.  Steps: 1. Set the dial to DC Voltage mode. 2. Connect the red probe to the positive terminal and the black probe to the negative terminal of the cell. 3. The display will show the voltage. 3. AC Voltage Measurement:  Purpose: Measure voltage from a transformer.  Steps: 1. Set the dial to AC Voltage mode. 2. Insert the probes into the secondary terminals of the step-down transformer. 3. Note the reading on the display. Result: 1. Checked continuity of a fuse and slide wire bridge. 2. Measured DC voltage of various cells. 3. Measured AC voltage of a step-down transformer.