Using a Digital Multimeter DMM Source http bidyutroboguru

Using a Digital Multimeter (DMM)

Source: http: //bidyut-roboguru. blogspot. com/2014/07/how-to-use-multimeter. html

DMM Display Multimeter consists of: Display • • (1) Digits (6) Negative indicator (15) Measurement units (3) Continuity beeper Selection Knob Ports Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Selection Dial Multimeter consists of: Display Selection Knob • • • (1) ON/OFF (6, 7) AC voltages (8, 9) DC voltages (12) Resistance (14) Diode (15, 16) Current (move leads to correct ports!) Ports Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Ports Multimeter consists of: Display Selection Knob Ports • • Common Voltage Current (A , m. A/�� A) Read carefully! Meters have different port configurations. Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Measurements Using Selector dial and connecting to various ports allows you to measure the basics: • Resistance (Ω) • Voltage (V) • Current (A) Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Measurements: Continuity Measure Continuity: • Test fuses • Open or completed electrical connections • Ring out a wire to identify Connect to Com and V ports, and set selector switch to: Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Measurements: Resistance (Ω) • Deenergized circuits only! • Check resistor values • Check for open circuits • Check for adequate ground connection Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Measurements: DC Voltage ( ) • Check for Voltage within a circuit • Leads are in parallel with circuit Connect to “Com” and “V” ports, and set selector switch to: or m. V Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Measurements: AC Voltage ( ) • Leads are in parallel with circuit • Connect to Com and V ports, and set selector switch to : or m. V Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Measurements: Current • Check for Current within a circuit or branch Note: If a meter includes fused current terminals, verify that its fuses are good. • Leads are in series with circuit • Current flows through the meter! Connect to Com and (10 A/A) ports. Set selector switch to mÃ/Ã for AC amps; or m. ADC for DC amps. Source: http: //en-us. fluke. com/products/digital-multimeters/ and http: //www. extech. com/display/? id=14821

DMM Measurements: Current • Most DMMs can only measure dc or ac current up to 10 A. • For higher currents, the accessory current clamp reduces measured current by a fixed ratio. • Clamps measure current in a circuit by measuring the strength of the magnetic field around a single conductor. Source: http: //en-us. fluke. com/training-library/test-tools/digital-multimeters/how-to-measurecurrent-with-a-digital-multimeter-plus-clamp-accessory. html

DMM Don’ts Source: https: //www. allaboutcircuits. com/textbook/direct-current/chpt-3/safe-meter-usage/

DMM: Check Internal Fuses Note: If a meter includes fused current terminals, verify that its fuses are good. To test internal fuses: • Set selector dial to Ω setting • Connect single lead between common port and amp port https: //www. youtube. com/watch? v=I 6 XCDj 7 m 2 LA Source: https: //www. youtube. com/watch? v=I 6 XCDj 7 m 2 LA