Multimeter PDF

Multimeter  Multimeter -an electronic tool used to measure voltage, amps and resistance across circuits -Attached the two leads to different parts of an electrical system. -volt-ohm meter or volt-ohm- milliammeter (VOM)  Two types of Multimeter 1.Analog Multimeter - P...

Multimeter  Multimeter -an electronic tool used to measure voltage, amps and resistance across circuits -Attached the two leads to different parts of an electrical system. -volt-ohm meter or volt-ohm- milliammeter (VOM)  Two types of Multimeter 1.Analog Multimeter - Prone to error because of wrong pointer based reading. -Provides reading on a scale against pointer. -Calibration is done manually. -Displays only one input signal value.  Types of Multimeter 2. Digital Multimeter -Measures with great accuracy. -Provides reading in numeric form appeared on an LCD. -They are calibrated automatically before taking any measurements.  Types of Multimeter 2. Digital Multimeter -It is able to accept multiple inputs and has adjustable displays which allow user to choose between the input signals.  Parts of a Mulitimeter *Pointer- the needle-shape rod that moves over the scale of a meter. *Range Selector Knob- also called a Selector switch; To select different function and range of the meter. *Adjustment Screw- to adjust the pointer to the zero position of the scale. *Scale- a series of marking used for reading the value of quantity.  Parts of a Mulitimeter Test Probe- Positive (red), Negative (Black), used to connect the circuit to the electrical components being tested. Zero-Ohm Adjustment Knob- used to zero-in the pointer before measuring resistance.  Multimeter Usage Multimeter as Voltmeter 1.Determine if the voltage is AC or DC. 2.Using the range selector knob, set the range. 3.For DC devices, determine the polarity. 4.Connect the probes to the device to be measured. 5.Read the value  Multimeter Usage Multimeter as Ammeter or Current Measurement 1.Set the range using the range selector knob. 2.Determine the direction of the current in the circuit. 3.Break the circuit, and read the value.  Multimeter Usage Continuity testing is used when checking the conection of a cable or any conductors to ensure both ends are connected properly. 1.Set your analog tester to Rx 1 ohms. 2.Collaborate your tester by touching the red and black probes together. The pointer should deflect to 0 ohms.  Multimeter Usage 3. Connect the tester probes to the points or terminals where the continuity is to be checked. Continuity checking is not applicable to polarity. 4. The test should measure O ohm. This means no connection or broken. However, if the pointer does not deflect, it means that the connection is open or the wire connection is cut.  Multimeter Usage Multimeter as Ohmmeter 1.Disconnect the component of the circuit that you need to measure. An ohmmeter does not function when the circuit is connected to a power supply. 2.Set the range of the ohmmeter. 3.Check the pointer if it exactly rest at O or infinite position. Wrong setting will cause inaccuracy to measured value.  Multimeter Usage If not, turn the zero-ohm adjuster in counterclockwise or clockwise until the pointer points at infinite position. This called calibration. 4. Connect the probes to the terminals of the component or the ends of the resistor. 5. Read the value. Thank You