OHMMETER

• Multimeter


  Multifunction electrical measuring instrument with indication by means of an arrow (analog) scale

  
• Digital multimeter


  Modern, reliable measuring device characterized by high measurement accuracy and various functional capabilities

  
• Parts of ohmmeter/multimeter


  • Pointer
  • Ohmmeter scale
  • Zero ohm adjuster
  • Range multiplier
  • Test probes

  
• Pointer


  • Most important part of the multimeter/ohmmeter, indicates the value that has been measured
• Ohmmeter scale


  • Nonlinear scale where the reading of the resistance is based
• Zero ohm adjuster


  • Portion where the pointer is adjusted if it fails to point at zero
• Range multiplier


  • Portion where the actual reading is multiplied by the range value
• Test probes


  • Serve as the input of signal, connectors to terminals of the VOM and component's terminals or test points in a circuit to be tested
• Procedure to interpret resistance reading in an ohmmeter

  1. Know the value of individual calibration in the ohmmeter scale

  2. Identify the appropriate range multiplier to be used

  3. Connect the metallic part of the test probes and take note if the pointer points at zero, adjust if not

  4. Make the necessary resistance measurements

  
• Volts (V) measure the voltage or amount of force "pushing" through a circuit
• Amperes (amps) represent the current, or how many electrons are flowing through a circuit
• Ohms (Ω) measure the amount of resistance in the circuit; the higher the resistance, the more the circuit slows down the electricity
• Planning is the act or process of making a plan to achieve or do something, establishing goals, policies, and procedures
• Planning provides a structure and context for both teachers and students
• Lesson 1 is about hand tools