Digital Multimeter Introduction Choosing the right meter Category

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Digital Multimeter Introduction • Choosing the right meter Category • Category ratings are designed

Digital Multimeter Introduction • Choosing the right meter Category • Category ratings are designed to protect users from transient overvoltage conditions (intermittent voltage spikes caused by electrical equipment surges during starting, capacitors, inductive circuits, and lightning strikes) • It is these unintended and intermittent transient voltage spikes that can be dangerous to users with too low of meter category rating

Digital Multimeter Introduction • Choosing the right meter Category 1. With the likely hood

Digital Multimeter Introduction • Choosing the right meter Category 1. With the likely hood of working in multiple different category environments always choose a meter that will be safe for working on the HIGHEST category that could potentially be accessed 2. Choose a Steady State Voltage rating that meets the maximum voltage you will encounter 3. ALWAYS choose the Category FIRST and then a steady state voltage value − A CAT III– 600 V meter will provide far superior transient voltage protection than CAT II– 1000 V meter

Digital Multimeter Introduction • Choosing the right meter Category 4. TEST LEADS: Be sure

Digital Multimeter Introduction • Choosing the right meter Category 4. TEST LEADS: Be sure your test leads have an equal, or HIGHER, Category and Voltage rating than the chosen meter – Meter system only as-good-as its components (as strong as the weakest link) – Quality Leads should be rated CATIII 1, 000 V and CAT IV 600 and UL Listed – Double insulated

Digital Multimeter Introduction 4. TEST LEADS: – Protective tips and accessory clips make connecting

Digital Multimeter Introduction 4. TEST LEADS: – Protective tips and accessory clips make connecting to circuits and components easier and safer, but change the category rating of the test leads. • With Protective tips: 1000 V CAT III & 600 V CAT IV • With. OUT Protective tips: 1000 V CAT II & 600 V CAT III (LOWER Rating)

Review for Understanding 1. What are the two types of signals commonly converted and

Review for Understanding 1. What are the two types of signals commonly converted and displayed on a DMM? 2. True of False: DMMs can measure a wide range of signals with accuracy. 3. How many ohms is 92. 2 kΩ 4. Explain the 4 basic operations DMMs help us to perform. 5. Define High Impedance. Why is it important when testing electronic circuits?