TAILIEUCHUNG - Lab 3.1.3 Resistance Measurement

The digital multimeter is a versatile testing and troubleshooting device. This lab covers resistance measurements and related measurements called, continuity. Resistance is measured in Ohms, indicated by the Greek letter Omega or Ω. Copper wire conductors such as those commonly used in network cabling, normally have very low resistance or good continuity when checked from end to end. If there is a break in the wire, it is called “open,” which creates very high resistance. Air has nearly infinite resistance, indicated by the infinity symbol or ∞. | Cisco SrsTEMS Lab Resistance Measurement Objective Demonstrate the ability to measure resistance and continuity with the multimeter. Background The digital multimeter is a versatile testing and troubleshooting device. This lab covers resistance measurements and related measurements called continuity. Resistance is measured in Ohms indicated by the Greek letter Omega or Q. Copper wire conductors such as those commonly used in network cabling normally have very low resistance or good continuity when checked from end to end. If there is a break in the wire it is called open which creates very high resistance. Air has nearly infinite resistance indicated by the infinity symbol or The multimeter has a battery inside. The battery is used to test the resistance of a wire conductor or wire sheathing insulator. When the probes are applied to the ends of a conductor the battery current flows and the meter measures the resistance encountered. If the battery in the multimeter is low or dead it must be replaced or the multimeter will not be able to take resistance measurements. With this lab test common networking materials to become familiar with them and their resistance characteristics. First learn to use the resistance setting on the multimeter. Note the continuity feature as small resistances are measured. The instructions provided are for the Fluke 110 and 12B. Other meters will function in a similar way. 1 - 3 CCNA 1 Networking Basics v - Lab Copyright 2003 Cisco Systems Inc. Prior to starting the lab the teacher or lab assistant should have one multimeter available for each team and various networking-related items for testing resistance. Work in teams of two. The following resources will be required Fluke 110 Series or 12B multimeter or equivalent 1000 Ohm resistor 10 000 Ohm resistor Pencil for creating graphite paths on paper Cat 5 jack or approximately 6 to 8 inch section of Cat 5 UTP solid cable BNC terminated coaxial cable Unconnected DB9 to .

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