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introduction - Memorial University of Newfoundland...

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Memorial University of Newfoundland Department of Physics and Physical Oceanography Physics 2055 Laboratory Introduction to the Laboratory The purpose of this lab is to introduce you to some of the equipment which you will be using throughout the semester. By the end of this session you should know how to: 1. use the low voltage power supply and breadboard to construct a simple circuit; 2. use the digital multimeters to measure voltage, current and resistance at various points in a circuit; 3. debug a circuit if anything appears not to work. Power Supplies The B+K Precision Triple Output DC Power Supplies provide two main supplies with a 0–30 V dc output and a third with a 4–6.5 V dc output. The main supplies are adjustable with both coarse and fine voltage controls and are capable of current output 0–2 amps. Two LED meter displays can monitor either the output current or output voltage of each supply. The third has a current output up to 5 amps, allowing it to handle extensive digital logic circuitry. The two main supplies can be operated independently or in one of two tracking modes. In the series tracking mode, the “A” and “B” supplies are connected in series, allowing a single output of 0–60 V at up to 2 amps. In the parallel tracking mode, the two supplies are connected together in parallel, allowing a single 0–30 V output at up to 4 amps. Connection is made using either a banana plug inserted into the appropriate ‘+’ or ’ - terminal or by connecting a short wire from the terminal to the breadboard. The central green terminal (GND) will normally not be used. Breadboards The name “ breadboard ” comes from the days when electrical components were attached by screws to large wooden boards. Modern breadboards are small plastic rectangles with 1
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Figure 1: Low voltage power supply used in the laboratory holes for connecting wires. They come in different sizes; the most common size used in this laboratory has two rows each of 50 holes along the top and bottom, and 64 columns of ten holes, separated into two groups of five. Behind each hole is a small spring which contacts any wire pushed into the hole. This spring is connected to neighbouring holes so that there is an electrical connection between wires pushed into adjacent holes. Fig (2) shows a section of the breadboard. Note that the holes are usually connected in groups of five, so that Figure 2: Diagram to show the connections between the holes in a breadboard. you can connect up to five wires at one point. The rows of holes at the top and bottom of the breadboard are normally used to provide high voltage and ground connections. The breadboards are provided with eight dummy terminals which allow you to connect a power supply to the circuit which you have constructed.
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