Exp1 - 1. Introduction to Electronics Laboratory Learning...

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1. Introduction to Electronics Laboratory Learning Objectives Basic operations of laboratory equipment Essential experimental skills Assignments Before the Laboratory Session Read “Laboratory Instruments.” Read “Breadboard.” Read “Components and Laboratory Practice.” Activities During the Laboratory Session Prototype Circuit Board Assemble the prototype circuit board. Align the tab of the insulating washer to the opening on the prototype board. Tighten the nut securely, preferably with a wrench. Make sure that banana jacks will never become loose, shift, and rotate in the socket. A wire with metal contacts on both ends connects the banana jack to the power bus on the board. Do not let the insulation of the wire slip into the jack preventing metal-to-metal contact. Between you and your partner, discuss how sockets of the prototype board are internally connected. Identify bus lines on the prototype circuit board. After you have done so, mark the check box below. Check box ------------------------------------------------------------------------------------------- Operations of Laboratory Equipment The function generator can produce sinusoidal, square, and triangular waveforms. You can adjust the frequency and amplitude. In addition to the ac signal, a dc offset can be added to the output waveform. In most experiments, the offset should stay at zero. However, when you need a digital clock signal, you need to adjust the amplitude and the offset to obtain a 0 to 5 V square wave. The function generator has an internal voltage source in series with an output impedance of 50 . The output will decrease when you attach a load resistance comparable to the output impedance. The oscilloscope presents the time dependence of waveforms. The dual trace oscilloscope in the laboratory can display two waveforms simultaneously, hence, facilitate timing measurements. The horizontal axis is controlled by the time base. Fast sweep is needed to 1
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display high frequency and transient waveforms. Slow sweep is used to display low frequency signals. The time base should be adjusted according to the frequency of the waveform or how fast the waveform changes. For sinusoidal waveforms, 5-10 cycles should be displayed across the screen. Turn on the computer, monitor, function generator, oscilloscope, and multimeter. Get two jumper wires with banana plugs from the drawer, one red and one black. Never pull or stretch any jumper wire. If one jumper wire is not long enough, just attach another and connect them in series. Always establish the signal ground first by connecting the black jumper wire from the ground tab of the output connector on the function generator to the ground tab or receptacle of the oscilloscope. Connect the red jumper wire from the output of the function generator to the channel one input of the oscilloscope. Press the “auto scale” key on the oscilloscope. You should have a waveform displayed. If not, ask a teaching assistant for help. Locate the readout for
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Exp1 - 1. Introduction to Electronics Laboratory Learning...

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