Introduction to Laboratory Equipment - Laboratory 1 | PHY 116A, Lab Reports of Basic Electronics

Download Introduction to Laboratory Equipment - Laboratory 1 | PHY 116A and more Lab Reports Basic Electronics in PDF only on Docsity! 2 Lab 1: Introduction to Lab Equipment U.C. Davis Physics 116A INTRODUCTION The purpose of this first lab is to become familiar with the standard equipment of an electronics lab. You will use the multimeter, function generator, and oscilloscope. 1. ACCURACY OF THE MULTIMETER Set the voltage on the breadboard to an arbitrary voltage between 10V and 14V. Measure this voltage with at least 5 different multimeters. Optionally, measure the voltage using different probes, wire lengths, voltage ranges, etc. For your report, list your voltage measurements, give the average and the range of values, and from this determine the accuracy of a voltage measurement. 2. LOADING Construct the circuit shown in figure 1. (Note that the "resistance of multimeter" is not an actual resistor you put in the circuit; it is the multimeter itself.) Calculate the voltage V if the multimeter wasn't in the circuit. What is the measured voltage V? For your lab report, calculate the resistance of the multimeter using the measured value of V. + 10V = 10M = 10M Ω Ω V R R 1 2 Resistance of Multimeter Figure 1: Circuit for demonstrating multimeter loading. This effect is called "loading". As an additional demonstration of this effect, try measuring V with two multimeters simultaneously and see how the measured value of V changes. Unfortunately, we can never make truly "ideal" measurements which don't perturb the system we are measuring. 3. USING THE OSCILLOSCOPE FOR D.C. VOLTAGE MEASUREMENTS Repeat the experiment of section 1 using oscilloscopes instead of multimeters. You only need to use two different 'scopes, but have at least three different people read the voltage for each. For your lab report, list these voltage measurements, their average and their range, and compare the precision of the oscilloscope to that of the multimeter. 4. OSCILLOSCOPE LOADING Repeat the experiment of section 2 with the o-scope in place of the multimeter. I recommend using 1 MΩ resistors instead of the 10 MΩ ones. 5. USING THE OSCILLOSCOPE FO R A.C. VOLTAGE MEASUREMENTS (A PICTURE IS WORTH A THOUSAND NUMBERS.) Use a triangle wave of about 1 kHz from the function generator (MAIN output) fed into the oscilloscope (channel 1 input). Try to produce a trace on the oscilloscope that looks as much like the one in figure 2 as you possibly can. For your lab report, record the settings you used on the oscilloscope (horizontal scale, vertical scale, trigger mode and level, input coupling, and any other setting you think is important). Also record the peak voltages and the frequency of your signal. Figure 2: Desired oscilloscope trace Next, use the function generator's SYNC output as the oscilloscope's channel 2 input. Adjust the oscilloscope's display so that both traces are visible and easy to compare. Trigger on the channel 1 input. For your lab report, draw what you see, labeling each trace