EE331LE1rev6 - Experiment-1 Experiment-1 2-Terminal Device...

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Experiment-1 R. B. Darling EE-331 Laboratory Handbook Page E1.1 Experiment-1 2-Terminal Device Characteristics and Diode Characterization Introduction The objectives of this experiment are to learn methods for characterizing 2- terminal devices, such as diodes, observe some fundamental trends in the characteristics of various diode types, and to gain some familiarity with standard test bench instrumentation. Precautions None of the devices used in this set of procedures are particularly static sensitive; nevertheless, you should pay close attention to the circuit connections and to the polarity of the power supplies, diodes, and oscilloscope inputs. Part Numbers You may find that your lab kit may be missing the specific part number that is called out in the procedures. If this is the case, consult the parts list in the first section of this laboratory handbook for a possible substitution. If you are still confused as to which part to use, then consult the T.A.
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Experiment-1 R. B. Darling EE-331 Laboratory Handbook Page E1.2 Procedure 1 Measurement of diode reverse leakage current Set-Up Configure a DC power supply to produce an output voltage of VSS = +10.0 Volts. Verify this voltage with the bench DMM. If the DC power supply has a current limiting ability, configure the power supply to limit the current to 100 mA. Route the output of the DC power supply to your breadboard using two squeeze hook test leads. For this next procedure you will measure the leakage current of four different diodes. Each diode should be connected as shown in Fig. E1.1. Use the following parts: R1 = 1.0 M 1% 1/4 W D1 = 1N34A, 1N4004, 1N4148, or 1N5819 Use the solderless breadboard to connect the components, noting that each set of 5 vertically oriented holes constitutes a tie point. The horizontal rows of holes are all internally connected into a single tie point; these are normally used for power supply distribution. To attach test leads to the breadboard, you can use either the exposed end of a component lead, or you can insert a small pin into the appropriate tie point and connect the squeeze hook or oscilloscope probe to the pin. Connect up only one diode at a time in the circuit of Fig. E1.1, noting that the banded end of each diode is the cathode, which corresponds to the bar on the circuit symbol. Connect the DC power supply across both R1 and D1 and then connect the DMM across only R1 using two pairs of squeeze hook test leads as shown above. The DMM should read less than +10.0 V. Figure E1.1 DC SUPPLY VSS R1 1.0 M DMM (-) DMM (+) D1 TEST DIODE BREADBOARD Measurement-1 Measure the reverse leakage current for the 1N34A, 1N4004, 1N4148, and 1N5819 diodes. Do this by using the DMM to measure the voltage across R1 and divide this voltage by R1 = 1.0 M to obtain the current through R1, and
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Experiment-1 R. B. Darling EE-331 Laboratory Handbook Page E1.3 therefore the current through D1. Record your measurements and calculations in a table in your notebook. Question-1
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This note was uploaded on 09/10/2011 for the course EE 331 taught by Professor Taicheng during the Winter '08 term at University of Washington.

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EE331LE1rev6 - Experiment-1 Experiment-1 2-Terminal Device...

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