Using an Oscilloscope

# Using an Oscilloscope - Introduction Through this lab...

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1 Introduction Through this lab experiment we learnt the basic knowledge about diodes and how can we use diodes in circuit diagrams. When making this report I learnt about the types of diodes forward and reverse biased current and voltage characteristics of a P-N junction diode and also we learnt how to measure it by using X-Y current voltage curve .mode in oscilloscopes Parts and Equipment: Resistors : 1 kΩ Diode 1N4007 ( or equivalent) - 2 Transformer: Step-down transformer, approximately 12V secondary voltage High impedance digital multimeter Oscilloscope Soldering iron DC power supply Breadboard and wires Observations Nominal Values of the Resistor, Capacitor and DC power supply. Given Values Measured Values Resistor 1kΩ 0.999kΩ DC power supply 15V 15.08V Transformer secondary Voltage 12V 12.77V Table No 2.01 The circuit which we used for procedure #1 (DC Characteristics ). 1. Measured vlaues for V D and V R after seting +15V Componnent Value V S 15.08V V D 0.682V V R 14.39V Table No 2.02 Calculating I by applying V R and R to Ohm's law. ± ² ³

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2 ±² ³ ´ µ ± ¶·¸¹º³ »¸ººº¼½ ± ¶·¸·»··²¾ 2. Measured and calculated values after setting the voltage to -15V. Componnent Value V S -15.08V V D -15.07V V R 0.00V Table No 2.03 Calculating I by applying V R and R to Ohm's law. ³ ± µ ±² ³ ´ µ ± »¸»»³ »¸ººº¼½ ± »¾ 3. Procedure #2: dynamic Characteristics 1. The Circuit diagram which we used for procedure #2 Figure No 2.02 2. Graph which we got when we connect the circuit into Oscilloscope X-Y mode. Current -Voltage curve
3 Figure No2.03 X 1 = 640mV X 2 = 360mV Post Lab Exercise 1. What is the normal forward operating voltage of a standard silicon diode? A normal silicon diode has a forward operating voltage of (0.6-0.7)V . ( shown in Figure No 2.04) Figure No 2.04 2. Define the following terms: (a). Forward-biased . A forward-biased diode conducts current and drops a small voltage across it, leaving most of the battery voltage dropped across the components.

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4 Figure No 2.05(a) Figure No 2.05(b) (b). Reverse-biased. If the battery's polarity is reversed, the diode becomes reverse-biased, and drops
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## Using an Oscilloscope - Introduction Through this lab...

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