Electronics

Module 2 Lab: Resistor and Diode Characteristic

A.   Take data to plot current vs voltage  for a  220 Ω  resistor.

You may need to use a series combination to obtain the 220 Ω resistance.  Since the Diligent virtual ammeter is not accurate, you must use your mulitmeter (set to measure DC mA) to record or set currents.

Set     V=	1v	2v	3v	4v	5v
Record I (mA)

· Reverse the battery polarity, and the ammeter.  The voltmeter will read negative values

Set     V=	-1v	-2v	-3v	-4v	-5v
Record I (mA)

· Plot the Resistor Characteristic as I vs V

· Use 0.5 volts per division on the V (X axis) and 2 mA per division on the I (Y axis).

· Calculate the slope of this straight line: ΔI/ΔV =  _______ this equals the conductance G.

· From this value of G, calculate R= 1/G = _____.

B.  Take data to plot current vs voltage for a diode.       

Adjust the power supply so the current equals 1 mA and record the diode voltage Vak

Continue to increase I and record Vak  to fill in the table below:

I (mA)	0.1	0.2	0.3	0.4	0.5	1.0	2.0	4.0	6.0
Vak

I (mA)	8.0	10	12	14	16	18	20	23

Reverse the battery polarity and the ammeter.   If the ammeter reads less than 1mA record it as 0

Set  Vak  =	-5v	-10v	-15v
Record I =

For reverse bias notice that the current is virtually zero for any voltage.

Plot the Forward Bias Diode Characteristic in two plots:

#1  For the diode current from 0 mA to 2 mA

     Use 0.1mA per division for the Y axis and 0.1v per division for the X axis.

#2  The second plot will be for the current from 0 mA to 25 mA

     Use 1mA per division for the Y axis and 0.1v per division for the X  axis.