# Difference between revisions of "Lab 8 TF EIM"

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− | + | 1.) Plot the reverse biased diode for voltages beyond the turn on voltage in order to measure the effective impedance of the diode assuming a linear fit. | |

− | + | 2.) Plot the forward biased diode in order to measure the effective impedance of the diode assuming a linear fit. | |

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[[Forest_Electronic_Instrumentation_and_Measurement]] | [[Forest_Electronic_Instrumentation_and_Measurement]] |

## Revision as of 02:51, 16 February 2011

Lab 8 The Diode Objective: Measure the current-voltage curve of a silicon diode.

# Reverse current

1.) Construct the circuit below using a DC power supply, a diode.

2.) Attach an Oscilloscope with internal resistance

. The scope will measure the voltage drop across R and thus the current will be given by this voltage difference divided by R.3.) Determine a value for R which will allow you to measure a current of at least 10 mA (prefeferably 50 mA) at the diodes reverse bias cut off voltage.

4.) Measure the diode reverse current as a function of the DC supply voltage. (30 pnts)

Bias Voltage | V_{scope} | Current (V/R) | Diode power | R power |

5.) Fill in the blank. The reverse biased diode act as a constant _______________ source. (5 pnts)

# Forward Current

1.) now swap the diode direction and repeat the measurement in the previous section.

2.) Attach an Oscilloscope with internal resistance

. The scope will measure the voltage drop across R and thus the current will be given by this voltage difference divided by R.3.) Determine a value for R which will allow you to measure a current of at least 10 mA (prefeferably 50 mA) at the diodes reverse bias cut off voltage.

4.) Measure the diode forward current as a function of the DC supply voltage. (30 pnts)

Bias Voltage | V_{scope} | Current (V/R) | Diode power | R power |

5.) Fill in the blank. The forward biased diode act as a constant _______________ source. (5 pnts)

# Graph

- Plot the diode current (on the ordinate) versus the diode voltage (on the abscissa)for the forward and reverse biased diode on the same graph. (50 pnts)

# Questions

1.) Plot the reverse biased diode for voltages beyond the turn on voltage in order to measure the effective impedance of the diode assuming a linear fit. 2.) Plot the forward biased diode in order to measure the effective impedance of the diode assuming a linear fit.