Lab 11 TF EIM

The Zener Diode

[math]I_{Zmax}[/math]

1. Construct the circuit below making sure the zener diode is oriented correctly.
2. Choose a resister [math]R[/math] which will allow you to cover the range [math]I_Z \approx 1 mA[/math] and [math]I_Z\approx \frac{1}{2} I_{Z max}[/math] for the voltage range of your power supply.
3. use a a digital multimeter to measure [math]V_z[/math] for several values of [math]I_z[/math].

Zener Voltage Regulator

1. Add a Zener diode to an unregulated power supply as shown below
2. Use a value for [math]R[/math] to have [math]I_L \approx 20[/math] mA
3. Measure [math]V_Z[/math] for [math]I_L[/math] = 1, 10, and 20 mA
4. Tabulate your data and include the ripple.

Questions

1. Derive I_L= \frac{V_a-V_Z}{R}-I_Z
2. What happens if [math]R_L \rightarrow 0[/math].

Forest_Electronic_Instrumentation_and_Measurement