Lab 11 TF EIM

The Zener Diode

$I_{Zmax}$

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

Zener Voltage Regulator

1. Add a Zener diode to an unregulated power supply as shown below
2. Use a value for $R$ to have $I_L \approx 20$ mA
3. Measure $V_Z$ for $I_L$ = 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 $R_L \rightarrow 0$.

Forest_Electronic_Instrumentation_and_Measurement