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How to Calculate Internal Voltage

Internal voltage can be calculated by using a device called a Zener diode. It is used to conduct and regulate voltage. Testing the voltage of a Zener diode is done by using a multimeter. To do this, you can build your own internal circuit using a resistor and a 9-volt battery. However, you will require materials for the project that you can obtain from an electrical supply store.

Things You'll Need

Multimeter
Zener diode
9-volt battery
200-Ohm resistor
Electrical wire

Instructions

- 1
  Turn the dial on the multimeter to the "diode" setting. Most types of multimeter will have a symbol of a diode case
- 2
  Place the red-colored probe of the multimeter on the anode side of the diode. This will be the unmarked side of the diode. Place the black-colored probe on the cathode side of the diode. This is indicated by a stripe on the diode.
- 3
  Read the display on the multimeter. The diode should have a forward-biased reading of 0.5 to 0.7 volts.
- 4
  Place the red-colored probe of the multimeter on the cathode side of the diode. Place the black colored probe of the multimeter on the anode side of the diode.
- 5
  Read the display on the multimeter. The diode should have a reverse-biased reading of infinite resistance or no current flow.
- 6
  Attach one side of the resistor to the "Positive" terminal of the 9-volt battery. Attach the cathode side of the Zener diode on the other side of the resistor. Connect an electrical wire from the anode side of the diode to the "Negative" terminal of the battery.
- 7
  Turn the dial on the multimeter to the setting for "DC Voltage." Touch the probes of the multimeter to the Zener diode.
- 8
  Read the display on the multimeter. The voltage reading should be between 5.32 and 5.88 volts across the diode.

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