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Is it all right to measure the Zener voltage via a resistor?

Latest Updated:02/01/2008

Question:

Is it all right to measure the Zener voltage via a resistor, as shown in the following diagram?

Answer:

When the Zener voltage is measured via a resistor, the Zener diode may be damaged by an overcurrent that is generated if the resistance is too low or if the supply voltage fluctuates.
Use of the following constant current source is recommended.
Note that the measured value may differ from the rated voltage if the temperature rises depending on the time of measurement.

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