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You are here: Home / Replies / i am using Zener Diode SMAZ30

i am using Zener Diode SMAZ30

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Electronics › Electronics › How to measure a ziner impedence accurately › i am using Zener Diode SMAZ30

May 16, 2011 at 7:24 am #6229
Muhammad Faheem Arshad
Participant

i am using Zener Diode SMAZ30 and i am measuring its impedence at test current 25 mA. The impedence should be less then 15  ohm but every time i am getting a higher impedence because zener heats up too much.

I tried to turn off power supply very rapidly to avoid heating but the minimum value i got through was 35 ohm.  

The method i used is zener diode and a resistor of 1K in series. I took 2 zener voltage values 1 at 26 mA and the 2nd at 24 mA and then used the following formula.

 

       Zzt = Vz@26mA-Vz@24mA

                     26mA-24mA

 

Do you know any good method to measure its impedence ????

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