On 28 Mayýs, 13:10, wrote:
I have a circuit that I built years ago. Rather than just replacing a
bunch of zener diodes, is there a way to test them in circuit, without
powering on the circuit?
I know that surface mount zeners fail shorted, but they can open if
there is enough current.
Can I just do a diode check at each polarity with a DMM to detect a
bad zener?
Thanks

using a multimeter, you can check the zener diodes. first get the true
values from a good one then compare the values.
while measuring, first make the forward-biased the diot then reverse-
biased.