testing diodes with multi meter

[smackoj]

Hi old friends; I have a KMD GV60D hybrid amp (made in UK mid 80"s) SS preamp with 2-6L6 pwer tubes. I have the chassis out and was randomly checking diodes with my Fluke meter. I found 2 identical side by side on the power section board. One tests normal, short beep and a reading. The 2nd one has a long beep for as long as I hold the probe on it and it shows a much smaller reading than the first one. Is this continuous beeping telling me the diode is bad? I don't know if this is a Zener or not? I found a poor quality schemo but the board has no numbering on it so I am not sure where it's at on the schemo. It's a small diode and I cannot read the number as it sits on the brd.
Thanks amigos

[shooter]

to properly test a diode, one side needs to be lifted(out of circuit), using OHMS not continuity: one direction will read very high resistance(many k-ohms to infinity), reversing the leads should read a low resistance (ohms to hundreds of ohms)


zeners can only be tested for shorts with an ohm meter.

[smackoj]

Thanks Shooter that's good info.......much appreciatedJack D

[acheld]

Many Fluke multi meters have a diode testing function.   It works well, but I had to look at the manual to figure out how to use all the features, including what the sound meant. 

Go to Fluke.com, and use the fluke chat bot -- you can enter "user manual" and your model number and it will give you the link.   Really worth it.

[smackoj]

Good info. Thank you