How do you measure Diodes with a DVM/Multimeter?

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Hi,
I have been wondering for some time now how I would go about either measuring Diodes OUT OF or IN a circuit. They all (originally) have Maximum Voltage and Current(Amperage) ratings, but that is about all I know...
If I HAVE diodes that are IN a circuit to begin with (and don't know what their values are), what is it that I should be measuring for to determine replacement values? Also, should the unit be ON and powered up or can I get measurements with it off? (It is a McIntosh Tuner-Preamp)
I have a Diode symbol on my Radio Shack Digital Volt/Multi-Meter, but don't know how I would use this...
Basically, I would like to be able to determine the values from the original parts so that I may replace them if necessary. This includes Diodes in the Filament Supply, Power Supply (for a Bridge rectifier), and those in the Tuner section as well (Small glass(germanium?) diodes).

Can I measure the voltage and current coming INTO (before) the rectifier to figure the values out? This way, I can figure out these values on my own, no? How would I best take these measurements?
Thanks for your input,
Brian M

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Topic - How do you measure Diodes with a DVM/Multimeter? - BrianM23@msn.com 04:29:45 02/25/02 (4)

I use a magnifying glass - Batman 11:47:34 02/25/02 (0)

Re: How do you measure Diodes with a DVM/Multimeter? - mikedale 08:34:32 02/25/02 (2)

Re: How do you measure Diodes with a DVM/Multimeter? - Corbett 10:17:34 02/25/02 (1)

Re: How do you measure Diodes with a DVM/Multimeter? - . 02:50:40 02/26/02 (0)

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