Photodiode terminals

[walid]

If I have a photodiode on my table, how can i identify its cathode and anode using didital multimeter?
tanks.

[Guest Alun]

Just use the diode setting.

[walid]

No no no Alun
If i removed one from some board and want to reuse it how can I identify its K &A

[audioguru]

Set the multimeter to its "diode test" function and measure the photodiode connected both ways. It will conduct only when its anode is positive, like any other diode.