Timeline for Two different LED types: diode test on two different multimeters shows just "1"
Current License: CC BY-SA 4.0
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| Aug 18, 2019 at 17:18 | history | edited | User323693 | CC BY-SA 4.0 |
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| Aug 18, 2019 at 14:07 | comment | added | Elliot Alderson | @KierenJohnstone You are missing the point. There is little value in measuring the Vf precisely because you are not going to drive the LEDs with a specified voltage. LEDs are current-driven devices...you provide a specified forward current and then measure whatever Vf you get. But you don't design the driver circuit to provide that exact voltage because you must control the current with the understanding that Vf will change a bit. | |
| Aug 18, 2019 at 10:39 | comment | added | User323693 | You can test them for your particular application. How much current are you planning? What is the source driving the LEDs? Are they only for the indication or for lighting? | |
| Aug 18, 2019 at 10:34 | comment | added | Kieren Johnstone | I don't have a datasheet, otherwise I wouldn't need to measure :) I got them from Aliexpress, and the seller hasn't responded to my requests. It sounds like a chicken-and-egg problem: do I use a random resistor and measure something like "a fair idea" of the Vf? The "diode test" function looked great for simply determining, quite precisely, the Vf. Is that the case / how can I replicate that? | |
| Aug 18, 2019 at 10:26 | history | answered | User323693 | CC BY-SA 4.0 |