What do we normally assume to be the fwd drop of the usual LED, I assume IR, opto-isolated input?
Setting up stuff for the 2M542's target 10 ma thru its input opto's, I come up with about 360 ohms for the current limiter R when the 5 volts is 5.27, and the diode drop is nominally 1.6 volts. My old meter seems to have taken a hit, and my new one doesn't have the beans to measure a diode with more than about .85 volts for its band gap, so the diodes in the 2M542 are measuring either .75 volts if reverse biased, or open when conventional 'led' bias polarity is applied. To say I am a bit disappointed is an understatement, it is a $120 meter with all sorts of bells and whistles! Thanks guys. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> You can't take damsel here now. ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
