On 22.07.11 10:30, Dave wrote: > Interesting.. so did you have to make any design changes to meet the > 95% RH requirements??
No, the LED clock dissipated enough heat to avoid condensation at 95% RH. With purely dissipative dropping of the 12v to the <2v across each display segment, it effectively had an inbuilt heater. The PCB was covered in solder resist, which excluded moisture from circuit tracks, as well. [...] > I wasn't aware of the load dump situation. Fortunately my past mobile > work has used a 12 to 24 volt inverter to drive the control circuits, > otherwise that probably would have been an issue. As it still lives, the inverter is either adequately protected, or hasn't experienced a load dump yet. If there's a hefty lead-acid battery in your equipment module, then it would probably absorb a load dump from the alternator, if it's in good nick. (Internal impedance low.) Erik -- Westheimer's Discovery: A couple of months in the laboratory can frequently save a couple of hours in the library. ------------------------------------------------------------------------------ Storage Efficiency Calculator This modeling tool is based on patent-pending intellectual property that has been used successfully in hundreds of IBM storage optimization engage- ments, worldwide. Store less, Store more with what you own, Move data to the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
