----- Original Message ----- =

From: "Ruben J=F6nsson" <ruben@pp.sbbs.se>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Monday, May 10, 2010 7:27 AM
Subject: Re: [EE] Microchip boost converters


>
>> Be sure to measure Vin on the circuit side of any Iin ammeter.
>> Be aware that high frequency power supply noise on power wiring (in
>>and out) can play havoc with some meters). Largish cap (100 uF?)
>> across meter terminals can help.
>
>.
>
>>               Russell
>
> -- =


>Since the noise most likely is in the 100s of MHz range, a smallish cap =

>perhaps
>would be better. A ferrite clamp can also help.

Yes, Anything low ESR would seem to me be the best option. I think most low =

voltage, large caps are (<0.5ohm), but you get an odd one now and then that =

can be very high ESR (especially old ones, as they deteriorate with age), =

but keeps it's rated capacitance. Maybe a large cap and a small ceramic =

would be in order just to be sure. ESR meters are always a handy tool.. =



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