italie |
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MAME owes italie many thank yous, hah
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Reged: 09/20/03
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Posts: 15246
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Loc: BoomTown
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Re: HELP:Measuring refresh rate of PCBs
01/04/11 08:40 PM
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> > Floating values could be a function of the PCB, tthe quality of the input signal,
> the
> > connections, the impedance/capacitance of the probe wire, improper
> > coupling/grounding...etc.
> >
> > If you don't have access to a scope, I'd start by filtering the input pin as shown
> on
> > page 7 (below) with a 620 Ohm resistor and a 510pf capacitor to make sure your
> imput
> > is clean.
> >
> > http://www.national.com/ds/LM/LM1881.pdf
>
> Ok thanks, I'll try filtering the input..but capacitors must be polarized or normal
> ceramic?
Ceramic is fine.
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