[sdiy] How much DMM accuracy do you need?

[cheater cheater]

Adam,
I have of course thought of this as well, but then I remembered that
you actually need to ship the bugger... Do you think that with
trimpots etc a tuning of 5.0xyz volt will survive handling by UPS?

D.

On Wed, Oct 7, 2009 at 7:22 PM, Adam Schabtach <lists at studionebula.com> wrote:
> It is true that you can calibrate your VCOs to your MIDI-CV converter
> without an accurate meter because you're making the system internally
> consistent. As I see it, you need the meter in two circumstances:
> 1) You're working on equipment that you might give/sell to someone else.
> 2) You happen to change MIDI-CV converters, you notice your oscillators are
> no longer tracking correctly, and you want to know whether some highly rated
> commercial MIDI-CV converter is at fault, or whether it turns out that your
> cheap homebrew converter is actually more accurate. Does this sound like a
> true story? It is. :-)
>
> I don't know of a way to _test_ resistors without an accurate meter. It
> seems, though, that you could _match_ resistors without a super-accurate
> meter. Does that make sense?
>
> --Adam
>
>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl
>> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of
>> cheater cheater
>> Sent: Wednesday, October 07, 2009 10:12 AM
>> To: synth-diy
>> Subject: Re: [sdiy] How much DMM accuracy do you need?
>>
>> Exactly. You don't need a super expensive DMM for setting up
>> the 1V/Oct output of a midi-cv converter, just need to be
>> able to use other tools to the same effect...
>>
>> What other situations require high accuracy? I guess low
>> tolerance resistors.. wonder whether there's a way to test
>> those without a perfect multimeter.
>>
>> D.
>>
>> On Wed, Oct 7, 2009 at 4:06 PM, Jay Schwichtenberg
>> <jays at aracnet.com> wrote:
>> > I go sillyscope for course freq and a guitar tuner or by ear
>> > (providing I have a reference osc) for fine tuning. Getting
>> > instrumentation that could measure stuff as good as you
>> want it is going to cost a lot.
>> >
>> > Jay S.
>> >
>> >> -----Original Message-----
>> >> From: synth-diy-bounces at dropmix.xs4all.nl
>> >> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of
>> Justin Owen
>> >> Sent: Wednesday, October 07, 2009 4:08 AM
>> >> To: cheater cheater; synth-diy
>> >> Subject: Re: [sdiy] How much DMM accuracy do you need?
>> >>
>> >>
>> >> -----Original Message-----
>> >> From: cheater cheater [cheater00 at gmail.com]
>> >>
>> >> >OK. How much accuracy do you *really* need there?
>> >>
>> >> IMHO "need" is a relative term. I managed to build my first few
>> >> synths with no more test kit than a £5 logic probe and a £3 DMM
>> >> (which has since been replaced - but still gets used).
>> >>
>> >> The next few builds *needed* an oscilloscope - so I bought
>> a 2nd hand
>> >> 20Mhz dual trace scope. I couldn't get by without it now and I'm
>> >> looking at buying a second, better, 4 trace scope.
>> >>
>> >> For my current project - there's no way I could complete
>> it properly
>> >> without a dedicated frequency counter.
>> >>
>> >> Perhaps this is more of an observation than an answer... :)
>> >>
>> >> Justin
>> >>
>> >>
>> >>
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>> >
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