[volt-nuts] MicroVolt meter

Pete Lancashire pete at petelancashire.com
Thu May 5 15:13:35 UTC 2011



I too could not find it on the TI site


On Wed, May 4, 2011 at 7:55 AM, Dave M <dgminala at mediacombb.net> wrote:
>> From: shalimr9 at gmail.com
>> Subject: Re: [volt-nuts] MicroVolt meter
>> There are 24 bits ADCs available. One I have used is the MSC1210 fromD
>> TI. It is actually an ADC with an 8051 processor integrated (with
>> Flash and RAM). There are many more. You can probably buy a cheap
>> development kit. I paid $50 for mine.
>> Didier KO4BB
>> Q
>> Sent from my BlackBerry Wireless thingy while I do other things...
>> -----Original Message-----
>> From: Fred Schneider <pa4tim at gmail.com>
>> Subject: [volt-nuts] MicroVolt meter
>> Am I a dreamer if I think there must be a way to build a digital or
>> analogue meter that has a resolution of 0,1 uVDC and a max input of 2
>> V in that range, and 1 uV at a 20 V range.
>> Used bench meters with that resolution are scares and new ones made
>> of plain gold.
>> I was thinking of using a modern chopper opamp. LTC1051 with LT1007.
>> Or a TL7652.
>> Maybe two that split up the voltage and then to two ADC's. Wilkinson
>> version ? The result to an Arduino for the readout and combining of
>> the most and least significant digits.
>> But I'm an RF head, i can make 1GHz oscillators, but digital stuff is
>> rather new for me ( I can program a little in C).
>> Other idea
>> A 845AB meter can reach 1 uV full scale, but that is nice as null
>> detector. You can not measure the voltage of a 1 V calibrator direct.
>> There should be a way to use that thechnique. For instance make
>> something for that meter, a sort attenuator or divider or subtractor
>> and let it switch automatic through it ranges. The 845 stays in 1 uV
>> range but the Attenuator switches from the 10 V to 1 uV range. The
>> measurements from the recorder output to a uProcessor that combines
>> all the results. So in the 10 V range it measures 3.53V, we keep the
>> 3.  in the 1 V ranges it sees 0,534V. We keep the 5, in the 1 mV
>> range it sees 0,0346, we keep the 3 ect upto 0.1 uV.
>> A sort of sample and hold that we use in a later stage to subtract
>> from the next input.
>> Fred PA4TIM
> The 24-bit ADC is a good idea.  I was investigating the MSC1210 a couple of
> years ago when I ran into medical problems, and just never got back to it.
> I did a quick search for the eval kit but couldn't find any available.  Does
> anyone know of a source (reasonably priced, of course)?
> David
> dgminala at mediacombb dot net
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