[volt-nuts] MicroVolt meter

Pete Lancashire pete at petelancashire.com
Thu May 5 15:22:10 UTC 2011


On Thu, May 5, 2011 at 8:13 AM, Pete Lancashire <pete at petelancashire.com> wrote:
> David,
> http://parts.digikey.com/1/parts/404702-eval-mod-msc1210-msc1210-daq-evm.html
> I too could not find it on the TI site
> -pete
> 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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