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Hi:
What is the smallest physically-possible voltage that can be detected
or processed given the state of today's technology?
Thanks
On Mon, 1 Jun 2009 17:15:19 -0700 (PDT), GreenXenon
You can buy nanovoltmeters that will resolve a couple of hundred
picovolts, if you're careful.
Superconductive SQUID detectors can measure a picovolt.
Single-electron transistors can sense, well, single electrons.
John
On Mon, 01 Jun 2009 17:40:20 -0700, John Larkin
PMTs can be good enough to detect single photon events.
On Jun 1, 10:33=A0pm, ItsASecretDummy
Hmmm... I have a $35 digital multimeter that can measure exactly 0
volts!
Rick
rickman wrote:
No, it can't. It can display zero, even with some voltage at the
input. The issues is the resolution of the meter. Even with the probes
shorted, you will have some Johnson noise which is generated by the
resistors in the input circuitry, if the meter is above absolute zero
degrees. That voltage is too low to be displayed, but it is still there.
--
You can't have a sense of humor, if you have no sense!
What is the smallest physically-possible voltage that can be detected
or processed given the state of today's technology?
Thanks
On Mon, 1 Jun 2009 17:15:19 -0700 (PDT), GreenXenon
You can buy nanovoltmeters that will resolve a couple of hundred
picovolts, if you're careful.
Superconductive SQUID detectors can measure a picovolt.
Single-electron transistors can sense, well, single electrons.
John
On Mon, 01 Jun 2009 17:40:20 -0700, John Larkin
>Single-electron transistors can sense, well, single electrons.
>John
>John
PMTs can be good enough to detect single photon events.
On Jun 1, 10:33=A0pm, ItsASecretDummy
> On Mon, 01 Jun 2009 17:40:20 -0700, John Larkin
> >Single-electron transistors can sense, well, single electrons.
> >John
> >John
> =A0 PMTs can be good enough to detect single photon events.
Hmmm... I have a $35 digital multimeter that can measure exactly 0
volts!
Rick
rickman wrote:
>
> On Jun 1, 10:33 pm, ItsASecretDummy
> On Jun 1, 10:33 pm, ItsASecretDummy
> > On Mon, 01 Jun 2009 17:40:20 -0700, John Larkin
> > >Single-electron transistors can sense, well, single electrons.
> > >John
> > >John
> > PMTs can be good enough to detect single photon events.
>
> Hmmm... I have a $35 digital multimeter that can measure exactly 0
> volts!
> Hmmm... I have a $35 digital multimeter that can measure exactly 0
> volts!
No, it can't. It can display zero, even with some voltage at the
input. The issues is the resolution of the meter. Even with the probes
shorted, you will have some Johnson noise which is generated by the
resistors in the input circuitry, if the meter is above absolute zero
degrees. That voltage is too low to be displayed, but it is still there.
--
You can't have a sense of humor, if you have no sense!
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>What is the smallest physically-possible voltage that can be detected
>or processed given the state of today's technology?
>Thanks