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Discussion of precise voltage measurement

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Voltage to frequency

JG
Joseph Gray
Mon, Jul 29, 2013 7:55 PM

I imagine that this has been discussed before, but I didn't see anything in
the archives. Long before my recent weakness and ordering of that voltage
standard on ebay, I had thought about using a voltage to frequency
converter.

Since it is relatively easy and inexpensive to have a very accurate
frequency standard at home, I wondered how difficult would it be to use
that standard to create an accurate voltage standard.

Some Googling didn't turn up much along these lines. Since this method
apparently isn't being used, there must be some reason. Can anyone
enlighten me?

Joe Gray
W5JG

I imagine that this has been discussed before, but I didn't see anything in the archives. Long before my recent weakness and ordering of that voltage standard on ebay, I had thought about using a voltage to frequency converter. Since it is relatively easy and inexpensive to have a very accurate frequency standard at home, I wondered how difficult would it be to use that standard to create an accurate voltage standard. Some Googling didn't turn up much along these lines. Since this method apparently isn't being used, there must be some reason. Can anyone enlighten me? Joe Gray W5JG
JG
Joseph Gray
Mon, Jul 29, 2013 8:29 PM

I found this app note that looks interesting.

http://www.stanford.edu/class/ee122/Parts_Info/datasheets/LM331-AN-C.pdf

Joe Gray
W5JG

On Mon, Jul 29, 2013 at 1:55 PM, Joseph Gray jgray@zianet.com wrote:

I imagine that this has been discussed before, but I didn't see anything
in the archives. Long before my recent weakness and ordering of that
voltage standard on ebay, I had thought about using a voltage to frequency
converter.

Since it is relatively easy and inexpensive to have a very accurate
frequency standard at home, I wondered how difficult would it be to use
that standard to create an accurate voltage standard.

Some Googling didn't turn up much along these lines. Since this method
apparently isn't being used, there must be some reason. Can anyone
enlighten me?

Joe Gray
W5JG

I found this app note that looks interesting. http://www.stanford.edu/class/ee122/Parts_Info/datasheets/LM331-AN-C.pdf Joe Gray W5JG On Mon, Jul 29, 2013 at 1:55 PM, Joseph Gray <jgray@zianet.com> wrote: > I imagine that this has been discussed before, but I didn't see anything > in the archives. Long before my recent weakness and ordering of that > voltage standard on ebay, I had thought about using a voltage to frequency > converter. > > Since it is relatively easy and inexpensive to have a very accurate > frequency standard at home, I wondered how difficult would it be to use > that standard to create an accurate voltage standard. > > Some Googling didn't turn up much along these lines. Since this method > apparently isn't being used, there must be some reason. Can anyone > enlighten me? > > Joe Gray > W5JG > >
BG
Brent Gordon
Mon, Jul 29, 2013 8:49 PM

You can find the data sheet at http://www.ti.com/product/lm331.

Their idea of precision is not in the same league as a Volt Nut or Time
Nut (Worst case values):
Non-linearity:  0.14%
Temperature Stability:  50 ppm/C
Supply Sensitivity:  0.1 %/V

Many years ago I used one of these for a project and I was disappointed
in the performance.  I no longer recall the details.

Brent

On 7/29/2013 2:29 PM, Joseph Gray wrote:

I found this app note that looks interesting.

http://www.stanford.edu/class/ee122/Parts_Info/datasheets/LM331-AN-C.pdf

Joe Gray
W5JG

On Mon, Jul 29, 2013 at 1:55 PM, Joseph Gray jgray@zianet.com wrote:

I imagine that this has been discussed before, but I didn't see anything
in the archives. Long before my recent weakness and ordering of that
voltage standard on ebay, I had thought about using a voltage to frequency
converter.

Since it is relatively easy and inexpensive to have a very accurate
frequency standard at home, I wondered how difficult would it be to use
that standard to create an accurate voltage standard.

Some Googling didn't turn up much along these lines. Since this method
apparently isn't being used, there must be some reason. Can anyone
enlighten me?

Joe Gray
W5JG

You can find the data sheet at <http://www.ti.com/product/lm331>. Their idea of precision is not in the same league as a Volt Nut or Time Nut (Worst case values): Non-linearity: 0.14% Temperature Stability: 50 ppm/C Supply Sensitivity: 0.1 %/V Many years ago I used one of these for a project and I was disappointed in the performance. I no longer recall the details. Brent On 7/29/2013 2:29 PM, Joseph Gray wrote: > I found this app note that looks interesting. > > http://www.stanford.edu/class/ee122/Parts_Info/datasheets/LM331-AN-C.pdf > > Joe Gray > W5JG > > > > On Mon, Jul 29, 2013 at 1:55 PM, Joseph Gray <jgray@zianet.com> wrote: > >> I imagine that this has been discussed before, but I didn't see anything >> in the archives. Long before my recent weakness and ordering of that >> voltage standard on ebay, I had thought about using a voltage to frequency >> converter. >> >> Since it is relatively easy and inexpensive to have a very accurate >> frequency standard at home, I wondered how difficult would it be to use >> that standard to create an accurate voltage standard. >> >> Some Googling didn't turn up much along these lines. Since this method >> apparently isn't being used, there must be some reason. Can anyone >> enlighten me? >> >> Joe Gray >> W5JG >> >>