Re: [volt-nuts] MicroVolt meter
From: shalimr9@gmail.com
Subject: Re: [volt-nuts] MicroVolt meter
There are 24 bits ADCs available. One I have used is the MSC1210 from
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@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
The MSC1210 kits are no longer available.
Silabs has a similar part (8051 CPU with 24 bit ADC), the C8051F350.
They have a complete development kit for $99. You get a lot of stuff for $99.
The kit comes with a crippled Keil compiler (or a link to download it from the Keil web site) but the Silabs IDE supports the SDCC compiler, which is very good and free.
If you want to save as much as possible, you can buy just the C8051F350 development board ($50), a toolstick base adapter ($18 I believe) and a toolstick programming adapter or debug adapter ($10), and download the IDE from the Silabs web site.
The programming adapters are common to the entire range of Silabs parts.
I have a wiki page on the Silabs parts and tools:
http://www.ko4bb.com/dokuwiki/doku.php
Scroll down to Micro Controllers
There are many other CPU+24b ADC parts, but these are those I know.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: "Dave M" dgminala@mediacombb.net
Sender: volt-nuts-bounces@febo.com
Date: Wed, 4 May 2011 09:55:12
To: volt-nuts@febo.com
Reply-To: Discussion of precise voltage measurement volt-nuts@febo.com
Subject: Re: [volt-nuts] MicroVolt meter
From: shalimr9@gmail.com
Subject: Re: [volt-nuts] MicroVolt meter
There are 24 bits ADCs available. One I have used is the MSC1210 from
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@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
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
Another part worth looking at is the Analog Device ADUC7061.
It is an ARM-7 core with 24 bit ADC and a lot of other goodies. They have a $35 eval kit (look for ADUC7061 minikit). Programming is via the USB so there is no need for a separate programmer.
I believe gcc will create ARM-7 code, so you should not have to use the expensive Keil or IAR tools, at least once you become familiar with the architecture. Debugging under gcc/gdb is certainly not as much fun as it is under Keil or IAR (if it were ever fun.)
If your needs are modest, you may be able to do what you need with the sample code and eval software they provide with the kit.
That would be the cheapest 24 bit to USB converter you can buy.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: "Dave M" dgminala@mediacombb.net
Sender: volt-nuts-bounces@febo.com
Date: Wed, 4 May 2011 09:55:12
To: volt-nuts@febo.com
Reply-To: Discussion of precise voltage measurement volt-nuts@febo.com
Subject: Re: [volt-nuts] MicroVolt meter
From: shalimr9@gmail.com
Subject: Re: [volt-nuts] MicroVolt meter
There are 24 bits ADCs available. One I have used is the MSC1210 from
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@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
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
I picked up am msc1210 eval kit that I picked up for a project that never got off the ground. It's free for the price of shipping.
Email me off list if interested. Fred has first dibs, but if not it's first come first serve.
-Eric
Sent from my Banana jr (tm) Mobile Device
On May 4, 2011, at 8:25 AM, shalimr9@gmail.com wrote:
The MSC1210 kits are no longer available.
Silabs has a similar part (8051 CPU with 24 bit ADC), the C8051F350.
They have a complete development kit for $99. You get a lot of stuff for $99.
The kit comes with a crippled Keil compiler (or a link to download it from the Keil web site) but the Silabs IDE supports the SDCC compiler, which is very good and free.
If you want to save as much as possible, you can buy just the C8051F350 development board ($50), a toolstick base adapter ($18 I believe) and a toolstick programming adapter or debug adapter ($10), and download the IDE from the Silabs web site.
The programming adapters are common to the entire range of Silabs parts.
I have a wiki page on the Silabs parts and tools:
http://www.ko4bb.com/dokuwiki/doku.php
Scroll down to Micro Controllers
There are many other CPU+24b ADC parts, but these are those I know.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: "Dave M" dgminala@mediacombb.net
Sender: volt-nuts-bounces@febo.com
Date: Wed, 4 May 2011 09:55:12
To: volt-nuts@febo.com
Reply-To: Discussion of precise voltage measurement volt-nuts@febo.com
Subject: Re: [volt-nuts] MicroVolt meter
From: shalimr9@gmail.com
Subject: Re: [volt-nuts] MicroVolt meter
There are 24 bits ADCs available. One I have used is the MSC1210 from
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@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
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
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@mediacombb.net wrote:
From: shalimr9@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@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
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
discontinued
On Thu, May 5, 2011 at 8:13 AM, Pete Lancashire pete@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@mediacombb.net wrote:
From: shalimr9@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@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
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
TI do that,
They are nearly as bad as Maxim. A lot of makers have used lead free as an excuse to drop older parts.
--- On Thu, 5/5/11, Pete Lancashire pete@petelancashire.com wrote:
From: Pete Lancashire pete@petelancashire.com
Subject: Re: [volt-nuts] MicroVolt meter
To: "Discussion of precise voltage measurement" volt-nuts@febo.com
Date: Thursday, 5 May, 2011, 16:22
discontinued
On Thu, May 5, 2011 at 8:13 AM, Pete Lancashire pete@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@mediacombb.net wrote:
From: shalimr9@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@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
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.