Re: [time-nuts] Multiple Voltage monitoring

[WB6BNQ]

Hi Matt,

1.Is the voltage AC or DC ?
2.What is the voltage range ?
3.What kind of resolution ?

BillWB6BNQ

Matt Ettus wrote:

> Does anyone have a good solution for monitoring 4-8 different voltages
> at the same time?  I only need a sample rate around 1-2 Hz, but would
> need GPIB, serial, or ethernet support with protocol documentation.
>
> Any help identifying a solution other than 8 voltmeters would be much
> appreciated.
>
> Thanks,
> Matt


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Re: [time-nuts] Multiple Voltage monitoring

[Matt Ettus]

DC, 0 to 6V, 10mV or better resolution.

Thanks,
Matt

On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQ wrote:
> Hi Matt,
>
> 1.    Is the voltage AC or DC ?
> 2.    What is the voltage range ?
> 3.    What kind of resolution ?
>
> BillWB6BNQ
>
> Matt Ettus wrote:
>
>> Does anyone have a good solution for monitoring 4-8 different voltages
>> at the same time?  I only need a sample rate around 1-2 Hz, but would
>> need GPIB, serial, or ethernet support with protocol documentation.
>>
>> Any help identifying a solution other than 8 voltmeters would be much
>> appreciated.
>>
>> Thanks,
>> Matt
>
>
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Re: [time-nuts] Multiple Voltage monitoring

[John Miles]

National Instruments has been getting aggressive with their pricing lately:
e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 .  I was actually toying
with the idea of getting into the DAQ business a few months ago, but I
changed my mind in a hurry when I saw their ads.

-- john, KE5FX

> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
> Behalf Of Matt Ettus
> Sent: Thursday, July 30, 2009 9:19 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Multiple Voltage monitoring
>
>
> DC, 0 to 6V, 10mV or better resolution.
>
> Thanks,
> Matt
>
> On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQ wrote:
> > Hi Matt,
> >
> > 1.    Is the voltage AC or DC ?
> > 2.    What is the voltage range ?
> > 3.    What kind of resolution ?
> >
> > BillWB6BNQ
> >
> > Matt Ettus wrote:
> >
> >> Does anyone have a good solution for monitoring 4-8 different voltages
> >> at the same time?  I only need a sample rate around 1-2 Hz, but would
> >> need GPIB, serial, or ethernet support with protocol documentation.
> >>
> >> Any help identifying a solution other than 8 voltmeters would be much
> >> appreciated.
> >>
> >> Thanks,
> >> Matt
> >
> >
> > ___
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> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
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Re: [time-nuts] Multiple Voltage monitoring

[Matt Ettus]

I've actually got some of their ethernet devices.  The problem is that
the drivers are all closed.  They give no info on how to talk to them
without LabView.

Matt


On Thu, Jul 30, 2009 at 9:34 PM, John Miles wrote:
> National Instruments has been getting aggressive with their pricing lately:
> e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 .  I was actually toying
> with the idea of getting into the DAQ business a few months ago, but I
> changed my mind in a hurry when I saw their ads.
>
> -- john, KE5FX
>
>> -Original Message-
>> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
>> Behalf Of Matt Ettus
>> Sent: Thursday, July 30, 2009 9:19 PM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Multiple Voltage monitoring
>>
>>
>> DC, 0 to 6V, 10mV or better resolution.
>>
>> Thanks,
>> Matt
>>
>> On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQ wrote:
>> > Hi Matt,
>> >
>> > 1.    Is the voltage AC or DC ?
>> > 2.    What is the voltage range ?
>> > 3.    What kind of resolution ?
>> >
>> > BillWB6BNQ
>> >
>> > Matt Ettus wrote:
>> >
>> >> Does anyone have a good solution for monitoring 4-8 different voltages
>> >> at the same time?  I only need a sample rate around 1-2 Hz, but would
>> >> need GPIB, serial, or ethernet support with protocol documentation.
>> >>
>> >> Any help identifying a solution other than 8 voltmeters would be much
>> >> appreciated.
>> >>
>> >> Thanks,
>> >> Matt
>> >
>> >
>> > ___
>> > time-nuts mailing list -- time-nuts@febo.com
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>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> > and follow the instructions there.
>> >
>>
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>
>
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Re: [time-nuts] Multiple Voltage monitoring

[Flemming Larsen]

A good application for the Sanguino board?
 
  www.sanguino.cc
 
-- FL
 


>>
>> DC, 0 to 6V, 10mV or better resolution.
>>
>> Thanks,
>> Matt
>>
>>


  Trænger du til at se det store billede? Kelkoo giver dig gode tilbud på 
LCD TV! Se her http://dk.yahoo.com/r/pat/lcd
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Re: [time-nuts] Multiple Voltage monitoring

[John Miles]

Ah.  Well, I guess that's the catch, then. :(

Unless they actively encrypt the data, I'd guess that a few minutes with a
variable power supply and a copy of Wireshark would open the proverbial
kimono.

Failing that, how about a bank of V-to-F converter chips with paralleled
outputs, driving a line-in jack which is then FFT'ed to recover the
'channel' amplitudes?  Cost would be a buck or two per input at most, plus a
few hours' soldering and hacking time.

(Or an Atmel chip with an RS-232 hookup, as F. Larsen's post suggested just
before I hit 'send' on this one.  That'd be the easy way out, I think.)

-- john, KE5FX


> I've actually got some of their ethernet devices.  The problem is that
> the drivers are all closed.  They give no info on how to talk to them
> without LabView.
>
> Matt
>
>
> On Thu, Jul 30, 2009 at 9:34 PM, John Miles wrote:
> > National Instruments has been getting aggressive with their
> pricing lately:
> > e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 .  I was
> actually toying
> > with the idea of getting into the DAQ business a few months ago, but I
> > changed my mind in a hurry when I saw their ads.
> >
> > -- john, KE5FX
> >
> >> -Original Message-
> >> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
> >> Behalf Of Matt Ettus
> >> Sent: Thursday, July 30, 2009 9:19 PM
> >> To: Discussion of precise time and frequency measurement
> >> Subject: Re: [time-nuts] Multiple Voltage monitoring
> >>
> >>
> >> DC, 0 to 6V, 10mV or better resolution.
> >>
> >> Thanks,
> >> Matt
> >>
> >> On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQ wrote:
> >> > Hi Matt,
> >> >
> >> > 1.    Is the voltage AC or DC ?
> >> > 2.    What is the voltage range ?
> >> > 3.    What kind of resolution ?
> >> >
> >> > BillWB6BNQ
> >> >
> >> > Matt Ettus wrote:
> >> >
> >> >> Does anyone have a good solution for monitoring 4-8
> different voltages
> >> >> at the same time?  I only need a sample rate around 1-2 Hz,
> but would
> >> >> need GPIB, serial, or ethernet support with protocol documentation.
> >> >>
> >> >> Any help identifying a solution other than 8 voltmeters
> would be much
> >> >> appreciated.
> >> >>
> >> >> Thanks,
> >> >> Matt
> >> >
> >> >
> >> > ___
> >> > time-nuts mailing list -- time-nuts@febo.com
> >> > To unsubscribe, go to
> >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> > and follow the instructions there.
> >> >
> >>
> >> ___
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> >> and follow the instructions there.
> >>
> >
> >
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Re: [time-nuts] Multiple Voltage monitoring

[WB6BNQ]

Hi John and Mat,

The USB analog units seemed OK for the price ($169) and feature set.  Another 
one
to consider is http://www.dataq.com I tried one of their $25 starters that had 
10
bit resolution.

 I was going to suggest, depending upon Matts interests, that perhaps he could
use a PIC or ATMEL device with analog inputs and roll his own.  Most PIC models
have 10 bits but some do have 12 bit.  You could use an external A/D for 12 bits
or more.

There are some decent low-end HP DVMs on ebay occasionally, if you want to take 
a
chance on it working.  That would be the cheapest way to get the GPIB.

If time is short and you do not have the essentials for rolling you own then it
looks like John's suggestion would be the more reasonable route.  There are
others that provide some low-end data acquisition products as well.  You will
have to do a Google search for data acquisition.

Another idea is using some of the inexpensive 4 digit DVMs (run around $50 to
$80) that have serial output capability.  I bought a couple of Mastech units for
$59 a few years ago. They had a temperature probe and the serial output.

BillWB6BNQ

John Miles wrote:

> National Instruments has been getting aggressive with their pricing lately:
> e.g., http://zone.ni.com/devzone/cda/tut/p/id/8675 .  I was actually toying
> with the idea of getting into the DAQ business a few months ago, but I
> changed my mind in a hurry when I saw their ads.
>
> -- john, KE5FX
>
> > -Original Message-
> > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
> > Behalf Of Matt Ettus
> > Sent: Thursday, July 30, 2009 9:19 PM
> > To: Discussion of precise time and frequency measurement
> > Subject: Re: [time-nuts] Multiple Voltage monitoring
> >
> >
> > DC, 0 to 6V, 10mV or better resolution.
> >
> > Thanks,
> > Matt
> >
> > On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQ wrote:
> > > Hi Matt,
> > >
> > > 1.Is the voltage AC or DC ?
> > > 2.What is the voltage range ?
> > > 3.What kind of resolution ?
> > >
> > > BillWB6BNQ
> > >
> > > Matt Ettus wrote:
> > >
> > >> Does anyone have a good solution for monitoring 4-8 different voltages
> > >> at the same time?  I only need a sample rate around 1-2 Hz, but would
> > >> need GPIB, serial, or ethernet support with protocol documentation.
> > >>
> > >> Any help identifying a solution other than 8 voltmeters would be much
> > >> appreciated.
> > >>
> > >> Thanks,
> > >> Matt
> > >
> > >
> > > ___
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> > > To unsubscribe, go to
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > > and follow the instructions there.
> > >
> >
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> >
>
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Re: [time-nuts] Multiple Voltage monitoring

[Tom Van Baak]

Does anyone have a good solution for monitoring 4-8 different voltages
at the same time?  I only need a sample rate around 1-2 Hz, but would
need GPIB, serial, or ethernet support with protocol documentation.

Any help identifying a solution other than 8 voltmeters would be much
appreciated.

Thanks,
Matt


Check out http://www.labjack.com

/tvb


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Re: [time-nuts] Multiple Voltage monitoring

[Christian Vogel]

Hi Bill,

I was going to suggest, depending upon Matts interests, that perhaps  
he could use a PIC or ATMEL device with analog inputs and roll his  
own.

Most PIC models have 10 bits but some do have 12 bit.  You could use
an external A/D for 12 bits or more.


I actually used this for a laboratory setup just recently, but I only  
needed about 1% of accuracy. I bought a "Arduino Duemilanove" board  
for *?25*. This includes a FDTI USB-to-serial and a Atmel AVR  
microcontroller and is powered from USB. Their simple IDE speaks a  
preprocessed version of C and it took me 5 minutes to have my  
3-channel-analog-to-serial software done. You can also use your  
conventional toolchain and just ignore their beginners' environment,  
though.


http://arduino.cc/en/Main/ArduinoBoardDuemilanove

Chris




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Re: [time-nuts] Multiple Voltage monitoring

[Hal Murray]

> Does anyone have a good solution for monitoring 4-8 different voltages
> at the same time?  I only need a sample rate around 1-2 Hz, but would
> need GPIB, serial, or ethernet support with protocol documentation.

Which end of the $$$ scale are you interested in?  Are you willing to spend 
cash to save time, or do you prefer to invest time (hacking) to save $?

> DC, 0 to 6V, 10mV or better resolution.

10 mV out of 10 V is 10 bits.

Your 6V requirement is a bit ugly.  Be prepared to add an external divider.

You can get 10 or 12 bit A/Ds on single chip micros.  (Or could several years 
ago when I was last paying attention.)  So I expect somebody in that business 
makes something that will solve your problem without breaking the bank.

For example, Atmel's ATMega8a has 6 or 8 10 bit A/D channels.  (6 on DIP, 8 
on other packages.)  The data sheet says 15 k samples per second, but that's 
the marketing number.  I gave up before I found out how slow it is when you 
switch channels.  It's unlikely to have troubles with 1 or 2 Hz.

I expect Microchip/PIC has something similar.  Atmel may have something 
better, I didn't look very hard.  The Mega8 was just a sanity check.  (I'm 
biased, I've used it before.)


A/Ds (generally) fall into 2 categories.  I'll call them fast and slow.  The 
slow ones are linear in the number of counts rather than the number of bits, 
so they can be really slow when you get to 16-20 bits.  Think of the refresh 
rate on a typical DVM.  So you probably need to avoid those.  (unless your 
1-2 Hz is per single reading rather than getting a reading on each of the 4-8 
inputs)

The fast ones are linear in the number of bits.  (Then there are the 
super-fast, flash converers that are just 1 cycle and maybe a few pipeline 
delays.)




-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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Re: [time-nuts] Multiple Voltage monitoring

[WB6BNQ]

Hi Chris,

That is an interesting item and the pricing is certainly on the inexpensive
side.  Sparkfun has it for $30.  Sure beats trying to make your own boards and
come up with the parts.

I have an old development system from "mikroElektronika" [ 
http://www.mikroe.com/
] for the PIC line.  They provide compilers in "C" "PASCAL" or BASIC" which
resolve to machine routines, but to be honest even though I have the BASIC
version, I never use it.  I tend to like the machine language level even though 
I
have not really warmed up to the PICs.

At any rate, I spend some time explaining to those on the company's forum that
the A/D is really more of a monitor then a real voltmeter.  The reason I say 
that
is you can never truly see zero volts, nor can you actually get to 5 volts at 
the
other end without some fancy hardware tricks.  The same goes for the ATMEL line.
Most of the time your not looking for the zero end of the scale so everything
works out ok.

Thanks for the link to that product.  It is certainly worthy of mention.

BillWB6BNQ

Christian Vogel wrote:

> Hi Bill,
>
> > I was going to suggest, depending upon Matts interests, that perhaps
> > he could use a PIC or ATMEL device with analog inputs and roll his
> > own.
> > Most PIC models have 10 bits but some do have 12 bit.  You could use
> > an external A/D for 12 bits or more.
>
> I actually used this for a laboratory setup just recently, but I only
> needed about 1% of accuracy. I bought a "Arduino Duemilanove" board
> for *?25*. This includes a FDTI USB-to-serial and a Atmel AVR
> microcontroller and is powered from USB. Their simple IDE speaks a
> preprocessed version of C and it took me 5 minutes to have my
> 3-channel-analog-to-serial software done. You can also use your
> conventional toolchain and just ignore their beginners' environment,
> though.
>
> http://arduino.cc/en/Main/ArduinoBoardDuemilanove
>
>  Chris
>
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Re: [time-nuts] Multiple Voltage monitoring

[Robert Atkinson]

Hi Matt,
I'd recommend the Pico Technolgy range for an external box. < 
http://www.picotech.com/multi-channel-daq.html > The 1213 would do your job 
with an resistive divider. The Pico stuff is well made, they still support 
products made years ago, good free applications, and an open interface 
protocol. If you'd prefer an internal PC card I can do you a good price in a 
Data Translation DT-322. 8 channels differential (16 single ended) of 16 bit 
ADC, 4 DAC's a couple of counter timers and some digital I/O all on a PCI card. 
Good driver support and free (basic) applications. 
Robert G8RPI.

--- On Fri, 31/7/09, Matt Ettus  wrote:

> From: Matt Ettus 
> Subject: [time-nuts] Multiple Voltage monitoring
> To: "Discussion of precise time and frequency measurement" 
> 
> Date: Friday, 31 July, 2009, 5:00 AM
> Does anyone have a good solution for
> monitoring 4-8 different voltages
> at the same time?  I only need a sample rate around
> 1-2 Hz, but would
> need GPIB, serial, or ethernet support with protocol
> documentation.
> 
> Any help identifying a solution other than 8 voltmeters
> would be much
> appreciated.
> 
> Thanks,
> Matt
> 
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> 


  

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Re: [time-nuts] Multiple Voltage monitoring

[Christophe Huygens]

Let me quickly plug
http://www.hw-group.com/products/sensors/Sens-UI_en.html

I have found these guys to be cheap and good, when I had
remote Temp monitoring needs.

They have other cool stuff too. Worth a look.

Xtof


Matt Ettus wrote:
> DC, 0 to 6V, 10mV or better resolution.
>
> Thanks,
> Matt
>
> On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQ wrote:
>   
>> Hi Matt,
>>
>> 1.Is the voltage AC or DC ?
>> 2.What is the voltage range ?
>> 3.What kind of resolution ?
>>
>> BillWB6BNQ
>>
>> Matt Ettus wrote:
>>
>> 
>>> Does anyone have a good solution for monitoring 4-8 different voltages
>>> at the same time?  I only need a sample rate around 1-2 Hz, but would
>>> need GPIB, serial, or ethernet support with protocol documentation.
>>>
>>> Any help identifying a solution other than 8 voltmeters would be much
>>> appreciated.
>>>
>>> Thanks,
>>> Matt
>>>   
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>
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Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

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Re: [time-nuts] Multiple Voltage monitoring

[Dave Baxter]

Very nice!

And at those prices, why bother to roll your own, unless you have some
truly unique need.

Thanks for the tip off.

Dave Baxter.


> -Original Message-
> 
> Message: 1
> Date: Thu, 30 Jul 2009 22:17:24 -0700
> From: "Tom Van Baak" 
> Subject: Re: [time-nuts] Multiple Voltage monitoring
> To: "Discussion of precise time and frequency measurement"
>   
> Message-ID: <4baeb8bffb0d4e628262e793ca20d...@pc52>
> Content-Type: text/plain; format=flowed; charset="Windows-1252";
>   reply-type=original
> 
.
.
.
> 
> Check out http://www.labjack.com
> 
> /tvb

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Re: [time-nuts] Multiple Voltage monitoring

[Yuri Ostry]

Hello,

Friday, July 31, 2009, 8:00:51, Matt Ettus wrote:

M> Does anyone have a good solution for monitoring 4-8 different voltages
M> at the same time?  I only need a sample rate around 1-2 Hz, but would
M> need GPIB, serial, or ethernet support with protocol documentation.

M> Any help identifying a solution other than 8 voltmeters would be much
M> appreciated.


There was already some suggestions about using microcontroller to
build your own device, it looks reasonable for me but will take some
time and effort.

There is another possible solution (not well known here, and not so
cheap, but may be useful if you need halvanic isolation and
calibration handled by device). Look at Beckhoff K-Bus I/O devices or
their Wago series 750 clones. You can build remote ADC with
ethernet connection combining BK9000 bus coupler, some analog 0-10V
input modules (there is choice of different resolutions, like KL3102
2-channel 16 bit modules, or KL3468 8-channel (single-ended) 0-10V 12-bit
analog input modules). You will need one KL9010 bus end terminal.





-- 
Best regards,
 Yuri  mailto:y...@ostry.ru



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Re: [time-nuts] Multiple Voltage monitoring

[Patrick]

I hardly ever respond to posts here, I am just too dumb but.

I have looked into this a bit. Why not look at used Astro-med products
on Ebay. This way you have the display and plotting built into your
solution. You could probably pick up something for under $300 that would
have 8 to 16 channels with plot. There are also 'Scopecorders' or
"Hi-corders' from Yokogawa and Hioki but it is really hard to find a
decent one on Ebay or Dovebid and the prices are insane but the
specifications sound impressive.
-Patrick



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Re: [time-nuts] Multiple Voltage monitoring

[Lux, James P (337C)]

The $25 widget from Dataq.  4 channels, 10 bits, serial port
http://www.dataq.com/products/startkit/di194rs.htm

They have others.

I've also used the Eval boards from Maxim or Nat Semi, but these day's they're 
usually USB.  Sometimes, the protocol isn't published, but is trivially reverse 
engineerable from the demo program and a line monitor (inevitably, they talk 
USB, but emulate a COM port on the PC) OR they'll tell you the protocol if you 
ask.


On 7/30/09 9:00 PM, "Matt Ettus"  wrote:

Does anyone have a good solution for monitoring 4-8 different voltages
at the same time?  I only need a sample rate around 1-2 Hz, but would
need GPIB, serial, or ethernet support with protocol documentation.

Any help identifying a solution other than 8 voltmeters would be much
appreciated.

Thanks,
Matt

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Re: [time-nuts] Multiple Voltage monitoring

[iov...@inwind.it]

I would add to this scenario the solution I've used for many years, 
the AD12 card shown at about mid page at:

http://www.micromed.it/Elettronica/schede.html

It is a 12 bit + sign, 8 single ended or 4 differential channels, 
AD converter with RS232 interface. Resolution is 1 mV, conversion
time 8.8 microsec. The only issue is that you will have to write your
programs yourself. Very low power consumption, good accuracy, it is still my
preferred "long-term" measuring device, even for single channel 
measurements. I can make about 2000 measurements per seconds on a 300 MHz
Centrino laptop running DOS. Easy to keep under UPS along with the laptop.
I've not tested this, but I think it could be powered, skipping the 
onboard 5V regulator, from a USB or mouse port of the laptop. It has its own
voltage reference onboard (doesn't rely on the 5V regulator).

Antonio I8IOV


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Re: [time-nuts] Multiple Voltage monitoring

[Tom Van Baak]

Matt,

Another RS232 DAQ that I've used often in the lab is
model 232SDA12 from B&B Electronics. See:




/tvb


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Re: [time-nuts] Multiple Voltage monitoring

[Matt Ettus]

On Thu, Jul 30, 2009 at 10:17 PM, Tom Van Baak wrote:
>> Does anyone have a good solution for monitoring 4-8 different voltages
>> at the same time?  I only need a sample rate around 1-2 Hz, but would
>> need GPIB, serial, or ethernet support with protocol documentation.
>>
>> Any help identifying a solution other than 8 voltmeters would be much
>> appreciated.
>>
>> Thanks,
>> Matt
>
> Check out http://www.labjack.com
>
> /tvb


Thanks to everyone for the great suggestions, and to Tom in particular
for the LabJack suggestion.  I hadn't heard of many of those
companies.  In the end, I decided to go with the LabJack UE9, which is
inexpensive, flexible, and has an ethernet interface.  LabJack seems
to be very supportive of open source, their protocols are all open,
and they even provide Linux, Mac, and Python drivers!

Also interesting, check out:

http://cloud.labjack.com

This is their data acquisition server service...  Very cool idea.

Matt

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Re: [time-nuts] Multiple Voltage monitoring (Matt Ettus)

[Marc Bury]

Hi Matt,

A Hewlet Packard 3421A (Data acquisition unit) with option 20 (10 channel 
multiplexer) and GPIB would fit your need withour emptying your wallet.


  
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Re: [time-nuts] Multiple Voltage monitoring (Matt Ettus)

[John Ackermann N8UR]

Marc Bury wrote:

Hi Matt,

A Hewlet Packard 3421A (Data acquisition unit) with option 20 (10 channel 
multiplexer) and GPIB would fit your need withour emptying your wallet.


I can vouch for the 3421A -- nice, inexpensive box that is low power and 
fairly painless to program.  There are other HP data aquisition/switch 
boxes, including one with a 5 1/2 digit DMM, but they are much bigger 
and more power hungry.


John

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Re: [time-nuts] Multiple Voltage monitoring (Matt Ettus)

[Dave M]

Date: Thu, 30 Jul 2009 21:00:51 -0700
From: Matt Ettus 
Subject: [time-nuts] Multiple Voltage monitoring
To: Discussion of precise time and frequency measurement

Does anyone have a good solution for monitoring 4-8 different voltages
at the same time?  I only need a sample rate around 1-2 Hz, but would
need GPIB, serial, or ethernet support with protocol documentation.

Any help identifying a solution other than 8 voltmeters would be much
appreciated.

Thanks,
Matt



I recommend the Labjack model U12 USB DAQ unit. 
http://www.labjack.com/labjack_u12.php?prodId=27.  It has eight 12-bit 
analog inputs with a +/- 10V range.   The programming interface is through 
an open API (provided, with good documentation and support).  Languages 
supported include Visual Basic, Power Basic, Visual C++, Delphi, Perl, Java, 
etc.  A good number of programming examples are provided on the Labjack web 
site.  An active forum is available as well.  $129 USD plus S&H.


Lots of digital I/O as well, if you need it for other functions.

Dave M
masondg44 at comcast dot net 



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Re: [time-nuts] Multiple Voltage monitoring (Matt Ettus)

[Pete Lancashire]

Be careful on buying scanners. The issue is not the scanner
but in the fact that they use plug in cards. Make sure you
get the type of interface card(s) you need. There are a lot
of HP/Agilent scanners out there minus all their cards.

Saying that you can anything from a 3421A to a rack size
scanners for less the $25. The 3421A's usually
go for a bit more since they are small.

If space and power is not an issue you can get
a 3497A with its integral DMM (option 001) and a input
MUX card (option 010) for at times less the $25 minus
shipping. The last three I got were free minus the 120
mile round trip. On the flip side I got about 2,000 ft
of double braided low noise Teflon insulated wire tossed
in.

The down size is they are big. The plus is you can get
many different I/O cards and use it for other projects.

-pete

> Marc Bury wrote:
>> Hi Matt,
>>
>> A Hewlet Packard 3421A (Data acquisition unit) with option 20 (10
>> channel multiplexer) and GPIB would fit your need withour emptying your
>> wallet.
>
> I can vouch for the 3421A -- nice, inexpensive box that is low power and
> fairly painless to program.  There are other HP data aquisition/switch
> boxes, including one with a 5 1/2 digit DMM, but they are much bigger
> and more power hungry.
>
> John
>
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