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'[EE]: Looking for 8-channel Data Logger'
2002\10\04@014947 by Thomas N

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Hi everyone,

I am looking for a high resolution, precision, 8-channel or 4-channel
data logger.  I use it mainly to measure battery voltages ranging from 0
to 5V.  I prefer the one that can be connected to RS232 and with Windows
software interface.  I would like to see the data plots in real-time.

If you know or have any data logger that fits the description above,
please let me know!

Regards,
Thomas

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2002\10\04@022926 by Wagner Lipnharski

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Thomas N wrote:
> Hi everyone,
>
> I am looking for a high resolution, precision, 8-channel or 4-channel
> data logger.  I use it mainly to measure battery voltages ranging
> from 0 to 5V.  I prefer the one that can be connected to RS232 and
> with Windows software interface.  I would like to see the data plots
> in real-time.
>
> If you know or have any data logger that fits the description above,
> please let me know!
>
> Regards,
> Thomas
>
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Okeeeey, high resolution, precision, that is vague.
Can you specify better what is the resolution and accuracy expected?
12, 16, 24 bits?

Resolution is the minimum degree of information change, while accuracy is
normaly specified in percentage of the reading, or percentage of the full
scale (span).

A resolution of 12 bits on a 5V battery measurement system, means 5 / 2^12
= 1.2mV, what automaticaly set the maximum accuracy of 0.0012 / 5 = 0.02%,
but accuracy also means how well the circuit reads the translates, this
will be something particular of each converter, but it will never be better
than 0.02% since it is limited by the resolution.  So, in most cases if the
circuit is super-dee-duper, you could say that accuracy (precision) will be
0.02% +- 1 digit (since the last digit will be flipping by lack of software
precision).

I wonder if measurement battery voltage for logging will ever reach the
necessity of 1.2mV of resolution, it seems that the internal battery ionic
movement will be more than that.


/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
Wagner Lipnharski - UST Research Inc
Orlando FLorida - USA - http://www.ustr.net
/_/_/_/ Atmel AVR Consultant /_/_/_/

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2002\10\04@025738 by Jinx

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> I am looking for a high resolution, precision, 8-channel or
> 4-channel data logger.  I use it mainly to measure battery
> voltages ranging from 0 to 5V.  I prefer the one that can
> be connected to RS232 and with Windows software interface.
> I would like to see the data plots in real-time.

Sounds like a job for an F877, or do you want > 10-bit ?

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2002\10\04@025750 by Thomas N

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Dear Wagner,

Thank you for your comments!  Yes, what I need is a 12-bit or 16-bit,
8-channel data logger that can take at least 1 sample per second for all
8 channels.

Any recommendation?

Regards,
Thomas


{Original Message removed}

2002\10\04@033928 by Russell McMahon

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> .... what I need is a 12-bit or 16-bit,
> 8-channel data logger that can take at least 1 sample per second for all
> 8 channels.


If you are happy to "roll your own" you might get this accuracy using Scott
Datallo's Sigma delta converter. This needs *any* PIC (with enough pins) and
typically one capacitor and several resistors per channel. Search archives
for "Sigma Delta".


       RM

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2002\10\04@084643 by Rick C.

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This is it!
http://www.dataq.com/194.htm
Rick

Thomas N wrote:

{Quote hidden}

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2002\10\04@093859 by Jinx

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Microchip have the MCP3208, 8 channel, 12-bit

www.microchip.com/download/lit/pline/analog/mixed/signal/adc/sar/2104
6b.pdf

Analog Devices have several

www.analog.com/technology/dataConverters/designTools/selectionGuides/
adc_lo_pwr.html

So do Burr-Brown / Texas

http://focus.ti.com/docs/analog/analoghomepage.jhtml

(click on Device Locator)

Have you tried actually Googling for "8 channel data logger" ? There's
page after page of results

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2002\10\04@131727 by Dwayne Reid

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At 10:14 PM 10/3/02 -0700, Thomas N wrote:
>Hi everyone,
>
>I am looking for a high resolution, precision, 8-channel or 4-channel
>data logger.  I use it mainly to measure battery voltages ranging from 0
>to 5V.  I prefer the one that can be connected to RS232 and with Windows
>software interface.  I would like to see the data plots in real-time.

Greg Reel of Deltaquest <http://www.deltaquest.com/> makes a real nice unit
called the IDVM.  It does (I think) 20 bit conversions at the rate of all 8
channels every 1.5 or 2 seconds.  I've had one for years and it works very
well.

Spend the extra few dollars and get the optional precision reference and
input divider network.  Also get the relay isolated inputs version - this
allows floating measurements on the first 4 input channels with up to 400V
separation.

dwayne

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Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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