Hi Roberto,
An industrial standard for converting 4-20mA is to use a precision 250 ohm
resistor in series with the circuit. This provides a 1-5VDC voltage drop
across the resistor which is proportional to 4-20mA. 250 ohm resistors are
expensive so I generally use 4 x 1k resistors in parallel.
The industry uses a 4-20mA signal as it can typically be transmitted >2 klm
over a twisted pair cable and is not influenced by the resistance of the
signal wire.
Regards
Rob
Australia
From: Roberto Spadim [mailto:[email protected]]
Sent: Wednesday, 19 October 2011 1:47 PM
To: OWFS (One-wire file system) discussion and help
Subject: Re: [Owfs-developers] industrial values
ok paul, i will check some devices too, maxim have samples for it :D hehehe
2011/10/18 Paul Alfille <[email protected]>
Look at http://owfs.org/index.php?page=voltage-measurement -- a table of the
voltage ranges for the different 1-wire slaves.
Current you read as voltage across a known (low) resistor.
On Tue, Oct 18, 2011 at 4:17 PM, Roberto Spadim <[email protected]>
wrote:
hi guys, another question....
how could i read industrial values?
0-20mA
4-20mA
0-10V
1-10V
--
Roberto Spadim
Spadim Technology / SPAEmpresarial
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definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
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Roberto Spadim
Spadim Technology / SPAEmpresarial
------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
_______________________________________________
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