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Anonymous Poster #1

1-5VDC Signal

02/05/2012 9:46 PM

how to measure signal1-5vdc from smart transmitter?
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SolarEagle
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#1

Re: 1-5VDC Signal

02/05/2012 10:42 PM

Smart receiver?

http://control.com/thread/1229634509

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Tornado
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#2

Re: 1-5VDC Signal

02/06/2012 1:44 AM

Or voltmeter.

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resh_cop11
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#3
In reply to #2

Re: 1-5VDC Signal

02/06/2012 2:59 AM

smart device
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PWSlack
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#4
In reply to #3

Re: 1-5VDC Signal

02/06/2012 3:59 AM

Even a stupid one would do.

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resh_cop11
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#5
In reply to #4

Re: 1-5VDC Signal

02/06/2012 4:43 AM

Now power supply 24vdc to activate our transmitter.. Receive from our card 4 to 20mA.. We can measure in series with ammeter.. But how we measure 1 to 5volts signal?
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PWSlack
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#6
In reply to #5

Re: 1-5VDC Signal

02/06/2012 8:40 AM

Simple. Measure that voltage across 250Ω in the current loop.

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resh_cop11
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#8
In reply to #6

Re: 1-5VDC Signal

02/07/2012 6:36 AM

how to check current loop.. because if measure voltage meanz v get 24vdc.. 1-5 cannot measure.?
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PWSlack
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#9
In reply to #8

Re: 1-5VDC Signal

02/07/2012 10:10 AM

http://www.pacontrol.com/download/4-20mA-Current-Loop-Primer.pdf

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wrenchpuller
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#7

Re: 1-5VDC Signal

02/06/2012 9:20 PM

Hi,

Check voltage across the 250 ohm resistor as suggested by PWSlack. If you want to do the calculations simply use Ohms Law

E= I X R 4mA= 1 Volt

E= 0.004X250

E= 1

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khalidar2
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#10

Re: 1-5VDC Signal

02/13/2012 4:46 AM

By adding 250ohm across the signal
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khalidar2 (1); PWSlack (3); resh_cop11 (3); SolarEagle (1); Tornado (1); wrenchpuller (1)

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