Hello People
I have a question. How do I measure 4-20ma signal on 3 wire transmitter more precisely where do I connect my milliamp lead & common lead from the multimeter to the transmitter to measure milliamp signal. Thanks

 

The voltage you measure at the transmitter output will depend on the "burden" resistor on the receiver input - the value of which you don't know - plus the cable resistance.
If the transmitter is disconnected you will read 24V.
So, if you read 24V you know that the transmitter is disconnected, and if you measure less than that the circuit is complete.`
More than that is not possible to tell without connecting a current meter into the loop.

 

If you want to measure a 4-20mA transmitter current, you should unscrew the cable core and put an ammeter/DVM into the circuit. It means, you should to cut the circuit first, and , in turn, the production process may stop unexpectedly, or an alarm be activated, etc.
Much better to use a special DC clamp and simply clamp a wire carrying 4-20mA:

e-ma-m730.pdf (multiindia.co.in)

 

hi R1983,
Check out this link.
E
https://instrumentationtools.com/4-20-ma-transmitter-wiring/

 

Do you have a link to your sensor? A little more information would go a long way in getting some good advice. Normally on a 4 to 20 mA loop we can either measure the current or we place for example a 250 ohm resistor which yields 1 to 5 volts across the resistor or a 500 ohm resistor yielding 2 to 10 volts. These are the "burden" resistors mentioned above by IanO.

Ron

 

This is a very informative page, maybe suitable for what you want.