mmm i appreciate your logic answer, but kindly let me imagine another situation . u said that the transducer have high megaohms resistance , then what about putting a small resistor 10 ohm for example rather than the diode and try to put the ammeter across it ..in this case also i think the...
another question
if the diode putted in this way to measure the milliampere across it , then it will not measure the actual current in the current loop by the transmitter bcz the diode will drop 0.7 volt and the transmitter will have 24 - 0.7 = 23.3 v only across it and will not give the same...
i attached the pic again
mr Skogsgurra your answer look helpful but if diode is putted to measure milliamperes across it without interrupting the circuit , why then put 2 diodes ... i think one diode is enough...
dear all,
in the pic attached ,any one know what is the benefit of using 2 diodes back to back in front of the analog signal input 4-20 ma before connecting it to the analog card???
