E eng.majeed New Member Jul 12, 2009 #1 Hello.. can any one say me how we can convert 4-20 ma signal output into differntial output voltage, related to transmitters.
Hello.. can any one say me how we can convert 4-20 ma signal output into differntial output voltage, related to transmitters.
ericgibbs Well-Known Member Most Helpful Member Jul 12, 2009 #2 eng.majeed said: Hello.. can any one say me how we can convert 4-20 ma signal output into differntial output voltage, related to transmitters. Click to expand... hi, Use a 250R resistive load in series with the current loop. This will give a voltage across the 250R of 1V at 4mA and 5V at 20mA. OK.?
eng.majeed said: Hello.. can any one say me how we can convert 4-20 ma signal output into differntial output voltage, related to transmitters. Click to expand... hi, Use a 250R resistive load in series with the current loop. This will give a voltage across the 250R of 1V at 4mA and 5V at 20mA. OK.?
ericgibbs Well-Known Member Most Helpful Member Jul 12, 2009 #3 hi, This circuit will give a 0V to +/-5V differential output from a 4 to 20mA current loop. Use a pot with a Vref source to give the -1V offset voltage, in this circuit the OPA's are CA3140's. OK.? Attachments Diff_4to20b.gif 24 KB · Views: 178
hi, This circuit will give a 0V to +/-5V differential output from a 4 to 20mA current loop. Use a pot with a Vref source to give the -1V offset voltage, in this circuit the OPA's are CA3140's. OK.?