I have a analog card 1715-IF16 with six 4-20ma instruments on it.
The card in a single-ended method. The instrument has been service for a while with no issue. One day lost signal and check the output voltage was 4 vdc and 0 ma. Disconnect the voltage goes to 20vdc. The transmitter reads fine when reading from a fluke MM with loop power. Tried another point and would read good for 3 minutes or so, than slowly drains voltage to 4 vdc. Tried a simulator and results the same. The card is remotely wired using a common ground. Must say the other 5 transmitters are reading o.k..
Any advice would be helpful
The card in a single-ended method. The instrument has been service for a while with no issue. One day lost signal and check the output voltage was 4 vdc and 0 ma. Disconnect the voltage goes to 20vdc. The transmitter reads fine when reading from a fluke MM with loop power. Tried another point and would read good for 3 minutes or so, than slowly drains voltage to 4 vdc. Tried a simulator and results the same. The card is remotely wired using a common ground. Must say the other 5 transmitters are reading o.k..
Any advice would be helpful