kinarfi
Well-Known Member
I have a LEM HX 03..50-P/SP2 Current Transducer that has a 2.5 volt output, plus or minus .0125 v/amp, depending on which way the current is flowing and I'm trying to add a digital volt meter to it which show the amperage through the transducer to tell me the current out of my power supply, a 35 amp at 12 volt power supply out of a server rack.
Using a .0025 shunt resistor was easy, I just set my Op-amp for a gain of 400 using TLC2274CN rail to rail quad op-amp. My problem is how to compensate for the 2.5 offset voltage of the current transducer. I tried to float the input from the op-amp minus with 2.5volt using a TL451a, but I think that's not going work. Any advice?
![LEM.JPG LEM.JPG](https://www.electro-tech-online.com/data/attachments/98/98218-8063954e3da6cd0baf896ed2cda018a7.jpg)
Thanks,
Jeff
Using a .0025 shunt resistor was easy, I just set my Op-amp for a gain of 400 using TLC2274CN rail to rail quad op-amp. My problem is how to compensate for the 2.5 offset voltage of the current transducer. I tried to float the input from the op-amp minus with 2.5volt using a TL451a, but I think that's not going work. Any advice?
![LEM.JPG LEM.JPG](https://www.electro-tech-online.com/data/attachments/98/98218-8063954e3da6cd0baf896ed2cda018a7.jpg)
Thanks,
Jeff