- Mon Jan 20, 2014 8:04 pm
#167458
sorry i didn't make myself clear.Previously i was using current transformer having a resistor parallel connected. The current is supplied from a 230/12v transformer (not the current transformer) and the output of the transformer is going through the current transformer's hole to measure the current.
Currently i am using function generator replacing the current transformer for testing purpose. I directly supply voltage from the function gen to the input connecting the 1.5kohms. the circuit im using is still this: https://forum.sparkfun.com/viewtopic.ph ... 15#p129154.
when the function gen supply 1vpp the output of the op amp is 3.10vdc. when its 5vpp the output is 3.97vdc.
The end product will be monitoring home appliance plugged into the socket outlet but the transmitter (4-20mA) required it to be dc voltage. I read online the best way to have 4-20mA is to have 1-5vdc and using a 250ohms resistor.
Thank you!
Currently i am using function generator replacing the current transformer for testing purpose. I directly supply voltage from the function gen to the input connecting the 1.5kohms. the circuit im using is still this: https://forum.sparkfun.com/viewtopic.ph ... 15#p129154.
when the function gen supply 1vpp the output of the op amp is 3.10vdc. when its 5vpp the output is 3.97vdc.
The end product will be monitoring home appliance plugged into the socket outlet but the transmitter (4-20mA) required it to be dc voltage. I read online the best way to have 4-20mA is to have 1-5vdc and using a 250ohms resistor.
Thank you!