Submitted by TrystanLea on Tue, 04/27/2010 - 17:20.
Hello Maarten and harisdmac
Good troubleshooting questions and suggestions harisdmac thanks for helping out! my first thoughts Maarten is are you clamping your CT around the whole cord, neutral+live?, as this would give you no AC output on the multimeter as the magnetic field from the neutral would combine with the live and cancel out. The live and neutral wires need to be seperated and CT clamped around live or neutral only.
All the seedstudio CT's produce AC outputs. SCT-013-000 is like the efergy sensor it does not have a sense resistor (burden resistor) built in and so for that CT a sense resistor needs to be added, to convert the proportional current output to a proportional voltage output. All the other CT's in the seedstudio range produce voltage outputs, these CT's have a sense resistor already build in and so there is no need to add one as in the circuit above.
Since your CT is the SCT-013-030 the output is a proportional voltage so try setting your multimeter to AC voltage, you should get about 0.290V rms with a 2000W load. Let me know if you have any luck
Hello Maarten and
Hello Maarten and harisdmac
Good troubleshooting questions and suggestions harisdmac thanks for helping out! my first thoughts Maarten is are you clamping your CT around the whole cord, neutral+live?, as this would give you no AC output on the multimeter as the magnetic field from the neutral would combine with the live and cancel out. The live and neutral wires need to be seperated and CT clamped around live or neutral only.
All the seedstudio CT's produce AC outputs. SCT-013-000 is like the efergy sensor it does not have a sense resistor (burden resistor) built in and so for that CT a sense resistor needs to be added, to convert the proportional current output to a proportional voltage output. All the other CT's in the seedstudio range produce voltage outputs, these CT's have a sense resistor already build in and so there is no need to add one as in the circuit above.
Since your CT is the SCT-013-030 the output is a proportional voltage so try setting your multimeter to AC voltage, you should get about 0.290V rms with a 2000W load. Let me know if you have any luck