Home-made rogowski coil

Part 1: Finish integrator and amplifier circuit We found that the theoretical voltage of the coil calculated last week was wrong. The radius should not be the radius of the copper wire, it should be the radius of the coils. We measured the diameter of the coil was 2.4mm, using the same calculation steps as last week and the theoretical voltage should be 3.75*10^(-6). First we finished building the integrator circuit and got the expected output waveform. We changed the circuit diagram we used before. The final circuit of integrator was: The input signal was a 120mV, 50kHz square wave and the output signal was a -1.3V, 1.667 MHz triangle wave. The output signal was amplified by about 10.83 times.    (Integrator circuit) Then we built the amplifier circuit. We designed the voltage gain of the amplifier circuit is 1000. According to: G=1+50k/Rg, we calculated Rg=505.05 ohm. However, the output signal was opposite with what we expected. The output voltage wa...

Part 1: Power Amplifier Circuit First we built power amplifier circuit. According to the instruction book, we knew we need to used two 1000 μF capacitors connected with power amplifier. Then we inserted a resistor to measure the output signal. According to the instruction book of power amplifier, it requires a symmetric DC power supply with an output range of 30 to 35V. In the experiment we provided a 30V DC power supply.  After testing the power amplifier circuit, we put current transducer into the circuit but the result was incorrect. We decided to finish this part in next week. Part 2: Theoretical voltage of coil We estimated the ratio of number of turns to length 1cm. The estimated result is 21 turns per centimeter, so N/L=2100 (turns per meter). Then we measured the coil diameter by electronic digital caliper is 2.4mm so r=1.2mm. In the experiment, the signal frequency we used was 50kHz. The calculation of coil theoretical voltage is following: ...