Low-cost closed-loop current sensor

Because motor debugging requires current observation, I initially wanted to build a Rogowski coil current probe following an online open-source tutorial. However, winding the Rogowski coil didn't go smoothly, so I switched to using a readily available closed-loop Hall effect sensor. The solution is relatively simple, just amplifying the signal through an instrumentation amplifier circuit. Currently, there's an AC attenuation issue; I tried to solve it, but it didn't help much, so I abandoned it.
I used a ±75A current sensor from TB (Taiwan), with a current range of 2.5±2V and a detection unit of DC~200kHz. The signal was amplified and converted to two levels, 200mV/A and 50mV/A, using an operational amplifier. It was connected to an oscilloscope via an SMA-J to BNC-J cable. The 5V power supply uses a Type-C interface, and the power supply and output power are isolated, effectively ensuring the oscilloscope's safety. Actual testing compared to a Tektronix TCP0150 revealed that the DC performance was basically the same, but there was attenuation above 10kHz in the AC. Testing under 10A 25kHz conditions showed attenuation of less than 1A, which is perfectly adequate for daily motor debugging. Total cost less than 100.
Current probe ±75A, note that the output range needs to be changed to 2.5±2: HCS-ES5 closed-loop Hall current sensor, high reliability and anti-interference - Taobao (taobao.com)
Housing: Aluminum alloy housing, split aluminum housing, battery box, circuit board PCB box, aluminum profile housing, custom opening 50*20 - Taobao (taobao.com)