Toshiba recommends a 4-layer PCB with a solid ground plane and a separate power plane for the CT. The layout should also minimize the distance between the CT and the burden resistor to reduce noise and ensure accurate measurements.
The burden resistor value depends on the desired output voltage range and the CT's turns ratio. A general rule of thumb is to choose a burden resistor that results in an output voltage of 1-5V at the maximum expected current. Toshiba provides a selection guide in the datasheet or application notes.
The RN1904FE,LF has an operating temperature range of -40°C to 125°C. However, the accuracy and linearity of the CT may degrade at extreme temperatures. It's recommended to operate the CT within a temperature range of 0°C to 85°C for optimal performance.
To ensure accurate current measurements, ensure the CT is properly calibrated, the burden resistor is correctly selected, and the PCB layout is optimized. Additionally, consider using a low-pass filter to reduce noise and aliasing effects.
The RN1904FE,LF is designed for low-frequency current measurements up to 100 kHz. For high-frequency measurements, consider using a CT with a higher bandwidth, such as the RN1904FE,HF. However, the HF version may have reduced accuracy and linearity at low frequencies.
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RN1904FE,LF(CT Overview
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