There are 28 low RDS_ON MOSFETs built in the 400W module that allow users loading up to 80A in 0.4V. When 5 of the 400W modules are paralleled for operation, up to 400A is inside the chassis without the need of series connecting any bias power supply on the load internally or externally, so the noise measured was not affects by the bias power supply.
PS: All low voltage electrical specifications are measured by the Load terminal. It is suggested to use suitable Load Cable and twist pair the wiring to reduce the resistance and inductance.
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