Any equipment containing electronics there are "offenders" such as stepper and variable frequency motors, relays and solenoids and poorly-designed switched power supplies. There are also "victims" such as sensors and sensitive electronics circuits. This results in internally-generated noise that interferes with normal operation of equipment itself.
In order to alleviate this problem, OnFILTER offers specially-designed DC filters that provide significant attenuation of high-frequency internally-generated noise. Connect it at the supply input to your sensitive equipment sections to get the most noise reduction.