|NI-DCPower (English | Japanese)|
In many environments, line noise (for example, 50 Hz or 60 Hz) or other unwanted periodic signals may be present in a system and can degrade measurement quality. Measurements can be acquired over a period of time and averaged to reduce the effects of noise. Depending on your device, noise rejection can be achieved in different ways. For example, some devices have a user-programmable aperture time that helps reject noise intervals of the power line frequency in addition to providing a method to average multiple samples together for more filtering. Other devices allow averaging multiple samples together to reject periodic noise based on the number of samples averaged.