[Encyclios]

Background noise and interference

When making measurements, the display may show instabilities that cannot be attributed to real variations in the measurand. This problem is typical of electronic instrumentation, especially when working in very low voltage ranges (< 1 mV) or when very high resolutions (< 0.1 of full scale) are required from an instrument. In these conditions the indicators may read background noise from their own electronics or noise from an external source.

If these noises cannot be shielded or filtered out, the instability found on the reading constitutes a limit to the resolution of the measurement; in this case the resolution of the reading is defined as equal to the amplitude of the oscillation observed.