FR NOISE
Brush Noise
1. This information is provided to illustrate some of hte brush noise sources that may be exploited in the spirit of predictive maintenance.
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COPPER BRUSHES
2. Copper Brushes. There are 3 sub-types including sacrificial, dynamic and fallback brush.
3. One of the most commonly encountered copper brush is the Acme 7000, commonly first observed on oscillosope D124
Figure 1. Oscilloscope C
4. When seen on Oscilloscope C, copper brushes failure indicators appear as horizontally spaced lines that often increase and decrease.