Vibrations introduced into an isolated system via cabling is a common problem. Cables can carry vibrations from a controller to the isolated system, or simply pick up vibrations and introduce them into the isolated system. These non-isolated cables short circuit the vibration isolation system. The most common technique is to some weights on the cables. Figure 1 show some cables weighted down by. In this example each steel bar weighs about 10 lbs. When possible, isolate cables on both sides of a controller of computer as shown in Fig. 2, 3. Placing weight on the controller or computer may also help reduce parasitic vibrations.

When placing the weights on the cables, consider the following:

1. Separate and arrange the cables so they do not touch each other.

2. Experiment with various weights to get the maximum noise reduction, without damaging the cable. Generally speaking, the harder the cable the more weight is required.

3. If possible, make sure the cable is loose and not stretched tightly from the controller to the isolated equipment.

4. The size of the cable should be considered.

1. Looping the cables, allowing them to swing freely can reduce the parasitic vibrations.

2. If looping does not help use weights on the cables.

1. Use weights.

2. Use weights with a damping material. Select a visco-elastic material that is capable of absorbing the frequencies of concern.