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Noise, vibration, and harshness (NVH), also known as noise and vibration (N&V), is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks. While noise and vibration can be readily measured, harshness is a subjective quality, and is measured either via jury evaluations, or with analytical ...
Group the cables involved in the ground loop into a bundle or snake. [3] The ground loop still exists, but the two sides of the loop are close together, so stray magnetic fields induce equal currents in both sides, which cancel out. Break in the shield Create a break in the signal cable shield conductor. [5] The break should be at the load end.
A grounded Faraday shield between the primary and the secondary greatly reduces the coupling of common-mode noise. This may be another winding or a metal strip surrounding a winding. Differential noise can magnetically couple from the primary to the secondary of an isolation transformer, and must be filtered out if a problem occurs.
Large relays can switch very high currents, but they are limited in speed and reliability by their mechanical nature. One increasingly common application is in EVSE (Electric Vehicle Supply Equipment) where a high-power relay energizes the supply cable only when it is securely connected to the vehicle and both ends are ready to transfer power.
Five basic isolation test configurations exist: [3] Single Un-referenced End-Circuit – isolation between one input signal and circuit chassis/common ground. Multiple Un-referenced End-Circuits with a single return – isolation between several input signals and circuit chassis/common ground.
A six-DOF NSM isolator typically uses three isolators stacked in series: a tilt-motion isolator on top of a horizontal-motion isolator on top of a vertical-motion isolator. Figure 3 (Ref. needed) shows a schematic of a vibration isolation system consisting of a weighted platform supported by a single six-DOF isolator incorporating the isolators ...
The primary reason for the use of isolated grounds (IG) is to provide a noise-free ground return, separate from the equipment grounding (EG) return. The EG circuit includes all of the metal conduit, outlet boxes, and metal enclosures that contain the wiring and must be grounded to provide a safe return path in case of fault currents.
An example showing mains-powered electronic instruments with a floating ground. (Demonstrates three of the typical reasons for a floating ground.) Fourthly, a floating ground can help eliminate ground loops, [3] which reduces the noise coupled to the system. The image on the right shows an example of such a configuration.