AESwaveAnswer
Oct 01, 2018 - 06:56 AM
The advantage is that more sensors give you more locations to sample from shorting the amount of diagnostic time spent moving the accelerometer around and taking multiple test drives. This is not necessary for all NVH diagnostic but can be a huge time saver for the more difficult to diagnose problems.
As for which kit is best, is tough to answer. The standard kit will provide the most options with the least compromise in abilities and time spent. The advanced kit will save time but allowing you to test mutliple components or from multiple locations in a single test drive and being able to compare the data. The starter kit will give you a single 3-axis accelerometer or single microphone which provides basic function of the NVH tool
A kit with a single 3-axis sensor can only sample readings from one location at a time. This is fine for most vibrations that can be felt throughout the car and the accelerometer is placded on the seat rail, but there are cases where you may need to use the accelerometer in a different manner.
After identifying a potential engine mount vibraiton. checking engine mounts would require placing the accelerometer on the engine side of the mount, and then moving it to the frame side and trying to compare the differences wth a single accelerometer. With two accelerometers and two modules you could place one on each side of the mount and take measurements simultaneously. With four, you could perfom the test on two mounts at one time.
Extra transducers and modules can also be helpful when used for checking pops and creaks of the suspension and body. Placing several transducers or microphones in multiple locations is better than moving one between multiple test driver. Another common use for wheel bearing is to place a transducer at each suspected hub and then place a microphone on a 3rd channel in the cabin.
There is also an option to use one 3-axis transducer and an additional single axis module to create a 4-axis input. This helps in identifying the location of some vibrations or noises.
As for which kit is best, is tough to answer. The standard kit will provide the most options with the least compromise in abilities and time spent. The advanced kit will save time but allowing you to test mutliple components or from multiple locations in a single test drive and being able to compare the data. The starter kit will give you a single 3-axis accelerometer or single microphone which provides basic function of the NVH tool
A kit with a single 3-axis sensor can only sample readings from one location at a time. This is fine for most vibrations that can be felt throughout the car and the accelerometer is placded on the seat rail, but there are cases where you may need to use the accelerometer in a different manner.
After identifying a potential engine mount vibraiton. checking engine mounts would require placing the accelerometer on the engine side of the mount, and then moving it to the frame side and trying to compare the differences wth a single accelerometer. With two accelerometers and two modules you could place one on each side of the mount and take measurements simultaneously. With four, you could perfom the test on two mounts at one time.
Extra transducers and modules can also be helpful when used for checking pops and creaks of the suspension and body. Placing several transducers or microphones in multiple locations is better than moving one between multiple test driver. Another common use for wheel bearing is to place a transducer at each suspected hub and then place a microphone on a 3rd channel in the cabin.
There is also an option to use one 3-axis transducer and an additional single axis module to create a 4-axis input. This helps in identifying the location of some vibrations or noises.
Source: SA
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