Ruído, vibração e aspereza

501-25-93 Body Repairs - General Information 501-25-93 DESCRIPTION AND OPERATION E122758 NOTE: Before using the NVH tester in the service, the service technician should take part in an NVH training course to ensure effective use of this device during the road test. A description of the function and application of the NVH tester is enclosed with the device. The measuring device described below is used for diagnosis of the solid-borne sound and solid-borne sound transmission paths. The device is particularly suitable for medium and high frequency noise analyses. It principally enables noise diagnosis in the area of solid-borne sound and helps to identify solid-borne sound transmission routes. In order to obtain a positive diagnosis of droning problems (low frequency noises) and their sources, you must have sufficient experience of how to use this measuring device. The device works according to the following operating principle: Accelerometers (transmitters) are fitted on various vehicle components or body areas. The signals recorded here can be listened to one after the other on headphones or speakers via the different channels. Simultaneous illustration of several or all measuring channels (for comparison) is only possible visually on the display of the measuring device. Layout and operation: ‡ The test device has six different channels for noise diagnosis. ‡ Each channel is marked in color on the terminal, cable and test device. ‡ The solid-borne sound recorded is transmitted to the test device or the headphones by the magnetic accelerometers (transmitters). ‡ There is an amplifier on the test device with which the signal strength and the corresponding channel can be set. ‡ Only the noises from a transmitter are transferred to the headphones. ‡ All connected cables can be visually illustrated individually or simultaneously on the display. ‡ The test device saves the recorded data. ‡ The recorded data can be imported to a PC and evaluated. The NVH tester is equipped in addition with mobile magnetic sensors which are particularly suitable for the following noise tests: ‡ Internal noises at the dashboard ‡ Engine noise ‡ Electrical noises (sparking/voltage transmissions) ‡ Wind noises ‡ Vacuum - leaks Chassis noise tester (chassis ear) E122759 Used to diagnose solid-borne sound and its transmission routes. The device is particularly suitable for medium and high frequency noise analysis and principally enables noise diagnosis in the area of solid-borne sound and helps to identify solid-borne sound transmission routes. In order to obtain a positive diagnosis of droning problems (low frequency noises) and their sources, you must have sufficient experience of how to use this measuring device. Layout and operation: