Noise, Vibration and Harshness (NVH) — 2016 workshop reference 80

being displayed and its relative G-force. The keypad is arranged to make the Electronic Vibration Analyzer (EVA) simple to program and use. Some of the functions include the ability to average readings as well as record, play back and freeze readings. The Electronic Vibration Analyzer (EVA) has a strobe balancing function that can be used to detect imbalance on rotating components such as a driveshaft or engine accessories.

Noise, Vibration and Harshness (NVH) — original illustration 1, reference 80Original colors & callouts · Select to enlarge

Item	Description
1	Electronic Vibration Analyzer (EVA) screen
2	Frequency mode displayed in Revolutions Per Minute (RPM) or Hertz (Hz)
3	Active sensor input (A or B)
4	Current active mode
5	G-force indicators or the strongest frequencies in descending strength of each vibration
6	Strength of each vibration
7	Frequency in Revolutions Per Minute (RPM)/ Hertz (Hz) of each vibration

Record the readings taken with the diagnostic tool.

Frequencies should be read in the "average" mode. Frequencies have a range of plus or minus 2 Hertz (Hz). A reading of 10 Hertz (Hz) can be displayed as an 8 Hertz (Hz) through 12 Hertz (Hz).

Vibrate Software

Vibrate Software is a diagnostic aid which will assist in pinpointing the source of unacceptable vibrations. The engine's crankshaft is the point of reference for vibration diagnosis. Every rotating component will have an angular velocity that is faster, slower or the same as the engine's crankshaft. Vibrate Software® calculates the angular velocity of each component and graphically represents these velocities on a computer screen and on a printed vibration worksheet. The following steps outline how Vibrate Software® helps diagnose a vibration symptom:

Enter the vehicle information. Vibrate will do all the calculations and display a graph showing tire and driveline vibrations. Print a Vibration Worksheet graph. The printed graph is to be used during the road test. Road test the vehicle at the speed where the vibration is most noticeable. Record the vibration frequency Revolutions Per Minute (RPM) and the engine Revolutions Per Minute (RPM) on the worksheet graph. The point on the graph where the vibration frequency Revolutions Per Minute (RPM) reading and the engine Revolutions Per Minute (RPM) reading intersect indicates the specific component group causing the symptom.

A frequency measurement tool capable of measuring vibration frequency and Revolutions Per Minute (RPM) will be needed.

Provides graphics of diagnostic procedures to aid in testing components.

Reed Tachometer

Source reference 80

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.