SEKURE SX-3100LCD Manuel de l'opérateur télécharger pdf (Page 217)

NVH 205

SPECIAL DIAGNOSTIC CONDITIONS

PREDICTED VIBRATION FREQUENCY IS OUT OF RANGE

If a calculated vibration frequency for the engine, driveline, or wheels is predicted to be

beyond the current frequency display range, the frequency range indicator in the upper

right corner of the display and the letters <hz> flash at a 1 hertz rate.

On the Barchart display, a flashing <hz> located below the component identifier indicates

which component is out of range.

For the 2-D and 3-D Spectral display modes the out of range condition can exist only for

the selected component. For the Barchart display, an out of range condition may exist for

any of the vibrational components.

OVERLAP CONDITION

If the calculated vibration frequencies for the engine, driveline, or wheels are predicted to

be in close proximity to one another, an overlap condition exists. If this occurs, the word

<OVERLAP> flashes on the lower right corner of the screen. The right LED flashes RED,

and the component identifier for the overlapped frequency also flashes.

For the Barchart display, an up arrow (↑) is shown under the component bars related to the

overlap condition.

VIBRATIONS RELATED TO CV JOINTS

In certain vehicles a vibrational frequency related to the CV joint is calculated and

identified on the driveline selection by a “ ^ ”. All other vibrational identifiers are the up

arrow (↑).

IDENTIFIERS DISPLAYED FOR EACH COMPONENT

Vibration and Noise related to the component calculated and identified are as follows:

a) Engine component

Engine frequency order ratios are related to driveline as follows:

Inline 4: 1st, 2nd revolution (firing frequency is 2nd)

Inline 6: 1st, 3rd revolution

V6: 1st, 2nd, 3rd revolution

V8: 1st, 4th revolution

b) Driveline component

Driveline frequency order ratios are related to drive type as follows:

CV joint is identified as (^)

FWD: Which has 3 ball type CV joint:wheel 3rd revolution

Which has 6 ball type CV joint:wheel 6th revolution

RWD: Propeller shaft 1st, 2nd revolution, Identifiers are (↑)

Which has 3 ball type CV joint:wheel 3rd revolution

Which has 6 ball type CV joint:wheel 6th revolution

c) Wheel component

Wheel frequency order ratios are as follows:

1st, 2nd, 3rd revolution

1 2 ... 212 213 214 215 216 217 218 219 220 221 222 ... 377 378

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SEKURE SX-3100LCD Manuel de l'opérateur Page 217