
NVH 207
TWO-DIMENSIONAL (2-D) SPECTRAL DISPLAY MODE
2-D Spectral Display mode is the default mode entered when <VIBRATION> or
<NOISE> is selected from the <NVH MAIN MENU>.
Frequency bands of 62.5 hz, 125 hz, 250 hz, and 500 hz are available for viewing real time
Noise or Vibration data. The selected vibrational component with related component
identifiers is displayed at the bottom of the screen.
The following information is displayed on the screen:
• Current time in the upper right corner.
• Selected frequency band below the time at the lower right corner of the chart.
• Engine speed in the upper left corner.
• Vehicle speed below engine speed.
• Y-axis identification on the left side of the chart (amplitude).
• Maximum amplitude in reverse video at the top left corner of the chart.
• The minimum amplitude in reverse video at the lower left corner of the chart.
• The selected vibration component in the lower left corner of the screen.
• Frequency of a selected signal at the cursor position.
• Magnitude of the selected signal in reverse video.
• Calculated vibration frequencies indicated by arrows at the bottom of the chart.
ACTIVE KEYS
u d Move cursor left or right.
l r Increase or decreases the amplitude range.
) Enter Pause mode.
! Change display to Barchart.
@ Increase frequency band of display.
a@ Decrease frequency band of display.
# Change selected component.
a% For Noise only, enters and exits A-weighted mode.
* Select gear position (vehicles with no data stream).
x Return to Main Menu.
Components identifier
OVERLAP is displayed when overlap
condition exists.
Engine speed
Vehicle speed
Maximum amplitude
Y-axis
Minimum amplitude
Selected component
Calculated vehicle speed indicator
Current time
Current frequency
Magnitude of signal at cursor position
Frequency of signal at cursor position
Current frequency
AMPLITUDE
RANGES FOR
VIBRATION
IN dBg
MIN MAX
020
*10 30
15 35
20 40
25 45
30 50
35 55
40 60
Default
AMPLITUDE
RANGES FOR
NOISE
IN dB
MIN MAX
43 75
*65 85
75 95
85 103
Default
Commentaires sur ces manuels