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The stream of shock pulses from a rotating bearing is con-
tinuous. They vary in strength, depending on the relative
positions of rolling elements and raceways.
The headphone is a means to verify and trace shock pulse
sources. The headphones allow you to listen to the shock
pulse pattern. In the headphone, the noise carpet is repre-
sented by a continuous tone. The dBc level is approximately
where you can start to distinguish between an even sound
and individual pulses. Typical for bearing signals is a random
sequence of strong pulses with no discernable rhythm, best
heard a few dB below the dBm level.
A spot of surface damage causing a strong shock pulse will
only register if a roller hits it during the measurement cycle.
Especially at low rotational speeds, the instrument can miss
the strongest pulse, simply because it does not occur during
the measurement cycle.
To listen to the shock pulse pattern after taking a shock
pulse reading:
1. Connect your headphones to the USB output connector
via the adapter.
2. From the Measurement display (A), press the RIGHT ar-
row key to enter the Listening function, where the dBm
value of the latest reading is displayed.
3. In the Listening display (B), use the UP/DOWN arrow keys
to adjust the amplitude level at which to listen; anything
below this level will be filtered out.
4. To adjust the headphone volume, use Use the LEFT/
RIGHT arrow keys to adjust the volume (0-7). NOTE!
Setting the volume to the maximum level may harm your
hearing.
NOTE: BearingChecker automatically adjusts the display
backlight to full brightness when using the Listening function.
When leaving the function, the backlight automatically
returns to the user-defined (or default) settings (see also
“Display contrast and screensaver timeout”).
To return to the Measurement display, press the BACK
arrow key.
Headphones
Listening to the shock pulse pattern
A
Measurement
dBn
Adjustment of
amplitude level
Listening
B
Amplitude (+)
Amplitude (–)
Volume (+)Volume (–)
BACK
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