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20
For shock pulse measurement, press the UP arrow key in
the
Main
display to enter the
Bearing
display.
Make sure
the shaft diameter and rotational speed of the bearing,
or its dBi, have been entered
(se chapter Input data), or
the reading will be incorrect
.
From the
Bearing
display, press the transducer to the meas-
uring point. Measurement starts automatically, taking a few
seconds, during which the blue measuring LED is lit up.
The two measuring results are the maximum value, dBm,
and the carpet value, dBc. Depending on the dBm value,
the green, yellow or red light LED to the left of the display
will light up.
When an external transducer is used, the instrument will
display a
TLT
warning sign if the transducer line test result
is unsatisfactory. To see the TLT value for the latest read-
ing, go to the TLT menu. For further information about TLT,
please see chapter “Transducer Line Test”.
When measurement is finished, the LED indicators show
the bearing condition, and an evaluation code is displayed.
The code refers to the Evaluation Flow Chart on page 32-
33, which must be used to further evaluate the bearing
condition.
When you get high readings (yellow and red zone), you
should immediately verify their nature and probable cause.
Do not give the verdict ”bearing damage” before making
a further investigation. As a first measure:
• use the headphones to identify the shock pulse pattern.
• measure on and outside of the bearing housing to
identify the shock pulse source.
Surface temperature is measured automatically when an
SPM measurement is made.
To see the temperature read-
ing, use LEFT/RIGHT arrow keys to activate the
Return
icon in the
Bearing
display, then press the UP arrow key to
enter the
Main
display. Press the LEFT arrow key to enter
Temperature
mode and see the reading. To return to the
Main
display, press the LEFT arrow key.
Shock pulse measurement
Condition indicators:
red
- bad (≥35)
yellow - caution (21–34)
green - good (≤ 20)
Check:
- Shaft diameter and rpm, dBi set-
ting
- Measuring point in the load zone
- Probe pointed straight at the
bearing
- Adapter (transducer) properly
mounted
- Adapter surface clean, undamaged
- Quick connect transducer firmly
attached
Bearing measurement
Evaluation
code
Measure
(or press the
probe tip)
TLT warning