19
Bearing Measurement
Input data
For a reading of bearing condition with Bearing Checker, you need
the initial value, dBi. If you do not know the bearing´s dBi, Bear-
ing Checker will calculate and display the dBi given the rotational
speed (rpm) and the shaft diameter. Neglecting to enter this
information will produce incorrect measurement results.
Entering shaft diameter and rpm for dBi
calculation
From the Main display, press the UP arrow key to enter Bearing
mode. Use LEFT/RIGHT arrow keys to highlight the Input Data
icon, then press the UP arrow key. Use the LEFT/RIGHT arrow keys
to position the cursor and the UP/DOWN arrow keys to increase or
decrease the rpm value, respectively. To enter the shaft diameter,
first press the measuring key, then use the arrow keys to set the
diameter value the same way rpm was set.
Press the measuring key to return to Bearing mode.
Entering dBi manually
Changing the dBi directly is faster when you know it from your
records:
From the Main display, press the UP arrow key to enter Bearing
mode. Use LEFT/RIGHT arrow keys to highlight the dBi icon,
then press the UP arrow key. First, position the cursor using the
LEFT/RIGHT arrow keys, then use the UP/DOWN arrow keys to
increase or decrease the dBi value, respectively.
The highest dBi value that can be entered is +60, the lowest -9.
Any attempt to enter values below this results in dBi = “- -” and an
unnormalized shock pulse reading (see also chapters “Normalized
shock pulse values with dBi” and “Readings on gearboxes”). To
set the dBi value back from “- -” to “+” or “-”, press the UP arrow
key, then position the cursor as required to set the dBi.
Press the measuring key to return to Bearing mode.
The dBi value, whether calculated by the instrument or manually
input, is shown in the lower right part of the Bearing display.
shaft
diameter ø
rpm
Bearing
measurement
Enter rpm
OK
OK
Enter shaft diameter
Enter dBi value
OK
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