172-65411MA-05 (PT1) 5 Jun 2019
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10. Bearing Inspection
The PT1 can measure and display vibration acceleration levels (dB). This information
is useful for checking and determining the operational condition of bearings. This
section explains the features and proper measurement procedure for using PT1 for
bearing inspections.
10.1 Special
PT1
Features for Bearing Inspections
PT1 has several special functions particular to its bearing inspection mode.
1) Bearing measurement data can be displayed in three different modes. Refer to
“10.5 Display During and After Measurement” for details on displayed information,
and section “12.3 View Mode Selection” for instructions on how to modify this
display setting.
2) The average value from 9 individual measurements can be saved for one record.
This is used when measurements are subject to high fluctuations and a longer
term average is desired. See 10.6 for procedure details.
3) The CF (Crest Factor) value is automatically calculated and displayed. If the CF
value is large, the bearing may be scratched or damaged; if the CF value is small,
new lubrication packing may be required.
4) The LED indicator on the PT1 will flash once preset conditions for the
measurement completions have been reached. See section “12.7 LED Indicator
Flash Setting” for setting detail. The possible set conditions are as follows:
- 10 seconds have passed since the measurement began
- The measured vibration acceleration level stabilizes
- The surface temperature stabilizes
5) One of two
different calculation methods can be selected. See section “12.6
Calculation Type” for selection details.
Converge
: The average measured value from all intervals is displayed. The value
converges with time as instantaneous measurements vary.
Interval
:
The value from the current measurement interval is displayed. This is
useful to visualize instantaneous variations.
10.2 Mode Selection
1)
Set the mode to “Bearing”. If already set to “Bearing”,
the following operation is unnecessary.
a) With the power on, simultaneously press [
]
[ENT].
b) Press [
] or [
] to highlight “Bearing”.
c) Press and hold [ENT] for more than 1 second.
Mode
Trap&Valve
Bearing
