Applications
Phase Analysis
5 - 8
Strobe Light
User
Manual
•
Start all measurements with the vibration
transducer mounted on a bearing housing in the
vertical direction. (This is a good habit to get
into). Aim the strobe light at the selected
reference mark and turn it on.
•
Adjust the flash rate to running speed and then
set it to the
LOCK
mode. Using the Phase
adjust, position the reference mark to the 12
o’clock position.
¾
Do not move the strobe location
between measurements.
To check for looseness:
•
Keeping the vibration transducer in the vertical
direction, move the vibration transducer from
the foundation to the base plate, then to a foot,
then to an area above any split line, and then to
the bearing cap. Note the phase angle at each
of these locations.
•
The reference mark should stay at the 12
o’clock position for each of these measurements.
If phase changes / shifts (probably to 6 o’clock)
at any of these measurement points, there is
looseness at the mechanical joint.
To check for unbalance:
•
If the vibration transducer is moved from the
vertical position on the bearing to another radial
position, the reference mark will move to the
new position when there is a significant amount
of unbalance. The reference mark will follow
the vibration transducer around the clock only if
the once per turn vibration is caused by
unbalance.
To check for alignment: