Balmac 200 Manual page 5

Page 5
Step 4 - EXAMPLE: Taking a Measurement in
Velocity
1. Complete Step 1. Attach Magnetic Clamp (or Probe
Tip) to Transducer. Connect Transducer to proper
cable end and then connect the other cable end to the
Meter.
2. Complete Step 2. Select Velocity Mode.
3. Complete Step 3. Select 20 Range.
4. Secure Magnetic Clamp/Transducer assembly to
first measurement point. (See Vibration Directions and
Measurement Points later in this brochure)
5. Depress OFF/ON button until it latches. (Power ON -
Display comes on)
6. Depress VEL button until it latches. (Mode =
Velocity)
7. Depress 20 button until it latches. (Range = 20)
8. Allow readings to stabilize. (Do not be concerned if
the digits to the far right of the display vary up or down,
this is normal operation.)
9. Record reading.
Step 5 - What Direction to Measure?
Vibration is measured in
Vertical, Horizontal and
Axial directions. Test all
three to find the direction of
the strongest signal.
Typically, the Horizontal
(Radial) direction provides
the strongest signal.
Machine mountings can
influence readings. Spring
isolator mounted machines
may have strong vertical
readings.
Strong axial readings often
indicate a bent shaft or
loose bearings. Take
measurements in all three
directions whenever
possible.
Fig 12 - Vertical, Axial
and Horizontal
directions.
"B" Book Guide To Vibration Measurement
Step 6 - Where To Measure Vibration?
Vibration signals are
strongest at or near
bearings. They tend to
weaken as you move
farther away from
bearings. Example:
the vibration signal is
strongest on a direct
drive motor/fan
assembly on the
bearing closest to the
fan.
CAUTION: Extreme
care must be taken when working around rotating
machinery belts, pulleys, sheaves and shafts.
Step 7 - What Does the Reading Mean?
Refer to the Vibration Severity Chart .
Fig 14 - Typical Vibration Severity Chart
Example: an operator has set the Vibration Meter to
Velocity (VEL) on the 20 Range and has measured the
vibration level on a bearing in the Horizontal direction.
The reading is: 00.15 (Inches Per Second, Peak):
The operator would record the reading and then
compare the recorded reading with the Severity Chart to
determine the vibration severity.
Fig 13 - Typical measurement
points on a blower.