5
mvip@mitech-ndt.com
Use measurement parameter key to select acceleration, speed, displacement.
4.5 Set Frequency Range
Use frequency range key to select “LO” or “HI”
4.6 Signal Output
The vibration signal is outputted by signal port, the port can connect the oscillometer or the
earphone(when the signal is at full range, output 2v peak value wave form).
1
Connect the earphone, long press the measurement key
2
Adjust the volume key, you can hear the vibration
3
Switch the frequency range, you can hear the high frequency and low frequency
4.7 Troubleshooting
MV 800 has low frequency and high frequency switch, can judge the fault of bearing and gear, when the
value of low frequency is higher than high frequency, it means the vibration is caused by low frequency,
we can consider bear problems, such as rotor imbalance, bearing bend, bearing not centered, base
loose, when the high frequency is 5 times bigger than low frequency, it means the vibration is caused be
high frequency, such as the deterioration of rolling bearing, gear tooth broken etc.
5. Cautions
When using integrated vibration meter, the strength on probe should between 5N-10N.
Pay attention to the right angle of probe
When using different probes, the results might be different(especially in high frequency)
Do not use pincers to avoid damage
Theoretically, MV800C can test acceleration of 199.9m/s, while in reality the collision of probe make
the test range lower than199.9m/s2, usually the limit of acceleration is 50m/s2.
6. The Standard of Vibration Intensity
The vibration is from structure design, manufacture, apply, adjust, it will cause metal fatigue, component
abrasion and other faults. The 10~1KHz low frequency vibration is mainly because metal fatigue, the
above 1KHz high frequency vibration is mainly because resonance.
Metal fatigue is proportional to vibration speed, the vibration power is proportional to speed square. No
matter metal fatigue or abrasion, it is proper to use speed standard. Compare the results with ISO2372,
we can know the device current running state.
