Select measure location then tap MEASURE.
Use the numeric keyboard and enter the measured temperature.
Envelope spectrum acceleration
Envelope analysis is used to detect periodic impacts in the vibration signal of machines. Its
primary use is in the diagnosis of roller bearing damage and gearing damage, and is based on
the demodulation of amplitude modulated vibration signals.
Periodic impact sequences in a component excite high frequency machine resonances that
serve as a carrier signal of the low frequency impact signal. To separate the low frequency
modulation from the high frequency resonance, the signal is filtered with a high pass filter, rec-
tified and then filtered using a low pass filter. The remaining signal consists of only the mod-
ulation signal, which is referred to as envelope.
Spectrum acceleration
The amplitude spectrum of the vibration acceleration (broadband spectrum) is used to find the
excitation regions of machines.
For example, in roller bearings, noise is excited in higher frequencies.
Spectrum velocity
The amplitude spectrum of the vibration velocity (machine spectrum) is used to machine prob-
lems such as imbalance and misalignment.
Time waveform
Time waveform is the raw signal used to show informational content of a machine from
moment to moment. It is used in low speed applications, roller bearing damage and gear dam-
age, and looseness.
Visual inspection
A visual inspection task is data collection based on defined conditions of a machine and that
cannot be measured with electrical signals. For example, the degree of contamination of a
machine, the belt tension on a drive or the fill level of a tank. These can all be ascertained
without having to measure a signal.
VIBXPERT 3 67
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