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Installing the Machine Condition Transmitter
Peak-to-Peak Measurements with the Microlog (Acceleration and Enveloped
Acceleration)
SKF Machine Condition Transmitter 4- 7
User Manual
range of the enveloper circuitry in the Vib Pen Plus is
fixed between 5 kHz and 10 kHz to obtain a general
bandwidth where low frequency influences, due to hand
held operation, are eliminated.
Detection methods of the Microlog and Multilog are, in
general, based upon detecting a maximum and minimum
peak value within the whole time period of the
measurement. From this peak-to-peak value, the zero
peak value is calculated. The RMS value is always
derived from the calculated spectrum and is not a true
RMS conversion on the dynamic time signal (unlike the
MCT modules).
Furthermore, MCT modules use averaging methods to
prevent unwanted fluctuations. The number of averages
for the Multilog and Microlog are free selectable. It is
advised to select 4 to 8 averages to create a comparable
total measurement time period.
Guidelines for using the Microlog as an analysis
instrument in combination with the MCT modules are
provided:
Peak-to-Peak Measurements with the Microlog
(Acceleration and Enveloped Acceleration)
The buffered vibration output is used as an input signal
to the Microlog. The selected enveloped acceleration
filter setting for the Microlog must be equal to the filter
choice on the enveloped acceleration transmitter. The
maximum frequency must be set at twice the value of the
selected low corner cut off frequency of the enveloped
acceleration filter (for example, filter 500 Hz to 10 kHz
results in a maximum analyzing frequency of 1 kHz).