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VM-4424S/H Instruction Manual
(Compatible with Version 2.16 or later)
Refer below for explanation of BRG and Hfunc.
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BRG (Bearing)
In BRG mode, processing is performed with a filter fixed in the 1kHz to 10kHz band.
In VM-4416, the range in this mode was A to E, and the unit was dimensionless.
However, VM-4424 displays the acceleration with the original physical quantity. There
are 6 ranges as well as acceleration.
Unlike normal measurement, “BRG” is displayed on the measurement screen and all
acceleration values are displayed (velocity and displacement are not displayed).
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Hfunc (H-function)
By enveloping the vibration amount and its fluctuation waveform at 2kHz to 15kHz,
the band that cannot be captured directly by BRG is also covered.
Unlike normal measurement, “Hfunc” is displayed on the measurement screen and all
acceleration values are displayed (velocity and displacement are not displayed).
DC output changes as follows according to the switching between AC and DC in
section 4-4-2 (AC output terminal always outputs only the fluctuation component).
(1) AC
Equivalent to “ENV” of VM-4416.
With this setting, only the fluctuation component (envelope waveform) of H-
function is rectified, and display and DC output are performed.
H-function is suitable for measuring a high component of 2kHz to 15kHz due to a
vibration source at a low period (1kHz or less).
It is possible to listen to sound that is converted the band signal that cannot be
heard to 1kHz or less signal.
(2) DC
Rectifies the 2kHz to 15kHz component, and displays and outputs the level and the
fluctuation component (envelope) of 1kHz or less.
This is called H-function.
About H-function, refer to also the definitions in section 10.
