HUATEC Group Corporation www.huatecgroup.com
P a g e 3 4 o f 3 7
You may observe the details of amplitude spectrum by ZOOM function. After
moving the cursor to a interesting frequency, press
Zoom
to see the 4 times detailed
spectrum.
//(10) Transfer Function
Transfer function is the spectrum in proportion to the ratio of output and input
signal amplitudes (B/A) in every frequency.
Notice:
valid only for dual channel measurement.
(11) Rotation Speed Measurement
HG904 measures rotation speed by using a photoelectric sensor to detect the light
reflected from a piece of reflecting paper on the rotating axis. The measuring method
is as the following:
1). Connect the photoelectric tacho sensor with HG904, and make the lighting end
of the sensor to aim at the piece of reflecting paper affixed on the rotating axis.
2). Press
〖
On/Off
〗
,
power on HG904. Press
〖
Speed
〗
.
//If you want to stop the measurement of rotational speed, press
〖
EN TER
〗
for a
while, then release it.
The rotational speed may be saved with waveform in order to diagnose machinery
faults. The method is to measure the rotational speed first and then measure the
vibration.
(12) Special Explanation
Acceleration envelope analysis
HG904 use high-pass filter and the demodulation method to separate the envelope