HUATEC HG904, User Manual, Page: 5 / 37

HUATEC Group Corporation www.huatecgroup.com
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
Rotation speed range for dynamic balancing: 70-60,000 r/min

Auto-range and manual-range selectable

Measuring accuracy of vibration: 5 %

Sensors: Piezoelectric accelerometer, Magnetoelectricity velocity, Eddy
displacement and etc.

8
th
-order ellipse anti-aliasing filter, RPM band-pass filter

Input signal: Accelerometer, and voltage

Amplitude spectrum analysis: 100 lines to 400 lines (zoom), Hanning windowed

Frequency span of spectrum analysis: 100, 200, 500, 1K, 2K, 5K, 10KHz(only for
1-channel sampling)

Data storage: 400 waveforms of 1024-points and 400 data sets

Amplitude ranges & Frequency Response for overall vibration measurement:
Amplitude ranges Frequency Response
Displacement 0.003
–
5 mm peak-peak 10
–
500 Hz
Velocity 0.2
–
200mm/s true RMS 10
–
1000 Hz
Acceleration 0.5
–
250m/s
2
peak 20
–
5000 Hz
Envelope 0.1
–
20unit true RMS 5-1000Hz from 15-40 KHz
Voltage 0.1
–
10V peak-peak 10
–
10000 Hz

Notepad: 10 condition codes for visual inspection

Output: USB for communication with PC

Power: Ni-MH rechargeable battery for 8 hours continuous operation, low battery
warning

Operating Environment: 0~55
o
C, 90% humidity non-condensing

Rotating speed measurement with photocell sensor

Dynamic Range: 60dB with 48dB adjustable gain range

Dimensions: 21×13×4 cm; Weight: 1.2 kg (Include batteries)
2 BALANCE PRINCIPLES
2.1 What is 1-plane rotor imbalance?
Rigid rotor works under the speed far less than its first-order critical rotate speed
and its deformation can be neglected. When the quality of the rigid rotor nearly
focuses on a disc, namely the ratio of its axial length and its diameter is less than 0.5;
we can do 1-plane balance on it and gain satisfactory result.
But for the flexible rotor, the deformation cannot be neglected. So its method of
balance differs from rigid rotor. However, the rotor with single imbalance plane can
also be balanced according to the method of 1-plane balance of rigid rotor. For above,
whether the rigid or flexible rotor, its quality of imbalance always focuses on one disc,
so both of them can be balanced according to the method of 1-plane rotor balance. In
the plant and manufactory, such rotating machines are ubiquitous, such as pump,
ventilator etc.
2.2 Principle of 1-Plane Balancing
HG904
’s 1
-plane balance adopts the method of influence coefficient, which is also
called balance method of 1-
plane phase measuring. Just as its name implies, it’s
desirous to do the measurement with the phase of rotation-speed vibration when
measuring the vibration amplitude of rotor. The rotation-speed vibration can be
indicated as vector. The process of 1-plane balance is as follows:
(1)
Measure and gain the initial rotation-speed vibration vector (A0) under the
normal operation condition.