Vibration measuring systems

Low Frequency Vibration Signal Conditioner (VM-5123/6)

A compact signal amplifier to make optimal signal processing
It is used for vibration acceleration measurement, waveform observation and various analysis. In addition, vibration data can be output to instruments like recorders.
Low Frequency Vibration Signal Conditioner (VM-5123/6)


■ Compact and light weight (920 g)
■ 6 channels (vibration signal inputs) + 2 channels (voltage signal inputs)
■ Connectable to 3-axis pickup
■ Sensitivity range change over & low-pass filter
■ High signal / noise ratio

System Composition

Makes optimal signal processing being connected with the servo type accelerometer. It is used for vibration acceleration measurement with AC voltage meter, waveform observation with oscilloscope and various analysis with FFT analyzer.

system composition


Item Specification Notes
Measurement channel Vibration input x 6 (CH1–CH6)
Voltage input x 2 (CH7–CH8)
Voltage inputs from servo type accelerometer (single axis type, 3-axis type)
Capable of input voltage signal such as noise level meter, pressure meter, thermometer and hygrometer
Input combination CH1–CH6 AC/DC
CH1–CH6 AC : 0.1 Hz–DC : Zero adjustment / Gravity acceleration cancellation
CH7–CH8 DC only
Frequency response


 0.1 Hz / DC to 12 Hz (±0.5 dB)
 0.1 Hz / DC to 30 Hz (±0.5 dB)
 0.1 Hz / DC to 60 Hz (±0.5 dB)


 DC to 12 kHz (±0.5 dB)
 DC to 50 kHz (±0.5 dB)

 Variable low-pass filter
 to be set as (fc=20 Hz, 50 Hz, 100 Hz)
 Low-pass filter
 to be set on or off (fc=20 kHz)
Measurement range


 0.01 m/s2, 0.1 m/s2, 1 m/s2, 10 m/s2


 ±5 V full scale voltage signal

Output signal ±5 V full scale voltage waveform signal 1 signal route (for recorder)
Linearity ±0.5 % full scale
Inter range error ±2 %
S/N ≧60 dB to 100 dB ≧ 100 dB (measurement range : 10 m/s2)
≧ 96 dB (measurement range : 1 m/s2
≧ 80 dB (measurement range : 0.1 m/s2
≧ 60 dB (measurement range : 0.01 m/s2
Calibration signal
12 Hz full scale Calibrated for 0.01 m/s2
External control Measurement range low-pass filter Controlled by TTL level signal
Power supply DC9 to 12 V 5A
Power consumption 4W Increases by (0.8 x axis number) W connected with pickups
temperature range
0 to + 50 ゚C
Size / Mass 240 (W) x150 (D) x35 (H) mm / Approx.920g


Item Content Notes
Output cable Mini plug-BNC 1.5 m
Battery pack Continuous operation : ≧ 3hrs. for 6ch. Battery for lap top PC

Servo type accelerometer (VP-5123HHV)

Item Specification
Sensitivity direction HHV 3 directions
Maximum measurable acceleration 29.4 m/s2
Sensitivity 0.204V m/s2 (±5 % ≦)
Frequency range DC–100 Hz
Natural frequency > 400 Hz
Linearity ±0.1 % full scale
Resolution ≧ 4.9 x 10-5 m/s2
Power supply voltage DC±11 to 16 V
Operational temperature range -25 to +70 ゚C
Structure Dust-proof, Drop-proof (IP65)
Cable connection Waterproof connector
Material Aluminum die casting
Mass 3
Self-testing Non