Japan, Tokyo Sokushin
Tokyo Sokushin VSE-355G3 Servo Velocity-meter
Product: made in Japan
Manufacturer: Tokyo Sokushin
Model: VSE-355G3
Ground type velocity-meter with built-in wider broad band and higher resolution tri-axis, and possible to measure from micro to strong motion.
BROADBAND
2m/s & 20m/s2 (2000Gal) Maximum 146dB Dynamic Range 0.008Hz to 70Hz 2m/s & 20m/s2
(2000Gal) Maximum
146dB Dynamic Range
0.008Hz to 70Hz
( Strong Motion )
(～ Micro Earthquake )
a) The data are extracted from “Performance of the VSE-355G2 Strong Motion Velocity SeismometerReport to the IRIS-GSN Sub-Committee’. Clinton, J.F. and Heaton, T.H.,Caltech, 2002”
b) VSE-355G3 is revised model of VSE-355G2.
Specifications
| Model | Servo Velocity Seismometer VSE-355G3 |
| Mode of operation | Tri-axial |
| Frequency range | 0.008 to 70Hz |
| Max. measuring range | ±2m/s, 20m/s2 (±2000Gal) |
| Sensitivity | 5V/m/s × 2 |
| Max. Output voltage | ±20V(Balanced output) |
| Tilt Output | 5.13V/0.1degree |
| Resolution | 10-8m/s2 (10-6Gal) |
| Dynamic range | 146dB |
| Calibration coil | 15μA/Gal, 1000Ω |
| Linearity | Less than 0.03% |
| Cross axis sensitivity | 0.50% |
| Sensitivity of Temperature coefficient | 0.01%/℃ |
| Temperature coefficient of zero-shift | 0.05%/℃ |
| Power requirements | ±15VDC |
| Current consumption | 150mA |
| Arrester | Voltage 30V, Current 5kV, 100A |
| Temperature range | -10℃ to 50℃ |
| Allowable shock | 30G (less than 0.1sec) |
| Dimension | 330 × 330 × 243.1 mm |
| Enclosure | Waterproof 1kg/cm |
Frequency response
Comparison of Noise Specter
The clip level of VSE is larger than STS-2. Therefore the noise level of VSE is larger than STS-2.
Calculated Ground Displacement
It is generally observed the abnormal results in calculated displacement from the accelerometers however normal results are observed from the velocity.
(Actual result at 1995.1.17 Hanshin-Awaji Strong motion earthquake) 
Recording Range
VSE-355G3 can record the important seismic signals shown by blue area.
Dimension
The specification may change without notification because of the proved product.
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