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.