Japan, Tokyo Sokushin
Tokyo Sokushin VSE-15D-1 Servo Velocity-meter
Product: made in Japan
Manufacture: Tokyo Sokushin
Model: VSE-15D-1
Useful for
Survey of an underground structure.
After shock
Micro-tremor
Micro-earthquake
Any of vibration Experiment
Feature
Sensibility is higher than accelerometer
Dimension
SPECIFICATION
| Model | VSE-15D-1 |
| Frequency range | 0.1 to 70Hz |
| Mode of operation | Horizontal, Vertical |
| Max. measuring range | ±0.1m/s |
| Output | Velocity (Low): 100V/m/s, (High): 1000V/m/s
Acceleration: 5mV/Gal |
| Max. Output voltage | ±10V |
| Linearity | 0.03% of Full scale |
| Resolution | 10-7m/s2 (10-5Gal) |
| Dynamic range | Approximately 140dB |
| Damping ration | h = about 10000% |
| Calibration coil | Sensitivity: 600μA m/s2 (6μA/Gal)
Coil resistance: 550Ω (±20%) |
| Max. Output voltage | ±10V |
| Power requirements | ±15VDC |
| Current consumption | Approximately 15mA |
| Cross axis sensitivity | 0.03G/G |
| Sensitivity of temperature coefficient | 0.01%/℃ |
| Temperature coefficient of zero-shift | 0.05%/℃ |
| Temperature range | -10℃ to 50℃ |
| Allowable shock | 30G (less than 0.1Sec) |
| Dimension | 55 × 69.5 × 72 mm |
Principle
The principle of servo velocity seismometers is similar to general servo accelerometers, but it
adapts the differentiating circuit in the feedback circuit. 
The sensitivity of velocity seismometer is determined by the stable elements of the M, R, r, C and G. Therefore, the change in α and the scale factor of amplifier (A) do not affect the characteristics of the velocity seismometer.
This is a good point of servo velocity seismometer, and it is possible to maintain the stable sensitivity and characteristics for a long period.
The specification may change without notification because of the proved product.
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