Japan, Tokyo Sokushin
Tokyo Sokushi VSE-15A Servo Velocity-meter
Product: made in Japan
Manufacturer: Tokyo Sokushin
Model: VSE-15A
Useful for
Survey of an underground structure.
Earthquake monitoring
Aftershock
Micro-tremor
Any vibration Experiment
Feature
Sensibility is higher than the accelerometer
Dimension
SPETIFICATION
| Model | VSE-15A (custom made order) |
| Frequency range | 0.1～100Hz |
| Mode of operation | Horizontal, Vertical |
| Max. measuring range | ±1m/s (±100kine) |
| Output | Velocity : 10cm/s/v、Acc:5mV/gal |
| Output resistance | Less than 50 Ohm |
| Max. Output voltage | ±10V |
| Linearity | 0.03％ of Full scale |
| Resolution | 10-4 gal(Less 200μkine) |
| Dynamic range | Approximately 140dB |
| Damping ration | h = about 10000% |
| Calibration coil | ・Sensitivity : 350μA m/s2 (3.5μA/gal)
・Coil resistance : 550Ω（±20％） |
| 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℃～70℃ |
| Waterproof | IP65 |
| Connect cable | Shielded 4 pair twist cable |
| Allowable shock | 30G (less than 0.1Sec) |
| Dimension | 61×61×72(H) |
PRINCIPLE
The sensing mechanism is similar to force balanced servo accelerometers except the time differential part is adapted in feed back circuit.
The output [Eout] means very stable and high accuracy because unstable and nonlinear elements for sensing are not included in this expression. The M, r, G, C, R are all stable solid parts, this is important for guarantee the accuracy.
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