CMG-3V
Appendix B Specifications
Hybrid sensors
Velocity output bandwidth 0.1 – 50 Hz
High pass flter output fat
to acceleration
0.01 Hz –
spec
*
High pass flter output fat
to velocity
spec
– 50 Hz*
Mass position output
DC – 0.1 Hz
Velocity sensitivity
1400 V/m/s
Acceleration sensitivity
2000 V/m/s
2
Velocity sensors
Velocity output bandwidth
spec
– 50 Hz*
Mass position output
DC –
spec
Hz*
Velocity sensitivity
2 M 1000 V/m/s**
Mass position sensitivity
1000 V/m/s
2
Controls
Mass locking and unlocking remotely operated
Mass centring
automatic,
microprocessor
controlled
Mechanics and
electronics
Sensors
3 orthogonal sensors,
each 0.180 kg
Lowest spurious resonance above 140 Hz
Sensor transducer type
capacitive displacement
Feedback transducer type
magnet/coil
Connector
pressure tight,
waterproof
Borehole diameter
89 – 229 mm
Temperature range with
masses locked
–20 to +75 °C
Operational temperature
range
–10 to +65 °C
Power
Supply requirements
11 – 36 V DC
Current at 24 V DC
75 mA†
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