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7 specifications – Guralp Systems CMG-3TB User Manual

Page 76

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CMG-3TB

7 Specifications

Hybrid sensors

Velocity output bandwidth 0.1 – 50 Hz

High pass filter output flat

to acceleration

0.01 Hz –

spec*

High pass filter output flat

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 / 100 Hz*

Mass position output

DC –

spec Hz*

Velocity sensitivity

2 × 1000 V/m/s**

Mass position sensitivity

1000 V/m/s

2

Controls

Mass locking and unlocking remotely operated

Mass centring

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†

Current at 24 V DC during
centring (average)

115 mA†

Current at 24 V DC during
locking and unlocking

200 mA†

76

Issue C

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