Guralp Systems Limited
MAN-BHO-0001 Güralp 3TB Operator's Guide

PreviousNext

1. Preliminary Notes 2. Introduction 3. First encounters 4. Installing the 3TB in a borehole 5. Calibrating the 3TB 6. Inside the 3TB 7. Connector pin-outs 8. Specifications 9. Revision history

Chapter 8. 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/ms-1

 

Acceleration sensitivity

2000 V/ms-2

Velocity sensors

Velocity output bandwidth

spec – 50 / 100 Hz*

 

Mass position output

DC – spec Hz*

 

Velocity sensitivity

2 × 1000 V/ms-1**

 

Mass position sensitivity

1000 V/ms-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

Waterproof, bayonet

Borehole diameter

89 – 229 mm

 

Temperature range (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†

See following notes:

* spec refers to the quoted frequency response value, e.g., for a “30 s” sensor, the value of spec would be 30 s = 0.033 Hz.

** Sensors are available with a range of sensitivities between 2 × 750 and 2 × 10,000 V/ms-1

† Because centring, locking, and unlocking consume varying amounts of power, it is recommended that you use a power supply capable of delivering 1 A at 12 V.

PreviousNext

1. Preliminary Notes 2. Introduction 3. First encounters 4. Installing the 3TB in a borehole 5. Calibrating the 3TB 6. Inside the 3TB 7. Connector pin-outs 8. Specifications 9. Revision history