Guralp Systems Limited
MAN-030-0001 - Güralp 3T Operator's guide

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1. Preliminary Notes 2. Introduction 3. Installing the 3T 4. Calibrating the 3T 5. Accessories 6. Inside the 3T 7. Connector pin-outs 8. Specifications 9. Revision history

Chapter 8. Specifications

SYSTEM

Technology

Force feedback (force-balance) velocity sensor

Configuration / Topology

Triaxial orthogonal (ZNE)

PERFORMANCE

Velocity output band

(flat response within -3 dB crossing points)
120 s (0.0083 Hz) to 50Hz standard
360 s (0.0017 Hz) to 50 Hz option available
Contact Güralp to discuss other frequency response options

Output sensitivity

1500 V/msˉ¹ (2 x 750 V/msˉ¹) differential standard output
(full-scale clip level of 13 mm/s)
Contact Güralp to discuss alternative high sensitvity (high gain) options

Peak full-scale output voltage

Differential: ±20 V (40 V peak-to-peak)
Single-ended (e.g. mass positions): ±10 V (20 V peak-to-peak)

Self-noise below NLNM

(New Low Noise Model; Peterson, 1993, USGS) 100 s (0.01 Hz) to 10 Hz*

Sensor dynamic range
(at standard output sensitivity)

161 dB @ 1 Hz
157 dB @ 5 Hz

Cross axis rejection

65 dB

Linearity

>90 dB

Lowest spurious resonance

>140 Hz

Damping

70% of critical

Operating tilt range

±2.5°

MASS / MONITORING CONTROL

Sensor Mass positions

Three independent sensor mass position outputs (single-ended)

Mass locking

Remote auto mass lock/unlock for transportation

Mass centring / offset zeroing

Remotely controlled automatic mass centring

CALIBRATION

Calibration input

Independent signal and enable lines exposed on sensor connector

CONNECTORS

Analogue output

26-pin Mil-spec (military specification bayonet) connector
Optional 1500 psi waterproof connector for posthole deployment

POWER

Power supply voltage

10–36 V DC

Power consumption

0.75 W at 12 V DC *

PHYSICAL / ENVIRONMENTAL

Operating temperature range

-20 to +75 °C **

Operating humidity range

0-100% relative humidity

Enclosure ingress protection

IP68 - protection against prolonged effects of immersion under pressure (tested under 3 metres of water for 72 hours)

Enclosure material

Stainless steel case
O-ring seals throughout

Diameter

167 mm

Height with handle

340 mm

Weight

14.6 kg

Alignment

Bubble level on lid; north arrow on handle and base; adjustable feet

* 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.

** Temperatures below –20 °C may be accommodated with additional care. Please consult Güralp Systems for advice.

PreviousNext

1. Preliminary Notes 2. Introduction 3. Installing the 3T 4. Calibrating the 3T 5. Accessories 6. Inside the 3T 7. Connector pin-outs 8. Specifications 9. Revision history