MAN-030-0001 - Güralp 3T Operator's guide

Chapter 8. Specifications

SYSTEM	Technology	Force feedback (force-balance) velocity sensor
SYSTEM	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	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.