Geophone

GS-30CT

Feature IThe GS-30CT represents the ultimate refinement in geophone design to date. This new geophone is offering heretofore unattainable geophone-to-geophone uniformity, distortion reduced by a factor of 2.5 and tighter tolerance on geophone parameters: New standard �} 2% Channel-to-channel uniformity and elimination of self-generated noise and distortion is the essence of seismic data. Towards this end, the performance of the GS-30CT is clearly unsurpassed. It is a field-proven match for the most advanced 24-bit Data Acquisition Systems. 3 Year Warranty

Specifications Specifications calculated at 25��C. Orientation is Vertical to 20��. Maintains all specifications at Vertical to 20�� tilt. Exception: Harmonic Distortion at 12 Hz (Vertical only). Frequency : Natural Frequency (Fn) : 10 Hz �} 2% Typical Spurious Frequency : > 160 Hz Resistance : Standard Coil Resistance : 395 ohms �} 2% Distortion : Harmonic distortion with coil to case velocity of 0.7 in/sec (1.8 cm/sec) @ 12 Hz and coil to case displacement of 0.0093 in (0.0236 cm) P-P @ 12 Hz : <0.08% With coil to case displacement of 0.0093 in (0.0236 cm) P-P @ 12 Hz : <0.12% Sensitivity : Intrinsic Voltage Sensitivity (G) : 0.698 V/in/s, 0.275 V/cm/s Sensitivity @ 70% Damping : 0.500 (V/in/sec), (.197 V/cm/sec)�} 2% Normalized Transduction Constant : 0.0351 sq.root of DCR; V/in/s 0.0138; sq.root of DCR; V/cm/s Damping : Open Circuit Damping (Bo) : 0.316 Shunt Resistance for Damping Calibration for 395 ohm coil : 60% damping �} 2%: 1500 ohms, 70% damping �} 2% : 1000 ohms Damping Constant (BcRt) 536 Physical Specifications Moving Mass (M) : 0.395 oz., 11.2 g �} 2% Case to Coil Motion P-P: 0.060 in (.152 cm) Operating and Storage Temperature : -45��C to +100��C Dimensions (less terminals*) : Height 1.30 in (3.30 cm) Diameter 1.00 in (2.54 cm) Weight 3.03 oz (86 g) * terminal height is .16 in (.41 cm) Cases Available: PC-801-LP Land Case PC-801-LPC Land Case PC-901-LP Marsh Case Specifications are subject to change without notice. Chart for Seismic Detector Response Curve Output VS. Frequency.

GS-32CT GS-32CT

Features Spurious response greater than 250 Hz for extended clean band width Full compatibility with GS-20DX and GS-30CT geophones Typical string distortion less than .03% (12 series, damped .70) High sensitivity option available 3-Year Warranty

Specifications (At 25�� C) Maintains all specifications at vertical to 20�� tilt with the following exception : Harmonic distortion at 12 Hz (vertical to 10�� tilt). Natural Frequency (Fn) : 10 Hz �}2.5% Coil Excursion P-P : > 0.040 in( > 0.102 cm) MIN, > 0.060 in, (> 0.152 cm) MAX Clean Band Pass (Spurious Response) : > 250 Hz (Typical) DC Resistance (DCR) : 395 ohms �}2.5% Intrinsic Voltage Sensitivity (G) : 0.698 V/i/s, (0.275 V/cm/s) Open Circuit Damping (Bo) : 0.316 Damping w/1000 ohm Shunt : 0.70 �}2.5% Sensitivity @ 70% Damping : 0.500 V/in.s, (0.197 V/cm/s) �}2.5% Moving Mass (M) : 0.395 oz., (11.2 g) �}2.5% Harmonic Distortion : With coil to case velocity of 0.7 in/sec (1.8 cm/sec) P-P @ 12 Hz : <0.10% String, 12 series, damped 0.70 : <0.03% (Typical) With coil to case displacement of 0.0093 in (0.0236 cm) P-P @ 10 Hz : <0.20% Dimensions : Weight : 3.03 oz.(86 g) Diameter : 1.00 in., (2.54 cm) Height (less stud & terminals) : 1.30 in., (3.30 cm) Specifications are subject to change without notice. Chart for Seismic Detector Response Curve Output VS. Frequency. .