Geo Space Geophysical Instrumentation

GS-11D
Rotating Coil Geophone

Field proven design
Shock resistant, rotating dual coil construction
Gold plated contacts for positive electrical connection
Precision springs, computer designed and matched
Full one year warranty

	The GS-11D is a high output, rotating coil geophone designed and built to withstand the shocks of rough handling. The precision springs of this field proven geophone are computer designed and matched to optimize performance specifications even under the most extreme conditions.

	Gold plated contacts assure positive electrical connections. The Geo Space manufacturing process includes checking all geophone operating parameters with the ATS, an automated computerized test system.

	Natural frequencies are 4.5, 8, 10 and 14 Hz, with standard coil resistance of 380 ohms. The PC-21 Land Case is used with the GS-11D geophone.

GS-11D Specifications
Natural Frequency	4.5 ± .75 Hz	8 ± .75 Hz	10 ± .75 Hz	14 ± .75 Hz
Coil Resistance @ 25°C ± 5%	——380 Ohms ——
Intrinsic Voltage Sensitivity with 380 Ohm Coil ± 10%	——.81 V/in/sec (.32 V/cm/sec) ——
Normalized Transduction Constant (V/in/sec)	——042 (sq.root of Rc) ——
Open Circuit Damping	.34 ± 20%	.39 ± 10%	.32 ± 10%	.23 ± 10%
Damping Constant with 380 Ohm Coil	762	602	482	344
Optional Coil Resistances ± 5%	——56,160 Ohms ———
Moving Mass ± 5%	23.6 g	16.8 g	16.8 g	16.8 g
Typical Case to Coil Motion P-P	.07 in	.07 in	.07 in	.07 in
	(.18 cm)	(.18 cm)	(.18 cm)	(.18 cm)
Harmonic Distortion with Driving Velocity of 0.7 in/sec (1.8 cm/sec) P-P	N/S	————0.2% or less ————
		@ 12 Hz	@ 12 Hz	@ 12 Hz
Dimensions
Height (less terminals*)	—————1.32 in (3.35 cm) —————
Diameter	—————1.25 in (3.18 cm) —————
Weight	—————3.9 oz (111 g) —————

*terminal height is .135 inches

Click HERE to load chart for Seismic Detector Response Curve Output VS. Frequency (GS-11D @ 4.5 Hz @ 380 Ohms & GS-11D @4.5 Hz @ 4000 Ohms). (115 KBytes)

Click HERE to load chart for Seismic Detector Response Curve Output VS. Frequency (GS-11D @ 10 Hz @ 380 Ohms). (60 KBytes)

Cases Available PC-21 Land Case

Specifications are subject to change without notice.