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HD-S series digital geophones are designed with advanced technology, Its popular name:" Super Digital Seismic Geophone", they have high spurious frequency, perfect disturbance resistance, all parameters are controlled within ±2.5%,the distortion is lower than 0.1%.With good stability, high accuracy, plenteous signal, S Series are suitable to all kinds of accurate seismic exploration. All parts are made in precision, and the technique is mature and stable.

HD-10ES= SM-24 (I/O), HD-10XS= GS-32CT(GEOSPACE)

Main Specifications(20℃)
Parameter\Mode	HD-10ES (20℃)	HD-10XS (25℃)	HD-40S (20℃)
Natural Frequency	10±2.5%	10±2.5%	40±2.5%
Coil Resistance	375±2.5%	395±2.5%	755±2.5%
Sensitivity	28.8±2.5%	27.5±2.5%	36±2.5%
Sensitivity With Shunt Resistor	22.8±2.5% (1339Ω)	19.7±2.5% (1000Ω)	33±2.5% (8200Ω)
Damping	0.25+5%/-0%	0.316±2.5%	0.60±2.5%
Damping With Shunt Resistor	0.60+5%/-0% (1339Ω)	0.70±2.5% (1000Ω)	0.631±2.5% (8200Ω)
Distortion	≤0.1	≤0.1	≤0.1
Spurious frequency	≥240	≥240	≥240
Max. Motion	2	1.5	1
Moving Mass	11	11.2	9.2
Dimensions	25.4×34	25.4×34	26×34
Temperature Range	-40--+100	-40--+100	-40--+100
Warranty Period	3	3	3
Case Type

HD- B series digital geophones are mainly used in petroleum exploration. The series have wide frequency band. High spurious frequency and all parameters are controlled within ±5%. B Series have good stability, high accuracy, plenteous signal and its unique double coils structure considerably lowers the distortion, the coil can be within 360° freely which can effectively eliminate surface disturbance, so they have wonderful S/N, little phase displacement and high dynamic performance. With good temperature adaptability, they are suitable to all kinds of seismic exploration.

Main Specifications(20℃)
Parameter\Mode	HD-4.5B	HD-10B	HD-14B	HD-28B	HD-35B	HD-40B	HD-60A	HD-100A
Natural Frequency	4.5±10%	10±5%	14±5%	28±5%	35±5%	40±5%	60±5%	100±5%
Coil Resistance	375±5%	375±5%	375±5%	390±5%	560±5%	548±5%	940±5%	1084±5%
Sensitivity	28.8±5%	28.8±5%	28.8±5%	30.0±5%	32.5±5%	32.5±5%	55±5%	39±5%
Sensitivity With Shunt Resistor		22.8±5% (1400Ω)	18.2±5% (640Ω)	28.5±5% (7500Ω)
Damping	0.60±5%	0.271±5%	0.20±5%	0.60±5%	0.60±5%	0.615±5%	0.65±5%	0.42±5%
Damping With Shunt Resistor		0.60±5% (1400Ω)	0.60±5% (640Ω)	0.632±5% (7500Ω)
Distortion	≤0.2	≤0.2	≤0.2	≤0.2	≤0.2	≤0.2	≤0.2	≤0.2
Max. Motion	4	2	2	1.8	1.8	1.8	1	1
Moving Mass	11.3	11.3	11.3	10.1	9.3	9.3	11.5	7.6
Dimensions	25.4×36	25.4×32	25.4×32	25.4×32	25.4×32	25.4×32	27.5×34	27.5×34
Temperature Range	-40--+70	-40--+70	-40--+70	-40--+70	-40--+70	-40--+70	-40--+70	-40--+70
Warranty Period	3	3	3	3	3	3	3	3
Case Type

HD-D series digital geophones are mainly used in petroleum exploration. They have the same parameters with 20DX series and may exchange with 20DX series, but its unique double coils structure considerably lowers the distortion, and greatly more accurate, more wonderful dynamic performance. D series have small volume, light weight, stable technical capability, perfect accuracy, wonderful dynamic performance and long life.

Main Specifications(22℃)
Parameter\Mode	HD-8D	HD-10D	HD-14D	HD-28D	HD-40D
Natural Frequency	8±5%	10±5%	14±5%	28±5%	40±5%
Coil Resistance	395±5%	395±5%	395±5%	395±5%	575±5%
Sensitivity	28.0±5%	28.0±5%	28.0±5%	39.0±5%	42.0±5%
Sensitivity With Shunt Resistor	20.0±5% (1000Ω)	20.0±5% (1000Ω)	20.0±5% (1000Ω)	28.0±5% (1000Ω)	30.0±5% (1000Ω)
Damping	0.38±5%	0.30±5%	0.22±5%	0.27±5%	0.42±5%
Damping With Shunt Resistor	0.70±5%	0.70±5%	0.50±5%	0.56±5%	0.57±5%
Distortion	< 0.2	< 0.2	< 0.2	< 0.2	< 0.2
Max. Motion	1.5	1.5	1.5	1.5	1.5
Moving Mass	11	11	11	11	11
Dimensions	25.4×32	25.4×32	25.4×32	25.4×32	25.4×32
Temperature Range	-40--+70	-40--+70	-40--+70	-40--+70	-40--+70
Warranty Period	3	3	3	3	3
Case Type

HD-X series digital geophones are mainly used in petroleum exploration; the down_lead cable insures the stability of DC resistors. X series have small volume, light weight, stable technical capability, perfect accuracy, high spurious frequency, good disturbance resistance, wonderful S/N and dynamic performance, they are suitable to all kinds of seismic exploration. PS-10X can be exchanged with GS-20DX(GEOSPACE).

Main Specifications(20℃)
Parameter\Mode	HD-8X	HD-10X	HD-14X	HD-28X	HD-40X
Natural Frequency	8±10%	10±5%	14±5%	28±5%	40±5%
Coil Resistance	395±5%	395±5%	395±5%	395±5%	575±5%
Sensitivity	28.0±5%	28.0±5%	28.0±5%	39.0±5%	42.0±5%
Sensitivity With Shunt Resistor	20.0±5% (1000Ω)	20.0±5% (1000Ω)	20.0±5% (1000Ω)	23.0±5% (1000Ω)	30.0±5% (1500Ω)
Damping	0.38±5%	0.30±5%	0.22±5%	0.27±5%	0.37±5%
Damping With Shunt Resistor	0.70±5% (1000Ω)	0.70±5% (1000Ω)	0.70±5% (1000Ω)	0.56±5% (1000Ω)	0.57±5% (1500Ω)
Distortion	< 0.2	< 0.2	< 0.2	< 0.2	< 0.2
Max.Motion	1.5	1.5	1.5	1.5	1.5
Moving Mass	11	11	11	11	8.2
Dimensions	25.4×34	25.4×34	25.4×34	27×34	27×34
Temperature Range	-40--+70	-40--+70	-40--+70	-40--+70	-40--+70
Warranty Period	3	3	3	3	3
Case Type