Reinforced geophone 8Hz (ST-8N) is designed equivalent to SM-4 structure, which is for low weight, long field-life,and ultra reliable performance. Precision engineered components and computerized test equipment ensure consistency in manufacture and operation throughout and beyond the limited replacement guarantee period of three years.
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(Equivalent to SM-4, 8Hz)
(Equivalent to GS-20DX,8Hz)
|Natural frequency ( Hz )||8 ± 5%||8±5%|
|Open circuit damping||0.337||0.38|
|Damping with calibration shunt||0.6 ± 5%||0.71±5%|
|Calibration shunt resistance(ohms)||2400||1740|
|Open circuit sensitivity (v/m/s)||28.8±5%||28.0±5%|
|Sensitivity with calibration shunt(v/m/s)||24.9±5%||23.0±5%|
|Coil Resistance (ohms)||375 ± 5%||395±5%|
|Harmonic Distortion ( % )||＜0.2||≤0.2|
|Typical Spurious Frequency ( Hz )||≧240||≥180|
|Moving Mass ( g )||11.3||11.0|
|Max. coil excursion p-p (mm)||2.0||1.5|
|Max. tilt angle||20º||20º|
|Element Diameter (mm)||25.4||25.4|
|Element Height (mm)||32||33.5|
|Element Weight (g)||74g||87.0|
|Operating Temperature(℃)||-40℃ to + 100℃||-40℃ to + 100℃|
|Warranty Period||3 years||3 years|
|● All parameters specified herein are rated at a temperature 20℃±2℃.
● 3-year limited warranty on basic element exclusive of high voltage, lightening or physical abuse.
– Other type of geophones are also available: SM-4 Equivalent, SM-6 Equivalent, SM-24 Equivalent, SG10 Equivalent, GS-20DX Equivalent, GS-32CT Equivalent, GS ONE Equivalent, 1Hz, 2Hz, 2.5Hz, 3Hz, 4Hz, 4.5Hz, 5Hz,8Hz, 10Hz, 14Hz, 15Hz, 28Hz, 30Hz, 38Hz, 40Hz, 60Hz,80Hz and 100Hz.