Vertical geophone 28 Hz with 1 mt cable, double clip connector or split spring (single clamp) available upon request.","- DATA SHEET -","Frequency Natural frequency (fn): 28 Hz Tolerance: +\/- 5 Hz Max. Fn specific inclination angle: 90 ° Typical spurious frequency:> 380 Hz","Distortion Distortion with coil 0.7 in \/ s p.p. coil to case velocity: <0.2% Distortion of frequency measurement: 40Hz Max. specific distortion angle: 90 °","Damping Open circuit typical damping: 00:37 Damping with 1500 Ohm shunt resistance: 0.576 Tolerance: +\/- 5%","Coil resistance","Standard: 395 ohms Tolerance: +\/- 5%","Sensibility","Inherent open circuit voltage sensitivity : 42 V \/ m \/ s Sensitivity with 1500 Ohm shunt resistance: 30.4 V \/ m \/ s Tolerance: +\/- 5%","Physical characteristics Moving mass: 8.2 g Max. coil Excursion p.p.: 1.5 mm Diameter: 27 mm Height: 33.3 mm Weight: 95 g Operating temperature range: -40 ° C to + 100 ° C