| SMC-1850 Specifications |
| Natural
Frequency (Fn) ± 5% |
|
10.0 Hz |
14.0 Hz |
30.0 Hz (Horz.) |
| Coil Resistance ± 5% |
1850 ohms |
| Intrinsic Sensitivity ± 5% |
.402 V/cm/sec (1.02 V/in/sec) |
| Open Circuit Damping ± 10% |
|
.70 |
.50 |
.22 |
| Total Harmonic Distortion |
Less than 1% at 12 Hz or natural frequency whichever is
larger |
| Operating Position |
|
Vert — Horz
20° —
5° |
Vert — Horz
30° —
10° |
Vert to Horz
180° |
| Maximum Tilt Within Specifications |
| Temperature Limits |
-40°F to 392°F (-40°C to 200°C) |
|
Note: For testing on SMT-200
Geophone Tester, the frequency, resistance and damping tolerances entered must
be 1% greater than the published specification above. Sensitivity tolerance
entered must be 2% greater than the published specification.
All
specifications apply to measurements made after a heat cycle of 200°C and
after unit returns to room temperature (25°C). Units will operate at larger
tilt angles, but performance will not necessarily meet specifications. Note:
The SMC-1850 is NOT hermetically sealed.
| Maximum
Coil Excursion: |
0.12 in P-P (3.0 mm
P-P) |
| Suspended Mass: |
0.23 oz. (6.6
g) |
| Dimensions: |
Diameter: 0.875 in (22.2 mm)
Height: 1.04 in (26.4mm)
Weight: 1.52 oz. (43g) |
Click HERE to load chart for Seismic Detector Response Curve
Output VS. Frequency (SMC-1850 @ 10 Hz & SMC-1850 @ 14 Hz). (Warning: 115
KBytes)
Specifications are subject to change without
notice. 
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All units tested
at 200° C
The SMC-1850 High Temperature Geophone has been tested at 200°C
for more than 300 hours with no loss in performance specifications. Its design
structure and super strength magnetic field makes the output of this small
geophone equal to or greater than the output of larger units. Rotating dual
coil construction withstands severe shocks and rough handling. The patented PCB
header provides easy and reliable electrical connections.