&GS-32CT
 |
 |
GS-30CT
Close Tolerance Geophone
 The GS-30CT represents the ultimate refinement in
geophone design to
date. This new geophone is
offering heretofore unattainable
geophone-to-geophone
uniformity, distortion reduced by a factor of 2.5 and
tighter tolerance
on geophone parameters:
New standard ±
2%
Channel-to-channel uniformity and elimination of
self-generated
noise and distortion is the essence of
seismic data.
Towards this end, the performance of the
GS-30CT is clearly unsurpassed. It is a
field-proven
match for the most advanced 24-bit Data
Acquisition
Systems.
3
Year Warranty
|
| GS-30CT Specifications |
| Specifications calculated at 25°C. Orientation is Vertical
to 20°. Maintains all specifications at Vertical to 20° tilt.
Exception: Harmonic Distortion at 12 Hz (Vertical only). |
|
|
|
| Frequency |
|
|
| Natural
Frequency (Fn): |
|
10 Hz
± 2% |
| Typical
Spurious Frequency: |
|
> 160
Hz |
|
|
|
| Resistance |
|
|
| Standard Coil Resistance: |
|
395 ohms
± 2% |
|
|
|
| Distortion |
|
|
| Harmonic distortion with coil to case
velocity of 0.7 in/sec (1.8 cm/sec) @ 12 Hz and coil to case displacement of
0.0093 in (0.0236 cm) P-P @ 12 Hz |
|
<0.08% |
| With coil to case displacement of
0.0093 in (0.0236 cm) P-P @ 12 Hz |
|
<0.12% |
|
|
|
| Sensitivity |
|
|
| Intrinsic Voltage Sensitivity
(G): |
|
.698 V/in/s,
.275 V/cm/s |
| Sensitivity @
70% Damping |
|
.500
V/in/sec) |
 |
|
(.197
V/cm/sec)± 2% |
| Normalized
Transduction Constant: |
|
.0351 sq.root
of DCR; V/in/s .0138; sq.root of DCR; V/cm/s |
|
|
|
| Damping |
|
|
| Open Circuit Damping (Bo) |
|
.316
|
| Shunt
Resistance for Damping Calibration for 395 ohm coil: |
|
60% damping
± 2%: 1500 ohms |
|
|
70% damping
± 2%: 1000 ohms |
| Damping
Constant (BcRt) |
|
536 |
|
|
|
| Physical Specifications |
|
|
| Moving Mass
(M) |
|
.395 oz.,
11.2 g ± 2% |
| Case to Coil
Motion P-P: |
|
.060 in (.152
cm) |
| Operating and
Storage Temperature: |
|
-45°C to
+100°C |
| Dimensions
(less terminals*) |
|
|
| Height |
|
1.30 in (3.30
cm) |
| Diameter |
|
1.00 in (2.54
cm) |
| Weight |
|
3.03 oz (86
g) |
| * terminal height is .16 in (.41
cm) |
|
|
|
|
|
| Cases Available: |
|
|
| PC-801-LP
Land Case |
|
|
| PC-801-LPC
Land Case |
|
|
| PC-901-LP
Marsh Case |
|
|
|
|
|
| Specifications are subject to change
without notice. |
|
|
Click HERE to load chart for Seismic Detector Response Curve
Output VS. Frequency.
(115 KBytes) 
| GS-32CT
Geophone |
 |
|
Close Tolerance
High Spurious Geophone
| » |
Spurious response greater than 250 Hz for extended clean band
width |
| » |
Full
compatibility with GS-20DX and GS-30CT geophones |
| » |
Typical string distortion less than .03% (12 series, damped
.70) |
| » |
High
sensitivity option available
|
| » |
3-Year Warranty |
|
| GS-32CT Specifications |
| Maintains all specifications at vertical to 20° tilt with the
following exception: Harmonic distortion at 12 Hz (vertical to 10°
tilt). |
|
|
|
| Description |
Specification @ 25° C |
TOL ± |
| Natural
Frequency (Fn): |
10
Hz |
2.5% |
|
|
|
| Coil
Excursion P-P |
> .040 in,
> .102 cm MIN |
|
|
> .060 in,
> .152 cm MAX |
|
|
|
|
| Clean Band
Pass (Spurious Response) |
> 250 Hz
(Typical) |
|
|
|
|
| DC Resistance
(DCR) |
395
ohms |
2.5% |
|
|
|
| Intrinsic
Voltage Sensitivity (G) |
.698 V/i/s,
.275 V/cm/s |
|
|
|
|
| Open Circuit
Damping (Bo) |
.316 |
|
|
|
|
| Damping
w/1000 ohm Shunt |
.70 |
2.5% |
|
|
|
| Sensitivity @
70% Damping |
.500 V/in.s,
.197 V/cm/s |
2.5% |
|
|
|
| Moving Mass
(M) |
.395 oz.,
11.2 g |
2.5% |
|
|
|
| Harmonic
Distortion |
|
|
| With coil to
case velocity of 0.7 in/sec (1.8 cm/sec) P-P @ 12 Hz |
<0.10% |
|
| String, 12
series, damped 0.70 |
<0.03%
(Typical) |
|
|
|
|
| With coil to
case displacement of 0.0093 in (0.0236 cm) P-P @ 10 Hz |
<0.20% |
|
|
|
|
| Dimensions |
|
|
| Weight |
3.03 oz., 86
g |
|
| Diameter |
1.00 in.,
2.54 cm |
|
| Height (less stud & terminals) |
1.30 in.,
3.30 cm |
|
|
|
|
| Specifications are subject to change
without notice. |
|
|
Click HERE to load chart for Seismic Detector Response Curve
Output VS. Frequency.
(115 KBytes)
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