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Specification<br />
<strong>GURALP</strong> <strong>CMG</strong>-<strong>6T</strong><br />
BROADBAND SEISMOMETER<br />
Capacitive displacement feedback<br />
Three-component differential velocity outputs<br />
Short-period response to 50 Hz<br />
Long-period response to 1, 10, 30, or 60 sec<br />
Mass clamp not required<br />
Mass centering not required<br />
DC-offset adjustment icluded<br />
" Breakout Box and Handheld Control Unit<br />
available<br />
" A 24-bit digitizer module (<strong>CMG</strong>-DM24) and<br />
a portable storage/acquisition module (<strong>CMG</strong>-<br />
SAM) are available<br />
The Guralp <strong>CMG</strong>-<strong>6T</strong> three-component<br />
broadband seismometer provides high dynamic<br />
range broadband velocity response for a variety<br />
of applications.<br />
The standard frequency band is 30 sec to 50 Hz.<br />
While the <strong>CMG</strong>-6 noise floor is higher than that<br />
of the <strong>CMG</strong>-3ESP and <strong>CMG</strong>-3T sensors, the<br />
moderate price makes the instrument an<br />
attractive selection for several applications:<br />
" Portable and rapid array mobilizations in<br />
which reliability, low power, and installation<br />
simplicity are important<br />
" Permanent installation at sites which do not<br />
have seismic background close to the USGS<br />
Low Noise Model<br />
" Short to medium term installations in which<br />
vault temperature and tilt are not as well<br />
controlled as for permanant sites<br />
Distributor: Digital Technology Associates, Inc.<br />
1330-A Galaxy Way, Concord, CA 94520 USA<br />
Tel: (925) 682-2508 Fax: (925) 682-2072<br />
dta_pauly@compuserve.com<br />
Manufacturer: Guralp Systems Limited, 3 Midas House<br />
Calleva Park, Aldermaston, RG7 8EA, England<br />
Tel: 44-118-9819056 Fax: 44-118-9819943<br />
sales@guralp.com<br />
www.guralp.com<br />
10 Feb 01<br />
Page 1<br />
<strong>CMG</strong>-<strong>6T</strong>
<strong>CMG</strong>-<strong>6T</strong> SPECIFICATIONS<br />
Outputs and Response<br />
Standard velocity output:<br />
Optional high-gain output:<br />
Standard frequency band:<br />
Optional frequency bands:<br />
Peak output:<br />
Clip level and self noise:<br />
20 V dc differential velocity = 2x2000 V/m/s for 30 sec sensor<br />
10 Vdc mass position output = 20 V/m/s2 for 30 sec sensor<br />
8000 V/m/s<br />
0.033 (30 sec) to 50 Hz<br />
0.100 (10 sec) to 50 Hz<br />
0.016 (60 sec) to 50 Hz<br />
±10 V (20 V p-p) standard<br />
±4.5 V (9 V p-p) optional<br />
See figure on page 1. The chart noise levels are peak-to-peak<br />
estimates, in m/s2, equal to six times the measured RMS acceleration<br />
values for a 1/3 octave bandwidth. The USGS Low Noise Model (LNM)<br />
is a composite from the best stations in the world at their quietest. The<br />
High Noise Model (HNM) represents the noisy sites at their best.<br />
Controls<br />
External calibration enable & input: Directly to the sensor connector<br />
DC null adjustment:<br />
Screw adjustment thru case<br />
Optional remote DC adjustment: Remote operation via dc motors<br />
Power THREE COMPONENTS SINGLE COMPONENT<br />
For standard (10 V) output: ±26 mA @ ±12 Vdc or<br />
+65 mA @ +12 Vdc<br />
For optional (4.5 V) output: +20 mA @ +5 Vdc<br />
For 60 sec output add:<br />
22 mA @ +12 Vdc<br />
Physical<br />
Case diameter: 6.625”<br />
Case height: 8”<br />
O-ring seals:<br />
In lid, base, and portholes<br />
Carrying handle:<br />
On top cap<br />
Cable connection:<br />
Multipin connector on top cap<br />
Lowest spurious resonance: 400Hz<br />
Operating temperature range: -10 to +65 deg C<br />
Temperature sensitivity:<br />
< 0.6 V/10 deg C<br />
Pressure jacket & cap material: Aluminum<br />
Weight:<br />
18lbs (6 kg)<br />
Single-component Specifications (models <strong>CMG</strong>-6V and <strong>CMG</strong>-6H)<br />
Case diameter and height: 3.25” diameter, 6.5" height<br />
Cable:<br />
Glass-sealed in base, 1m with connector<br />
Weight:<br />
3 lbs<br />
Options, Accessories, & Reference Data<br />
Refer to separate document for Handheld Control Unit, Passcal UniversalBreakout Box, and sensor noise<br />
information. Refer to separate documents for digitizer and storage module information.<br />
Downhole Accessories<br />
Refer to separate brochure, ‘Guralp Broadband Downhole Systems’<br />
Distributor: Digital Technology Associates, Inc.<br />
1330-A Galaxy Way, Concord, CA 94520 USA<br />
Tel: (925) 682-2508 Fax: (925) 682-2072<br />
dta_pauly@compuserve.com<br />
Manufacturer: Guralp Systems Limited, 3 Midas House<br />
Calleva Park, Aldermaston, RG7 8EA, England<br />
Tel: 44-118-9819056 Fax: 44-118-9819943<br />
sales@guralp.com<br />
www.guralp.com<br />
10 Feb 01<br />
Page 1<br />
<strong>CMG</strong>-<strong>6T</strong>