ART 3.0 - Güralp Systems Ltd
ART 3.0 - Güralp Systems Ltd
ART 3.0 - Güralp Systems Ltd
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<strong>ART</strong><br />
Sensor<br />
CMG-3TB or 3V / 3ESP borehole,<br />
360 s – 50 Hz response<br />
Sensor type code<br />
(response-type)<br />
CMG3B_360S_100HZ<br />
Units<br />
(V/A)<br />
V<br />
Some English descriptions are also accepted, e.g.<br />
“120s velocity”, “100Hz acceleration”.<br />
• To set the sensitivities (or gains) of the sensor<br />
components, include the line<br />
G=verticalsens,N/Ssens,E/Wsens<br />
These values are given on the sensor calibration sheet. For<br />
velocity sensors, they are given in units of V m –1 s (V/m/s).<br />
The gain of an accelerometer is expressed in V m -1 s 2 (V/m/<br />
s 2 ). Because <strong>Güralp</strong> <strong>Systems</strong> sensors and digitizers use<br />
differential inputs and outputs, the sensitivity is quoted as<br />
2 × (single-ended sensitivity) on the calibration sheet.<br />
• To set the coil constants of the sensor components,<br />
include the line<br />
COILCONST=ZCC,NCC,ECC<br />
Where ZCC is the vertical coil constant, NCC is the<br />
North/South coil constant and ECC is the East/West cost<br />
constant. These values are given on the sensor calibration<br />
sheet.<br />
• To set the local acceleration due to gravity, include the<br />
line<br />
GRAVITY=acceleration<br />
You should give this value in m s –2 , if you know it. If you<br />
miss out this line, Scream! will use a standard average<br />
g value of 9.80665 m s –2 .<br />
2.2.1 Examples<br />
The calibration information for a CMG-3T weak-motion velocity<br />
sensor might look like the following:<br />
[GURALP-CMG3]<br />
Serial-Nos=T3X99<br />
VPC=3.153,3.147,3.159<br />
G=1010,1007,1002<br />
10 Issue C