Guralp Systems CMG-3TB - Manual (Page 3)

Operator's guide
Installing the Scream! extension....................................................................... 47
Installing the reference instrument................................................................... 47
Measuring the orientation.................................................................................. 48
Applying automatic rotation.............................................................................. 53
4 Calibrating the 3TB................................................................................................. 55
4.1 The calibration pack......................................................................................... 55
Poles and zeroes................................................................................................. 56
Frequency response curves................................................................................ 57
Obtaining copies of the calibration pack........................................................... 57
4.2 Calibration methods......................................................................................... 58
4.3 Calibration with Scream! ................................................................................ 58
Sensor response codes........................................................................................ 62
4.4 Calibration with a handheld control unit........................................................ 62
4.5 The coil constant.............................................................................................. 63
5 Inside the 3TB......................................................................................................... 64
5.1 The sensors....................................................................................................... 64
5.2 The control system........................................................................................... 66
LOCK .................................................................................................................. 66
UNLOCK ............................................................................................................ 67
CENTRE ............................................................................................................. 69
5.3 The feedback system........................................................................................ 70
Hybrid feedback................................................................................................. 71
Conventional-response feedback....................................................................... 72
Comparisons....................................................................................................... 72
6 Connector pinouts................................................................................................... 74
7 Specifications.......................................................................................................... 76
8 Revision history...................................................................................................... 78
November 2006 3