Guralp Systems CMG-40T - Manual (Page 2)

CMG-40T
Table of Contents
1 Introduction............................................................................................................................4
1.1 Response options..............................................................................................................5
2 First encounters......................................................................................................................6
2.1 Handling notes..................................................................................................................6
2.2 Connections......................................................................................................................6
The breakout box...............................................................................................................6
The handheld control unit..................................................................................................7
Signal meter..................................................................................................................8
Calibration.....................................................................................................................9
Control commands........................................................................................................9
Banana plugs.................................................................................................................9
2.3 Zeroing the instrument.....................................................................................................9
Adjusting the mass position offsets manually...................................................................9
Adjusting the mass position offsets with a Handheld Control Unit................................11
Zeroing a 40TD digital instrument..................................................................................11
2.4 Installation notes.............................................................................................................14
3 Installing the 40T.................................................................................................................16
3.1 Installing in vaults..........................................................................................................16
Choosing a location.........................................................................................................16
Temperature stability.......................................................................................................17
Other considerations........................................................................................................18
3.2 Installing in pits..............................................................................................................19
Other installation methods...............................................................................................21
4 Calibrating the 40T..............................................................................................................23
4.1 The calibration pack.......................................................................................................23
Poles and zeroes...............................................................................................................24
Frequency response curves..............................................................................................25
Obtaining copies of the calibration pack.........................................................................25
4.2 Calibration methods.......................................................................................................26
4.3 Calibration with Scream! ...............................................................................................26
Sensor response codes.....................................................................................................30
4.4 Calibration with a handheld control unit........................................................................30
4.5 The coil constant............................................................................................................31
Appendix A Connector pinouts.............................................................................................32
2 Issue A