Guralp Systems CMG-6T - Manual (Page 2)

CMG-6T
Table of Contents
1 Introduction..............................................................................................................3
1.1 Response options...............................................................................................4
2 First Encounters........................................................................................................5
2.1 Handling notes...................................................................................................5
2.2 Unpacking..........................................................................................................5
2.2.1 Serial number.............................................................................................6
2.3 Connection......................................................................................................... 6
2.3.1 The breakout box........................................................................................6
2.3.2 The hand-held control unit (HCU)............................................................7
2.4 Centring (zeroing) the instrument.....................................................................8
2.4.1 Remote centring option..............................................................................9
2.5 Test installation.................................................................................................9
2.6 Installation notes.............................................................................................11
2.7 Installing in vaults...........................................................................................12
2.8 Installing in pits...............................................................................................15
2.9 Other installation methods..............................................................................18
3 Calibrating the CMG-6T.........................................................................................20
3.1 The calibration pack........................................................................................20
3.2 Poles and zeroes...............................................................................................21
3.3 Frequency response curves.............................................................................22
3.4 Obtaining copies of the calibration pack........................................................22
3.5 Calibration methods........................................................................................23
3.6 Noise calibration with Scream! ......................................................................23
3.6.1 Sensor response codes.............................................................................26
3.7 The coil constant.............................................................................................27
4 Connector pin-outs.................................................................................................28
4.1 Instrument, HCU RECORDER and SENSOR connectors...............................28
4.2 Breakout box and HCU power connector.......................................................29
5 Specifications......................................................................................................... 30
6 Revision history......................................................................................................31
2 Issue B