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4.5 Levelling and Centring.............................................................................................40
4.6 Down-hole orientation..............................................................................................41
4.6.1 Installing the Scream! extension......................................................................42
4.6.2 Installing the reference instrument...................................................................42
4.6.3 Measuring the orientation................................................................................42
4.6.4 Applying automatic rotation..............................................................................48
5 Calibrating the 3TB.......................................................................................................51
5.1 The cali ration pack................................................................................................51
5.1.1 Poles and zeroes.............................................................................................51
5.1.2 Frequency response curves.............................................................................53
5.1.3 O taining copies of the cali ration pack..........................................................54
5.2 Cali ration methods.................................................................................................54
5.3 Cali ration with Scream!..........................................................................................55
5.3.1 Sensor response codes for 3TB instruments..................................................58
5.4 Cali ration with a hand-held control unit.................................................................58
5.5 The coil constant.....................................................................................................58
Inside the 3TB............................................................................................................... 0
6.1 The sensors............................................................................................................. 0
6.2 The control system.................................................................................................. 1
6.2.1 LOCK................................................................................................................ 2
6.2.2 UNLOCK........................................................................................................... 3
6.2.3 CENTRE........................................................................................................... 5
6.3 The feed ack system..............................................................................................
6.3.1 Hy rid feed ack............................................................................................... 7
6.3.2 Conventional-response feed ack.................................................................... 8
6.3.3 Comparisons.................................................................................................... 8
7 Connector pin-outs.......................................................................................................70
7.1 Break-out Box – Power connector..........................................................................70
7.2 Break-out Box – Recorder and Control connectors................................................71
7.3 Break-out Box – Sensor connector.........................................................................72
7.4 Instrument - Sensor Connector...............................................................................73
8 Specifications................................................................................................................74
9 Revision history............................................................................................................7
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