Guralp-systems CMG-3ESPCD Manuel d'utilisateur télécharger pdf (Page 85)

CMG-3ESPCD Digital Broadband Seismometer Inside the 3ESPCD

7.2 Inside the DM24

7.2.1 Architecture

Internally, DM24 digitisers are structured as shown in the following diagram.

The system is designed around a low power, high performance ARM

microprocessor. This is a 32-bit processor with a large address space for data

storage and manipulation. It also includes many integrated functions such as

multiple timers and serial I/O ports. In addition, the system contains a Cirrus

Logic CS5376 digital filtering chip-set and TMS320VC33 digital signal

processor (DSP). The CS5376 provides data to the DSP at 2,000 samples per

MAN-C3E-0002 85 Issue B - November 2013

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CMG-3ESPCD 1
Table of Contents 2
1 Preliminary Notes 5
2 Introduction 6
2.1 Sensor response 7
3 Installing the 3ESPCD 8
3.1.4 Connections 9
3.1.5 FireWire 9
3.2 Installation notes 10
3.3 Installing in vaults 11
3.4 Installing in pits 14
3.6 Rapid installation 17
3.6.1 Deployment 18
3.6.2 Recovery 21
3.7 Installing in post-holes 22
3.8 Using the 3ESPCD 23
3.8.2 Reading digitiser disks 24
4 Calibrating the 3ESPCD 28
4.2 Calibration methods 32
4.3 Calibration with Scream! 33
4.4 The coil constant 37
5 Using Scream! 39
5.1.1 System ID 40
5.1.2 Output control 41
5.1.3 Triggering 44
5.1.3.1 STA/LTA 45
5.1.3.2 Level 50
5.1.3.3 External triggering 50
5.1.4 Mux Channels 51
5.1.5 Ports 51
5.2 Controlling digitisers 53
5.2.2 Triggering 54
5.2.3 Calibration 54
5.2.4 Mass Control 54
5.2.5 Data flow 55
5.2.5.1 DIRECT 56
5.2.5.2 FILING 56
5.2.5.3 Heartbeat messages 56
5.2.5.5 ADAPTIVE 58
5.2.5.6 DUAL 58
5.2.5.7 RE-USE / RECYCLE 59
5.2.5.8 WRITE-ONCE 59
6 Command line interface 60
6.2 General configuration 61
6.2.4 BAUD 62
6.2.5 AZIMUTH 62
6.3 Output configuration 63
6.3.2 CONTINUOUS 64
6.3.3 SET-TAPS 64
6.4 Triggering 65
6.4.4 LTA 66
6.4.5 RATIOS 66
6.4.6 PRE-TRIG 66
6.4.7 POST-TRIG 66
6.5 Calibration 67
6.5.2 SQUAREWAVE 68
6.5.3 RANDOMCAL 68
6.5.4 MINUTE 69
6.6 Actions 70
6.6.4 RE-BOOT 71
6.7.1 SHOW-FLASH 71
6.7.2 DIRECT 72
6.7.3 FILING 72
6.7.4 ADAPTIVE 72
6.7.5 FIFO 72
6.7.6 DOWNLOAD 73
6.7.7 ALL-FLASH 73
6.7.8 ALL-DATA 73
6.7.9 STREAM 73
6.7.10 STATUS-ONLY 74
6.7.11 S/S 74
6.7.12 ALL-TIMES 74
6.7.13 FROM-TIME 74
6.7.14 TO-TIME 74
6.7.15 GO 75
6.7.16 END-DOWNLOAD 75
6.7.17 DISKMENU 75
6.7.18 MBTRANSFER 76
6.7.19 ERASEFILE 76
7 Inside the 3ESPCD 77
7.1.2.1 LOCK 78
7.1.2.2 UNLOCK 79
7.1.2.3 CENTRE 80
7.1.3 The feedback system 81
7.1.3.1 Hybrid feedback 82
7.1.3.3 Comparisons 84
7.2 Inside the DM24 85
7.2.2.2 from the command line 87
7.2.3.2 Loading new DSP code 89
8.1 GPS port 90
8.2 DATA OUT port 92
8.3 FIREWIRE port 93
11 Revision History 98

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