Guralp-systems CMG-3ESPCD Manuel d'utilisateur télécharger pdf (Page 38)

CMG-3ESPCD Digital Broadband Seismometer Calibrating the 3ESPCD

3. Repeat this measurement for several tilt angles.

4. For the vertical sensor, the input acceleration is given by

a = g sin φ

whilst for the horizontal sensor, it is

a = g ( 1 – cos )φ

Calculate the input acceleration for each of the tilt angles used, and

plot a graph of mass position output against input acceleration.

5. The gradient of the line obtained gives the sensitivity of the coil (in

V/ms

-2

, if g was measured in ms

-2

and the mass position in V.)

6. The coil constant K is equal to this sensitivity divided by the value of

the displacement feedback resistor, given on the calibration sheet.

MAN-C3E-0002 38 Issue B - November 2013

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 97 98

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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