Elekta Neuromag NM21283A Manual de usuario

Sensor Tuner

User’s Guide

Software Version 3.0 for

Elekta Neuromag

March 2005

NM21283A-A

This document contains copyrighted and possibly conﬁdential information and is intended for the exclusive use of

customers having Neuromag products and authorized representatives of Elekta Neuromag Oy. Disclosure to others or

other use is strictly prohibited without the express written authorization of Elekta Neuromag Oy.

Elekta Neuromag Oy reserves the right to make changes in the speciﬁcations or data shown herein at any time with-

out notice or obligation.

Elekta Neuromag Oy makes no warranty of any kind with regard to this document and the related software, including

but not limited to, the implied warranties of merchantability and ﬁtness for a particular purpose. Elekta Neuromag Oy

shall not be liable for errors contained herein or direct, indirect, incidental or consequential damages in connection

with the furnishing, performance, or use of this material and software.

Elekta Neuromag, Vectorview and Neuromag System are trade marks of Elekta Neuromag Oy, UNIX is a trademark

of UNIX System Laboratories, Inc., and Motif is a trademark of Open Software Foundation, Inc.

Editor: Matti Kajola

Printed in Finland.

Printing History Neuromag p/n Software Date

1st edition NM21283A tune_vv 3.0.x 2001-12-27

2st edition NM21283A-A tune_vv 3.0.x 2005-03-13

0537

NM21283A-A i

Contents

Introduction 1

Part 1 Basic Usage

Chapter 1 User interface basics 5

1.1 Using menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Using text fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Using file selection boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chapter 2 Getting started 9

2.1 Beginning a session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 Using online HELP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3 Ending a session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Chapter 3 Basic tuning operations 11

3.1 Measuring the sensor noise level . . . . . . . . . . . . . . . . . . . . . 11

3.2 Fine tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.3 Resetting channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.4 Heating sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.5 About saving and loading settings . . . . . . . . . . . . . . . . . . . . 14

3.6 Noise display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Chapter 4 Troubleshooting 17

4.1 Basic checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4.2 Viewing noise history of a channel . . . . . . . . . . . . . . . . . . . . 17

4.3 Tuning selected channels . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Chapter 5 Description of the menus 21

5.1 File Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.2 Parameters Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.3 Commands Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.4 Search Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5.5 View Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

5.6 Help Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

ii NM21283A-A

Part 2 Sensor operation principles

Chapter 6 Principles of SQUID operation 27

6.1 Operation of a SQUID magnetometer . . . . . . . . . . . . . . . . . . 27

6.2 SQUID electronics of Vectorview . . . . . . . . . . . . . . . . . . . . . . 29

6.3 Optimal point of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Chapter 7 Manual tuning 33

7.1 Need for manual tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.2 Tools for manual tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.3 Measuring flux to current curves using Squiddler . . . . . . . . 34

7.4 Measuring flux to current curves using Tuner . . . . . . . . . . . 34

7.5 Measuring noise level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7.6 Manual tuning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

7.7 Typical sensor problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Part 3 Advanced features

Chapter 8 Basic measurements 43

8.1 Setting the expert level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8.2 Selecting and running jobs . . . . . . . . . . . . . . . . . . . . . . . . . . 44

8.3 Measurement parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

8.4 View modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

8.5 I-Phi measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

8.6 Noise measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

8.7 FFT measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

8.8 Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Chapter 9 Tuning procedures 51

9.1 Noise level based tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

9.2 Tuning based on characteristics . . . . . . . . . . . . . . . . . . . . . . 52

9.3 Manual tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Chapter 10 Measuring characteristics 53

10.1 Operating point parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 53

10.2 Measuring derivative information . . . . . . . . . . . . . . . . . . . . . 54

10.3 Measuring and using current-voltage characteristics . . . . . 54

10.4 Measuring gate curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Chapter 11 Miscellaneous 56

11.1 Searching channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

NM21283A-A iii

11.2 Loading and saving in special cases . . . . . . . . . . . . . . . . . . 56

11.3 Marking broken channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

11.4 Reverting operating points . . . . . . . . . . . . . . . . . . . . . . . . . . 57

11.5 Creating start-up files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

11.6 Updating the power-up settings . . . . . . . . . . . . . . . . . . . . . . 58

11.7 Synchronizing Janitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

11.8 Using SSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Chapter 12 Description of the menus 61

12.1 File Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

12.2 Job Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

12.3 Parameters Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

12.4 Commands Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

12.5 Search Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

12.6 View Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

12.7 Help Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Appendix A Command line options 68

Appendix B Parameters 69

Appendix C Revision history 76

iv NM21283A-A

NM21283A-A 1

Introduction

This manual has two functions. It is at the same time the user’s manual of

the sensor tuning program and also a manual describing the operation

principles of Vectorview™ sensor hardware. Detailed descriptions about

the SQUID sensor system, electronics, and tuning principles, are given in

addition to the description of the tuning program.

The SQUID tuner program tune_vv, is a versatile tool that can be used in

maintenance of Vectorview™ measurement system. It facilitates the tun-

ing and monitoring of the performance of the sensor electronics.

The key features provided by the program are:

• Measuring white noise level.

• Automatic ﬁne tuning of the noise level.

• Adjusting sensor operating point manually.

• Measuring several characteristic curves of the sensors.

• Manual heating of single or all sensors.

The functionality of the program depends on the expert level being used.

The lowest level 0 allows noise measurements and automatic ﬁne tuning

of the system. The expert level 1 allows more complicated measurements

and setting of various parameters affecting the program. Using the fea-

tures in level 1 requires understanding of the operation of the sensor sys-

tem, and is intended to be used by service personnel.

This manual is divided in three parts. The ﬁrst one describes how to tune

the system automatically using the SQUID tuning program. This is a

everyday operation, and reading of this part is recommended for all users.

All expert level 0 operations are explained.

The second part explains the operating principles of a SQUID sensor and

electronics. It also contains a detailed description how the sensors are

tuned manually. This information is essential for the maintenance person-

nel and for understanding advanced features of the tuning program.

The third part describes advanced features of the tuning program. These

are available when the expert level is set to 1, and are normally used only

by the maintenance personnel.

2 NM21283A-A

NM21283A-A 3

PART 1

Basic Usage

This part describes the basic usage of the SQUID tuning program. It

contains information about the functionality available in the lowest

expert level 0. This allows measuring white noise level of all channels

and automatic ﬁne tuning. Reading of this part is recommended for all

users of a Vectorview system.

4 NM21283A-A

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