Magnetometer.pdf

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

Objective: Build Magnetometer ..............................2

First Break Down ...................................................2

Second Break Down ..............................................2

1 Filter module ...................................................2

Appendix ................................................................4

Amplifier Module Schematic ..............................4

Post Amplifier Module Schematic and Test

Circuit...................................................................5

Filter Module Schematic and Test Circuit .........6

Magnetometer Amplifier Module........................7

Magnetometer Filter Module ..............................8

Filter Pin-out ........................................................9

Post Amplifier Pin-out....................................... 10

Amplifier Pin-out ............................................... 11

Objective: Build Magnetometer

Step 1: Start with an objective. I always believe you start at the top, so you keep

a focus on what you are trying to do.

Step 2:Break the objective down to handlable tasks

First Break Down

1.

Hardware

2.

Software

3.

implementation

Second Break Down

Start with the hardware part of the objective and break it down into components.

1.

Filter module

2.

Coils

3.

Amplifier module

4.

A/D Card

5.

Cable and interconnection

1. Filter module

To build the filter module we first need to understand the schematic.

The schematic acts like a set of instructions. It gives you a list of parts and

instructions on how to connect them.

Skills you will need:

1.

Ability to read a schematic (See Filter module schematic)

2.

Ability to read the part pin-outs

3.

Ability to use a multimeter

4.

Understanding of components

What makes this schematic more difficult to read is that some of the parts are

interconnected on modules. You will need to compare the schematics of the

individual modules with the overall schematic.

After you study this, you will find that you are interconnecting 4 different parts.

1.

Post amplifier module (Quantity of 2)

2.

Filter Module (Quantity of 4)

3.

10k Resistor (optional) (Quantity of 2)

4.

9-volt Battery (Quantity of 2)

At this point you could simply build the filter module from the schematic. Even if a

student can build the filter module from the schematic it doesn’t mean that he

understands the components. If you don’t have any idea how the components

function then debugging the module after it is together can be very difficult.

Let’s take one final step of testing the electrical parts of the filter module before

using them.

Let’s look at the Post Amplifier Module Schematic and Test Circuit,

Post Amplifier pin-out .

Get the components shown in the schematic and place them on the module

as shown on the pinout. Make sure you understand the physical difference

between the post amplifier module and the filter module, and make sure the

module is in the correct orientation when you place on the components,

especially the terminal blocks.

Once you have placed all the parts on the module, take a copy of the Post

Amplifier Module Schematic and ohm out some or all of the connection.

Ohming out just a few of the connections verifies that you have the right module

in the correct orientation.

Once you have an assembled module place it on the springboard and

connect it as shown in the Test Circuit Post Amplifier.

The post amplifier multiplies the input voltage by the gain to get the output

voltage. The gain is determined by R2/R1 10k/5k= 2 . So in an Ideal world, if the

input voltage is 4.5 Volts the output voltage would be 9 Volts. Because the

operational amplifier is powered by 9 volts, it can’t reach this limit. If you had 1.5

Volts on the input you would get close to 3 Volts on the output.

Appendix

Amplifier Module Schematic

AMPLIFIER MODULE SCHEMATIC

9V

+9Volts

RED1

10k 40%

C1

.22uF

-9V

R3

YELLOW1

R4

1.24k

R8

L1

16

R 2k

GREEN1

OUTPUT

1 13

R7

100

BLUE1

U1

10

L3

C4

output

INA103

GREEN2

1 6

2

R5

100

L2

R9

R2

2k

1

YELLOW2

-9Volts

C2

.22uF

R8,L1,L2,R9=Short

C4=Open

BLACK1

C3

.22uF

R6

1.24k

-9V

GREEN3

GREEN4

Ground

Nov.26 2001

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Post Amplifier Module Schematic and Test Circuit

POST AMPLIFIER MODULE SCHEMATIC

+9 Volts

Gain=2X

RED

R2/R1=GAIN

R2 10k

C1

.1uF

YELLOW

R1

4.99K

IN-

BLUE

+

U2

OUTPUT

YELLOW1

OP A227

IN+

4.99K

R3

10K

R4

C2

.1uF

GREEN

GND

BLACK

-9 Volts

NOV 20,2001

TEST CIRCUIT FOR POST AMPLIFIER

(Using Snap Springboard)

OPA227 POST AMP

MULTIMETER

+9 Volts

NO DATA

RED

Gain=2X

DC V

S

R2/R1=GAIN

+ V2

9V

R2 10k

SIG GND

C1

.1uF

OUTPUT

GND

YELLOW1

IN-

R1

4.99K

BLUE

S

+

U2

YELLOW

IN+

+ V1

9V

4.99K

R3

10K

R4

C2

.1uF

GREEN

GND

S

BLACK

Spring

R5

10K

R6

10K

-9 Volts

S

S

S

+9V

GND

SIGNAL

NOTE: THE OUTPUT VOLTAGE SHOULD BE TWO

TIMES THE INPUT VOLTAGE

NOV 20,2001

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