ASCEL Electronic AE20204 Instructions d'installation et d'utilisation

Æ20204 LC METER

Assembly and

Operation Manual

REV 3.0 EN

Table of Contents

Safety Information.....................................................................ii

Handover of a Device Built From a Kit....................................iv

Intended Use.............................................................................iv

ESD Warning.............................................................................v

AE2 2 4 LC METER................................................................1

Circuit Description.....................................................................2

Soldering....................................................................................5

Component Reference................................................................7

Assembly..................................................................................15

Troubleshooting Checklist.......................................................18

Power Supply...........................................................................2

Case Mounting.........................................................................21

Operation..................................................................................22

Circuit Diagram.......................................................................25

Bill of Materials.......................................................................26

Component Placement.............................................................28

Data Interface...........................................................................29

Specifications...........................................................................32

Warning

Please read this manual before you assemble and use this it.

Keep it accessible for all users at all times.

Safety Information

Know and follow the applicable regulations for

electric devices in your region. In Germany,

these are especially VDE 0100, VDE

0550/0551, VDE 0700, VDE 0711 and VDE

0860. Pay attention to the following safety

advices:

• Disconnect the power supply before opening the case.

• Wor on devices only if you made sure that they are

disconnected from any power supply, and any possible charge

inside is discharged.

• Devices must only be used if they are mounted in a case in a

way that prevents the user from touching any live wires or

parts. Disconnect the device from its power supply during

assembly.

• Always chec the power cords for brea s or damaged

insulation. Replace any defective parts immediately.

• See advice from a qualified expert if you are not sure about

any specific value of a part, an installation procedure, or how

to connect accessories.

•Always chec if the device is suitable for the intended purpose

before putting the unit in use. See assistance from a qualified

professional or the manufacturer if you are not sure.

• The manufacturer assumes no liability for errors made during

assembly or operation.

• Devices that need a supply voltage greater that 24V may be

assembled by professionals only, to avoid hazards from

improper assembly.

• In schools, educational institutes or wor shops, the use of this

unit must ta e place under the supervision of qualified staff.

• Do not put this unit in use in an environment where the ris of

fire or explosion or explosive gas, vapor or dust is present.

• If the unit must be repaired, use original parts only. The use of

inappropriate parts may lead to a safety ris .

• Avoid wor ing alone.

• Keep electronic parts away from children.

• Do not replace parts with such that does not meet the required

parameters. For example: never replace a fuse with another one

with higher nominal current!

• Other regulations may apply. Please chec the local safety

regulations for assembling electronic devices.

iii

Handover of a evice Built From a Kit

(in countries where applicable)

If you hand over a device built from a it, you legally become

the manufacturer. This means you are responsible for

complying with the appropriate regulations for electronic

devices. All accompanying papers, in particular this manual,

must also be passed over. Where necessary (for example in the

European Union) you must also publish your identity to the

consignee.

Intended Use

(in countries where applicable)

The intended use of this device is measuring the values of

capacitors and inductors.

• Other uses are not approved!

ES Warning

What is ESD?

ESD (Electrostatic Dis-

charge) is the sudden flow

of electricity between two

objects caused by contact

or an electrical short. It

can reach very high voltages of many V. In some cases even

over 100 V!

Causes of ESD

The main cause of ESD events is static electricity. Static

electricity is usually generated through tribocharging, li e

wal ing on a rug, ascending from a fabric seat, removing some

types of plastic pac aging or using non-ESD compliant tools.

Danger of ESD

The high voltage pulse can easily destroy electronic parts. ICs

and FETs are very sensitive to high voltage. Even a short,

single touch may destroy a part!

How do I prevent damage due to ESD?

Always ground yourself while wor ing with electronic parts. A

grounded conducting wrist strap and proper anti-static wor

surface mat will help prevent ESD damage. Also ma e sure

that the soldering iron is grounded and ESD-safe.

Warning symbol for an

electrostatic sensitive device

AE20204 LC METER

The AE20204 LC Meter allows the measurement of

capacitance and inductance of passive components,

particularly very small values, even below 1 pF / 1 µH. The

resolution thereby is 0.01 pF (10 fF) / 10 nH. It is an invaluable

aid for amateur radio enthusiasts, as well as anyone engaged in

electronics.

The RS232/USB interface1 allows the included software to

access the readings and show them on screen. Logging is also

supported. The easy, plain text command protocol allows

simple integration with external tools and systems.

All SMD (Surface Mounted Device) components are already

soldered, so the it is also suitable for beginners in electronics.

The comprehensive manual should help answer all questions

that may arise during assembly.

Please read the complete manual (especially if you are not yet

experienced in electronic engineering) before building the it.

1USB optional

Circuit escription

To measure capacitance and inductance, the AE20204 LC

Meter uses an oscillator composed of IC2, C7, C8, C9, L1, R2,

R3, R4, R5 and R9. The tested capacitor is switched in parallel

to C9 to measure capacitance. The tested inductor is switched

in series to L1 to measure inductance. This lowers the

oscillator's frequency.

The microcontroller IC1 is used to measure this frequency and

calculate the value of the tested capacitor or inductor. The

value is displayed on the LCD and output to the RS232/USB

interface. T1, R8, R10 and R1 provides the correct voltage

levels for the RS232 interface. IC4, C13, C14, C15, C16, R12

and R13 implements the USB interface.

Note: with the USB model, the UART-to-USB-Bridge FT23 XS

(IC4) is pre-assembled.

The positive regulator IC3 provides the 5V voltage for the

device. C4, C5 and C11 are bypass filters, D1 is an input

protection diode.

The relay K2 switches the input between series and parallel

connection, which selects capacitance or inductance

measurement. K1 is used to switch the precision capacitor C10

to the oscillator. D2 and D3 are flybac diodes for the relays.

The LC meter requires no calibration as it uses a precision

0.5% tolerance reference capacitor (C10) to determine the

exact values of the capacitor and inductor (C9 and L1) that

forms the oscillator. The method is described below.

First, the frequency without C10 is measured (f1).

f1=1

2⋅π⋅

√

L1⋅C9

Then, the frequency f2 is measured with C10.

f2=1

2⋅π⋅

√

L1⋅(C9+1000pF)

C9 can be obtained by equalizing both equations.

C9=f22

f12−f22⋅1000pF

Since C9 is nown now, L1 can be calculated.

L1=1

4⋅π2

⋅f12

⋅C9

This self-calibration is performed on start-up. To measure

components, frequency f3 is obtained with the component

under test connected to the oscillator. The un nown

capacitance Cx or inductance Lx can be calculated as follows:

Cx=[ f12

f32−1]⋅C9

Lx=[ f12

f32−1]⋅L1

This method allows the measurement of very small values, for

example the capacitance of cables.

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