ASCEL Electronic AE20204 Instrucciones de instalación y funcionamiento
Æ20204 LC METER
Assembly and
Operation Manual
REV 3.0 EN
© 2014 Ascel Electronic
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
i
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.
ii
•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!
iv
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.
v
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
1
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.
2
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.
3
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