OKOndt GROUP Eddycon C User manual

Eddy current flaw detector
Eddycon C
Quick start guide
www.okondt.com

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CONTENTS
P.
1 CONTROLLERS OF EDDYCON C FLAW DETECTOR ..........................................................3
2 SETTINGS OF «TEST» MENU ......................................................................................................5
3 INSTRUCTIONS FOR USE .............................................................................................................7
3.1 THRESHOLD LEVELS SETUP...............................................................................................7
3.2 SINGLE COIL PROBE ............................................................................................................10
3.3 REFLECTION, DIFFERENTIAL PROBE .........................................................................16
3.4 ROTATION PROBE................................................................................................................21
3.5 "CONDUCTIVITY" MEASUREMENT...............................................................................27

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1CONTROLLERS OF EDDYCON C FLAW DETECTOR
1.1 The flaw detector is operated by one operator who has a corresponding
level of qualification and has studied the present “Quick start guide”.
ASSIGNMENT OF KEYBOARD BUTTONS
-automatically puts a displayed signal from lift-off (or from any
interference) in horizontal position;
-in the mode of name editing –selects a digit/letter
-changes the parameter variation step;
-in the mode of name editing –selects a digit/letter
-increases the selected parameter;
-in the mode of name editing –selects a digit/letter
-changes the frequency;
-in the mode of name editing –selects a digit/letter
-moves up through the menu;
-in the mode of name editing –selects a digit/letter
-decreases the selected parameter;
-in the mode of name editing –selects a digit/letter
-cancels the selection;
-in the mode of name editing –selects a digit/letter;
-pressing the button results in displaying the firmware version
in"SETTINGS" menu;
-deletes point in “CALIBRATION" menu;
-freezes the display in the test menu
-moves down through the menu;
-in the mode of name editing –selects a digit/letter
-confirms the selection;
-in the mode of name editing –selects a digit/letter;
-pressing the button in "TEST" menu results in saving of current
setup as a default one (if the current item is above the ALARM item);
-adds point in “CALIBRATION" menu
-quick access to "TEST" menu
-quick access to "SETTINGS" menu

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-quick access to "VIEW" menu
-quick access to "MEMORY" menu;
-confirms the saving of the entered name of the file or folder while
operating in "MEMORY" menu
-quick access to "CALIBRATION" menu
-automatically sets the parameters of single coil (parametric) ECP
with switched on Single input;
-sets the number of rounds while operating with eddy current
rotary scanner
-switches On/Off the instrument

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2SETTINGS OF «TEST» MENU
FIGURE 1 - Settings of «TEST» menu
∎Navigation menu:
1. FREQ –test frequency. Operating frequency of ECP.
2. PRE AMP –preamplifier gain. It is used to amplify weak signals.
3. GAIN –main gain. It is used to amplify weak signals.
4. H GAIN –horizontal gain. It is used for visual separation: the signal
from the defect and the signals from the noises.
5. V GAIN –vertical gain. It is used for visual separation: the signal from
the defect and the signals from the noises.
6. DRIVE –probe drive level. It is used for electromagnetic field excitation
and formation of eddy currents in the object of testing. More often it is used the
voltage value of 4 V and 6 V is applied while carrying out testing through a layer of
nonconducting gap (for example –paint coating, etc.).
7. PHASE –phase adjustment. It is used for visual repositioning of eddy-
current signal in the complex plane.
8. FILTER –filter type. Filters are used to reduce various kinds of noise
and improve the quality of eddy-current signal for analysis.
AVRG –averaging filter (particular case of LP filter). It is used to reduce
noisiness and high-frequency noise impact. 17
LP –low pass filter. It is used to reduce noisiness of eddy-current signal and
filter out high-frequency noise.
HP –hight pass filter. It is used to filter out low frequency noise (eg - signals
that occur: 1) when changing the ECP turning angle at manual testing, 2) in case of
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changing the gap between ECP and the object of testing, 3) in case of change of
electromagnetic properties of the material, etc.).
BP –band pass filter. It is used to create bandwidth of useful eddy-current
signals - signals from defects and to filter out low-frequency and high-frequency
signals from noise. It is more often used at automated or mechanized testing with a
constant ECP moving speed relative to the object of testing.
9. POSITION –spot position. Changing the position of the center of the
complex plane on the screen of the flaw detector. It is used to increase the usable
space on the screen of the flaw detector.
Can be set in the following positions: –complex plane center, –in the
right center of the screen, –in the right upper corner, –in the upper center
of the screen, –in the left upper corner, –in the left center of the screen,
–in the left bottom corner, –in the bottom center of the screen,
–in the right bottom corner, –per-channel display when operating in double
frequency mode.
10. GRID –grid. Different types of the screen markup to improve the visual
analysis of signals.
11. AXIS –axis. On / off position of the display of coordinate axes on the
screen of the flaw detector.
12. ALARM –activation and setting of frames (threshold levels). Types of
frames: –frames are switched off, –circle frame type, –threshold frame
type, –sector frame type, –trapezium frame type.
13. SWEEP –number of points in a screen scan.
14. PROBE –type of connector.
Single (Lemo 00) –for connection and operation with single coil probe.
Refl (Lemo 16) –for connection and operation with Reflection type probe.
Bridge (Lemo 16) –for connection and operation with Bridge type probes.
15. RPM –rounds per minute for the eddy current rotary scanner.
16. ROT PRESENT –type of connected rotary eddy current scanner.
17. Parameters of the occupancy of the input circuit.
Parameter "T: …/…/..." shows:
1) The value of a signal amplitude at the input of the receiving circuit
expressed in % of the maximum possible;
2) Input circuit is not balanced, after performing the balancing in %.
Current value of the occupancy of the input circuit expressed in % of the
maximum possible.

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3INSTRUCTIONS FOR USE
3.1 THRESHOLD LEVELS SETUP
∎Setup of "Circle" type frame
To set up circle type frame, operator should select "Type: " in special item of
settings ALARM –.
FIGURE 2 –Setup of "Type: " of threshold level
"R:" parameter variation allows changing of the inner radius of threshold
level.
∎Setup of "Level" type frame
To set up threshold type frame, operator should select "Type: " in special
item of settings ALARM –.
FIGURE 3 –Setup of "Type: " of threshold level
"H:" parameter variation allows changing of the height of the threshold level.
R
H

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∎Setup of "Sector" type frame
To set up sector type frame, operator should select "Type: " in special item
of settings ALARM –.
FIGURE 4 –Setup of "Type: " of threshold level
"R:" parameter variation allows changing of the inner radius of threshold
level.
"W:" parameter variation allows changing of the width of threshold level.
"α:" parameter variation allows changing of turning angle of threshold level
relative to the complex plane center.
"β:" parameter variation allows changing of turning angle of threshold level.
Select the frame polarity "Pol:", which makes the alarm trigger:
–the signal gets beyond the limits of the threshold level;
–the signal is within the limits of the threshold level.
If the symmetrical displaying of threshold level on the position “Symm:” with
, buttons is required, this parameter can be activated.
∎Setup of "Trapezium" type frame
To set up trapezium type frame, operator should select "Type: " in special
item of settings ALARM –.
R
W
β
α

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FIGURE 5 –Threshold level setup of "Type: "
"X1:" parameter variation allows changing of the angle position of threshold
level in X1-direction.
"X2:" parameter variation allows changing of the angle position of threshold
level in X2-direction.
"Y1:" parameter variation allows changing of the angle position of threshold
level in Y1-direction.
"Y2:" parameter variation allows changing of the angle position of threshold
level in Y2-direction.
Select the frame polarity "Pol:" which makes the alarm trigger:
–the signal gets beyond the limits of the threshold level;
–the signal is within the limits of the threshold level.
Y2
Х2
Х1
Y1

3.2 SINGLE COIL PROBE
3.2.1 Connect the ECP to the flaw detector using a connecting cable.
№
Connecting cable
Connector to
Eddycon C
Connector
to ECP
Connector view
1
Lemo 00-Lemo 00
Lemo 00
Lemo 00
Lemo 00
2
Microdot
Lemo 00
Microdot/M5
Microdot
3
Lemo 00-BNC
Lemo 00
BNC
BNC
FIGURE 6 –Eddycon C eddy current flaw detector. Right side panel
Single coil
(parametric) eddy
current probe (ECP)
connector

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Note. Changing of the following parameters is performed using the
buttons , and .
3.2.2 Select parameter "PROBE"–"Single" type (pos. 14,
3.2.3 FIGURE 1).
3.2.4
3.2.5 Set the ECP frequency " FREQ" (pos. 1,
3.2.6 FIGURE 1) in a range specified in the registration certificate for the
ECP.
3.2.7 Set the ECP drive " DRIVE" (pos. 6,
3.2.8 FIGURE 1) not more than 2 V, if the object of testing has no paint
coating. If the object of testing has heavy paint coating, then it is allowed to set the
parameter of the ECP drive ( DRIVE) more than 2 V, but this increasing should
not lead to the overshoot of the input circuit occupancy (over-occupancy).
3.2.9 Press button to select the capacitor.
3.2.10 If the materials to be tested are of aluminum or titanium alloys, then it
is recommended to select the position of the center of the complex plane in the
lower right corner (fourth quadrant) –. In case of ferromagnetic materials
testing it is recommended to select the position of the center of the complex plane
in the bottom center of the screen –..
3.2.11 Place the ECP onto the flaw-free area of a calibration block.
FIGURE 7
3.2.12 Press button to balance the ECP.
3.2.13 Put a signal from a lift-off in the horizontal plane. For this, it is
necessary to decline the ECP from the vertical axis at an angle of 15-45 ˚ or pick the
ECP up. While the vector end is deviated, press button.

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FIGURE 8 –Operations with signal from lift-off
In case if the first attempt to put the signal from the lift-off horizontally failed,
it is necessary to repeat the steps described above, or put the lift-off signal
manually using the phase change ( parameter). The signal from a defect should
be appeared in the first or second quadrant of the complex plane.
FIGURE 9 –The signal from: 1) lift-off, 2) defect
3.2.14 Increasing the gain on preamplifier “ PRE AMP” and gain “ GAIN”
you should maximize the signal amplitude, but at the same time monitor behind
parameters of the input circuit (pos. 17,
EC signal from lift-off
before “AUTO LIFT”
2)
1)

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3.2.15 FIGURE 1).
FIGURE 10 –Operations with preamplifier “ PRE AMP” and gain “ GAIN”
3.2.16 After changing any parameter that affects the absolute value of the
signal it is necessary to perform balancing by pressing button.
3.2.17 While testing materials of aluminum and titanium alloys, it is
recommended to use the vertical gain " V GAIN" for the visual spread of signals
from the lift-off and signals from a defect in a phase.
FIGURE 11 –Operations with " V GAIN"

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3.2.18 To suppress high frequency noise it is recommended to activate LP
filter.
FIGURE 12 –Operations with LP filter
3.2.19 Select the required type of a threshold level.
3.2.19.1 Setting will be demonstrated on the example of threshold level type
“- level”.
3.2.20 Select at ALARM position the type of threshold level “ - level”.
3.2.21 Move the probe across the artificial defect at calibration block for
several times and visually set up the ALARM relative to the signal from the defect.
3.2.22 To change the height of the level press the button on the
position ALARM and after moving to " Н " parameter, change it to the required
size.
3.2.23 After the ALARM is properly set up, the light alarm while detecting
the defect will trigger on the flaw detector keypad (digital indicators on the
display) and sound alarm (if it has not been turned off in "SETTINGS" menu).

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FIGURE 13 –Operations with threshold
3.2.24 In case of need of automatic screen clearing, click the button and
at the parameter “Persistence” choose the time after which the screen is cleared.
3.2.25 By repeated pressing of button, it is possible to select a
convenient type of the signals display on the screen of the flaw detector

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3.3 REFLECTION, DIFFERENTIAL PROBE
3.3.1 Connect the ECP to the flaw detector using a connecting cable.
№
Connecting cable
Connector to
Eddycon C
Connector
to ECP
Connector view
1
Lemo 16-Lemo 04
(Reflection)
Lemo 16
Lemo 04
Lemo 04
2
Lemo 16-Lemo 04
(Bridge)
Lemo 16
Lemo 04
Lemo 04
3
Lemo 16 -
Lemo Triax
(Reflection)
Lemo 16
Lemo Triax
Lemo Triax
4
Lemo 16 -
Lemo Triax
(Bridge)
Lemo 16
Lemo Triax
Lemo Triax
2
FIGURE 14 –Eddycon C eddy current flaw detector. Right side panel
Universal connector for
eddy current probe
(ECP) and eddy current
rotary scanner

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3.3.2 Select parameter "PROBE"–"Reflection" or "Bridge" type (in the
"TEST" menu).
3.3.3 Setting will be demonstrated on the example of «Bridge» type probe.
FIGURE 15 –Operations with probe type
3.3.4 Set the ECP frequency " FREQ" (pos. 1,
3.3.5 FIGURE 1) in a range specified for the ECP in the registration
certificate.
3.3.6 Set the ECP drive " DRIVE" (pos. 6,
3.3.7 FIGURE 1) recommended for the ECP in the registration certificate.
3.3.8 Place the ECP onto the flaw-free area of a calibration block.
FIGURE 16
3.3.9 Press button to balance the ECP.

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3.3.10 Increasing the gain on preamplifier “ PRE AMP” and gain “ GAIN”
you should maximize the signal amplitude, but at the same monitor behind
parameters of the input circuit (pos. 17,
3.3.11 FIGURE 1).
3.3.12 After changing any parameter that affects the absolute value of a signal
it is necessary to perform balancing by pressing button.
FIGURE 17 –The signal from the defect before applying the gain
FIGURE 18 –The signal from the defect after applying the gain
3.3.13 It is recommended that the signal from the defect should be placed in
the first or second quadrant of the complex plane.

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3.3.14 For convenience, it is recommended to select the position of the center
of the complex plane in the middle of the screen - - complex plane center, or at
the bottom center of the .
3.3.15 To correct the ECP signal phase use parameter.
FIGURE 19 –The signal from the defect after adjusting the phase and
repositioning the center of the complex plane
3.3.16 Select the required type of a threshold level.
3.3.17 Setting will be demonstrated on the example of the threshold level
type “ –level”.
3.3.17.1 At the position ALARM select the type of the threshold level “ –
level”.
3.3.17.2 Move the probe across the artificial defect at calibration block for
several times and visually set up the ALARM relative to the signal from the defect.
3.3.17.3 To change the height of the level, press the button at the
position ALARM, and having moved to the “Н” parameter, change it to the
required size.
3.3.18 Move the probe across the artificial defect at calibration block for
several times and visually setting up the ALARM relative to the signal from the
defect. After the ALARM is properly set up, the light alarm while detecting the
defect will trigger on the flaw detector keypad (digital indicators on the display)
and sound alarm (if it has not been turned off in "SETTINGS" menu).

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FIGURE 20 –Threshold level set up
3.3.19 In case of need of automatic clearing of the screen, click the
button and on the parameter "Persistence" choose the time, after which the screen
is to be cleared.
3.3.20 Repeatedly pressing the button, one can select a user friendly
type of the signals displaying on the screen of the flaw detector.