DROP TESTERPWB Level Drop Tester

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Salon Teknopaja Oy (Ltd)Joensuunkatu 524100 SALOFINLANDwww.teknopaja.com

DROP TESTERPWB Level Drop Tester

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COMPANY INFO

Salon Teknopaja Oy is located in Salo, Finland. It design, manufacture and set up tester devices.

Main product is PWB Level Drop Tester. They are equipped with special measurement devices and softwares which are driven by one user interface. Most customers are electronic industry companies over the world.

Salon Teknopaja Oy makes also different test mechanics and jigs with test needle and probe contacts, Free Fall Testers, Push and Pull Cycle Tester for power supplies, Cable Bending Tester etc.

DROP TESTERPWB Level Drop Tester

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Drop Tester determines reliability of the PWC (Printed Wiring Board) level against mechanical shock

Max drop height 1600 mm

Test control In calibration mode controlled by touch screen; in testing mode controlled by Windows PC and the Event Detector software

Catcher which eliminates the rebound, also possible to switch off

Test method by Jedec standard and others. Tested with the following values of acceleration peak (G)/ pulse duration (ms): 2900 G/ 0.3 ms, 2000 G/ 0.4 ms and 1500 G/ 0.5 ms)

Size of the standard test board Maximum 170 mm x 90 mm

Safety CE Compliant

Specifications

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Noise level in use range ~ 50 – 90 dB, dependant on the absorber material, measured the door open from 3 meter’s distance

Weigth of the table 4 kg

Maximum drop weight approx. 1,5 kg

Material of the table nickel coated aluminium

Shock stone Finnish granite, “Kurun harmaa” weight approx. 100 kg

Standard power inputs main power AC 240 V or AC 110 V; 50…60Hz; ampere req. 6 A (10 A for 110V model); kW requirement 0,7 kW

Motor 0,18 kW with brake

Specifications

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• Wide=670 mm, Deep=570 mm, Height=2500 mm

• Leave free space about half meter every side of tester

• Table location right side

• Weight about 275 kg

• Note these things when design layout, transport tester and install tester

Specifications

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Using the Drop Tester

Calibration of the drop tester Before the test cycles, the tester is

calibrated to meet the requirements of chosen test method. The calibration is done using the acceleration sensor and PC oscilloscope. Oscilloscope is using acceleration sensor to measure the shock. During the calibration normally three parameters are being observed: peak acceleration, pulse duration and pulse shape.

Device coupler

PC Oscilloscope

Event Detector (ED)Acceleration sensor cable

Windows PC

ED-PC cable (RJ45)

Oscilloscope – EDcable (USB)

Drop tester

DROP TESTERPWB Level Drop Tester

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Using the Drop Tester

Calibration of the drop tester These can be monitored in the PC

oscilloscope user interface and the results are also logged in a data file for further analysis. The analysis is done using specific data processing software delivered with the drop tester and the PC oscilloscope (Drop Converter Software).

The specifications for measured parameters are dependant on the used testing method

DROP TESTERPWB Level Drop Tester

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Acceleration sensor fasten to jig, cables to coupler and oscilloscope. Oscilloscopeconnected to PC. Curve and other resultscontrolled with AAC SW on PC display.

G value adjusted with drop height. Pulse width adjusted by changing strike pad

thickness and/or length and with differentstrike plates

Calibration done when test result cpk value is at least 1,33

After acceptable calibration test can bestarted

Drop height value will be transferred to EventDetector SW. Test is done with Event DetectorSW

Calibration and testing

DROP TESTERPWB Level Drop Tester

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Calibration and testing

AAC SW user interface

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Calibration and testing

Accelerationsensor

During calibration tester controlledusing the touch screen

Example of PC oscilloscope display

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Calibration and testing

CPK on-linecalculation

Process capability index CPK

The process capability index, or Cpk, measures a process's ability to create products or results within specification limits.Cpk represents the difference between the actual process average and the closest specification limit over the standard deviation, times three.

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Calibration and testing

Process capability index CPK

“If you hunt our shoot targets with bow, darts, or gun try this analogy. If your shots are falling in the same spot forming a good group this is a high Cp, and when the sighting is adjusted so this tight group of shots is landing on the bullseye, you now have a high Cpk.”

DROP TESTERPWB Level Drop Tester

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Calibration and testing

The PWB in jig

Data processing SWPresenting calibrationresults

DROP TESTERPWB Level Drop Tester

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Calibration and testing

The drop tester includescatcher to eliminate

rebounds

Catcher

MagnetForcatching

DROP TESTERPWB Level Drop Tester

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Drop tester example videos

Video 1 Video 2

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Event Detector• Will be used customer product test• After parameter input testing

automatically untill results reached• Instrument is developed for detect

electrical breaks• Shortest break >0,7 µs• Controlled via GPIB• Operation system Windows 7 (32/64 bit)

General info

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Event Detector

Windows PC

ED-PC cable (RJ45)

Drop tester

Ribbon cable

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Event Detector

Clicking channels

break count window

the user will get brief

statistics display

Break count is shown

with numbers and

changing colours

The user can choose

what will be diplayed

in the bottom line

TEST SUMMARY :

Test Cycles Executed : 11

Shock Shock Shock Shock Shock Steady Steady Steady Steady Steady

Card Chan Total First Last Longest Failure Total First Last Longest Failure

Num Num Breaks Break Break Contin. Rate Breaks Break Break Contin. Rate

1 1 0 0 0 0 0.00 0 0 0 0 0.00

1 2 0 0 0 0 0.00 0 0 0 0 0.00

1 3 0 0 0 0 0.00 0 0 0 0 0.00

1 4 0 0 0 0 0.00 0 0 0 0 0.00

1 5 2 10 11 2 100.00 2 10 11 2 100.00

1 6 0 0 0 0 0.00 0 0 0 0 0.00

1 7 1 4 4 1 01.12.50 0 0 0 0 0.00

1 8 0 0 0 0 0.00 0 0 0 0 0.00

1 9 0 0 0 0 0.00 0 0 0 0 0.00

1 10 1 2 2 1 01.10.00 0 0 0 0 0.00

1 11 7 5 11 7 100.00 7 5 11 7 100.00

User Interface

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Event Detector How does it work

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Event DetectorEXAMPLE

Meas current and threshold voltage are

given in basic configuration.

● Rdut=500Ω Imeas=1mA

Uthres=1V

● Uthres / Imeas = Rthres 1.0V / 1.0mA

= 1kΩ

● If Rdut is 500Ω during testing Uin is

0.5V (1mA*0.5kΩ). Because

Uthres(1V)> Uin (0.5V)

no break is detected.

● If Rdut suddenly raises >1kΩ and

because current is constant, Uin > Uthres.

This will be interpreted as break.

Operation

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Event Detector

• Choice channel amount used (e.g. 12)• Specify how many breaks allowed for exact

amount of channels• Choice e.g. channels 4-8 to monitoring.

Decide every channel allowed max 5 breaks

• Test ends when in every channel has at least 5 breaks (some channels may havemore)

When test ends

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Event DetectorFAQ

What is Clamp Voltage?

-The Clamp Voltage is kind of ”emergency stop” for voltage rise. Itlimits specimen’s voltage to it’s value and stops testing.

What is optimal cable lenght?

-Optimal cable lenght is 2 meters. Over 2.5 metrer cable is notrecommended.

What is Event’s Duration sensitivity?

-Minium detectable break is 0,6 µs (HIGH). Other availablesettings are 1.5 µs (MEDIUM) and 3 µs (LOW).

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Event DetectorFAQ

-Event Detector is not oscillosscope, sampling rate is 1/drop. Hardware is ”armed” to detect breaks. If break occur during drop, it will be stored to Event’s memory. After strike data will be stored to log file and shown on user interface. Next Event measures ”steady state” to track broken cables. Then it is ready for another drop.

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Drop tester service and maintenance• Drop tester is to be maintained and repaired only by a professional

staff, which have read and understood the User and service guide• The maintenance should be done periodically and all actions must

be recorded in a service diary. Use of a check list of actions is recommended

• Every me before starting to operate the drop tester, check all the functionality of the safety devices. Please also check that there are no obstacles to harm the movement of the sledge or the carrier

• If you must temporarily remove any safety devices or shields, be sure to place them back after maintenance or repair work

• Use only spare parts delivered or approved by the device manufacturer (Salon Teknopaja)

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Drop tester service and maintenanceMaintenance tasks

• Every time when the tester is used• check that the drop base is clean• clean the machine from the dust and excess stuff. Avoid touching slides when cleaning• perform visual inspection over the tester

• Monthly actions Check the tightness of the screws. Check the tightness of the engine’s tooth belt. Check the tightness of screws in the shaft coupling and the motor. Check all the other parts and replace broken and old parts. Clean the machine.

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Drop tester service and maintenanceMaintenance tasks

Each 6 months you should: check the bearings and change if necessary check that the tester is in horizontal position and steady check the gap of the lift magnets

Each 12 months is recommended on-site maintenance by Salon Teknopaja Oy

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THANK YOU FOR INTEREST!