DROP TESTER PWB Level Drop Tester Salon Teknopaja Oy (Ltd) - - PowerPoint PPT Presentation

DROP TESTER

PWB Level Drop Tester

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Salon Teknopaja Oy (Ltd) Joensuunkatu 5 24100 SALO FINLAND

www.teknopaja.com

DROP TESTER

PWB 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.

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PWB 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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PWB Level Drop Tester

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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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PWB Level Drop Tester

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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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PWB Level Drop Tester

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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

• scilloscope. 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 – ED cable (USB) Drop tester

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Using the Drop Tester

 Calibration of the drop tester

 These can be monitored in the PC

• scilloscope 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

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 Acceleration sensor fasten to jig, cables to

coupler and oscilloscope. Oscilloscope connected to PC. Curve and other results controlled 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 different strike plates

 Calibration done when test result cpk value is

at least 1,33

 After acceptable calibration test can be

started

 Drop height value will be transferred to Event

Detector SW. Test is done with Event Detector SW

Calibration and testing

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PWB Level Drop Tester

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Calibration and testing

AAC SW user interface

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PWB Level Drop Tester

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Calibration and testing

Acceleration sensor During calibration tester controlled using the touch screen Example of PC oscilloscope display

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Calibration and testing

CPK on-line calculation

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,

• r 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.”

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PWB Level Drop Tester

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Calibration and testing

The PWB in jig Data processing SW Presenting calibration results

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Calibration and testing

The drop tester includes catcher to eliminate rebounds

Catcher

Magnet For catching

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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

16 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 cou nt is shown with nu mbers and changing colou rs 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 0.00 0 0.00 1 2 0 0.00 0 0.00 1 3 0 0.00 0 0.00 1 4 0 0.00 0 0.00 1 5 2 10 11 2 100.00 2 10 11 2 100.00 1 6 0 0.00 0 0.00 1 7 1 4 4 1 01.12.50 0 0.00 1 8 0 0.00 0 0.00 1 9 0 0.00 0 0.00 1 10 1 2 2 1 01.10.00 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 Detector

EXAMPLE 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 have more)

When test ends

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Event Detector

FAQ

What is Clamp Voltage?

• The Clamp Voltage is kind of ”emergency stop” for voltage rise. It

limits 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 not

recommended.

What is Event’s Duration sensitivity?

• Minium detectable break is 0,6 µs (HIGH). Other available

settings are 1.5 µs (MEDIUM) and 3 µs (LOW).

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Event Detector

FAQ

• 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 maintenance

Maintenance 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 maintenance

Maintenance 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!