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StressScreening


With high speed to top quality
Stress Screening Systems WT/WK

Weiss Umwelttechnik GmbH
Simulationsanlagen ? Messtechnik

Safety first . . .

. . . re

liable testing to guarantee safety
High product reliability is a basic requirement for today’s competitive market and is often the only difference between the various manufacturers.

ESS
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The reliability of electronic products can be substantially improved by the use of environmental stress screening (ESS) techniques to minimize the risk of errors and failures of products and simultaneously improve the reputation of a company.

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ESS

What is ESS?

The test . . .
[ °C ]

During the ESS test, the products are subject to precisely defined stress so that defects in components and PCBs can be detected before leaving the manufacturer’s plant. Detecting weak points considerably improves the robustness of the products. Unreliable systems are filtered out before they reach the customers. Each product requires a specially adapted ESS technique.

+ 180

+ 80

- 40

- 70 10 20 t [min]

The advantages of ESS are . . .

ESS

Improvement of product reliability. The products do not simply function, they operate correctly for a long period of time. The quality itself is substantially improved, customer satisfaction increases and the sale of reliable products likewise. Reliable products ensure that the reputation of the manufacturer on the market remains a good one.

ESS means reduced costs as product failures do not occur during the warranty period when they are already in the possession of the customer. ESS reduces the risks which can occur in products due to components or processes and there is less risk involved when a new product or new technology is introduced.

ESS means quick “feedback” . Construction or process problems can be detected more rapidly which means a quicker “learning curve” Also “feedback” . is obtained directly from inhouse quality assurance and not via the customer.

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ESS Methods

Mode and effects . . .
F

In practice, the following ESS methods have prevailed: – Temperature stress – Vibration stress – Humidity stress in conjunction with electrical stress. Our stress screening test cabinet series was specially designed for temperature stress. The WK series of climatic test cabinets is available for humidity stress. Environmental stress screening on PCBs (or other products) is achieved by thermal stress with quickly changing temperatures. ESS is the most effective method of detecting poor soldering joints and SMD processes as well as manufacturing errors before delivery. Typical ESS profiles contain a thermal change with 5 . . .15 K/min over a wide difference in temperature (see technical data on page 10/11). The periodic or constant switching of the boards during the thermal cycle can increase the detection of errors. The above mentioned results are achieved in special ESS chambers because the heating and cooling capacity as well as the amount of circulating air is considerably higher than that of a conventional test chamber. High amounts of circulating air improve the heat transition and ensure that the specimens and/or boards are homogeneously stressed. Weiss Umwelttechnik has developed a range of systems especially for this purpose which does more than justice to the above mentioned requirements.

1

2

3

t

Service life curve of electronic components ESS means that errors which normally occur during the usage phase occur in the production phase F = error ? t = time 1 = early failures ? 2 = usage phase ? 3 = wear phase

T T2

t

2

Tu t t T1
1

Z

Temperature shock cycling test as per IEC 60068-2-14, Test Nb T = temperature ? T1 = low temperature ? T2 = high temperature Tu = ambient temperature ? Z = cycle ? t = time

A 15 K / min B 10 K / min 5 K / min ?? 80 K

C

?? 40 K ?? 20 K

t

Effectiveness of thermal cycles and high temperature storage for preconditioning of circuit boards A = effectiveness ? B = thermal cycles ? C = high temperature storage ? t = time ?? = temperature increase to max. working temperature

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ESS

Convincing technology. . .

. . . the stress screening systems of the series WT/ WK
The test systems based on the well-tried modules of the WT and WK series with increased power for heating, cooling and circulating air and test chamber volumes of 190 to 1540 litres are capable of meeting virtually all requirements. The WK series also complies with customary climatic test standards. The technology of the systems, as is to be expected from the ergonomic design, provides optimum operation and reliable functioning: Powerful, homogeneous temperature and/or climate conditioning of the test chamber. The specimens are protected by an independent temperature measurement. The humidity sensor of the WK series is self-cleaning. Optimized air ductwork for all test chamber volumes. Touch panel with simple, menuguided operation – no programming knowledge required. 32 bit processor Easily accessible maintenance elements ensure minimum service times for the condenser, water bath and humidity sensor. Automatic water replenishment without interrupting operation with large storage tank for the WK series. Environmentally friendly, highquality insulation. Easy-to-clean test chambers thanks to special welding and molded racks. Tightly sealed and easy-toclean surfaces thanks to powder coating.

ESS
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Function and technology in detail . . .

Construction features and function principle
The beautifully designed outer casing is made of corrosion-resistant, galvanized sheet steel with an environmentally friendly coating. The test chamber door is hinged on the left and has optimum contact pressure when closed. The machine unit with the large cooling units is located underneath the test chamber in a maintenancefriendly position. The entire power electronics is located in a switch cabinet at the back of the test chamber. Every electronic function circuit has its own safety mechanism which switches off the relevant function circuit and/or the entire test chamber when faults occur. The test space is made of highgloss polished, high-quality stainless steel and is vapor-tight welded. The evaporator, heating elements and the large ventilation equipment with external drive motors are installed behind the conduit which is at the back of the test space. A special air ductwork system together with the enhanced temperature conditioning systems ensures quick and even temperature conditioning of the specimens. The test chamber is equipped with separate sensors to protect the specimens irrespective of the temperature control system. Additional ducts in the side panels are provided for the electrical connections of the specimens from the outside. The temperature conditioning system of the WK series is also equipped with humidification and dehumidification equipment with a humidity sensor. The humidity sensor is located in front of the specimens in the air stream together with the control sensor for the temperature.

Standard version
Low/high temperature safety cutout as per EN 60519-2 (1993) with separate sensor, thermal safety class 2 Touch panel – adjustable in height Parallel printer interface for HP deskjet color and EPSON printer Serial interface RS 232 C 4 potential-free switching inputs and outputs Contactless switching of heating elements 50 mm entry port in the left and 125 mm ? in the right side panel Loose grid Water-cooled condensers Additional features for WK series is also equipped with a humidity calculator and an integrated threshold value monitoring system for humidity. Low water indicator Special temperature conditioning system in the climate working range for high temperature and humidity constancy. Psychrometric humidity measurement with automatic humidification.

Options
Notebook operating station with color display mounted on a swivel arm HP deskjet color printer or EPSON black/white Software package for Windows 98/ME, Windows NT 4.0/2000/XP Prof. Additional potential-free switching inputs and outputs Measured data recording system for Pt 100 and voltage signals ± 10 V Configuration modules for interface standards e.g. RS 422, RS 485, IEEE 488.2 and optical waveguide Mobile version Analog outputs for set and actual values Additional Pt 100-sensor/thermal elements Door with window Door with window and reachthrough openings Fresh air purge system Entry ports 50 mm, 80 mm, 125 mm ? Other mains supplies and frequencies Air-cooled condenser Protection against condensation with dehumidifier for avoiding condensate on the specimens Sound insulation Notches Additional features of WK series Dewpoint extension in the climate range Capacitive humidity measurement Further options and special accessories on request.

ESS
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. . . Operation and Documentation

. . . convenient and stress-free operation
The touch panel for defining the program is on the left side of the door. It can be adjusted to the height of the operating personnel and is removable. The operating interface with a resolution of 320 x 240 Pixel is menuguided for the input of constant and program operation with representation of the set and actual values as graphs, the operating time and remaining number of cycles etc. including help functions. The created programs are imported into the measurement and control system . is a self-monitoring, digital 32 bit measurement and control system and is responsible for all functions required for control. The highly efficient software SPS monitors and coordinates all functions and provides information on interruptions in operation. The program memory can store a max. of 100 programs which are simple to create and store. Connection to a host computer system is possible via the serial interface RS 232 C. The possibility to operate the system using a “laptop” is also available as an option. The system is compatible with the simulation management software .

... software – the optimum choice

, the computer-aided simulation management software provides complete documentation and evaluation represented in the form of a graph. Installed on the optional notebook operating station, the user has access to the full PC performance potential. This means controlling the test sequence, storing measured data, creating comfortable test programs with the graphics editor and printing the measured data in the form of a graph and copying in other programs for evaluation purposes. Max. 32 systems can be networked. Thanks to an internal interface, the software is compatible with Microsoft Word, Microsoft Paint, Microsoft Excel, National Instruments Labview and special user software.

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ESS

Technical data . . .

Stress Screening Systems
Type Test space contents Test space dimensions Height Width Depth Outside dimensions Height Width Depth Performance for temperature tests Temperature range °C – 40 +180 Change rate as per IEC (1) Heat compensation Cooling Heating at + 20 °C at – 20 °C Temperature fluctuation Calibration values Performance for climatic tests Temperature range Dewpoint range Humidity range Humidity fluctuation Temperature fluctuation Heat compensation (2) Calibration values Electrical connection Max. connected load Max. current consumption Sound pressure level – 1 m from the front (3) Cooling water consumption (4) max. Weight kW A dB(A) m3/h kg 7.5 17 61 1.9 420 10 21 64 1.4 460 7.5 17 61 1.9 460 °C °C % r. h. % r. h. K W 400 400 400 K/min K/min W W K 8.0 7.0 4000 1500 – 70 +180 7.5 7.5 3000 3000 – 40 +180 6.8 6.5 4000 1500 – 70 +180 6.7 6.8 3000 3000 WT11/ WK11 Litres mm mm mm mm mm mm 180/ 40/5 190 750 580 450 1780 865 1280 180/ 70/5 190 750 580 450 1780 865 1280 340/ 40/5 335 750 580 765 1780 865 1595 340/ 70/5 335 750 580 765 1780 865 1595

5 K/min
600/ 40/5 600 950 800 800 1980 1085 1655 600/ 70/5 600 950 800 800 1980 1085 1655 1000/ 40/5 990 950 1100 950 1980 1385 1850 1000/ 70/5 990 950 1100 950 1980 1385 1850 1500/ 40/5 1540 950 1100 1475 1980 1385 2375 1500/ 70/5 1540 950 1100 1475 1980 1385 2375

– 40 +180 6.5 6.0 5000 2000

– 70 +180 6.0 6.0 5000 5000

– 40 +180 6.7 6.1 5000 2000

– 70 +180 6.0 6.1 5000 5000

– 40 +180 6.3 6.0 5000 2000

– 70 +180 5.0 6.0 5000 5000

± 0.1 to ± 0.5 in time, ± 0.5 to ± 2.0 spatial + 23 °C and + 80 °C only WK +10 to + 95 – 3 to + 94 10 to 98 ±1 to ± 3 in time ± 0.1 to ± 0.3 in time, ± 0.5 to ± 1.0 spatial 400 500 500 500 500 500 500

+ 23 °C / 50 % r. h. and + 95 °C / 50 % r. h. 3/N/PE AC, 400 V ±10 %, 50 Hz 10 21 64 1.4 570 11 19 66 2.7 650 16 29 69 2.1 725 23 33 72 3.5 940 26 38 73 3.0 1100 23 33 72 3.5 1050 26 38 73 3.0 1250

Performance data refer to + 25 °C ambient temperature (1) Change rate as per IEC 60068-3-5, measured in the supply air stream (2) At + 25 °C to + 90 °C, humidity to max. 90 % r. h. (3) Free field measurement as per DIN 45635, Part 1, accuracy class 2 (4) At a cooling water temperature of + 28 °C and temperature difference of 5 K, water temperature +12 °C to + 28 °C. We reserve the right to make any technical alterations.

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10 K/min
270/ 40/10 270 750 580 620 1780 865 1895 270/ 70/10 270 750 580 620 1780 865 1895 480/ 40/10 480 920 800 650 1980 1085 2480 480/ 70/10 480 920 800 650 1980 1085 2480 800/ 40/10 810 920 1100 800 1980 1385 2680 800/ 70/10 810 920 1100 800 1980 1385 2680 1300/ 40/10 1340 920 1100 1325 1980 1385 3205 1300 70/10 1340 920 1100 1325 1980 1385 3205 270/ 40/15 270 750 580 620 1780 865 1895 270/ 70/15 270 750 580 620 1780 865 1895 480/ 40/15 480 920 800 650 1980 1085 2480

15 K/min
480/ 70/15 480 920 800 650 1980 1085 2480 800/ 40/15 810 920 1100 800 1980 1385 2680 800/ 70/15 810 920 1100 800 1980 1385 2680 1300/ 40/15 1340 920 1100 1325 1980 1385 3205 1300/ 70/15 1340 920 1100 1325 1980 1385 3205

– 40 +180 12.5 10.0 6000 2000

– 70 +180 14.5 10.0 6000 6000

– 40 +180 12.5 10.0 8000 3000

– 70 +180 11.0 10.0 8000 8000

– 40 +180 12.0 12.0 8000 3000

– 70 +180 12.0 12.0 8000 8000

– 40 +180 11.5 12.0 8000 3000

– 70 +180 10.5 11.0 8000 8000

– 40 +180 16.0 16.0 8000 3000

– 70 +180 18.0 17.0 8000 8000

– 40 +180 18.0 16.0 8000 3000

– 70 +180 15.0 17.0 8000 8000

– 40 +180 18.0 16.0 8000 3000

– 70 +180 15.5 16.0 8000 8000

– 40 +180 17.0 16.0 8000 3000

– 70 +180 14.5 16.0 8000 8000

± 0.3 to ± 0.8 in time, ± 0.5 to ± 2.0 spatial + 23 °C and + 80 °C only WK +10 to + 95 – 3 to + 94 10 to 95 ±1 to ± 3 in time ± 0.2 to ± 0.5 in time, ± 0.5 to ± 1.0 spatial 400 400 500 500 500 500 500 500 400 400

± 0.3 to ± 0.8 in time, ± 0.5 to ± 2.0 spatial + 23 °C and + 80 °C only WK +10 to + 95 – 3 to + 94 10 to 95 ±1 to ± 3 in time ± 0.2 to ± 0.5 in time, ± 0.5 to ± 1.0 spatial 500 500 500 500 500 500

+ 23 °C / 50 % r. h. and +95 °C / 50 % r. h. 3/N/PE AC, 400 V ±10 %, 50 Hz 8 17 68 3.6 560 14 26 73 2.7 820 16 31 72 3.4 900 20 33 73 4.3 1050 28 41 73 4.2 1450 34 50 73 5.5 1600 28 41 73 4.2 1550 34 50 73 5.5 1850 12 20 70 4.6 560 16 31 73 2.7 835

+ 23 °C / 50 % r. h. and + 95 °C / 50 % r. h. 3/N/PE AC, 400 V ± 10 %, 50 Hz 18 25 72 4.0 950 24 43 73 5.5 1100 35 51 73 7.0 1500 44 63 73 8.0 1700 35 51 73 7.0 1650 44 63 73 8.0 1950

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Test systems for professionals. Test the best . . .

A complete line of systems is available offering test space volumes ranging from approx. 60 l to 1,500 litres, a working range from – 75 . . . + 180 °C and relative humidity values ranging from 10 . . . 98 % r. h. We also offer an extensive line of field-proven test systems specially for simulating exposure to weather, temperature shock, corrosion and long-time tests for application in research, development, quality control and production. Of course, Weiss – as one of the leading producers of environmental simulation systems world-wide – offers the entire spectrum of hightech test systems starting from a series of cost-effective test systems up to customized walk-in chambers and in-line systems. If it’s know-how, service and reliability that you are looking for – contact Weiss Umwelttechnik.
Technical Sales Offices
Berlin 13407 Berlin-Reinickendorf ? Flottenstrasse 58 Tel. (0 30) 40 99 05-10 ? Fax (0 30) 40 99 05-50 eMail: berlin@wut.com Hamburg 22459 Hamburg-Niendorf ? Sperberhorst 6 Tel. (0 40) 68 59 96 ? Fax (0 40) 68 52 91 eMail: hamburg@wut.com Hannover 30853 Langenhagen ? Walsroder Strasse 149 Tel. (05 11) 7 28 19-10 ? Fax (05 11) 7 28 19-30 eMail: hannover@wut.com Oberhausen 46045 Oberhausen ? Mülheimer Strasse 48 Tel. (02 08) 6 20 65-10 ? Fax (02 08) 6 20 65-20 eMail: oberhausen@wut.com Stuttgart 70567 Stuttgart-M?hringen ? Zettachring 10 Tel. (07 11) 90 02 45-10 ? Fax (07 11) 90 02 45-30 eMail: stuttgart@wut.com Nürnberg 90592 Schwarzenbruck ? Robert-Bosch-Strasse 15 Tel. (0 91 28) 92 37 55 ? Fax (0 91 28) 92 37 65 eMail: nuernberg@wut.com München 82166 Gr?felfing ? Wandlhamer Strasse 31 Tel. (0 89) 89 80 45-10 ? Fax (0 89) 89 80 45-30 eMail: muenchen@wut.com Leipzig 04105 Leipzig ? Tschaikowskistrasse 14 Tel. (03 41) 9 84 57-10 ? Fax (03 41) 9 84 57-30 eMail: leipzig@wut.com

Subsidiaries

Weiss Umwelttechnik Ges.m.b.H. A-1232 Wien ? Ober-Laaer Strasse 316 Tel. (01) 6 16 66 97 ? Fax (01) 6 16 66 97-13 weiss.umwelttechnik-wien@schunk-group.com Weiss Technik Belgium B.V.B.A. B-1770 Liedekerke Nijverheidszone ? Begijnenmeers 63 Tel. (0 53) 68 10 10 ? Fax (0 53) 68 10 20 e-Mail: sales@weisstechnik.be Weiss Technik AG CH-8802 Kilchberg ? B?ndlerstrasse 29 Tel. (01) 7 16 10 66 ? Fax (01) 7 16 10 76 e-Mail: info@weiss-technik.ch Weiss Technik France E.U.R.L. F-78955 Carrières sous Poissy 283, route d’Andrésy F-78304 Poissy Cedex ? B.P. 4015 Tel. (1) 34 01 11 00 ? Fax (1) 39 75 11 00 eMail: info@weissfr.com Weiss Technik Ltd. GB-Coleshill ? Buckinghamshire HP7 OLS The Old School House ? Luckings Estate Tel. (0 14 94) 43 43 24 ? Fax (0 14 94) 43 43 25 eMail: info@weisstechnik.co.uk Weiss Technik Italia S.r.l. I-20013 Magenta (Mi) ? Via Murri, 22 – 28 Tel. (02) 97 29 16 16 ? Fax (02) 97 29 16 18 eMail: info@weissitalia.it Weiss Enet Industrietechniek B.V. NL-4004 JP Tiel ? Morsestraat 8 Tel. (03 44) 67 04 00 ? Fax (03 44) 67 04 05 eMail: info@weissenet.nl Weiss Environmental Technology Inc. Menomonee Falls, WI 53051, USA W146 N9300 Held Drive Tel. (2 62) 2 53-87 30 ? Fax (2 62) 2 55-13 91 eMail: info@schunkgraphite.com

Weiss Umwelttechnik GmbH
Simulationsanlagen ? Messtechnik
35447 Reiskirchen-Lindenstruth/Germany ? Greizer Str. 41– 49 Telefon (0 64 08) 84-0 ? Telefax (0 64 08) 84-87 10 Internet: www.wut.com ? eMail: info@wut.com

China Representative Office Shanghai Weiss Technik Co.,Ltd
Room 12G, Aibo Building, 635 LingLing Road, Shanghai, 200030,P.R.C. Tel:(0 21)-54 59 21 20 . Fax: (0 21)-54 24 29 23 eMail:support@weisschina.com www.weisschina.com


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