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Tester Aims for Zero Defects When Manufacturing PCBs
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ed, immediately shows where in the board it is located. Boundary-scan technology was
formulated in the mid-1980s as a practical means of checking PCBs for errors and locating those errors. Developed by Philips Research and refined by a group of industry compa- nies working as the Joint Test Action Group (JTAG), boundary-scan meth - odology became the international JTAG standard as IEEE Standard 1149.1 (1990).
Electronics Production Equipment
The Ersa i-CON VARIO 4 multi-channel station with 4 professional tools for highest demands.
World premiere of the new selective soldering system Ersa SMARTFLOW 2020!
Bed of Nails Testing Prior to boundary-scan testing,
JT5705 mixed-signal JTAG tester.
production-line PCBs had been tested using “bed-of-nails” approaches and mechanical or automatic conveyers, with measurement equipment mech - an ically and electronically connected to a PCB under test. Systematic test- ing was made possible by physically connecting the bed of nails, to which the measurement equipment was con- nected, to a PCB. This was not only expensive, but also no longer suffi- cient for the new PCB technology that was becoming more commonplace at the time, namely surface-mount
Boundary-scan approaches can not only isolate
defective PCBs, but also identify the location of the defect.
devices (SMDs). In order to take the next steps in the miniaturization of the electronics, more —and smaller — components were needed on the cir- cuit board. This was only possible by no longer pricking into the board, but by soldering onto it. That’s SMD tech- nology. The JTAG/boundary-scan ap -
new!
Low Budget High Technology!
Technical Highlights i-CON VARIO 4
Hot air iron i-TOOL AIR S for contactless energy transfer during soldering & desoldering
Efficient soldering with the strong i-TOOL
Precise desoldering of finest SMT elements with the desoldering tweezer CHIP TOOL VARIO
Safe and easy desoldering of THT components with the new ergonomic X-TOOL VARIO
new! Technical Highlights SMARTFLOW 2020
Individual user interfaces for easiest machine operation
Drop jet fluxer for precise flux application Electromagnetic pumping system 20“ x 20“ board capability Top and bottom preheating
High availability due to offline programming capability
Optimized maintenance position for shortest downtimes and lowest TCOs
proach makes it possible to test SMD circuit boards effectively and inex- pensively. In essence, with bound- ary-scan methods, integrated circuits (ICs) with boundary-scan compatibil- ity have a serial interface dedicated for test data. That serial interface makes it possible to access every package pin on an IC and perform measurements on that pin. This also makes JTAG suitable for component programming and software debug- ging. As a matter of fact, most PCB developers are familiar with the JTAG/boundary scan because of this. That you can use the same interface for testing is something a lot of peo- ple don’t know. This is due in part to the fact that testing is not taught anywhere; you learn it in the busi- ness world.
Global Added Value The JTAG test method employs
a straightforward application of boundary-scan methods to check PCBs. A PCB to be tested includes serial data input and output ports and ICs with boundary-scan regis- ters. The signal path makes it possi- ble to access all pins on the PCB to be tested and, consequently, determine whether solder connections are good or not. Quite simply, a serial input signal is fed to the board and checked at the output. If something is wrong with the output signal, the testing process can be fine-tuned to deter- mine very precisely which area of the PCB contains the defect. Test equipment from JTAG
For more information please contact:
Pam Gnacinski Ersa North America 920-892-9245
pam.gnacinski@
kurtzersa.com
Ersa North America, Inc. Plymouth, WI 53073
info-ena@kurtzersa.com www.kurtzersa.com
www. k u r t z e r s a . c om See at NEPCON South China, Booth A-1P35
Technologies, which originated in 1993 from a buy-out from Philips, automates the boundary-scan test process. Our products make detect- ing and locating errors easier and more efficient. This reduces the need for expensive employees who spend a day or so figuring out where the error is on a board.
Continued on next page
August, 2015
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