Inside Apple’s EMC Lab

Macworld was invited inside Apple’s EMC test lab for a tour – the first time journ­al­ists have been per­mit­ted into this area. This art­icle looks at what Apple does to make sure their products meet EMC design require­ments. Testing indus­tri­al equip­ment is often sim­pler that this, and you don’t need to buy your own labs to do it. Are your machine designs com­pli­ant? Would you know if they

Macworld was invited inside Apple’s EMC test lab for a tour – the first time journ­al­ists have been per­mit­ted into this area. This art­icle looks at what Apple does to make sure their products meet EMC design require­ments. Testing indus­tri­al equip­ment is often sim­pler that this, and you don’t need to buy your own labs to do it. Are your machine designs com­pli­ant? Would you know if they weren’t?

Interlocked gate testing

Did you know that inter­locked gates require stop­ping per­form­ance test­ing?

Machinery needs to be able to stop in the time it takes a per­son to open the guard and reach the haz­ard. If the dis­tance from the guard open­ing to the haz­ard is short enough that a per­son can reach the danger point before the haz­ard can be con­trolled, the guard is use­less. The res­ult­ing situ­ation may be worse

Did you know that inter­locked gates require stop­ping per­form­ance test­ing?

Machinery needs to be able to stop in the time it takes a per­son to open the guard and reach the haz­ard. If the dis­tance from the guard open­ing to the haz­ard is short enough that a per­son can reach the danger point before the haz­ard can be con­trolled, the guard is use­less. The res­ult­ing situ­ation may be worse than not hav­ing a guard because it’s pres­ence leads to a false sense of secur­ity in users.

Test the stop­ping time of guarded haz­ards and make sure that guards are far enough away from the danger zone to be effect­ive. For more on stop­ping per­form­ance require­ments, see CSA Z434, EN 999 (soon to be replaced by EN 13855:2010), and in the USA, 29 CFR 1910.217(h)(9)(v).

Download ISO Standards 
Download IEC stand­ards, International Electrotechnical Commission stand­ards.
Download BSI Standards (British Standards Institution)
Download ANSI stand­ards

Need help with stop­ping per­form­ance test­ing? Contact us!