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!