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EMC chamber
- Thread starter uppi_777
- Start date
Deep pockets.
Towards the end of the last century, my then employer had an anechoic EMC chamber installed; although only a 3m chamber (distance from EUT to antenna) the total cost including the instrumentation was of the order of half a million pounds. Given inflation, expect to pay around £1m now.
Towards the end of the last century, my then employer had an anechoic EMC chamber installed; although only a 3m chamber (distance from EUT to antenna) the total cost including the instrumentation was of the order of half a million pounds. Given inflation, expect to pay around £1m now.
May i know if you can give me insights into the minimum requirements for 3m exclusively only for Chamber (for Ex: Door, Honeycomb, Shielding attenuation, Penetration panels, filters...etc)
Although my employer had a 3m EMC chamber, as do many test facilities – I believe that EMC Standards specify a 4m chamber (to avoid close coupling effects), most appear to ignore this requirement.
Given the specialist nature of such a chamber’s construction, with ferrite shielding, EUT turntable, antenna rig, reliable systems control (without affecting EMC measurements) etc – the only sensible option is to have one built by persons experienced in such things.
If you are only interested in EMC emissions (and not immunity), you could consider a free field site, but even so such a facility is likely to cost around ½ a million pounds.
Given the specialist nature of such a chamber’s construction, with ferrite shielding, EUT turntable, antenna rig, reliable systems control (without affecting EMC measurements) etc – the only sensible option is to have one built by persons experienced in such things.
If you are only interested in EMC emissions (and not immunity), you could consider a free field site, but even so such a facility is likely to cost around ½ a million pounds.
Thanks for the info
the chamber will be constructed by the experts. Now i am collecting the minimum requirements which would need for the FAR chamber. My focus is on Immunity Tests
I’m no expert in EMC, having not worked in that speciality for more than 20 years. When I was testing, the upper frequency was limited to 1GHz, and the immunity signal only had a 1kHz fixed modulation.
I believe that the issue with the antenna close to the EUT related to magnetic emission effects, but going to a 4m chamber adds significantly to the cost – since no-one worries whether the chamber is 3m or 4m, it makes sense to go for the cheaper option.
A further problem with EMC testing is that the Standards change periodically, necessitating the purchase of new expensive equipment that can apply the required tests – and that is on top of the expensive annual calibrations.
I believe that the issue with the antenna close to the EUT related to magnetic emission effects, but going to a 4m chamber adds significantly to the cost – since no-one worries whether the chamber is 3m or 4m, it makes sense to go for the cheaper option.
A further problem with EMC testing is that the Standards change periodically, necessitating the purchase of new expensive equipment that can apply the required tests – and that is on top of the expensive annual calibrations.
