Mike et al Our EMC lab is audited annually by TUV to ISO 17025 and the company as a whole is audited annually by BSI and accredited to ISO 9001:2002. As we only do in-house testing the cost/benefit of full UKAS accreditation for the EMC lab isn't worthwhile. The concerns regarding calibration are: 1 That we have a quality system in place which ensures equipment is calibrated using traceable standards. 2 That we know when any piece of equipment was LAST calibrated and if, when it NEXT goes for calibration whether it was found to be outside the manufacturers specification or not. If it is found to be outside the manufacturers specification then any compliance work performed with that piece of equipment since the LAST calibration will be repeated. Thus the "cal due" date is arbitrary. It is essential however that you perform checks to ensure the equipment is still functioning at regular intervals - e.g. on a regular basis I measure the voltage generated by our transient generator and use a reference source to ensure our receiver + cables + antenna + room are working. Trend analysis is also performed.
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