Hello All According to ANSI 63.4: 2014 Clause 4.7.3 "Standard gain horns need not be periodically recalibrated, unless damage or deterioration is suspected or known to have occurred. If a standard gain horn is not periodically recalibrated, its critical dimensions (see IEEE Std 1309-2005) shall be verified and documented on an annual basis." Can anyone point me in the direction of the clause in IEEE Std 1309-2005 which mentions critical dimensions? Thanks in advance.
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