IEEE C63.16-1993 pdf free.American National Standard Guide for Electrostatic Discharge Test Methodologies and Criteria for Electronic Equipment.
IEEE C63.16 Air breakdown at a fixed distance between arcing electrodes is approximately proportional to atmosphericpressure and inversely proportional to absolute(K) temperature. Therefore,when testing EUTs for airbreakdown (external or internal with either test method), the ESD test voltage level should be changed toreflect the test equipmment specification and the environmcntal test conditions. Typically, air breakdown atsca level will be about 40% higher than at 3000 m.Failure to change the test voltage to account for pressurevariation will create site-to-sitc immunity variations in the EUT air breakdown valucs.
The ambient electromagnetic conditions should be such as not to influence the results of this test.
Care should be exercised when selecting a site to perform ESD testing.The ESD impulse produces a broadspectral distribution of cnergy, and these emissions may cause damage or malfunction of unprotectedequipment in the immediate area. Also, other equipment and activity in the immediate arca can interfere withthe ESD test. The ESD test site, therefore, should be located in an arca that is of sufficient size to minimizcinterference.
Accordingly, it is recommended that a clear-area radius of at least 1 m be provided around the EUT and toany other metallic structure,including walls,so as not to impact the ESD test. Where possible, the EUTshould be placed in a dedicated room with clectrical isolation from unrelated equipment.Shielded rooms arenot recommended for use as ESD test sites because of the possibility of creating standing waves that mayaffect the test results.
A GRP of sufficient size to providc a continuous reference for the EUT, ESD simulator, and operator shouldbe provided as part of the test site. The GRP on the floor is cxtended beyond the edges of the EUT at lcast0.5 m for equipment up to 1 m in height，as well as for a tabletop test. To capturce all edgc effects forequipment over 1 m in height, the GRP should extend beyond the EUT at least 50% of the height of theEUJT.An optional insulator, not to exceed 5 mm in thickness, may be placed over the GRP.The GRP should be connected to the protective grounding system. Local safety regulations should always be met.See 7.4.1for EUT ground conncctions.IEEE C63.16 pdf download.