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When measuring hazardous energy levels:
% p: ]7 Z3 o4 u: K& ]a) Should component open/shorts be considered when determining maximum energy
M: a2 B( p! ]: E. P0 |: s( blevels?4 C3 W! r3 c- }% C7 L
b) Should voltage tolerances per sub-clause 1.4.5 be used at the input power source?! d/ e- R8 P7 |$ A
APPLICATION GUIDELINE:7 I) a8 U* b$ ?* }/ P5 l
a) When determining maximum energy levels, component faults should not be
6 B- Z7 c& |" j6 ^( Iconsidered.% Z6 t+ v2 z: _' y2 i
b) Input power source voltage tolerances should only be considered when test results( B. T" v5 ~ ?* }- o4 w
are borderline pass/fail.) h* _. R/ h5 {/ k
RATIONALE:
: @5 i8 [7 C( ]7 T# U5 Q' ?* Qa) In its compliance statement, sub-clause 2.1.1.5 indicates the equipment should be
5 P' w: i* V0 u) n″operating under normal operating conditions.″7 e6 s- z9 `3 _0 a
b) Most energy hazard measurements are associated with a regulated secondary d.c.6 A5 c6 y+ i0 N
outputs, so in most cases input supply tolerances will not affect the measurements.
# N9 Y9 \; {! u$ u——P60950 2.1.1.5-1 |
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发表于 2012-2-22 19:37
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