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When measuring hazardous energy levels:
& q) D( c+ C R8 fa) Should component open/shorts be considered when determining maximum energy
+ {7 O) l) ]. _8 {4 I" O; i6 Jlevels?" O* R- k6 R1 p1 y3 c- |0 d/ \) J
b) Should voltage tolerances per sub-clause 1.4.5 be used at the input power source?/ \" X! W: C A! M S: \
APPLICATION GUIDELINE:9 {; ^9 w0 W5 n' @+ f7 B
a) When determining maximum energy levels, component faults should not be# d- K/ P* F! e
considered.% y! @; Q6 J$ \3 ?- G2 o1 h
b) Input power source voltage tolerances should only be considered when test results4 z% i! w7 r+ w5 ^3 E- D3 W
are borderline pass/fail.
1 V8 Y* k* K8 yRATIONALE:
+ @# _- Z" p2 S6 U1 k9 Va) In its compliance statement, sub-clause 2.1.1.5 indicates the equipment should be
) J2 r, R3 S7 w2 }″operating under normal operating conditions.″
8 g* }1 o$ ^8 y( M5 ub) Most energy hazard measurements are associated with a regulated secondary d.c.
, F4 w) {' a+ F t) w5 }outputs, so in most cases input supply tolerances will not affect the measurements.; d8 ^: D* v2 m. e; ]: G% T& `+ i! C
——P60950 2.1.1.5-1 |
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发表于 2012-2-22 19:37
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