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zt012359 发表于 2013-9-30 13:34 + j( F/ f! s) V) x
哥! UL8750有8.6? 为什么我的只有8.4啊 我的是台湾翻译的 我的有问题吗还是没有更新的? . H f8 x. Y1 D7 [/ j
估计标准错误无疑, + R" d \, W, n) w! o( a( {, z0 O) }
8.6 50-Watt point power measurement test+ W' h$ Q5 ~, E- u
8.6.1 To determine the point beyond which any circuit is unable to deliver more than 50 W of available6 x+ x2 u& Z& ^- p) b. h# |" T& R
power, a wattmeter and an adjustable external load resistor are to be arranged as illustrated in Figure 8.1. Power limitation is permitted to be accomplished either by the inherent design of the circuit (per 8.6.2), by the opening of a circuit component (per 8.6.3), or by the opening of a protective device (per 8.6.4).
0 }8 s2 R3 v y8.6.2 The external adjustable load resistor is to be initially set for its maximum resistance. The adjustable$ u3 q5 Y6 d6 t
resistance is then to be reduced gradually to the point of maximum delivery wattage as indicated by a4 H% r* @9 E7 `6 [- G8 h* J, K
peak reading on the wattmeter.
! \2 i. ?# S8 ^3 R% ^8.6.3 For a circuit without a designated current limiting device, a circuit component that opens in less than 1 minute at any power delivery level less than 50 W and that precludes delivery of 50 W for more than one minute is considered to effectively limit the circuit output to less than 50 W, if the test can be repeated two additional times on new samples with comparable results.7 @( Z. f: [: y' W
8.6.4 For a circuit with a designated current limiting device, a closed shorting switch is to be connected
$ ?/ q# s& O3 D( |4 ], o& A5 \across the current limiting device and the adjustable resistance is then to be reduced to result in a power dissipation of exactly 50 W as indicated by the meter. The switch across the current limiting device is then to be opened and the time required for the device to open is to be recorded. A current limiting device that opens the circuit in less than 1 minute is considered to effectively limit the circuit output to less than 50 W. |
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