引用第9楼狼行成双于2010-08-06 17:49发表的 :9 P+ [0 @- W5 f3 |
样机通电（空载），再短路（此时的电压就是异常条件下的开路电压），然后拉负载
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8 Z* p; v$ p" @2 `6 [我也是用以上的方法，此時的負載，一般是指二次測的負載，如通訊埠去拉載直流3 k6 H+ J K" U! ]+ A$ e. J
# h" e- \5 W: ^. p0 y) r5 n3 C以下為 無限流保護裝置的測法; I2 c* r" X* Z. ]
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2.5 LIMITED POWER SOURCE MEASUREMENTS
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[ ] METHOD - Without An Overcurrent Protection Device -( C; P5 ]1 ^6 C' l! P3 y3 e
7 v# O& G5 n+ J4 r; jA sample of the [ power supply ] [ transformer, Model ____________________ ] [ Operator Accessible Connector ] was connected to _____ [ V ac, _____ Hz ] [ V dc ]. After each of the following output measurements, the values were compared with the Table 2B. : Q L" I. G; {, ]
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A. The open circuit voltage (Uoc), with all load circuits disconnected.
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B. The output current (Isc) after [ ] 5 [ ] 60 seconds of operation with the load adjusted to maintain the Isc current limit (maximum Isc per Table 2B is 8.0 A or 150/Uoc, as applicable. See Notes to Lab.) Output circuits other than the circuit under test were unloaded during the Isc measurements.
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C. The maximum output Volt Ampere (VA), after [ ] 5 [ ] 60 seconds of operation with the load adjusted to maintain the VA limit (maximum VA per Table 2B is 100. (See Notes to Lab.) Output circuits other than the circuit under test were unloaded during the VA measurement.$ L% S% C$ m; q$ R; \
' Z! X% p- z! ^5 y% E. d" v- D+ t(Note for A, B, C above: For product designs that require a small load in order to operate, the minimal load may be applied in order to measure the maximum output. The load used should be documented under “Comments.”)
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[ ] a linear or non-linear impedance limits the output in compliance with Table 2B.1 x, p5 i; x0 [' X' Y
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[ ] If a regulating network limited the output in compliance with Table 2B under normal operating conditions, then measurements (A), (B), and (C) were repeated under single fault conditions. The faults were placed in any part of the regulating network, including power supply pulse width modulation circuitry. |
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发表于 2011-7-20 12:11
