UL60950 data sheet 学习系列（二．１ ｜ 二．２）

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二．１
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1.5.7.4, 2.4.2 – DOUBLE OR REINFORCED INSULATION BRIDGED BY COMPONENTS

This test was conducted after Electric Strength Testing of the insulation.

METHOD

The unit was connected to ___ [V ac, __ Hz ] [V dc]. An IEC leakage current meter described in Annex D of UL 60950 and a switch were connected with the bridging component __CY1__ , The measured current was recorded.

Measuring instrument used for test:

Annex D.1 – Simpson 228

              [ ] Other__________________

[ ] Annex D.2 – [ ] Simpson 229 -2

              [ ] Other__________________

Measurements were made under both normal and single fault conditions as notes below.

Y1 Capacitors were subjected to single fault conditions.

RESULTS

Location ( Component ) :   CY1

Condition	MIU
Normal

The circuit”s available current [ complied ] [ did not comply ] with the current limits of 0.5mA rms ( 0.7 mA pk)

Comments:CY1 = 2200pF

NOTES TO LAB:

1. The current measured through the bridging component and the Annex D measuring instrument shall not exceed 0.5 mA ( 0.7 mA pk).

NOTES TO ENGINEER:

1. Components subjected to single component fault conditions include IEC 384 -14, U, Y, Y2 or Y4 capacitors, or resistors which bridge double or reinforced insulation. IEC 60384 -14, Y1 capacitors were not faulted.

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二．2

1.5.7.4, 2.4.2 – DOUBLE OR REINFORCED INSULATION BRIDGED BY COMPONENTS

This test was conducted after Electric Strength Testing of the insulation.

METHOD PART1

The unit was connected to ___ [V ac, __ Hz ] [V dc]. A 2000Ω non-inductive resistor and a switch were connected between the load side of the bridging component __CY1__ , and [ protective earth ] [ neutral ]. A storage oscilloscope was connected across the points under consideration. The switch was closed and the following values were recorded:

           V p – Peak

           V dc – dc Voltage

           A p – Peak current = V p/2000

           dc – dc current = V dc/2000

           kHz – Circuit frequency in kilohertz

  In addition, a photograph or the waveform was made.

Measurements were made under both normal and single fault conditions as notes below.

Y1 Capacitors were subjected to single fault conditions.

RESULTS PART1

Location ( Component ) :   CY1 to [ protective earth ] [ neutral ]

Condition	Volts , peak	Volts , dc	mAp	mA ,dc	Frequency kHz
Normal

The circuit”s available current [ complied ] [ did not comply ] with the current limits of a Limited Current Circuit.

Comments:

Alexsong

此测试属于LCC测试项目。

safty10

Lcc 限流电路判定

329485466

LCC 测试一个北美的要求，一个欧洲的要求
6 a- Z) ^* Y  Q9 ^- x7 y0 s测试时输入电源的频率对测试有很大的影响，注意选对AC source的频率

tjuking

第二个是要求把2k电阻一段串到电容次级另一端接地线（3pin）或零线（2pin）？