DSH 753（IEC 60065/IEC 61010-1）殘余電壓測試要求

Subject: Capacitor discharge voltage measurement

Question:

The standards referenced include a test commonly referred to as a plug discharge or capacitor discharge test that involves disconnecting the product under test from the mains and measuring the residual voltage across a capacitor(s) at a specified time. The intent in each of the referenced standards is the same – measure the maximum voltage obtainable at the time specified.

(1) Each standard has a slightly different description of how the mains disconnect is made, but the intent is to disconnect at the highest voltage possible in the AC power cycle. With the advent of electronic voltage sensing switches, it is possible to disconnect at the peak voltage in the AC cycle. Using this procedure seems to be within the intent of the standards and would result in more consistent and repeatable results. Is it acceptable to perform the test this way?

(2) Good laboratory practice dictates that the voltage should be measured with a high input impedance voltmeter. For this test, some standards require the use of a voltmeter with an input resistance of 100 M 1 ± 5 M 1 in parallel with an input capacitance of 25 pF or less. For more consistent and repeatable results should this type of meter always be used for this type of test?

Decision:

(1) Yes, this method should always be used for these tests within the CB Scheme.

(2) Yes, a meter with the stated input impedance should always be used for these tests within the CB Scheme.

問題：

所引用的標準包括通常稱為插頭放電或電容器放電測試的試驗，該試驗涉及將被測產(chǎn)品與電源斷開，并在指定時間內(nèi)測量電容器兩端的殘余電壓。每個參考標準的目的都是相同的：測量指定時間的最大電壓。

（1）每個標準對如何斷開電源的描述略有不同，但目的是在交流電源的最高電壓下斷開。隨著電子電壓感應開關(guān)的出現(xiàn)，可以在峰值電壓下斷開連接。這種情況似乎符合標準的意圖，并且會產(chǎn)生更加一致和可復現(xiàn)的結(jié)果。以這種方式進行試驗是否可以接受？

（2）規(guī)定應使用高輸入阻抗的電壓表測量電壓。對于這項試驗，某些標準要求使用輸入電阻為100MΩ±5MΩ與輸入電容為25pF或更小的電壓表。為了獲得更加一致和可復現(xiàn)的結(jié)果，是否應始終使用此類型的儀表用于試驗？

決定：

（1）是的，該方法應始終用于CB試驗。

（2）是的，在 CB 試驗中應始終使用具有規(guī)定的輸入阻抗的儀表。

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