[问答]

U1733C电容测试问题

1744 电容

问答对人有帮助，内容完整，我也想知道答案 0 我有一个新的U1733C，正在测试一些Nichicon Audio（Muse系列）电解电容，即470uF 25V +/- 20％版本。这些是优质音频电解。在测量期间，他们大致测量如下：100 Hz：428uF（规格内），411uf @ 1kHz - 然而，在10kHz时，LCR测量仪测得“OL”---设备无法解析电容。现在，我我知道电解质在非常高的频率下表现不佳，但10 kHz不是“非常高” - 特别是对于音频级电解。我很困惑为什么在10kHz时没有接收到电容读数？有关正在发生的事情的任何建议吗？相位太远，以至于在这个频率下它甚至看起来都不像电容器那样。我从同一批次中测试了10个 - 并且所有表现都相似。超过1 kHz时无法读数。提前感谢您的想法。格雷格。以上来自于谷歌翻译以下为原文 I have a new U1733C and was testing some Nichicon Audio (Muse series) Electrolytic capacitors, namely, 470uF 25V +/- 20% versions. These are premium-grade audio electrolytics. During the measurements, they measured approximately as follows: 100 Hz: 428uF (within spec), 411uf @ 1kHz -- however, at 10kHz, the LCR meter measured "OL" --- the device could not resolve the capacitance. Now, I'm aware that electrolytics don't do well at very high frequencies, however, 10 kHz isn't "very high" -- especially for audio-grade electrolytics. I'm puzzled why I would receive no capacitance reading at 10kHz? Any suggestions as to what's happening? The phase is so far off that it doesn't even appear to be acting as a capacitor at this frequency. I tested 10 from the same batch -- and all behaved similarly. No readings were possible past 1 kHz. Thanks in advance for your ideas. Greg. 0
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答案对人有帮助，有参考价值 0 作为另一个U1733C用户（与安捷伦没有任何关系），您的问题引起了我的好奇心。简短的回答可以在操作手册第77页的表格中找到。事实证明，满量程电容限制在120 Hz以上下降。在1 kHz时，最大C为2000 uF（2 mF），10 kHz - 200 uF，以及100 kHz - 20 uF。因此，您只能使用U1733C测试470 uF电容至1 kHz。我是U1733C的忠实粉丝。我经常做的一个测量，平衡反绕线传感器线圈用于质子磁力计（我们的地磁观测项目，链接：http：//www.gellerlabs.com/PMAGThoughts.htm），现在我有一个更容易。虽然有点令人惊讶，但在这个价格范围内的仪器有一些限制是完全合理的。在这个新的手持式生产线之前，安捷伦高质量的LCR仪表价格高达数千美元，远远超出了大多数家庭和许多小型商业电子实验室的预算。但为何限制？我的帖子的这一部分仅基于观察和测量。我发布了一条包含数据的说明，链接：http：//www.gellerlabs.com/Agilent_U1733C.htm \| Agilent U1733C，10 kHz和100 kHz的电容测量。 U1733C似乎使用正弦波测试方案，可能是某种阻抗平衡技术，阻抗分配器或阻抗桥。通过10kHz，高于约200uF，信号幅度（用hp 3400A TRMS交流电压表测量）似乎在约1mV AC以下下降。看来，低于约1 mV，U1733C无法进行可靠的测量和/或被编程为不进行测量（可能是因为信号电平太低而无法进行精确测量），并且仪表显示“OL”。如果“OL”的阈值是在固件中编程的，无论您正在测试什么类型的C，或者它有多好，在第77页操作范围之外，您将获得“OL”或不是a的测量有效的C读数（例如，使用Nichicon VX（M）1,000 uF 63V 85c电解电容，在100 kHz时，我们得到“-5.863 uF”的读数。也许显示器不是“OL”，因为我们的hp 3400A表示测试电压为1.09 mV？）尽管有其局限性，我仍然对这种仪器非常满意。以上来自于谷歌翻译以下为原文 As another U1733C user (no affiliation with Agilent), your question peaked my curiosity. The short answer is found in the table on page 77 of the operating manual. It turns out the full scale capacitance limits drop off above 120 Hz. At 1 kHz max C is 2000 uF (2 mF), at 10 kHz - 200 uF, and at 100 kHz - 20 uF. Therefore you can only test your 470 uF capacitor to 1 kHz with a U1733C. I am a huge fan of the U1733C. One measurement that I do routinely, balancing counter-wound sensor coils for a proton magnetometer (our geomagnetic observatory project, Link: http://www.gellerlabs.com/PMAGThoughts.htm ) is so much easier now that I have one. Although a little surprising, it is completely reasonable that an instrument in this price range has some limitations. Before this new hand held line, an Agilent quality LCR meter cost several thousand dollars, and was way beyond the budget of most home and many small business electronics labs. But why the limitation? This part of my post is based only on observation and measurement. I posted a note with data, Link: http://www.gellerlabs.com/Agilent_U1733C.htm \| Agilent U1733C, Capacitance Measurements at 10 kHz and 100 kHz. The U1733C appears to use a sine wave test scheme, perhaps some sort of impedance balancing technique, impedance divider, or impedance bridge. By 10 kHz, above about 200 uF, the signal amplitude (measured with a hp 3400A TRMS AC voltmeter) appears to drop off below about 1 mV AC. It appears, that below about 1 mV, the U1733C can no longer make reliable measurements and/or is programmed to not make measurements (presumably because the signal level is too low for an accurate measurement), and the meter displays "OL". If the threshold for "OL" is programmed in firmware, no matter what type of C you are testing, or how good it is, outside of the page 77 operating envelope, you will get an "OL" or a measurement that is not a valid C reading (for example, with a Nichicon VX(M) 1,000 uF 63V 85c electrolytic capacitor, at 100 kHz, we got a reading of "-5.863 uF". Perhaps the display was not "OL" since our hp 3400A indicated a test voltage of 1.09 mV?) I am still very happy with this instrument, despite its limitations.

2019-5-29 11:34:56 评论举报陈小鸥