[问答]

请问是否有未报告的负担影响34401A读数？

问答对人有帮助，内容完整，我也想知道答案 0 我使用34401A s / n SG41019123进行调整并遇到了一个有趣的问题。我正在调试测试点的直流电压为.9800V +/-。0005V。 34401A读取.97910V。自从阅读安捷伦DVM论坛以来，我开始仔细检查34401A测量。在调节电压之前，我使用3458A测量DCV并读取.980071V。我将34401A imp更改为> 10G，读数更改为.98009V。我有一个方便的Fluke 5700A，所以我将.9800VDC连接到3458A并显示.9799995V; 34401A @ 10Mohm读取.98002V; 34401A @> 10G读取.98002V。是否有未报告的负担影响34401A读数？安捷伦技术支持或产品工程师是否会查看此论坛并对这些条目做出回应？以上来自于谷歌翻译以下为原文 I was using a 34401A s/n SG41019123 to perform an adjustment and encountered an interesting problem. I was adjusting a DC voltage at a testpoint for .9800V +/-.0005V. The 34401A read .97910V. Since reading the Agilent DVM forum, I've started to double check the 34401A measurments. Before adjusting the voltage, I used a 3458A to measure the DCV and it read .980071V. I changed the 34401A imp to >10G and the readings changed to .98009V. I had a Fluke 5700A handy, so I connected .9800VDC to the 3458A and it displayed .9799995V; the 34401A@10Mohm read .98002V; 34401A@>10G read .98002V. Is there an unreported burden affecting the 34401A readings?? Does Agilent Tech Support or product engineers look at this forum and respond to these entries too? 0
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答案对人有帮助，有参考价值 0 我是安捷伦技术支持工程师。如果我理解正确，34401A从Fluke 5700校准器读取0.98002V设置为0.9800。如果将34401设置为10 PLC积分时间且自动调零开启，则这符合精度规格。对于输入阻抗设置为10 Mohm和> 10 Gohms，它读取相同的内容。但是当你将输入阻抗增加到> 10 Gohms时，你的DUT的电压读数从0.97910V变为0.98009V。如果我们假设3458A的0.980071V读数是正确的，这意味着在DUT输出阻抗上下降971 uV，计算出9.9 Kohm。 Fluke 5700输出阻抗非常低，因此无论输入阻抗设置如何，它都不会影响34401A的读数。 3458A上电输入阻抗> 10 Gohm。它可以设置为10 Mohm。在10 Mohm设置下，您应该看到相同的电压读数变化。以上来自于谷歌翻译以下为原文 I am an Agilent tech support engineer. If I understand correctly the 34401A read 0.98002V from the Fluke 5700 calibrator set to 0.9800. If this is with the 34401 set to 10 PLC integration time with autozero on, this is within the accuracy specifications. It read the same for the input impedance set to 10 Mohm and >10 Gohms. But with your DUT the voltage reading went from 0.97910V to 0.98009V when you increased the input impedance to >10 Gohms. If we assume that the 0.980071V reading from the 3458A is correct, this means that 971 uV is dropped across the DUT output impedance and which calculates out to be 9.9 Kohm. The Fluke 5700 output impedance is very low so it does not affect the 34401A reading regardless of the input impedance setting. The 3458A power on input impedance is >10 Gohm. It can be set to 10 Mohm. At the 10 Mohm setting , you should see the same voltage reading change.

2019-7-12 16:27:48 评论举报郝汉