[问答]

435B-K05输出不确定性

问答对人有帮助，内容完整，我也想知道答案 0 我的实验室讨论了测量功率计参考输出的问题。我使用432A和478A-H76，或Tegam 1806或1830A以及热敏电阻安装座来测量它们。我的一些同事认为，我们可以通过采用8482A和E4418B以及将435B-K05的输出结果与UUT功率计的参考输出进行比较来准确测量输出。我反对他们的方法的理由是，通过两次测量，不匹配不确定度和仪表误差不确定性将加倍，更不用说必须包括435B-K05输出的不确定性。他们说，由于这是一个相对测量，我们在测量中必须考虑的是435B-K05的输出不确定性。你怎么看？我们需要以这种或那种方式解决这个问题。以上来自于谷歌翻译以下为原文 There is a discussion at my lab about measuring power meter reference outputs. I measure them using a 432A and a 478A-H76, or a Tegam 1806 or 1830A and a thermistor mount. Some of my associates argue that we could measure the output just as accurately by taking an 8482A and an E4418B and comparing the output results of the 435B-K05 to the UUT power meter's reference output. My reasons against their approach is that by taking two measurements the mismatch uncertainty and instrumentation error uncertainty will double, not to mention the uncertainty of the 435B-K05's output has to be included. They say that since it is a relative measurement all we'd have to consider in the measurement is the 435B-K05's output uncertainty. What do you think? We need to put this issue to rest one way or another. 0
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答案对人有帮助，有参考价值 0 435B-K05由HP /安捷伦设立，作为无法承受热敏电阻安装方法和/或铷/铯标准或任何纪律振荡器和/或不需要精确度要求的实验室的经济三级标准。主要是当天的一些军事实验室和较小的校准实验室，用于远程现场使用。它基本上是一台10811A石英OCXO和435功率计的校准器。这两个项目通过下一个梯队标准进行校准，基本上在50 MHz时1 mW和频率稳定性每天5 x 10-10的精度为+/- 1.2％。其中的每一个都可以通过更新的不确定性和数据历史来改进。是的，传输功率传感器的VSWR（磁场/相位），传感器的可重复性，K05单元的源VSWR，所用仪表的基本传输可重复性和热漂移会增加您的功率传输不确定性。必须计算这些以确定您新的测量不确定度。对于VSWR低于1.01 @ 50 MHz的质量传感器，不确定性的增加将是最坏情况下的+/- 0.3％。以上来自于谷歌翻译以下为原文 The 435B-K05 was set up by HP/ Agilent as a econical tertiary standard for laboratories that could not afford the thermistor mount method and/or rubidium/cesium standards or any disciplined oscillator and/or didn't need that accuracy requirement. Mainly some military labs back in the day and smaller calibration laboratories for field use in remote locations. It was basically a 10811A Quartz OCXO and calibrator from a 435 power meter. The two items were calibrated by the next echelon standards and basically had an accuracy of +/- 1.2% for 1 mW @ 50 MHz and 5 x 10-10 per day for frequency stability. Each of these could be improved with newer uncertainties available and data history. Yes, your power transfer uncertainties would increase by the VSWR of the transfer power sensor (mag/phase), repeatability of the sensor, source VSWR of the K05 unit, basic transfer repeatability of the meter being used and thermal drift. Those would have to be calculated in to ascertain your new uncertainty of measurement. With a quality sensor with a VSWR lower 1.01 @ 50 MHz your increase in uncertainty would be approximately +/- .3% worst case.

2019-8-2 14:38:59 评论举报张英