E9300A H25不确定度怎么获得

你有没有得到过支持的答复？
我也许没有太多运气，但也许那是因为我是Keysight的内部人员。
： - / /我几年前开发了自己的不确定度计算器。
它支持各种Hxx选项，但我还没有为USB传感器更新它。
我已经连接了计算器，方便地设置为H25。
计算功率传感器的不确定性可能非常复杂，但主要因素通常是校准因子不确定度，传感器/ DUT不匹配，线性度和噪声。
打破这些因素：*校准因子不确定性 - 这将随频率而变化，我们根据校准报告后接收的校准报告使用实际值。
但是，您可以将功率传感器数据表中显示的值用作合理的近似值。
（使用来自实际校准报告的值具有通常会降低我们报告的不确定性的优势。）*传感器/ DUT不匹配 - 您的不确定性将根据传感器与被测设备之间的匹配程度而有所不同。
同样，我们使用来自校准报告的传感器的测量匹配，这将优于数据表中列出的传感器规格。
至于DUT不匹配 - 您将不得不尝试确定它是什么并输入电子表格中的值。
电子表格假设一个典型值（因为我测量它的DUT通常作为典型值存在于数据表中，而不是硬规格。）*线性度 - 这将根据测量的功率水平和功率传感器规格计算
。
*噪声 - 对于“更高”的功率电平，比如范围的上半部分，这可以忽略不计，但可以成为传感器功率范围底部的主要不确定因素。
电子表格要求您手动输入滤波器长度（这会降低噪声不确定性） - 它不会根据功率和分辨率计算自动滤波器设置。
如果您在自动设置上测量较低功率级别，则必须查看手册中的内容。
（搜索“设置测量平均值”）计算器按“原样”提供，可能存在错误。
实际上，我发现H25的线性值很差并且纠正了这些。
它也可能不是最容易使用的，因为它是为我自己开发的。
但它确实有Hxx传感器，直到（或者如果）是德科技支持更新“官方”电子表格，您可能会发现它很有用。
你有任何问题请联系我。
弗朗西斯小



     以下为原文

  Did you ever get a response from support? I haven't had much luck maybe, but perhaps that's because I'm internal to Keysight. :-/

I developed my own uncertainty calculator several years ago. It supports the various Hxx options, but I have not yet updated it for the USB sensors. I've attached the calculator, conveniently set to the H25. Calculating power sensor uncertainty can be quite involved, but the main contributors are usually the calibration factor uncertainty, sensor/DUT mismatch, linearity, and noise. Breaking these down:

* Cal factor uncertainty - this will vary with frequency, and we use the actual values based on the calibration report received after we get our sensors calibrated. However, you can use the values that appear in the datasheet for the power sensors as a reasonable approximation. (Using the values from an actual cal report has the advantage of usually reducing our reported uncertainties.)
* Sensor/DUT mismatch - your uncertainty will vary based on how good a match you have between the sensor and the unit under test. Again, we use the measured match of the sensor from our calibration reports, which will be better than the sensor specifications listed in the datasheet. As for the DUT mismatch - you will have to try to determine what that is and enter in a value in the spreadsheet. The spreadsheet assumes a typical value (since for the DUTs I measure it is usually present on the datasheet as a typical, as opposed to a hard specification.)
* Linearity - this will be calculated based on the measured power level and the power sensor specifications.
* Noise - for 'higher' power levels, say the upper half of the range, this will be negligible, but can become the dominant uncertainty factor at the bottom of a sensor's power range. The spreadsheet requires you to manually enter the filter length (which reduces noise uncertainty) - it does not calculate the auto filter setting based on power and resolution. If you are measuring lower power levels on auto settings, you'll have to look in the manual for what they are. (Search for "Setting Measurement Averaging")

The calculator is offered "as-is", there may be errors in it. Indeed, I discovered that the linearity values for the H25 were bad and corrected those. It also may not be the easiest to use as it was developed for my own use. But it does have the Hxx sensors, and until (or if) Keysight support ever updates the 'official' spreadsheet you may find it useful. Contact me if you have any questions.

  Francis Small

附件

• Absolute Power Sensor Uncertainty.xlsx75.2 KB