[问答]

未列出的电表错误代码E4419B

问答对人有帮助，内容完整，我也想知道答案 0 我正在使用带有8481A传感器的E4419B功率计。我正在测量一个简单FET的输出功率，一切顺利，因为我将输入功率从-25提高到0 dBm。增益为19 dB。引脚= 0，Pout = 19 dBm一切都很好。引脚= 1 dBm，Pout读取999.这是非常可重复的。传感器最高可达24 dBm，因此无法过载（错误-231）。有人见过这个吗？有什么想法正在发生什么？以上来自于谷歌翻译以下为原文 I am using an E4419B power meter with an 8481A sensor. I am measuring the output power of a simple FET and all goes well as I raise the input power from -25 to 0 dBm. The gain is 19 dB. Pin = 0, Pout = 19 dBm all is fine. Pin = 1 dBm, Pout reads 999. This is very repeatable. The sensor is good up to 24 dBm so it can't be overload (error -231). Has anyone seen this before? Any ideas what's going on? 0
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答案对人有帮助，有参考价值 0 您使用8481A从FET测量的信号是CW信号，还是对其进行了一些调制？这种调制可能会导致问题.8481A指定为+20 dBm，以进行精确测量。它将测量更高的电平（高达+23 dBm），但没有在那些更高级别指定。实际上，传感器的额定功率为300 mW平均值或15 W峰值而没有损坏，但它无法测量高功率时的实际功率水平。您需要设计用于测量高功率RF功率水平的高功率传感器。由于8481A指定的RF功率测量仅为+20 dBm（开销为+23 dBm）且功率水平高于未指定的功率水平，功率计设计为在功率传感器功率水平超出其最大功能时进入过载状态，在这种情况下，此传感器为+23 dBm。这就是为什么你看到'999'，即功率计的过载声明。这可以通过使用更高功率的传感器来处理，例如8481D或8481B。如果来自FET的平均RF功率仅为+19或+20 dBm，但RF上的调制高出3 dB，则传感器将看到峰值调制信号并导致功率计进入过载状态。通过当8481A / B / D传感器停产并被N8481A / B / DI取代时，希望这能解决您的问题。以上来自于谷歌翻译以下为原文 Is the signal you are measuring from the FET with the 8481A a CW signal, or does it have some modulation on it? This modulation can cause problems. The 8481A is specified to +20 dBm to make accurate measurements. It will measure levels higher (up to +23 dBm) but it is not specified at those poser levels. The sensor is actually rated for power levels of 300 mW aveage or 15 W peak without damage, but it can't measure the actual power levels at that high a power. You need high power sensors that are designed to measure RF power levels that high. Since the 8481A is specified for RF power measurements to only +20 dBm (with an overhead of +23 dBm) and power level higher than that are not specified, the power meter is designed to go into overload if the power sensor power level excheeds its maximum capability, in this case with this sensor +23 dBm. That is why you see the '999', that is the overload announcement from the power meter. This can be dealt with by using a higher power sensors, say a 8481D or 8481B. If the average RF power from the FET is only +19 or +20 dBm, but there is modulation on the RF that is 3 dB higher, the sensor will see the peak modulation signal and cause the power meter to go into overload. By the way the 8481A/B/D sensors are discontinued and are replaced by the N8481A/B/D. I hope this answers your questions.

2019-7-29 10:19:09 评论举报李建平