[问答]

请问测量E4448A上的CW测试信号时，量程设置是否影响标记位置？

问答对人有帮助，内容完整，我也想知道答案 0 嗨，我正在E4448A上进行以下测试目标：测量14GHz的CW测试信号，各种量程设置，RBW设置为3.9KHz测试步骤：1。设置中心频率为14.906 GHz，跨度1MHz 2.探测器RMS，RBW = 3.9 KHz扫描时间使得uncal不会出现在屏幕上3.将测试信号（发生器）电平设置为-10 dBm @ 14.906 GHz，等待完全扫描4.按“标记” - >峰值搜索5.记录标记位置（y轴）在步骤4中获得6.重复步骤1-5，跨度为5MHz，12.5MHz，20MHz，25MHz，50MHz，100MHz，并增加扫描时间，使得uncal不出现在屏幕上（40秒）预期结果：标记位置不依赖于跨度实际结果：我得到下表，如您所见，标记位置似乎与我使用的跨度相关RBW = 3.9KHz SPAN Marker1位置1MHz -13.64 dBm 5MHz -16.37 dBm 12.5MHz -20.28 dBm 20MHz -22.32 dBm 25MHz -23.28 dBm 50MHz -26 dBm 100MHz -29 dBm为什么当我改变量程时标记峰值会移动？谢谢乔以上来自于谷歌翻译以下为原文 Hi, I am performing the following test on E4448A Objective: measure a CW test signal at 14GHz with various span settings and with RBW set to 3.9KHz Test Steps: 1. set centre frequency to 14.906 GHz, span 1MHz 2. detector RMS, RBW=3.9 KHz sweep time such that uncal does not appear on screen 3. set test signal (generator) level to -10 dBm @ 14.906 GHz, wait for complete sweep 4. press "marker"--> peak search 5. record marker position (y axis) obtained in step 4 6. repeat steps 1-5 with spans 5MHz, 12.5MHz, 20MHz, ,25MHz, 50MHz, 100MHz, and increase sweep time such that uncal does not appear on screen (40 Sec) Expected Result: marker position does not depend on span Actual Result: I got the following table, as you can see, the marker position seemed to be related to what span I used RBW=3.9KHz SPAN Marker1 Position 1MHz -13.64 dBm 5MHz -16.37 dBm 12.5MHz -20.28 dBm 20MHz -22.32 dBm 25MHz -23.28 dBm 50MHz -26 dBm 100MHz -29 dBm why did the marker peak move when I changed the span ? thanks Joe 0
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答案对人有帮助，有参考价值 0 嗨Joe - 很可能Yig Tuned Filter（YTF）的频率偏离其带宽的一半，您可以看到信号在预选器滤波器的裙边上下移动的效果。连接输入信号并在信号上放置标记，然后按[Amplitude]使预选器居中。然后查看[Amplitude]键以查看预选器必须调整多远才能使滤波器居中。如果预选器对于3 GHz至13.2 GHz的中心频率关闭超过15 MHz或对于13.2 GHz至26.5 GHz的中心频率关闭超过20 MHz，那么最好将仪器送入校准并请求服务中心运行预选器调整必须。尽管如此，PSA的规格要求您在进行测量前预先选择中心。问候 - 以上来自于谷歌翻译以下为原文 Hi Joe - Most likely the Yig Tuned Filter (YTF) is off in frequency by half its bandwidth and you are seeing the effect of the signal move up and down on the skirt of the preselector filter. Connect up your input signal and put a marker on the signal, then center the preselector by press [Amplitude] . Then look at the [Amplitude] key to see how far the preselector had to be tuned in order to center the filter. If the preselector is off by more than 15 MHz for center frequencies of 3 GHz to 13.2 GHz or of by more than 20 MHz for center frequencies 13.2 GHz to 26.5 GHz, then it would be good to send your instrument in for calibration and request the service center run the preselector adjustmust. Nevertheless, the specifications for PSA require that you preselector center before making a measurement. Regards -

2019-9-4 10:30:28 评论举报李欢