使用功率传感器运行源功率校准时在25GHz左右的频率下失败

你有测试端口电缆，你知道他们的损失吗？
PNA信号源有一个单独的放大器用于最高频段，最大功率下降非常快。
此外，第二源通过16dB耦合器耦合，因此第二源上的损耗要大得多。
从规格表中可以看出，24-26.5 GHz的最大电平功率为-11 dBm。
将电缆损耗添加到该电缆中以找到可以在不获取不同级别消息的情况下进行校准的最大功率。
你有多接近这个限制？



以下为原文

Do you have test port cables, and do you know their loss?

The PNA source has a separate amplifier for the highest band, and the max power drops off pretty quickly. Further, the second source is coupled through a 16 dB coupler so the loss on the second source is much greater. From the spec sheet the maximum leveled power available from 24-26.5 GHz is -11 dBm. Add the cable loss to that to find the maximum power that you can cal without getting an unlevel message. How close are you to that limit?

权力的下降是他需要思考的一件事。
我从来没有赞成PNA-X上用于IP3测量的当前功率均衡方法（矢量校正是篦，但功率均衡......呃）。
我建议在跳线J10和放大器之间放置16dB衰减器。
J11--它将平衡耦合器的损耗，并在相似的功率条件下设置两个源（1和2） - 我最好有两个不良信号源而不是一个好信号，另一个坏信号源。
我认为16dB衰减器也应该改善耦合器（组合器）的隔离度（Dr Joel，如果这是真的，你可能会大肆宣传）。
2.使用组合器启用的每个源使用功率计执行当前的初始功率调平。
我认为没有必要。
当我们在PNA-X上开发自己的IMD测试程序时，我想到只有一个源需要为所有需要的频率（RF1，RF2,2 * RF1-RF2,2 * RF2-RF1和任何其他频率）进行电平调整。
如果您需要（IM2等）*组合器禁用。*在调平期间包括参考接收器校准（如果您需要测量输入IM3 - 我默认情况下这样做）并将两个源设置为低频段高功率
路径配置中的模式（滤波器禁用）。然后你校准所有上述频率的B接收器.3。现在你打开组合器并为源1和2启用B接收RX调平并设置源的推进偏移。
总结你的放大器有足够的增益来克服组合器开启时的损失。如果不是你可能会添加另一个Aplifier（同一型号）



以下为原文

The drop of power is one thing that he need to think.
I was never in favor of the current method of power leveling on PNA-X for IP3 measurement ( the vector correction is grate, but power leveling... ehh).
1. I will recommend to put 16dB attenuator between jumper J10 & J11 - that will balance the loss of the coupler, and also set both sources (1& 2) in similar power condition - I better have two bad sources than one good and the other bad. I think 16dB attenuator also should improve coupler (combiner) isolation ( Dr_ Joel, you probably wave in about that if that is true or not).
2. The current initial power leveling is perform using power meter for each source with combiner enable. I think that it is not necessary.
When we develop our own IMD test program on PNA-X I come out with the idea that only one source need to be level for all needed frequencies ( RF1, RF2, 2*RF1-RF2, 2*RF2-RF1 and any other frequencies if you need (IM2 and so on) with *combiner disable.* During the leveling include the reference receiver calibration(in case you need to measure Input IM3 - I am doing that by default) and set the both sources to Low band High Power mode (filter disable) in path configuration. After that you calibrate the B receiver for all above frequencies.
3. Now you switch on the combiner and enable B receive RX leveling for source 1 & 2 and set propel offset for the sources.
I summing that you amp have enough gain to overcome the loss when the combiner is switch ON. If not you probably could add another Aplifier (same model