Cal all channels错误消息

我有一个4端口N5241A（固件更新到最新的产品版本），我用它来测试双工变频器。
我的分析仪设置为使用端口3和4测量SMC +相位，IMDx和NFX（每个都有自己的通道）。我使用两个PNA-X的内部信号源和一个外部合路器为IM3创建双音信号
测量;
DUT的LO由MXG外部馈电，我使用U2000A功率传感器执行源校准。
我尝试使用“Cal All Channels”校准所有3个通道。
但是，在校准完成并保存用户校准集后，显示屏上会弹出一条错误消息，说明（非逐字）校准中缺少错误条款。
一旦我清除了错误消息，我检查了可用的校准集，发现只保存了SMC +阶段通道的校准集;
IM3和NF频道的校准集未保存。
我使用校准向导重复了IM3和NF通道的校准，并且令我惊讶的是，校准成功了！
为此，我前往每个测量通道并更改为端口1和2，然后再次尝试“Cal All Channels”;
校准成功（令我惊讶的是！）还有其他人遇到过这个问题吗？
任何建议/反馈将不胜感激！



     以下为原文

  I have a 4-port N5241A (firmware updated to latest production release) that I'm using to test a duplex frequency converter.  My analyzer is setup to measure SMC + phase, IMDx and NFX (each with its own channel) using ports 3 and 4.  I'm using the two PNA-X's internal sources and an external combiner to create the two tone signal for the IM3 measurement; the LO for the DUT is being fed externally by a MXG and I'm using a U2000A power sensor to perform the source calibration.

I attempted to calibrate all 3 channels using "Cal All Channels".  However, after the calibration finished and I saved the user cal set, an error message popped up on the display stating (not verbatim) that error terms were missing from the calibration.  Once I cleared the error message, I checked the available cal sets and found that only the cal set for the SMC + phase channel was saved; the cal sets for the IM3 and NF channels were not saved.  

I repeated the calibrations on the IM3 and NF channels using the Calibration Wizard and the calibrations, much to my surprise, were successful!

In response to this, I went to each measurement channel and changed to ports 1 and 2 and then tried "Cal All Channels" again; the calibration was successful (again much to my surprise!)  

Has anyone else encountered this problem?  Any advice/feedback would be greatly appreciated!