PNA-X相位参考校准不均匀源错误梳状滤波器发生器

您好，我正在使用固件版本为A.90.09.09固件的67GHz PNA-X。
我正在尝试使用梳状滤波器发生器来执行55MHz至33GHz的相位参考校准。
我可以毫无困难地对源衰减值0,10和20dB进行校准。
然而，当我达到30dB时，我分别在校准的步骤5和7中得到了“不均匀的源”错误。
（见附件）。
这也发生在40和50dB的源衰减。
当我尝试将此特定的第1层校准用于相位与驱动测量时，我的增益测量值比预期值高出约3dB。
如果有人可以让我知道为什么我会收到此错误以及是否可以修复，那将非常感激。
谢谢，rok comb filter cal error src atten = 30db step 7.tiF260.9 KB



     以下为原文

  Hello,

I am using a 67GHz PNA-X with firmware version A.90.09.09 firmware. I am trying to use the comb filter generator to perform a phase reference calibration from 55MHz to 33GHz. I had no trouble performing the calibration for source attenuation values of 0,10, and 20dB. However, when I got to 30dB, I got 'unleveled source' errors in step 5 and 7 of the calibration respectively. (see attachments). This also happened for source attenuation at 40 and 50dB as well. When I try to use this particular Tier 1 calibration for a phase vs drive measurement, my gain measurement is higher by about 3dB from expected. If someone can let me know why I am getting this error and whether it is fixable or not, that would be greatly appreciated.

Thanks,
rok   
附件

• comb filter cal error src atten=30db step 5.TIF223.4 KB
• comb filter cal error src atten=30db step 7.TIF260.9 KB