DUT是被动还是主动？
DUT是什么类型的设备？
尝试移除DUT并将分离器臂直接连接到VVM的port1和port2，以查看它是否仍然不稳定。
如果它在没有DUT的情况下变得稳定，则DUT中可能存在问题，导致DUT中的信号丢失。
如果将源与Splitter-Input直接连接到VVM不能产生稳定的测量，请确保源的频率与调谐VVM的频率相同。
此VVM不会自动调整频率，因此您必须始终手动设置它。
如果仪器仍然不稳定，那么我担心VVM中可能存在问题。
对VVM功能的快速测试将遵循以下过程：将外部源连接到分离器。
将信号源调至1GHz（或任何属于VVM频率范围的频率.1G适合测试）确认您的信号源输出一个约0dBm的非调制CW音调进入分配器输入。
验证分离器是否正在为模型分离器生成具有正确功率下降的输出。
（检查两个端口）确保从分路器连接到VVM的任何电缆都通电（检查两根电缆是否有故障）。
使用“Freq”硬键然后使用Frequency软键将VVM设置为1GHz，然后输入您的频率。
将分离器的输出臂连接到VVM的端口1和端口2。
观察显示的信号。
如果信号仍然变化很多（几个dB，或几度），那么我怀疑VVM有问题。
我希望这有助于您获得解决方案。
请再次告知您的DUT设备类型。
如果DUT正在转换频率，或者在一只手臂上大量丢弃信号，我会特别担心。
我在没有DUT的情况下在我的工作台上重复了这个测量，并且可以确认您是否按照上面的说明操作，结果将是dB和相位的稳定值。
N9923A将显示相位偏移，屏幕上会显示一个小的dB值，可以通过将仪表归零来消除。
如果更改IFBW或频率，则必须重新归零。
在零之后，在其中一个分离器臂上插入额外长度的电缆应显示相位偏移的增加和额外的dB偏移，这是您对A / B或B / A比率的预期。
最诚挚的问候，pc3
以上来自于谷歌翻译
以下为原文
Is the DUT passive or active? What kind of device is the DUT?
Try removing the DUT and connecting the splitter arms directly to port1 and port2 of the VVM to see if it remains unstable. If it becomes stable without the DUT, there could be an issue in your DUT causing signal to be lost coming out of your DUT.
If the direct connection of the Source to Splitter-Input to VVM does not produce stable measurement, please ensure the frequency of the source is the same as the frequency you tune the VVM to. This VVM does not autotune the frequency so you must always set it manually.
If the instrument still remains unstable, then I am worried there could be a problem in the VVM.
A quick test of the VVM functionality would be to follow this process:
Connect your external source to your splitter.
Tune source to 1GHz (or any frequency that falls in the VVM frequency range. 1G is good for test)
Verify your source is outputting a non-modulated CW tone with about 0dBm into the splitter input.
Verify your splitter is producing output with a power drop correct for the model splitter. (check both ports)
Ensure power is getting through any cables you are connecting to the VVM from the splitter (check both cables for fault).
Set the VVM to 1GHz using "Freq" hardkey followed by the Frequency softkey, and enter your frequency.
Connect output arms of the splitter to port 1 and port2 of the VVM.
Observe the displayed signal. If the signal is still varying by a lot (several dB, and or several degrees) then I suspect the VVM has a problem.
I hope this helps you get a solution. Once again, please inform what your type of device is your DUT. I am especially concerned if the DUT is translating frequency, or is dropping signal by a large amount on one arm.
I have duplicated this measurement on my bench without the DUT, and can confirm if you follow the instructions above that the results will be stable values of dB and Phase. The N9923A will display a phase offset and there will be a small dB value shown on screen, which can be removed by zeroing the meter. If you change IFBW or Frequency, you must re-zero.
After zero, insertion of an additional length of cable on one of the splitter arms should show an increase in phase offset and an additional dB offset, which is what you expect with A/B or B/A ratios.
Best Regards,
pc3
DUT是被动还是主动？
DUT是什么类型的设备？
尝试移除DUT并将分离器臂直接连接到VVM的port1和port2，以查看它是否仍然不稳定。
如果它在没有DUT的情况下变得稳定，则DUT中可能存在问题，导致DUT中的信号丢失。
如果将源与Splitter-Input直接连接到VVM不能产生稳定的测量，请确保源的频率与调谐VVM的频率相同。
此VVM不会自动调整频率，因此您必须始终手动设置它。
如果仪器仍然不稳定，那么我担心VVM中可能存在问题。
对VVM功能的快速测试将遵循以下过程：将外部源连接到分离器。
将信号源调至1GHz（或任何属于VVM频率范围的频率.1G适合测试）确认您的信号源输出一个约0dBm的非调制CW音调进入分配器输入。
验证分离器是否正在为模型分离器生成具有正确功率下降的输出。
（检查两个端口）确保从分路器连接到VVM的任何电缆都通电（检查两根电缆是否有故障）。
使用“Freq”硬键然后使用Frequency软键将VVM设置为1GHz，然后输入您的频率。
将分离器的输出臂连接到VVM的端口1和端口2。
观察显示的信号。
如果信号仍然变化很多（几个dB，或几度），那么我怀疑VVM有问题。
我希望这有助于您获得解决方案。
请再次告知您的DUT设备类型。
如果DUT正在转换频率，或者在一只手臂上大量丢弃信号，我会特别担心。
我在没有DUT的情况下在我的工作台上重复了这个测量，并且可以确认您是否按照上面的说明操作，结果将是dB和相位的稳定值。
N9923A将显示相位偏移，屏幕上会显示一个小的dB值，可以通过将仪表归零来消除。
如果更改IFBW或频率，则必须重新归零。
在零之后，在其中一个分离器臂上插入额外长度的电缆应显示相位偏移的增加和额外的dB偏移，这是您对A / B或B / A比率的预期。
最诚挚的问候，pc3
以上来自于谷歌翻译
以下为原文
Is the DUT passive or active? What kind of device is the DUT?
Try removing the DUT and connecting the splitter arms directly to port1 and port2 of the VVM to see if it remains unstable. If it becomes stable without the DUT, there could be an issue in your DUT causing signal to be lost coming out of your DUT.
If the direct connection of the Source to Splitter-Input to VVM does not produce stable measurement, please ensure the frequency of the source is the same as the frequency you tune the VVM to. This VVM does not autotune the frequency so you must always set it manually.
If the instrument still remains unstable, then I am worried there could be a problem in the VVM.
A quick test of the VVM functionality would be to follow this process:
Connect your external source to your splitter.
Tune source to 1GHz (or any frequency that falls in the VVM frequency range. 1G is good for test)
Verify your source is outputting a non-modulated CW tone with about 0dBm into the splitter input.
Verify your splitter is producing output with a power drop correct for the model splitter. (check both ports)
Ensure power is getting through any cables you are connecting to the VVM from the splitter (check both cables for fault).
Set the VVM to 1GHz using "Freq" hardkey followed by the Frequency softkey, and enter your frequency.
Connect output arms of the splitter to port 1 and port2 of the VVM.
Observe the displayed signal. If the signal is still varying by a lot (several dB, and or several degrees) then I suspect the VVM has a problem.
I hope this helps you get a solution. Once again, please inform what your type of device is your DUT. I am especially concerned if the DUT is translating frequency, or is dropping signal by a large amount on one arm.
I have duplicated this measurement on my bench without the DUT, and can confirm if you follow the instructions above that the results will be stable values of dB and Phase. The N9923A will display a phase offset and there will be a small dB value shown on screen, which can be removed by zeroing the meter. If you change IFBW or Frequency, you must re-zero.
After zero, insertion of an additional length of cable on one of the splitter arms should show an increase in phase offset and an additional dB offset, which is what you expect with A/B or B/A ratios.
Best Regards,
pc3
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