E8361C偏置输入上测得的电阻始终小于10欧姆

只是为了澄清......这显然必须是E8361C（67GHz PNA）;
不是E8316C。
你在哪里测量？到...？你认为“正确的价值”是什么？
我可以在工作时检查我们的装置......但直到周二才能检查。



     以下为原文

  Just to clarify...this obviously must be an E8361C (a 67GHz PNA); not E8316C.

Where are you measuring from/to?...and what do you consider the "correct value"?

I can check our unit at work...but not until Tuesday.

是的，实际上它是E8361C，谢谢你的修正。
我使用校准基板在使用开路，短路，通孔和负载标准校准VNA时遇到了一些问题。
所以我的教授建议我可以使用VNA后面板上的偏置输入端子检查VNA端口的实际直流电阻，以确保校准基板上的这些标准表现得如此。
例如，当通过偏置输入测量时，端口1处的50欧姆负载应该给我略高于50欧姆（因为电缆损耗）。
端口1表现正常，但端口2总是提供0.9欧姆电阻（即使它打开）。
我在偏置输入端使用BNC到香蕉适配器，然后用万用表测量电阻。
感谢您的回复，请在有空的时候查看您的设备。编辑：anirbans2006于2013年2月16日上午8:09



     以下为原文

  Yes it is a E8361C actually, thanks for the correction. I was getting some problem in calibrating the VNA with Open, Short, Through and Load Standards using a calibration substrate. So my Professor suggested that I can check the actual dc resistance at the VNA ports using the bias input terminals at the back panel of the VNA just to ensure that these standards on the cal substrate are behaving as they should. For example a 50 Ohm load at Port 1 should give me a little higher than 50 Ohm(because of cable losses) when measured through bias inputs. Port 1 is behaving properly but port 2 always gives a 0.9 Ohm resistance (even when it is open). I am using a BNC to banana adapter at the bias input and then a multimeter to measure the resistance.
Thanks for your reply, please check your unit whenever you have time.

Edited by: anirbans2006 on Feb 16, 2013 8:09 AM

我同意它确实看起来很短暂。
我将在星期二调查一下。



     以下为原文

  I agree that it does seem like it is shorted.  I will look into it on Tuesday.

假设您正在测量偏置端口BNC连接器的外部触点和内部触点，并且在相应的前面板端口上有50欧姆的负载，那么您应该读取大约50-51欧姆。
如果您的读数要少得多，请检查前面板端口，看看连接器内是否有任何金属屑。
有些事情肯定是错的。
如果您有高分辨率仪表，请将前面板端口保持打开状态，然后您可以将后偏置BNC和前面板端口对准。
短路可以更靠近具有最小阻力的端口。



     以下为原文

  Assuming you are measuring from the outer to inner contacts of the bias port BNC connector, and you have a 50 ohm load on the appropriate front panel port, then you should read about 50-51 ohms.  If you are reading substantially less then check the front panel port to see if any metal shavings are lodged inside the connector.  Something is definitely wrong.

If you have a high resolution meter, leave the front panel port open, then you can ohm out the rear bias BNC and the front panel port.  The short may be located closer to the port that has the least resistance.