Hi Dominique, One particular FR4 material has the following parameters: er=4.75, tan d=0.0135 (probably at 1 GHz). This is the type of material that would be...
Dear Dominique, The numbers that Rashaunda gave you sound about right to me. I spoke with an expert here who said you should expect a loss tangent of about ...
... Dear Dominique, One thing you may need to watch out for with FR4 is anisotropy in the permittivity as a result of the glass fibres embedded in the resin...
Hi Again- If you want more information on the properties or anisotropy of FR4, you might ask at the MTT-11 Materials Forum. Mike Janezic showed me a very...
Dear Calibration Experts, We need to calibrate a test fixture with our own standards. We have short, open, thru and load available. An attempt to apply SOLT ...
Dear Marek, Your idea of putting in a transparent calibration set may not work, as you may not be able to determine the switch terms for the VNA. You may also...
... Dear Marek, The problem makes perfect sense to me. Apologies for not directly addressing your desire to carry out LRRM but if you can make yourself a Line...
Sorry for the repeat information. Dylan clearly types faster than me. John Superconducting Microwave Devices Research Group Department of Engineering Science ...
... I would not exaggerate the importance of switch terms. In case of measurements of small-signal devices you often use an attenuator between the switch and...
Dear WinCal users, Can anybody of you tell me in what format WinCal saves the dat, when I want to save it "To File"? I tried that, and at least opening the ...
Dear experts, Does anyone of you use calibration substrate CS-5 of Picoprobe's? If so, maybe you could help me then. We are using Picoprobe's calibration...
Dear Dr. Dylan, Thank you for all your help in the past. I was wondering if MultiCal supports the new Agilent PNA series or if anyone wrote a program to be...
Hi Anna, WinCal allows a save of the raw measurements of the standards to a binary file. The format is not readable, but there is an option (.ini switch) that ...
Hi Leonard, Thank you very much for your answer! You are right, I needed the error terms. Can you recommend me any application I could read them from VNA? With...
... Could you please say something more about it? Which .INI file? What option? Is this feature avaliable in WinCal 2.23? One more question. In the Cal Def...
... Did you try contacting GGB directly? I have impression that they are rather customer friendly. On our request they customized a bit their probes and...
Hi Marek, Re: save text versions of the raw data: This is a recent addition (I am looking into just which version) but I am fairly confident that it was _not_...
Dear Marek, Thank you for setting up this test problem. It is a good test case, and has given me some ideas on how to improve StatistiCAL! First, your errors...
Dear Dylan, ... Is it bad if ODRPACK has trouble calculating derivatives? Is there something wrong with the (simulated) measurements? The problem seems to be...
... You may be interpreting correct results as erroneous. Keep in mind that multiplying all of the error-box transmission coefficients does not change the...
... ODRPACK uses finite differences to calculate derivatives. I suspect that the problem is related to using perfect data, and that the results, at least in...
Dear Dylan, ... When you multiply a transmission matrix by a scalar coefficients S11 and S22, and also product S12*S21 do not change. I see big differences in...
... Sorry Marek- I meant to say that multiplying all of the error-box transmission coefficients by -1 does not change the results! I guess that I pressed send ...
... I have not had a chance to test this out on our PNA, but if you call Agilent, I'm sure they will be able to tell you. If the PNA can handle 8510 GPIB...
Dear Imad, MultiCal will not take data from the PNA. However, Agilent is working on a new interface for the PNA for both MultiCal and StatistiCAL. I am sorry, ...
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