Products > Test Equipment
Kirkby calibration kit alternatives?
radar_macgyver:
I have the 10 GHz version of the Applied EM cal kit. I made some measurements on a FieldFox 9917B that was first calibrated with a Rosenberger RPC-3.50. The Fieldfox was set to full span (30 kHz - 18 GHz) with 1601 points. I then measured the female standards from the Applied EM kit and saved the s1p files. Also grabbed an s1p from the RPC-3.50.
I plotted the impedance, and it seems like the AEM kit does well up to ~10 GHz.
I quit after tearing my hair out for a good 2 hours trying to figure out the METAS tools, so if someone else can use it to generate a model I'd be grateful (and maybe post a link to a tutorial?)
alan.bain:
Are you trying to use VNA Tool? I had previously had issues with this and the process I got was
Right-click on the file of measurements, then select Database / Fit Calibration Standard Model (as per the screenshot)
You then choose which type of standard it is and which parameters you don't want to adjust (I would suggest that initially you reduce the set size e.g. remove L2/L3 from the fit for a short) and hit "Start Optimization". If you try and fit too many it can get into "Not Responding" state which is a bit poor!
TheSteve:
--- Quote from: radar_macgyver on February 08, 2024, 09:14:11 pm ---I have the 10 GHz version of the Applied EM cal kit. I made some measurements on a FieldFox 9917B that was first calibrated with a Rosenberger RPC-3.50. The Fieldfox was set to full span (30 kHz - 18 GHz) with 1601 points. I then measured the female standards from the Applied EM kit and saved the s1p files. Also grabbed an s1p from the RPC-3.50.
I plotted the impedance, and it seems like the AEM kit does well up to ~10 GHz.
I quit after tearing my hair out for a good 2 hours trying to figure out the METAS tools, so if someone else can use it to generate a model I'd be grateful (and maybe post a link to a tutorial?)
--- End quote ---
Can you give the expected/specified Z0 offset and offset delay for the Applied EM kit. As was mentioned for it to work best you should know some of the parameters, or at least enter what they should ideally be to reduce the variables.
小太:
--- Quote from: TheSteve on February 10, 2024, 07:47:16 am ---
--- Quote from: radar_macgyver on February 08, 2024, 09:14:11 pm ---I have the 10 GHz version of the Applied EM cal kit. I made some measurements on a FieldFox 9917B that was first calibrated with a Rosenberger RPC-3.50. The Fieldfox was set to full span (30 kHz - 18 GHz) with 1601 points. I then measured the female standards from the Applied EM kit and saved the s1p files. Also grabbed an s1p from the RPC-3.50.
I plotted the impedance, and it seems like the AEM kit does well up to ~10 GHz.
I quit after tearing my hair out for a good 2 hours trying to figure out the METAS tools, so if someone else can use it to generate a model I'd be grateful (and maybe post a link to a tutorial?)
--- End quote ---
Can you give the expected/specified Z0 offset and offset delay for the Applied EM kit. As was mentioned for it to work best you should know some of the parameters, or at least enter what they should ideally be to reduce the variables.
--- End quote ---
They posted values in this post as an attachment.
TL;DR for the female load is offset Z_0=54.16Ω and delay=4.77ps
I'll try to derive calibration parameters myself with the data too in a few days, if nobody else has done it by then :)
radar_macgyver:
Per the PDF included with the kit, Z0 offset is 54.16 ohm, delay is 4.77 ps, and loss is 10 Gohm/sec for the female load.
I ran the IN3OTD Octave scripts with the max frequency set to 10 GHz, and got Z0 offset = 54.5 ohm, delay 5.37 ps and loss of 20 Gohm/s. I suspect the optimization is not converging on a good solution since it hits various bounds (in the case of the run I included the results from, the upper bound for loss was 20 Gohm/s).
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