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| Agilent E8357A |
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| joeqsmith:
Thanks, I downloaded them an will have a look. If the system has been user calibrated, does it still use the data from these files or are they only used as a default when no calibration has been performed? |
| joeqsmith:
Looking at Forzaman's 12 on left compared with Caesarv's 12 on right. I wonder when you run the alignment, does the PNA set the output much lower? I was expecting the power meter to be around 0 rather than -7. |
| caesarv:
The mxcal files are always used if available. Then, when you perform a user calibration, the corrections are applied on top of the existing mxcal values. I believe that there are also some second order effects with the mxcal files that deal with the phase transitions between bands....but my memory is a bit fuzzy on the exact details. |
| joeqsmith:
Thanks. Any idea about the -7dBm power recorded from the meter? Mine defaults to 0dBm and I assumed they would run the alignment at that level. |
| joeqsmith:
Assuming the datasheet uncorrected values are what we are looking for, my system without these files is no where near that. I don't have a good way to measure power but wanted to try and create these files. I added support to my software for my Signal Hound BB60C and automated the alignment process. The SA is limited to 6GHz and is not a good reference. My software uses 0dBm when performing the alignment. After 6GHz, I fudged the data. Assuming the SA was rolling off, I filling out the array with the value measured at 5.5GHzish. So ignore the data beyond 6GHz. It appears to improve things a fair amount and with my poor attention to calibration, it may be worth renting a meter to align it. |
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