Electronics > Beginners

Measuring an OCXO - or not

<< < (5/7) > >>

metrologist:
My ADEV chart always seemed suspicious to me. I checked the calculations and the running sum of diff squared dropped the $ signs, so was not actually creating a running tally. I corrected this and the plot seems more like what feels right.

jpb:

--- Quote from: metrologist on October 25, 2018, 02:37:00 pm ---My ADEV chart always seemed suspicious to me. I checked the calculations and the running sum of diff squared dropped the $ signs, so was not actually creating a running tally. I corrected this and the plot seems more like what feels right.

--- End quote ---

If you want to check your plots, I'd recommend Bill Riley's program Stable 32 which is now free (it used to be quite expensive):
http://www.wriley.com/
EDIT : I see I've already mentioned this in a previous post but in a slightly different context.

metrologist:
Thanks, again.  :) I did import the frequency measurements into TimeLab, but I'm not sure if I am setting the correct parameters of if this kind of measurement is valid for the data. The results are much different.  Also, in TL I imported straight linear data, as if the OCXO would drive exactly 5mHz/day, and I get a straight line with upward slope where in my Excel chart I get a horizontal line.

metrologist:
And I try Stable32 using a two column text file time(s) <-> Frequency

KE5FX:

--- Quote from: metrologist on October 25, 2018, 07:13:05 pm ---Thanks, again.  :) I did import the frequency measurements into TimeLab, but I'm not sure if I am setting the correct parameters of if this kind of measurement is valid for the data. The results are much different.  Also, in TL I imported straight linear data, as if the OCXO would drive exactly 5mHz/day, and I get a straight line with upward slope where in my Excel chart I get a horizontal line.

--- End quote ---

Unless you are taking one sample per day, your sample interval is a bit long. :)  Can you post your data set as an attachment?

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod