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In Reply to: Re: Not that I can tell posted by drwkng on February 1, 2007 at 01:11:59:
The normal IMD test signal consists of 70 Hz and 7000Hz, which is what is displayed on my graph and also the results you linked to.Your results are weird because they are not showing these fundamentals.
You must have changed Rightmark options to measure IMD using 11kHz and 12kHz signals. This is not the standard way to measure IMD as per EIAJ.
Incidentally, I noticed that you results show a significantly higher noise floor between 100-500 Hz, indicating that you do have some issues with power supply noise.
Try measuring again after changing the settings in Rightmark.
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Follow Ups
- You have used a different setting on Rightmark - Christine Tham 01:20:53 02/01/07 (5)
- By the way, the reason why 11 and 12 kHz are NOT a good way to measure IMD ... - Christine Tham 01:28:05 02/01/07 (0)
- Re: By the way, the reason why 11 and 12 kHz are NOT a good way to measure IMD ... - drwkng 01:57:49 02/01/07 (1)
- Well, my measurements are at 44.1k - Christine Tham 12:12:06 02/01/07 (0)
- Re: You have used a different setting on Rightmark - drwkng 01:25:58 02/01/07 (0)
- Actually I had a relook at your graphs - Christine Tham 01:32:53 02/01/07 (0)
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