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post #1 of 5 Old 06-22-19, 04:19 PM Thread Starter
Shackster
 
Join Date: Apr 2017
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Missing distortion measurements

When I perform a sine sweep measurement and select the distortion display the measurements of distortion (% or dBr of the harmonics or THD) are often not displayed in the lower panel. The attached screen shot shows this situation. Sometimes the measurements appear, sometimes they don't. I believe I have saved files where the distortion measurements were being displayed as % or dBr, but on opening the file again later they are not shown. As far as I can see this is a whim of the system (REW V5,19 JRE 1.80_162 32-bit on Windows XP), or did I do something wrong??
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Missing distortion measurements-distortion-example.jpg  

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post #2 of 5 Old 06-23-19, 03:32 AM
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Re: Missing distortion measurements

Your cursor is positioned to the left of where the distortion data starts. The figures in the legend are for the frequency where the cursor is positioned.
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post #3 of 5 Old 06-23-19, 04:27 AM Thread Starter
Shackster
 
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Re: Missing distortion measurements

Thanks, now I understand: it's the cursor position for which readings in the graph legend (= "panel" in my question) are shown.

I had looked in the REW V5.19 HELP (PDF) first but could not find this instruction. To counter my misunderstanding you might care to add this information in the paragraph on p.99 starting "The Distortion figures control..."

I have now found the hint that the cursor was set to 1kHz in the Distortion Example of a soundcard loopback measurement (pp. 99-100 PDF HELP), but curiously (for me) the cursor is not visible: there is no little box at the bottom of the cursor showing the selected frequency (1kHz), which is what always seems to happen with my settings.
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post #4 of 5 Old 06-26-19, 02:17 AM
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Re: Missing distortion measurements

The cursor frequency appears OK on your capture, is it not there on the screen? Can you attach a screen shot (PrtSc)?
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Missing distortion measurements-distortion-example.png  

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post #5 of 5 Old 06-27-19, 03:55 PM Thread Starter
Shackster
 
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Re: Missing distortion measurements

I'm sorry your time was occupied with a misunderstanding: It is YOUR example in the HELP file which has no cursor. After I learned that I need to place the cursor in the graph to obtain the distortion measurements I was puzzled that your example could show distortion measurements but apparently WITHOUT the cursor. There may be little benefit for anyone in clarifying this discrepancy!
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