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Old 20th May 2016, 02:34 AM   #101
panson_hk is offline panson_hk  Hong Kong
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Further test done with a arbitrary waveform generator feeding CLIO Pocket. The test confirms THD-%/dB meter uses only 2nd harmonic.

From left to right
First figure: fundamental (500 Hz) and second harmonic
Second figure: fundamental, second & fourth harmonic
Third figure: fundamental, second & third harmonic

Value shown by the THD-dB meter barely unchanged.
Attached Images
File Type: png CLIO-Pocket FFT1.png (43.8 KB, 319 views)
File Type: png CLIO-Pocket FFT2.png (44.8 KB, 317 views)
File Type: png CLIO-Pocket FFT3.png (44.3 KB, 318 views)

Last edited by panson_hk; 20th May 2016 at 02:36 AM.
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Old 24th May 2016, 04:39 PM   #102
celef is offline celef
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Pitty that it lacks a better distorsion analyzer and presentation otherwise it looks very good to me! Is it possible that audiomatica Will release more advanced software for the pocket hardware? Clio pocket PRO?
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Old 25th May 2016, 02:05 AM   #103
panson_hk is offline panson_hk  Hong Kong
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I hope so. But that may threaten the big CLIO. Both of them are essentially sound card + software. How about API, LabView/Matlab driver?
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Old 25th May 2016, 01:49 PM   #104
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Maybe so, but a full blown clio pocket pro software would still not get you as much as the big clio, the pocket hardware is still not as advanced as the biggo clio?
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Old 26th May 2016, 01:43 PM   #105
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For the LogChirp measurement signal, is it possible to set the played freqency bandwidth like start (and stop) frequency? This to protect tweeters when measured bared
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Old 26th May 2016, 03:40 PM   #106
SY is offline SY  United States
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Yes, use the Generator Control. On the lower right side of the screen, there's a set of Output controls. Click the down arrow on the right and it will bring up the Generator Control screen.
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Old 27th May 2016, 12:16 PM   #107
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That's great, thanks!
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Old 8th August 2016, 04:15 PM   #108
shank1207 is offline shank1207  France
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Quote:
Originally Posted by SY View Post
It does measure distortion.
Hi can you guide me on measuring THD using Clio pocket, i tried the system by sending sin and measuring FFT i could see the harmonics but how can we quantify them in percentage? thanks
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Old 8th August 2016, 04:26 PM   #109
SY is offline SY  United States
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Convert dB to level with respect to the fundamental. For example, if a dominant harmonic is 40 dB down, it's 1%. Many find dB more useful than percent, take your choice.
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Old 9th August 2016, 05:45 AM   #110
panson_hk is offline panson_hk  Hong Kong
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Quote:
Originally Posted by SY View Post
Yes, use the Generator Control. On the lower right side of the screen, there's a set of Output controls. Click the down arrow on the right and it will bring up the Generator Control screen.
It only changes the freq. range (start or stop) when you use the generator independently. It doesn't change the lower and upper freq. when you use logchirp to make measurement (imp, SPL, dbV, etc.). I am using rel.1.4.1 software.

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