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Picoscope 2200 series with Macbook Air - measurement issues

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Picoscope 2200 series with Macbook Air - measurement issues

Postby single_ended » Wed Sep 02, 2015 2:14 am

Hi. I am experiencing the following measurement issues with the 2206 on the Mac.

I originally purchased a 2204 and recently added a 2206.

On the 2206, in spectrum mode, the data acquisition appears unstable. The harmonic signals vary greatly and with automated measurements, the numbers jump around quite a bit. For example, THD might vary between 0.1% to 0.4%, or between 1.2% and 2%. Installing the 2204 and using the same probe, the data acquisition and measurements become stable (though the automated distortion measurements are comparatively higher than those from the 2206).

Thanks.
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Re: Picoscope 2200 series with Macbook Air - measurement iss

Postby Martyn » Wed Sep 02, 2015 1:26 pm

Can you post the data files, or screen shots, to show what you mean ?
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Re: Picoscope 2200 series with Macbook Air - measurement iss

Postby single_ended » Thu Sep 03, 2015 7:12 am

Hi.

Here are several measurements comparing the 2204A and the 2206A.

Many thanks!
Attachments
20150903-0001 2206A 100mv.psdata
(112.96 KiB) Downloaded 78 times
20150903-0001 2204A 100mv test.psdata
(130.96 KiB) Downloaded 67 times
20150903-0001 2206A 500mv.psdata
(57.47 KiB) Downloaded 67 times
20150903-0001 2204A 500mv.psdata
(113.41 KiB) Downloaded 68 times
20150903-0001 2206A 1V.psdata
(42.09 KiB) Downloaded 70 times
20150903-0001 2204A 1V.psdata
(115.28 KiB) Downloaded 69 times
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Re: Picoscope 2200 series with Macbook Air - measurement iss

Postby single_ended » Mon Sep 07, 2015 3:14 am

Hi. I have an additional follow up inquiry pertaining to the 2204A. The distortion measurements at 100mv input are higher than the distortion measurements at 500mv input. This appears consistent across different amps - not sure why 2204A is giving such readings. Tips on improving the measurements at low mv input would be greatly appreciated. Many thanks.
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Re: Picoscope 2200 series with Macbook Air - measurement iss

Postby Martyn » Mon Sep 14, 2015 9:00 am

The two devices are based on different hardware designs, and they have different specifications. The higher input bandwidth of the 2206a, and the different front end design, may explain the differences you are seeing with your tests.
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Re: Picoscope 2200 series with Macbook Air - measurement iss

Postby single_ended » Mon Sep 14, 2015 5:20 pm

Hi Martyn,

Thank you for the explanation. But since the 2206A measurements are not stable, they are not useful in fine-tuning a design. I require a solution to resolve the stability issue when using the 2206A with the Macbook Air. Your advice is greatly appreciated. Many thanks.
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Re: Picoscope 2200 series with Macbook Air - measurement iss

Postby Martyn » Tue Sep 15, 2015 6:13 am

We would need some details on what you are measuring, therefore it may be better to send these directly to the support team at support@picotech.com
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