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Wow and flutter measurement for tape deck

Forum for discussing PicoScope version 6 (non-automotive version)

Wow and flutter measurement for tape deck

Postby hdrobien » Thu Jun 23, 2016 8:24 am

Hi

Would it be possible to add this feature ?

Thanks
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Re: Wow and flutter measurement for tape deck

Postby Gerry » Thu Jun 23, 2016 2:07 pm

Hi hdrobien,

What would you want to add the feature to?

Wow and flutter are normally measured by specialist hardware equipment, including a frequency discriminator to give reasonable accuracy measurements of discrepancies in frequency. None of our equipment has this.

Regards,

Gerry
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Re: Wow and flutter measurement for tape deck

Postby hdrobien » Thu Jun 23, 2016 2:19 pm

It can be done through software and there is already a software that does it, "wfgui" (you can google it).

It uses 3.000 and 3150 Hz reference signal (these frequencies are used by genuine test tapes).

It would be nice to calibrate a tape deck with one single tool (speed, w&f, azimuth, levels...).
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Re: Wow and flutter measurement for tape deck

Postby hdrobien » Thu Jun 23, 2016 2:57 pm

And for the same purpose it would be interesting to have measurement in dBu and dBv.
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Re: Wow and flutter measurement for tape deck

Postby Gerry » Mon Jun 27, 2016 10:07 am

Hi hdrobien,

Thanks for pointing that out, I wasn't aware of a software solution.

This is actually the ideal sort of application for someone to work on with our Software Development Kit. Perhaps stating more specifically what you had in mind might trigger someones creative input on this.

Regards,

Gerry
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Re: Wow and flutter measurement for tape deck

Postby hdrobien » Mon Jun 27, 2016 11:39 am

Hi

I am just a user but what I need is what wfgui offers: instant, average et max value of W&F, compatiblity with 3000 and 3150 Hz reference tapes.

And what about the possibility to measure voltage in dBu and dBv ? (along qith the possility to set voltage in RMSin the signal generator).
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Re: Wow and flutter measurement for tape deck

Postby Gerry » Tue Jun 28, 2016 2:44 pm

Hi hdrobien,

Isn't wfgui free to use, in which case you already have what wfgui offers. I thought that what you wanted was to combine it's functionality with some PicoScope features into a single tool which, as I mentioned before, is what the SDK can be made to do (this sort of tool, i.e. wfgui, would not be the right fit for Picocope 6). That's why I was asking you to start a discussion on what sort of PicoScope functions you would like to see integrated.

Regarding measuring voltage in dBu (remember there is no dBv anymore - my understanding is that for rms Volts ref to 1mW into 600Ω the standardized unit name dBu replaced dBv to avoid confusion with the standardized unit name dBV for rms Volts ref to 1V) you can already do that with Math Channels in PicoScope 6. You just create a channel with the value '20*log(sqrt(average((A^2)))/0.7746)'. Similarly, specifying the voltage in RMS instead of p-p is just a scaling/conversion factor of 0.707 x the Amplitude specified in the Sig Gen.

Regards,

Gerry
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