can your 'scope do this?

jackinnj · 30th June 2006, 12:06 AM

some microvolts into a Tektronix 5223 digitizer with 5a22n differential amplifier:

Christer · 30th June 2006, 01:46 AM

No

Stocker · 30th June 2006, 03:00 AM

Yeah, well, well,

my scope has more buttons than your scope!

lumanauw · 30th June 2006, 04:07 AM

Hi, Jackinnj,

How can I get this picture on the scope? The upper is the basic sinewave, the lower is the distortion component, but they both appear at the same time at the same scope?

jahonen · 30th June 2006, 08:29 AM

I guess not directly.

But how about this: Measuring three channel single sweep at 50 ms/div, and then zooming at the details without recapturing the signals to 200 µs/div

lumanauw, I believe you'll need some kind of filter to pick up the desired distortion component(s) and eliminate the fundamental.

Regards,
Janne

lumanauw · 30th June 2006, 02:15 PM

How to do it? First I tought it is done by somekind of scaled X - Y

jackinnj · 30th June 2006, 02:21 PM

use an active T-notch filter -- this will give you THD+N -- to just get THD you need to count the magnitude of each harmonic -- which you can do in DSP -- design of such a filter can be found on Texas Instruments and Analog Devices websites.

fwiw -- the USB1208FS and Softwire (or other software packages) can do this pretty easily.

the 5223 example shown at the start of this thread is a scope used for low noise applications -- while technically part of the 5xxx series of boatanchors it has many of the features of the 7xxx devices but the bandwidth is quite limited.

30th June 2006, 12:06 AM	#1
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	can your 'scope do this? some microvolts into a Tektronix 5223 digitizer with 5a22n differential amplifier:

30th June 2006, 03:00 AM	#3
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	say, that's pretty neat... Yeah, well, well, my scope has more buttons than your scope! __________________ Jesus loves you.

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30th June 2006, 01:46 AM	#2
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	No

30th June 2006, 08:29 AM	#5
jahonen diyAudio Member Join Date: Jan 2002 Location: Kuopio, Finland	I guess not directly. But how about this: Measuring three channel single sweep at 50 ms/div, and then zooming at the details without recapturing the signals to 200 µs/div lumanauw, I believe you'll need some kind of filter to pick up the desired distortion component(s) and eliminate the fundamental. Regards, Janne

30th June 2006, 02:15 PM	#6
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	How to do it? First I tought it is done by somekind of scaled X - Y

30th June 2006, 02:21 PM	#7
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	use an active T-notch filter -- this will give you THD+N -- to just get THD you need to count the magnitude of each harmonic -- which you can do in DSP -- design of such a filter can be found on Texas Instruments and Analog Devices websites. fwiw -- the USB1208FS and Softwire (or other software packages) can do this pretty easily. the 5223 example shown at the start of this thread is a scope used for low noise applications -- while technically part of the 5xxx series of boatanchors it has many of the features of the 7xxx devices but the bandwidth is quite limited.

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