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jackinnj 30th June 2006 01:06 AM

can your 'scope do this?
some microvolts into a Tektronix 5223 digitizer with 5a22n differential amplifier:

Christer 30th June 2006 02:46 AM

No :(

Stocker 30th June 2006 04:00 AM

say, that's pretty neat...
Yeah, well, well,

my scope has more buttons than your scope!

lumanauw 30th June 2006 05:07 AM

2 Attachment(s)
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 09:29 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 Ás/div :cool:

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


lumanauw 30th June 2006 03:15 PM

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

jackinnj 30th June 2006 03:21 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.

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