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Oscilloscope Measurements: Different From Their Analog Days

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MeasurementBlues
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Analog scope
MeasurementBlues   6/3/2014 11:17:41 PM
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Arthur,

Could you use persistence to display the waveforms longer, maybe even with whough time to place your cursors?

The first cursors were horizontal and vertical lines superimposed on the display that you could use to measure the amplitude and time differences of points on the waveform. Cursors couldn't do more on an analog oscilloscope since the waveforms were transient -- they only existed for the duration of the sweep.

Arthur Pini
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Re: Analog scope
Arthur Pini   6/4/2014 8:16:17 AM
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Hi Martin,

You could align cursors with the waveform visually if the waveform were repetitive or you could use the persistence of the phosphor (P7 would remain visible for about 20 seconds in a dark room or with a hood).  What I intended to say was that cursors could not 'ride ' on the waveforms as they do in a digitical scope because the scope did not retain the waveform.  Having cursors move on the waveform avoids visual alignment errors that can happen with simple overlaid cursors.

Art 

gah4
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Re: Analog scope
gah4   6/5/2014 9:11:12 PM
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In between the traditional analog scope and the digital version was the storage CRT. The elecron (charge) image would be stored on the screen, and made visible with a flood electron gun. 

But yes, with cheap digital storage, that is the best way to do it.

bikeron
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Grids
bikeron   6/12/2014 2:33:49 PM
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Grids were on scopes long before the 70's.

http://en.wikipedia.org/wiki/Tektronix_analog_oscilloscopes

 Here is from 1950's!

http://richardsears.wordpress.com/2012/01/07/near-the-beginning-of-an-era-the-tektronix-511a/

Arthur Pini
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Re: Grids
Arthur Pini   6/12/2014 4:56:54 PM
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Hi bikeron,

Thanks for the great reference. It certainly shows the state of the art on the 1950's.

I agree that grids were associated with scopes from the very first commercial models.

The reference to the 1970's in the article was associated with the advent of cursors in scopes. 

 

Regards

Art

 

 

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