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Interconnect Impact on Electrical Waveform Lab with Results - Page 3

post #31 of 114
This is an example of a baseband spectrum analyzer.
R&S®FMU36 Baseband Analyzer (Rohde & Schwarz International - Products & Services - Test & Measurement - Product Categories - Spectrum & Signal Analyzers)

Goes down to 1 hz and has a dynamic range of more than 140db.

No oscilliscope in the world can do this. Not even close.

My personal unit is a tektronix 7L14 which has a minimum of 40khz and a dynamic range of 120db.
Great for a lot of things, hard to use for cables.
post #32 of 114
Thread Starter 
Kevin,
Thanks for the info.
So the baseband analyzer is kind of like an oscilloscope on steroids correct?
The baseband analyzer would replace the oscilloscope in this lab right?

Regards,
Dave
post #33 of 114
Thread Starter 
Question for head-fiers,
Would using an audio analyzer such as -
R&S®UP350 Audio Analyzer (Rohde & Schwarz International - Products & Services - Test & Measurement - Product Categories - Audio Analyzers)
Be a viable option for this experiment instead of the oscilloscope+pulsegenerator? It has a dynamic range of 96dB and thusly a resolution of 16 bits with a frequency response of 10hz-80khz.

I would be pairing the audio analyzer with the TDR (time domain reflectometer) test and looking at both results.

My other option seems to be a pulse generator with a baseband analyzer because it provides much higher resolution (24 bit) and therefore dynamic range (144dB).

What is your input guys?

Regards,
Dave
post #34 of 114
Thread Starter 
UPDATE: E-mail from George Cardas,
Gave me a lot to think about, expect me to revise the OP at a later time.

Dave
post #35 of 114
Quote:
Originally Posted by myinitialsaredac View Post
Would using an audio analyzer such as -
R&S®UP350 Audio Analyzer (Rohde & Schwarz International - Products & Services - Test & Measurement - Product Categories - Audio Analyzers)
Be a viable option for this experiment instead of the oscilloscope+pulsegenerator? It has a dynamic range of 96dB and thusly a resolution of 16 bits with a frequency response of 10hz-80khz.
Hello,
The 140 db of dynamics of the spectrum analyser cannot be compared to the one of an oscilloscope or an audio analyzer, because it is 140 db after FFT, while the others give their dynamics before FFT. So the spectrum analyser may in fact have less dynamics than a 80 db oscilloscope.

The audio analyzer is a good option because you get many different measurments in it. The drawback is that it stops at 80 kHz, which prevents you to analyze the behaviour in the MHz range on square waves. Cardas will insist that this is essential, but beware that this is only his own point of view, and that it has no scientific background.

The audio band stops at 20 kHz. What happens beyond is irrelevant according to scientific studies, but essential according to subjective-biased opinions, like many experienced audiophiles' including Cardas.
This question has been the subject of many forum flame wars.
post #36 of 114
Thread Starter 
Pio,
I will be presenting an equipment list similar to the one I will be putting up shortly to the professors at NAU and see which equipment they have. I personally believe the audio analyzer may be a very good choice because at a 16 bit resolution is has a much greater dynamic range than even the best oscilloscope. I am in agreement that anything over 22 khz is meaningless in this test. However with the range of 10hz-80khz I will be well within the realm of human hearing.

Dave
post #37 of 114
Thread Starter 
UPDATE: Major revision of equipment list and variables in the OP.

Dave
post #38 of 114
Thread Starter 
UPDATE: I will be presenting the lab to my professor tomorrow to get approval, and also a definitive equipment list.

Cheers,

Dave
post #39 of 114
Thread Starter 
UPDATE: Presented the experimental procedures etc. to my professor and the design was approved. Should have a definative equipment list in three days.

Dave
post #40 of 114
Thread Starter 
UPDATE: Received an email from Mike at headroom, cleared up some issues.

Dave
post #41 of 114
Thread Starter 
UPDATE: Should have a definitive equipment list later today, expect revisions and possibly a support/donation thread to be born soon.

Dave
post #42 of 114
Thread Starter 
Still Waiting on a definitive equipment list...will update once received.

Dave
post #43 of 114
Thread Starter 
UPDATE: My science professor is still putting our pleas for equipment to her sources, but I have sent an inquiry to the Barrett Honors College looking for equipment or help finding a source.

Dave
post #44 of 114
Thread Starter 
UPDATE: Redid the layout of the experiment and fiddled with the wording a bit.

Dave
post #45 of 114
Thread Starter 
UPDATE: Got a hit from Barrett College (ASUs Honors college) for some equipment. Working on the logistics and specifics currently.

Will keep you all updated.

Dave
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