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Measuring Distortions with the Scope:What you see is not what you really have..

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Martin72:
Just for curiosity I´ve measured our rigol DG1022Z with the Lecroy HDO6034A.
Using it´s spectrum option.
THD according to the spec 0.075% (seems to be a magic number... ;) ) 10Hz...20Khz.
What I really like on the HDO is the performance, it´s soo fast in everything...
Nevertheless, pics below.


markone:

--- Quote from: Martin72 on January 03, 2023, 06:36:03 pm ----snip
What I really like on the HDO is the performance, it´s soo fast in everything...
Nevertheless, pics below.

--- End quote ---

Just out of curiosity, how much money did your company spend for this piece of jewelry ?

Martin72:
If I remember it right, a little bit more than 13000€.
Including the poweranalyzer option, spectrum analyzer option and severeal serial decoding options.
It makes always sense to buy by lecroy directly, together with the waverunner 9054 we got 42% discount and payed appx 26k for both together.
And the performance in general is really good by both.
They´re pc-based systems (Intel core i5 with 4x3.2Ghz, 16GB RAM, windows10), multigrid display, etc., tons of upgrades avaible (SSD, more RAM, more memory, triggers, math, decoders and so on).
And the UI is superb, having the both everyday as "references", siglent did the job with the 2000x+ and HD very well.
The HDO is my personal favorite at work.


markone:

--- Quote from: Martin72 on January 03, 2023, 07:35:11 pm ---If I remember it right, a little bit more than 13000€.
Including the poweranalyzer option, spectrum analyzer option and severeal serial decoding options.
It makes always sense to buy by lecroy directly, together with the waverunner 9054 we got 42% discount and payed appx 26k for both together.
And the performance in general is really good by both.
They´re pc-based systems (Intel core i5 with 4x3.2Ghz, 16GB RAM, windows10), multigrid display, etc., tons of upgrades avaible (SSD, more RAM, more memory, triggers, math, decoders and so on).
And the UI is superb, having the both everyday as "references", siglent did the job with the 2000x+ and HD very well.
The HDO is my personal favorite at work.

--- End quote ---

I remember a smooth behavior also with an old 64Xs around 2008, it has been my favorite for 4 years (together a CP150 and ADP305) until i changed job, now it's time that i do not see/touch one and judging how things are getting here I think it will be unlikely that will happen again ...

Martin72:

--- Quote from: Martin72 link=topic=357170.msg4612261#msg4612261 ---
Hi,

The THD specification of the A1 says nothing about the number of measured harmonics, but the measuring range is given, 20hz to 40Khz.
Whether this also means that at a fundamental frequency of 1Khz it also measures up to the 40th harmonic, I don't know.
I will ask Neutrik.


--- End quote ---

Answer:

--- Quote ---The A1 does not work with the THD+N function via a frequency analysis (FFT) or the impulse response like a modern analyzer, rather it works with a notch filter to mask out the fundamental frequency. Ultimately, the measurement results with and without the fundamental frequency are then offset against each other.
The procedure with the notch filter does not allow to look specifically between the harmonics, therefore no measurement 'without N' is possible.

The number of detected harmonics depends on the generator frequency and the bandwidth of the analyzer. The analysis range for THD+N is 130 kHz for the A1, but only generator signals up to 40 kHz are possible. With a generator signal of 1 kHz, you therefore have the harmonics up to k130 in the result.
--- End quote ---

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