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A review of the GWInstek 1054B

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maxwell3e10:
Regarding the digital gain it says in the HMCAD1511 datasheet: "There will be no missing codes for gain settings lower than 32x (30dB), due to higher than 8 bit resolution internally". This is actually surprising, that the ADC has intrinsically 13 bits!
But it seems that Instek is using it less than optimally. Instead of using this internal gain feature they must just multiply the output by a factor and end up with missing codes.

saturation:
It frankly doesn't matter, as the final output is limited by 8 bits or less as specified in the data sheet regardless of their internal bit length. 

As for whether the Instek code is at fault for producing the anomaly, you cannot say whether the effect is from Zynq SoC, the use of ADC internal gain or Instek's firmware code, or a bit of all. 

Regardless, since the DSO does what the GWInstek data sheet says it should do regardless of the gaps you examined, what you have found is an academic exercise, but no practical significance.





--- Quote from: maxwell3e10 on February 21, 2018, 07:36:03 pm ---Regarding the digital gain it says in the HMCAD1511 datasheet: "There will be no missing codes for gain settings lower than 32x (30dB), due to higher than 8 bit resolution internally". This is actually surprising, that the ADC has intrinsically 13 bits!
But it seems that Instek is using it less than optimally. Instead of using this internal gain feature they must just multiply the output by a factor and end up with missing codes.

--- End quote ---

maxwell3e10:
You really like to defend it! Anyway, even apart from these gaps, I am not that impressed. The input noise is rather high and on 1 mV/div setting the vertical resolution is very poor, less than 100 bits. I would say the only thing this scope has going for it is 4 vertical control knobs, one per channel, which is rare.

nctnico:
The 1mV/div range is zoomed indeed. Then again if you want to do sensitive measurements then you might want to use a (differential) amplifier anyway.

rauldm:
The Math channel can work with filter app? for example I put a equation in math channel like (atan(ch1/ch2)), Can get output of  this function filtered with filter app?

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