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Picoscope Hack
egonotto:
Hello,
in PicoScope the entire memory is specified in bytes. Only in single trigger mode you can use it. Otherwise you only get half the memory because of double buffers. In 12 bit mode, a sample is 16 bit, so you have fewer samples.
The band width of my PicoScope 100MHz 5234A is greater than the band width of the PicoScope 200MHz 5444B
https://www.picotech.com/support/topic33731.html?&p=118661&hilit=egonotto#p118661
Best regards
egonotto
_Wim_:
--- Quote from: egonotto on November 27, 2022, 12:28:04 am ---in PicoScope the entire memory is specified in bytes. Only in single trigger mode you can use it. Otherwise you only get half the memory because of double buffers. In 12 bit mode, a sample is 16 bit, so you have fewer samples.
&p=118661&hilit=egonotto#p118661[/url]
--- End quote ---
Thanks, that indeed confirms what I was seeing.
--- Quote from: egonotto on November 27, 2022, 12:28:04 am ---The band width of my PicoScope 100MHz 5234A is greater than the band width of the PicoScope 200MHz 5444B
--- End quote ---
I would not have expected that. Did you check if zero ohm series resistors were installed at the inputs on both scopes, or did they make a mistake with your 5444B installing incorrect resistors? Did Pico ever reply to your question after you send them the PSDATA files?
_Wim_:
Hi Egonotto, another question, do you also see spurs @multiples of 62.5Mhz in FFT mode (8-bit mode) in your 5444bB? This are most probably coming the interleaved sampling of the hmcad1520 ADC. In 12-bit mode these appear every 31.25MHz.
_Wim_:
One more hardware difference between the low end model and the high ends models: a different clock is used. Not sure though if this is worthwhile to try and upgrade.
_Wim_:
--- Quote from: _Wim_ on November 27, 2022, 05:44:12 am ---Hi Egonotto, another question, do you also see spurs @multiples of 62.5Mhz in FFT mode (8-bit mode) in your 5444bB? This are most probably coming the interleaved sampling of the hmcad1520 ADC. In 12-bit mode these appear every 31.25MHz.
--- End quote ---
These are the spurs I was talking about. Still >70db SFDR, so it meets its spec...
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