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Oscilloscope input noise comparison

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nctnico:

--- Quote from: maxwell3e10 on October 22, 2018, 07:58:08 pm ---Instek scopes make the best csv files from space point of view. They save only the waveform data in bits, so its typically only a single integer number for shorted input. It compresses down to 147 kB for 1 M data points. The only problem is that the preamble doesn't specify the volts/bit conversion in a very clear way. Its easy enough to scale the y axis and make the x axis.

--- End quote ---
Some clarification here: I choose the 'fast CSV file' method when creating the files on the GDS2204E. There is also a slower version which likely has the data in Volts but is also more bulky and probably takes more time to create.

Andreas:
Hello,

first measurements of PicoScope 5444A
8-Bit Mode with 1 GS/s and 1 Ms of data.
first with 200 MHz (full bandwidth)
and 2nd with 20 MHz (hardware filter).

Best y-resolution is 2mV/div (+/-10mV)
so I should vote for the comparison relative to the range.
Due to the low y-resoution it will not compare to devices with 0.5mV/div.

20 fold Y-Zoom in the diagram shows that the step width is 110 uV/step
so for the +/-10 mV range only 70% are used for the display (28.3 mV total range.)

Measurements are done with 50 Ohms terminator on one input.

the 200 MHz measurement shows 125.7uV AC rms (std dev).
with 200 MHz bandwidth this computes to 8.9 nV/sqrt(Hz) in average.
the 20 MHz measurement is around 11.7 nV/sqrt(Hz). (mostly quantisation noise)

from the .CSV data the timestamps have been removed so that 1Ms of data could be packed within the forum upload limits.
Also the mV output of the scope has been converted to Volts.

Next will be 16 Bit measurements in 16 Bit mode of the scope.

with best regards

Andreas


lordvader88:
can someone tell me and others that don't know, the basics here, whats the graph mean ? whats good/bad ?

nctnico:
The easiest way is to send it by Wetransfer or another file sharing service. There is no need to jump through all kinds of hoops to attach a file to a forum message.

Carrington:

--- Quote from: nctnico on October 26, 2018, 03:49:35 pm ---The easiest way is to send it by Wetransfer or another file sharing service. There is no need to jump through all kinds of hoops to attach a file to a forum message.

--- End quote ---
Absolutely, edited deleted. I was bored, sorry.  :)

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