We are currently evaluating the LTC2380-24 for precise DC measurements in our Physics lab. For this, we bought the DC2289A in combination with the DC890. Surely, a DC590 or DC2026 with the QuickEval connector would be more suitable for DC measurements, but in theory the DC890 is equally capable to measure DC, or am I mistaken?
For the final lab installation we will not use any of the demo boards because we will need realtime control circuits.
Anyways, I tried to replicate a very basic measurement with the ADC that SHOULD looks like Figure 5 and Figure 6 (see attachment).
I replicated the histograms with a simple python script after capturing a few thousand samples using the PScope software.
However, I did not succeed, the noise looks much worse (in the range of multiple 100mV instead of micro Volts. Can someone explain how the measurement setup for these plots would look like? I am pretty certain that I am doing something fundamentally wrong. Or is the DC890 simply not capable of accuratly measuring DC voltages?
Here the histogram that I captured with PScope and plotted with python: