Datalogging at xDevs.com

Multiple experiments with metrology and measurements test equipment (MTA) involved collecting data on Raspberry Pi and xDevs dataserver and generating live preview plot charts with D3.js library. After number of years doing so it is time to streamline the presentation a little bit going into 2024 year.

First the miniTEC air-bath was completely rebuild with new Laird TEC element for better efficiency and performance. Controller remained the same Keithley 2510 repaired some years back. Data collection process remained the same for now under the guidance by xDevs.com TECkit Python application.

Experiments in January involve verification of some temperature coefficient and stability of few ADR1000-based xDevs.com QVR modules for upcoming article. As key MTA in these runs three HP3458A were used in parallel, each monitoring output of three ADR1000 modules independently.

To ensure clean power and no ground loops causing small errors into measurement Fluke 792A bipolar battery power pack was used to provide juice to all zener modules.
Temporary conglomerate of wires and BNC adapters is a good demo how not to connect power supply to your devices as it got very messy :-).

Live page still use D3.js library but now charts data split into 5 different graphs.

One can see recent data run here – https://xdevs.com/hp3458abc_qvrs_adrs_tcrsweep_792_batt_powered_jan2024/.

Temperature data for separate miniTEC and megaTEC airbath is now collected and plotted on own graph, not cluttering into already busy main chart. Four charts from top to bottom are reusing same time horizontal axis. Very bottom 5th chart provides highlight analysis of temperature coefficient, replacing time horizontal scale into PT1000 PRT sensor temperature scale. Alpha, beta and zero TC point, as well as T=23°C absolute calculated output are now determined and presented from live data automatically.

Hopefully this will let readers to easier navigate in live data pages and simplify data verification in future articles.