In reply to <[email protected]>'s message of Mon, 13 Jun 2016 00:11:54 +0200: Hi, [snip] > > >Thanks. I already have a temperature logger. Not so good butt it >works temporary. But I also need to logg the electric current (Ampere).
Run the current through an accurate series resistor (low value), and measure the voltage drop with the labjack. Choose a resistance value that gives you a voltage drop of on average about 1 volt over the resistor. That gives you some leeway on either side. You can always change the resistance value if it isn't satisfactory. Measure the total voltage drop across the electrolysis cell and series resistor too. This allows for all measurements to be relative to ground. The voltage over the cell is the total minus the drop over the resistor. You can vary the current through the cell by controlling the total voltage. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
