Originally Posted by SuPerDraGon
Nipple,
For cell voltage measurment, you do not need a high sampling rate A/D card.
Maybe I can try to borrow one from NI...do you know how to use Labview program? Maybe next year I can showcase your work during NI days.
I dun need the high sampling rate but rather higher bit for better resolution.
My current PicoTech datalogger is only 10bits, only giving me 5mv resolution. With a 12bits card, at least I can get 1.5mV resolution.
That are many other factors that why I'm not using a ADC with MicroController. Such as calibration and software interface. Eg. I'm using thermistor and it is non linear thus requiring a conversion table from manufacturer for better accuracy. Standard calculation is not very accurate. Although LM35 IC Temp sensor (Same as the one commonly found in our chargers such as Much More CTX) give linear and proportional voltage, but the thermal response is slow. And with the high dT/dt of the batt at the end of charge, the batt may be already over 50degrees but charger only show 45degrees.
RTD is quite expensive and thermocouple is not easy to setup to get accurate measurement as the lead wire itself will affect the measurement.
I only know basic LabView functions. Currently using Picolog and Picoscope.
BTW, what's this NIdays har? I always receive the email but never bother to read.
