successfully updated the firmware to latest version and finished the calibration.
btw am not satisfied with the calibration, may be because of my DMM's quality( only the 1 ohm resistor is enough right? i have read something about 3.3 ohm resistor somewhere).
Everything below approx. 4 ohm should be ok. What kind of problem your have?
1-am not able to establish a serial communication with PC for getting a debug trace(*IDN returns nothing), only the programming port is working, native port is code10 as mentioned earlier in this thread.
and when i connected the usb cable directly to DUE's port, the PSU is always ON irrespective of the standby switch position, is that normal?
Yes, that is normal since Arduino Due is in that case powered from PC (over USB cable).
2- and just noticed that when the outputs are OFF, there is around -400mV present on the outputs and if i changed the current to non zero, it reduces to -50mV, is my PSU is ok?
Yes, it is.
Apologies for the delayed reply, was been away from PSU.
After calibration, there were offsets on both channel while measuring. i.e if I set 500mV, am getting around 530mV , same like for current also, the V/R calc is not matching.
also while current calibration, there is a drift when resistor is getting heating up. when to input the measured current? immediately or after stabilizing the reading?
and later found that the calibration mismatch is because of my DMM 3.5 digit and 0.5% accuracy only.
actually what kind of spec DMM you guys were using (and forum members too) for calibration? 5.5digit or 6.5digit?
what is the minimum spec needed?
while calibrating, the voltage input field can accept a maximum of 15 digit, but actually what is the optimum digit reading is recommended/needed (it takes 5.5 digit it seems)?
but in the calibration parameters on the channel calibration settings page shows different digit accuracy of the cal parametors.
in the 150mV calibration, the reading on my DMM were oscillating too much after the decimal point- which reading to take? (will confirm tomorrow in Cal center may be its my DMM)
as I dont have the equipment's,tomorrow i am taking my PSU to the calibration center for a perfect calibration, please suggest me a calibration procedure to perform there.
how much warm up time is needed before the calibration?
for voltage calibration, it can be measured with their calibrator DMM.
and how to do the current calibration there? programmable current generator?
Thanks.