On MP 1.2.53 I am unable to calibrate the 3DR Power module.
The opion to enter the "APM input Voltage" has dissapeared frrom the Battery Monitor configuration page.
This is giving me a battery voltage calced of 10.9 volts against 11.28 volt measured on an Agilent 1272A multimeter (DC accuracy of 0.05%).
The calibration proceedure used to be to measure the 5 volts at the fuse on the APM 2.5 board and enter this value into the "APM input voltage" Field. As per this Wiki page: http://copter.ardupilot.com/wiki/measuring-your-battery-voltage-and-current-consumption-with-apm/
Has the PM calibration been deliberately removed or is this a bug?
Note that I have updated MP from the Help page.
Cheers all, Roger...
Replies
I had to calibrate both of my 3dr PM. It They were both reading 90 amp draw at idle and also 4-10 volts off from what the battery was at idle.
They work great now that they are calibrated.
if you want to calibrate it, switch to custom.
+1 I've just installed the latest MP and still I can't fix my voltage reading.
EDIT: From the GitHub: "The Power module is automatically calibrated. There is no longer any reason to do a manual calibration."
I'm about 0.8 Vault out from my multimeter's reading - this affects mAh calcs etc.
I think my problem comes from not using the power module as power supply - how now brown cow?