Assembly Checks
- Verify no connector pins look soldered together
- Verify no pins on STM32 look shorted
- Verify all components for Flight 5.7V Variant are fitted
- Solder on radial capacitor for input buck
- Solder on test input leads for buck testing
- Verify pin 1 on chips aligns with indicator
- Apply a few plug/unplug cycles on connectors to test solder joint quality
Power Testing
DMM
- Make sure no power rails are shorted to ground or each other with DMM
- Slowly increase voltage (with low current limit, 100mA max) on buck input, check its not drawing excessive current/power (ensure no output load)
- Probe the output net for voltage stability with DMM
- Slowly increase voltage on internal 5V rail and verify the internal 3.3V rail turns on (LDO functionality)
E-load
- Perform a load test on buck converter: use an e-load to fully saturate the buck and verify you get the output current expected (up to 1A)
- Step the load and perform efficiency calculations: 12V, 24V, 50V
Oscilloscope
- Load transient testing: Step the e-load and view the transient response from buck converter output.
- Battery inrush test: simulate hot-plugging a battery on the input terminal and view transient voltage spike/oscillations.
Then, handoff to firmware for testing.
Firmware Testing
attempt to flash boards
all leds functional
pwm output functional
CAN circuit functional
pixhawk servo CAN system test