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Assembly Checks
- verify no connector pins look soldered together
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- verify no pins on STM32 look shorted
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- verify all components for Flight 5.7V Variant are fitted
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- solder on radial capacitor for input buck
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- solder on test input leads for buck testing
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- verify pin 1 on chips aligns with indicator
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- plug/unplug cycles on connectors for reliability
Power Testing
DMM
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- Make sure no power rails are shorted to ground or each other with DMM
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- Slowly increase voltage (with low current limit, 100mA max) on buck input, check its not drawing excessive current/power (ensure no output load)
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- Probe the output net for voltage stability with DMM
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- Slowly increase voltage on internal
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- 5V rail
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- and verify the internal
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- 3.3V rail turns on (LDO functionality)
E-load
- Perform a load test on buck converter: use eload to fully saturate the buck and verify you get the output current expected (up to 1A)
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- Step the load and perform efficiency calculations: 12V, 24V, 50V
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Oscilloscope
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- Load transient testing:
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- Step the e-load and view the transient response from buck converter output
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- .
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- 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