Basic electrical test

  • Visual inspection passed

  • Short/continuity test of power rails to GND (power supplay current limiter)

  • Power‑on with bench PSU (current limit power source 50 mA; typically start < 20  mA)

  • Verify reference voltages/regulators 3,3 V +/- 0,3 V (only by problems)

  • Check power supplay

    • 12V -> max 18 mA

    • 24V -> max 9 mA

    • Overvoltage > 26V -> on power supplay current limiter activ

  • Basic comms (UART) and programming interface check (USB login on PC)

  • Record results (Form D1)

Equipment

  • Power source 30V/1A with current limiter (setting accuracy: 0,1 V and 1 mA)

  • Programming adapter (Open Boat Projects)

  • Digital voltmeter (measuring accuracy: 1 mA)

Test Circuit

../_images/Test_Schematic.png

Pic.: Test circuit

../_images/Test_Adapter.jpg

Pic.: Connected programming adapter to PCB

Test conditions

  • Setting power source

    • 50 mA currrent limit

  • Digital voltmeter

    • Current 200 mA range

  • Programming adapter

    • Connected to power source

    • Connected to digiatl voltmeter

    • USB connected to PC

../_images/Test_Circuit_Place.jpg

Pic.: Test place with test circuit

Test procedure

1. Set power source 12V

2. Connect programming adapter with PCB and switch power on (refer picture and pinning)

  • short led flash after powering

3. Check no-load current (max. 20 mA)

4. Set power source 24V

5. Check no-load current (max. 10 mA)

6. Set power source 30V

7. Check no-load current (current limiter activ)

Acceptance

  • Short led flash after powering (indicator CPU is workimg)

  • No power short cut

  • All currents in the range

  • Over voltage protection okay