20240626 Test

Goal: Make sure efuses are soldered properly & Test efuses over current protection and short circuit protections

Pre-test preparation:

1. Try to borrow an eload from Rover or Midnight Sun,

   1. if you can’t borrow the eload, make your own eload. Find the XT60 connector with around 10 resistors soldered together, it should have resistance labelled on it, around 1.67 ohm if I recall correctly. It is in a yellow connector organizer kit.

2. Set up eload if you can borrow one

3. Set up scope

   1. Vin channel

   2. Vout channel

   3. Iout channel, for this you need a current probe and it needs a 9V alkaline battery (Rockery has 9V battery if we don’t have any battery left)

4. Lift R1 to disable buck

5. Solder a wire at C15, connect power supply here to inject 6V

6. For each efuse,

   1. Solder 2 wires at output, use one wire for load and another wire to measure Vout;

   2. Solder 1 wire at input to measure Vin

7. Solder multiple ground wires

Test plan:

Check

• No shorts caused by soldering rework on the PCB

• Vout is 6V

• Current Probe is working

Over Current Test

1. Connect load

2. Set Oscilloscope to Normal, trigger around 0.1 - 0.3A, we want to see the efuse retrying

3. Turn on power supply

4. Take a photo of Oscilloscope screen

5. Repeat for all efuses

Short-to-ground Test

1. Set Oscilloscope to Normal, trigger around 0.1 - 0.3A, we want to see the efuse retrying

2. Turn on power supply

3. use the load wire at efuse output, short it to any ground on the PCB (seeing spark is fine)

4. Take a photo of Oscilloscope screen

5. Repeat for all efuses

Battery Inrush Test

make sure to use a old battery

1. Solder input XT60 connector

2. Probe Buck Vin, Sw node, Buck Vout, Buck Iout. Label the channels

3. Set eload to Load imax which is 4A at buck output

4. Set eload slew rate to max

5. Turn on eload

6. Set oscilloscope to single, trigger on half of buck vin rising edge

7. Plug in battery

   1. Pray nothing burns lol

8. Take a photo of oscilloscope screen