To verify consistency of the design’s performance we assembled around 30 units and performed all the tests on each of them.
There were one or two which were not passing. We also installed units in our homes and at some of our friends and family members. The team was debugging the failing devices while I started preparing to take the product to market. At this point I was confident that the design is good to build atleast 100 units. I gave the order for 100 units to PCB fabricator; plastics moulding person and asked my electronics components vendor to supply the required quantity. || Problem 10 || They had a lead time associated so I was focusing on the next steps i.e. packaging and labelling while the team was performing detailed tests on the design and mechanical fitment tolerances.
To expedite the testing we made a small test jig with a Digital Multi Meter (DMM) and a few switches on it. The test jig had a USB cable that connected to the device being testing. Once the device was powered on we manually noted down the readings from the Digital Multimeter. Anything measurement that was not within the specifications we would put aside for analysis.