The TestM diagnostic mode offers 26 tests, which range from testing the cameras, touchscreen, microphone, and even the haptic engine, to a comprehensive stress test that pushes ...
Invisible problems are the hardest to fix, and until we evolve eyes that respond to radio waves, wireless will remain thoroughly out of sight. Radio engineers have long bypassed their organic shortcomings with specialised test equipment, the most highly prized of which is the spectrum analyzer. This sweeps through a band, plotting energy received at the frequencies where it’s found. With practice, all manner of problems can be recognised by the patterns they make.
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Caption by: Rupert Goodwins
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