audio, video and computer testing instrument system comprising power supply signal generator, logic generator, tone burst generator, TIM (transient inter modulation) tester, spectrum analyzer, vault meter, multimeter, scope pattern generator, IC (integrated circuit) tester, test probe, and blank computer discs; power supplies; weighing scales and cells; distance measuring instruments; calculators; data processors; computers and parts therefor; audio and video recorders and blank audio and vid...