Spectrum analyzers, network analyzers, optical spectrum analyzers, optical network analyzers, optical time domain reflectmeter, digital multimeters, DC voltage/current generators, multi-channel digital recorder, frequency counters, pulse pattern generators, error detectors, protocol analyzers, digital spectrum analyzers, bluetooth tester, laser diode test system; applied electronic machines and apparatus, namely, testers for testing semiconductors, namely, large scale integrated circuits (LSI...