E5-Cathode Ray Oscilloscope-Rev1

E5-Cathode Ray Oscilloscope-Rev1 - Nanyang Technological...

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Nanyang Technological University School of Physical and Mathematical Sciences Division of Physics and Applied Physics PAP 119 Physics Lab Ib Experiment 5: Cathode Ray Oscilloscope Background Cathode ray tubes (CRTs) were developed in the late 19th century. At that time, the tubes were in- tended primarily to demonstrate and explore the physics of electrons (then known as cathode rays). Karl Ferdinand Braun invented the CRT oscilloscope as a physics curiosity in 1897, by applying an oscillating signal to electrically charged deflector plates in a phosphor-coated CRT. Applying a refer- ence oscillating signal to the horizontal deflector plates and a test signal to the vertical deflector plates produced transient plots of electrical waveforms on the small phosphor screen. The CRT was not a true double beam type but used a split beam by placing a third plate between the vertical deflection plates. It was widely used during WWII for the development and servicing of radar equipment. Al- though extremely useful for examining the performance of pulse circuits it was not calibrated so could not be used as a measuring device. It was however useful in producing response curves of IF circuits and consequently a great aid in their accurate alignment. The CRT eventually evolved into the cathode ray oscilloscope (CRO), which is an electronic test
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This note was uploaded on 04/04/2012 for the course PHYSICS FE1001 taught by Professor Yap during the Spring '10 term at Nanyang Technological University.

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E5-Cathode Ray Oscilloscope-Rev1 - Nanyang Technological...

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