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VT33CT Datasheet(PDF) 41 Page - PerkinElmer Optoelectronics |
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VT33CT Datasheet(HTML) 41 Page - PerkinElmer Optoelectronics |
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41 / 76 page  36 Characteristics of Analog Optical Isolators Figure 3. Typical LED AOI Distortion Characteristics At high AC voltages, distortion to the waveform can be seen using an oscilloscope. The waveform is still symmetrical but contains the fundamental and the odd harmonics, the third harmonic being predominant. If there is DC as well as AC voltage on the photocell, both even and odd harmonics are generated. The RMS value of voltage or current is not very sensitive to a large third harmonic component, but the instantaneous value is. A 10% harmonic will only change the RMS values by 0.5%. If the output is used to control a thermal element, such as a thermal relay, circuit operation is not affected. Further, when the AOI is used in ON-OFF applications, waveform distortion is not a problem. (a) (b) (d) (c) |
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