參數(shù)資料
型號(hào): VT900
廠商: PerkinElmer Inc.
英文描述: Photoconductive Cells and Analog Optoisolators (Vactrols)
中文描述: 光導(dǎo)細(xì)胞和模擬光隔離器(Vactrols)
文件頁(yè)數(shù): 41/76頁(yè)
文件大小: 1240K
代理商: VT900
36
Characteristics of Analog Optical Isolators
Figure 3. Typical LED AOI Distortion Characteristics
At high AC voltages, distortion to the waveformcan be seen using an
oscilloscope. The waveformis still symmetrical but contains the
fundamental and the odd harmonics, the third harmonic being
predomnant. 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, waveformdistortion is not a problem
(a)
(b)
(d)
(c)
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