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English: Response of a LED-LDR optoisolator (vactrol) to a step change in LED current. Note that time scale is logarithmic!
  • Blue trace: response of a vactrol that was kept dark long enough. Owing to memory effect (common to all cadmium compounds), it overshoots steady-state resistance, initially going to a low "infinite dark" resistance (Rdh), then slowly recovers to steady-state target (black dashed line). Most cadmium compounds take hours to settle down completely (below measurement error), although some take weeks.
  • Red trace: response of a vactrol that was kept brightly illuminated. It overshoots in another direction, to a higher-than-expected value (Rlh).
  • Increase in resistance (red trace) is typically slower than decrease (blue trace).
Adapted from charts and textual information in PerkinElmer (2001). Photoconductive Cells and Analog Optoisolators (Vactrols®). pp. 7-11, 29, 34.
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Author East of Borschov

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current16:10, 25 November 2010Thumbnail for version as of 16:10, 25 November 2010829 × 755 (47 KB)East of Borschov{{Information |Description={{en|1=Response of a LED-LDR optoisolator (vactrol) to a step change in LED current. Note that time scale is logarithmic! Blue trace: response of a vactrol that was kept dark long enough. It overshoots steady-state resistance,

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