MAKE A MEME
View Large Image
| View Original: | Vactrol time response chart.png (829x755) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: Vactrol time response chart.png en 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 http //www datasheetcatalog org/datasheet/perkinelmer/VT500 pdf Photoconductive Cells and Analog Optoisolators Vactrols® pp 7-11 29 34 own East of Borschov 2010-11 Vactrol | ||||
