| Author | Message | ||
     Mareklew Tinkerer Username: Mareklew Post Number: 33 Registered: 03-2010 Rating: N/A |
For most light meters, that are CdS based, one pot will adjust offset (roughly) and the other - sensitivity. As a rule of thumb the resistor in series with the cell will have to be adjusted to roughly the cell resistance in the middle of measurement range. But effectively you will need some reference light source and reference meter, to adjust/verify at several points throughout the range. Since CdS meters are inherently non-linear you will have to figure out a setting that will result in a minimal error at all light levels (it will be always possible to fit two points, but it may lead to an excessive error somewhere else on the curve). Marek |