How long does it take for the memory in a YESDAS-2 datalogger to fill up?
A basic YESDAS-2 has 32Kb of built in memory, but most YESDAS systems are sold with memory card (PCMCIA) options. With the standard size 32Kb buffer, assuming an MFR-7 is connected and taking 15 second samples, the 32Kb buffer would fill up in approximately 30 hours. YESDAS Manager contains a built-in “projected memory usage calculator.” With a 1 MB memory card, a MFR-7 with YESDAS-2 can retrieve data for 40 days assuming sampling every 15 seconds and averaging four samples together before storing, i.e., one-minute storage intervals. It also assumes there are 12 hours of daylight at the site. A YESDAS-2 logs data during the daytime only. So, if there are fewer daylight hours at the site, say 10 hours, then the card would fill up in 48 days; if there are more daylight hours, you’ll have less time before it fills up. Also keep in mind that the MFR uses seven channels, and takes three measurements on each (direct-normal, diffuse, total), so 21 data points are stored for each sample. Most
