ANALISIS KETAHANAN PRODUK SOLAR CELL BERBANTUAN SOFTWARE LOGGER PRO

ABSTRAKPenelitian ini bertujuan untuk menentukan kualitas solar cell pada nilai fill factor (ff) dan efisiensinya ( ). Data tegangan Vi dan Ii diambil secara otomatis menggunakan software logger pro dan menggunakan analisis persamaan eksponensial . Data diambil dari solar cell merk polikristal type (99×69) mm2 yang dipaparkan di depan sumber cahaya lampu bohlam philips 100W/220V sejauh 18 cm pada Ir sebesar 983, 344 W/m2. Nilai Pmax terbesar besar berada pada sudut kemiringan 30o sebesar 0,0231 watt. ff yaitu 67%, efisiensi 22%. Pada sudut 30o tersebut arah cahaya datang tegak lurus dengan bidang solar cell. Sedangkan ff terendah kemiringan 70o yaitu 0,5362 dan efisiensi 13%. Kata kunci: Fill factor dan efisiensi solar cell; logger pro. ABSTRACTThis study aims to determine the quality of solar cell on the value of the fill factor (ff) and efficiency (h). The voltage data Vi and Ii are taken automatically using logger pro software and using exponential equation analysis. The data was taken from polycrystalline solar cell type (99×69) mm2 which was presented in front of the light source of Philips lamp bulb 100W/220V as far as 18 cm at Ir of 983, 344 W/m2. The largest Pmax value is at a slope angle of 30o of 0,0231 watts. ff is 67%, efficiency is 22%. At the 30o angle the direction of the light comes perpendicular to the plane of the solar cell. While the lowest ff is 70o, which is 0,5362 and efficiency is 13%. Keywords: Fill factor and efficiency solar cell; logger pro.

Switch-On Delays in Multiplexed Automotive Brake Lamps

The purpose of this report is to outline some of the facts associated with automotive brake lamps so that a well-informed decision may be taken as to whether or not they are suitable for inclusion in a multiplex system. For background data, driver reaction time is defined and quantified at around 700 ms, with individuals tested falling in the range 280 ms-2 s. The rate at which a hard-wired brake lamp bulb increases its luminance is then examined; this is found to depend largely upon the impedance of the wiring that connects the bulb to the battery. A minimum level of intensity that the bulb must reach is decided upon (297 lm), and it is found that the hard-wired bulb takes between 105 ms (Rline=250 mΩ) and 135 ms (Rline=500 mΩ) to reach this level. A similar experiment carried out using the bulb driven by a multiplex system found it now took between 108 and 120 ms to reach the same level. The conclusion is that for the system tested there can be no justification for not multiplexing the brake lamp circuit on the grounds of system latency.

A Controlled-Interval Light Trap for Microlepidoptera

Although many traps have been designed to study the responses of Lepidoptera to light sources of various intensities and qualities (Gui et al., 1942; Taylor and Deay, 1950; Glick and Hollingsworth, 1954; Merkl and Pfrimmer, 1955; Frost, 1957), few have been designed for studies of flight periodicity. The first one designed for the latter purpose was described by Seamans and Gray (1934). It consisted of seven individual collecting units built into one structure, each unit being operated for one hour of the night. Interval light traps subsequently designed by Hutchins (1940), Nagel and Granovsky (1947), and Coon (Frost, 1952) are of the Minnesota type (Frost, 1952), having a lamp bulb, hood, baffle and funnel. Beneath the funnel is a turntable, which brings a series of collecting jars under the spout of the funnel at regulated intervals. The Rothamstead trap (Williams, 1935, 1948) is also based on a bottle-changing mechanism.