(The CF display code means filter-cleaning reminder.) We recommend cleaning the filter every 2 weeks or when the CF display code appears on the indoor unit display. This may be the cause of the issue with the temperature and noise. IEC: International Electrotechnical Commission, iec.org, made up from many national standards organizations.When the inside air filter has too much dust, your air conditioner is unable to draw in a sufficient amount of air. Its various activities were take over by about a half dozen other organizations. 1953 to 1957.ĮIA: Electronic Industries Alliance. RETMA: Radio Electronics Television Manufacturers' Association. The tighter tolerances mostly apply to small C0G capacitors and the looser tolerances to larger Class 2-4 ceramics.įor example, if you see. Once again, don't expect to find all possible combinations of values, dielectrics, and tolerances.
Table 5 shows the EIA tolerance codes for ceramic capacitors. With luck, you might also find the material (C0G, X7R, etc.) and voltage rating. Values below 10 pF may use "R" for a decimal point, 4R7 = 4.7 pF for example. This, like most marking systems, is based on the picofarad, the lowest common denominator of capacitance. On small through-hole ceramics, a two-number-plus-exponent system is often (but not always) used. However, the smaller the part gets, the less information you get until, on the smallest parts there may be nothing at all. If the manufacturer has lots of room (like on big electrolytics) they will usually print everything they can value, voltage rating, temperature rating, series, even country of manufacture. It would be nice if there was more consistency to capacitor markings.
Microwave capacitors go down to at least 50 fF, but are called 0.05 pF. "Femto farad " (fF) is used for things like RAM chip storage capacitors, but there are no discrete capacitors in that size range.
Nano is rather less common than micro and pico, but it still shows up. First, let's get our nomenclature straight.
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