[[計算室]]
*信号強度と電圧の関係 [#yb6f957b]
|信号強度|電圧|
|S9+60dB|50mV|
|S9+50dB|15mV|
|S9+40dB|5mV|
|S9+30dB|1500μV|
|S9+20dB|500μV|
|S9+10dB|150μV|
|S9|50μV|
|S8|25μV|
|S7|12.5μV|
|S6|6μV|
|S5|3μV|
|S4|1.5μV|
|S3|0.75μV|
|S2|0.3μV|
|S1|0.15μV|
S9で50μV S9+10ｄBで150μVです 約３倍~
&mimetex(x=20\log{3}=9.54); 約10dBです。
S9で50μV S9+30dbで1500μV 約30倍~
&mimetex(x=20\log{30}=29.54); 30dBです。
参考
log10 2 ≒ 0.3010
log10 3 ≒ 0.4771
log10 7 ≒ 0.8451
----
*常用対数表 一覧 [#q2666e9c]
|log|0|1|2|3|4|5|6|7|8|9|
|1.0|.0000dB|.0043|.0086|.0128|.0170|.0212|.0253|.0294|.0334|.0374|
|1.1|.0414|.0453|.0492|.0531|.0569|.0607|.0645|.0682|.0719|.0755|
|1.2|.0792|.0828|.0864|.0899|.0934|.0969|.1004|.1038|.1072|.1106|
|1.3|.1139|.1173|.1206|.1239|.1271|.1303|.1335|.1367|.1399|.1430|
|1.4|.1461|.1492|.1523|.1553|.1584|.1614|.1644|.1673|.1703|.1732|
|1.5|.1761|.1790|.1818|.1847|.1875|.1903|.1931|.1959|.1987|.2014|
|1.6|.2041|.2068|.2095|.2122|.2148|.2175|.2201|.2227|.2253|.2279|
|1.7|.2304|.2330|.2355|.2380|.2405|.2430|.2455|.2480|.2504|.2529|
|1.8|.2553|.2577|.2601|.2625|.2648|.2672|.2695|.2718|.2742|.2765|
|1.9|.2788|.2810|.2833|.2856|.2878|.2900|.2923|.2945|.2967|.2989|
|2.0|''.3010''|.3032|.3054|.3075|.3096|.3118|.3139|.3160|.3181|.3201|
|2.1|.3222|.3243|.3263|.3284|.3304|.3324|.3345|.3365|.3385|.3404|
|2.2|.3424|.3444|.3464|.3483|.3502|.3522|.3541|.3560|.3579|.3598|
|2.3|.3617|.3636|.3655|.3674|.3692|.3711|.3729|.3747|.3766|.3784|
|2.4|.3802|.3820|.3838|.3856|.3874|.3892|.3909|.3927|.3945|.3962|
|2.5|.3979|.3997|.4014|.4031|.4048|.4065|.4082|.4099|.4116|.4133|
|2.6|.4150|.4166|.4183|.4200|.4216|.4232|.4249|.4265|.4281|.4298|
|2.7|.4314|.4330|.4346|.4362|.4378|.4393|.4409|.4425|.4440|.4456|
|2.8|.4472|.4487|.4502|.4518|.4533|.4548|.4564|.4579|.4594|.4609|
|2.9|.4624|.4639|.4654|.4669|.4683|.4698|.4713|.4728|.4742|.4757|
|3.0|''.4771''|.4786|.4800|.4814|.4829|.4843|.4857|.4871|.4886|.4900|
|3.1|.4914|.4928|.4942|.4955|.4969|.4983|.4997|.5011|.5024|.5038|
|3.2|.5051|.5065|.5079|.5092|.5105|.5119|.5132|.5145|.5159|.5172|
|3.3|.5185|.5198|.5211|.5224|.5237|.5250|.5263|.5276|.5289|.5302|
|3.4|.5315|.5328|.5340|.5353|.5366|.5378|.5391|.5403|.5416|.5428|
|3.5|.5441|.5453|.5465|.5478|.5490|.5502|.5514|.5527|.5539|.5551|
|3.6|.5563|.5575|.5587|.5599|.5611|.5623|.5635|.5647|.5658|.5670|
|3.7|.5682|.5694|.5705|.5717|.5729|.5740|.5752|.5763|.5775|.5786|
|3.8|.5798|.5809|.5821|.5832|.5843|.5855|.5866|.5877|.5888|.5899|
|3.9|.5911|.5922|.5933|.5944|.5955|.5966|.5977|.5988|.5999|.6010|
|4.0|.6021|.6031|.6042|.6053|.6064|.6075|.6085|.6096|.6107|.6117|
|4.1|.6128|.6138|.6149|.6160|.6170|.6180|.6191|.6201|.6212|.6222|
|4.2|.6232|.6243|.6253|.6263|.6274|.6284|.6294|.6304|.6314|.6325|
|4.3|.6335|.6345|.6355|.6365|.6375|.6385|.6395|.6405|.6415|.6425|
|4.4|.6435|.6444|.6454|.6464|.6474|.6484|.6493|.6503|.6513|.6522|
|4.5|.6532|.6542|.6551|.6561|.6571|.6580|.6590|.6599|.6609|.6618|
|4.6|.6628|.6637|.6646|.6656|.6665|.6675|.6684|.6693|.6702|.6712|
|4.7|.6721|.6730|.6739|.6749|.6758|.6767|.6776|.6785|.6794|.6803|
|4.8|.6812|.6821|.6830|.6839|.6848|.6857|.6866|.6875|.6884|.6893|
|4.9|.6902|.6911|.6920|.6928|.6937|.6946|.6955|.6964|.6972|.6981|
|5.0|''.6990''|.6998|.7007|.7016|.7024|.7033|.7042|.7050|.7059|.7067|
|5.1|.7076|.7084|.7093|.7101|.7110|.7118|.7126|.7135|.7143|.7152|
|5.2|.7160|.7168|.7177|.7185|.7193|.7202|.7210|.7218|.7226|.7235|
|5.3|.7243|.7251|.7259|.7267|.7275|.7284|.7292|.7300|.7308|.7316|
|5.4|.7324|.7332|.7340|.7348|.7356|.7364|.7372|.7380|.7388|.7396|
|5.5|.7404|.7412|.7419|.7427|.7435|.7443|.7451|.7459|.7466|.7474|
|5.6|.7482|.7490|.7497|.7505|.7513|.7520|.7528|.7536|.7543|.7551|
|5.7|.7559|.7566|.7574|.7582|.7589|.7597|.7604|.7612|.7619|.7627|
|5.8|.7634|.7642|.7649|.7657|.7664|.7672|.7679|.7686|.7694|.7701|
|5.9|.7709|.7716|.7723|.7731|.7738|.7745|.7752|.7760|.7767|.7774|
|6.0|.7782|.7789|.7796|.7803|.7810|.7818|.7825|.7832|.7839|.7846|
|6.1|.7853|.7860|.7868|.7875|.7882|.7889|.7896|.7903|.7910|.7917|
|6.2|.7924|.7931|.7938|.7945|.7952|.7959|.7966|.7973|.7980|.7987|
|6.3|.7993|.8000|.8007|.8014|.8021|.8028|.8035|.8041|.8048|.8055|
|6.4|.8062|.8069|.8075|.8082|.8089|.8096|.8102|.8109|.8116|.8122|
|6.5|.8129|.8136|.8142|.8149|.8156|.8162|.8169|.8176|.8182|.8189|
|6.6|.8195|.8202|.8209|.8215|.8222|.8228|.8235|.8241|.8248|.8254|
|6.7|.8261|.8267|.8274|.8280|.8287|.8293|.8299|.8306|.8312|.8319|
|6.8|.8325|.8331|.8338|.8344|.8351|.8357|.8363|.8370|.8376|.8382|
|6.9|.8388|.8395|.8401|.8407|.8414|.8420|.8426|.8432|.8439|.8445|
|7.0|''.8451''|.8457|.8463|.8470|.8476|.8482|.8488|.8494|.8500|.8506|
|7.1|.8513|.8519|.8525|.8531|.8537|.8543|.8549|.8555|.8561|.8567|
|7.2|.8573|.8579|.8585|.8591|.8597|.8603|.8609|.8615|.8621|.8627|
|7.3|.8633|.8639|.8645|.8651|.8657|.8663|.8669|.8675|.8681|.8686|
|7.4|.8692|.8698|.8704|.8710|.8716|.8722|.8727|.8733|.8739|.8745|
|7.5|.8751|.8756|.8762|.8768|.8774|.8779|.8785|.8791|.8797|.8802|
|7.6|.8808|.8814|.8820|.8825|.8831|.8837|.8842|.8848|.8854|.8859|
|7.7|.8865|.8871|.8876|.8882|.8887|.8893|.8899|.8904|.8910|.8915|
|7.8|.8921|.8927|.8932|.8938|.8943|.8949|.8954|.8960|.8965|.8971|
|7.9|.8976|.8982|.8987|.8993|.8998|.9004|.9009|.9015|.9020|.9025|
|8.0|.9031|.9036|.9042|.9047|.9053|.9058|.9063|.9069|.9074|.9079|
|8.1|.9085|.9090|.9096|.9101|.9106|.9112|.9117|.9122|.9128|.9133|
|8.2|.9138|.9143|.9149|.9154|.9159|.9165|.9170|.9175|.9180|.9186|
|8.3|.9191|.9196|.9201|.9206|.9212|.9217|.9222|.9227|.9232|.9238|
|8.4|.9243|.9248|.9253|.9258|.9263|.9269|.9274|.9279|.9284|.9289|
|8.5|.9294|.9299|.9304|.9309|.9315|.9320|.9325|.9330|.9335|.9340|
|8.6|.9345|.9350|.9355|.9360|.9365|.9370|.9375|.9380|.9385|.9390|
|8.7|.9395|.9400|.9405|.9410|.9415|.9420|.9425|.9430|.9435|.9440|
|8.8|.9445|.9450|.9455|.9460|.9465|.9469|.9474|.9479|.9484|.9489|
|8.9|.9494|.9499|.9504|.9509|.9513|.9518|.9523|.9528|.9533|.9538|
|9.0|.9542|.9547|.9552|.9557|.9562|.9566|.9571|.9576|.9581|.9586|
|9.1|.9590|.9595|.9600|.9605|.9609|.9614|.9619|.9624|.9628|.9633|
|9.2|.9638|.9643|.9647|.9652|.9657|.9661|.9666|.9671|.9675|.9680|
|9.3|.9685|.9689|.9694|.9699|.9703|.9708|.9713|.9717|.9722|.9727|
|9.4|.9731|.9736|.9741|.9745|.9750|.9754|.9759|.9763|.9768|.9773|
|9.5|.9777|.9782|.9786|.9791|.9795|.9800|.9805|.9809|.9814|.9818|
|9.6|.9823|.9827|.9832|.9836|.9841|.9845|.9850|.9854|.9859|.9863|
|9.7|.9868|.9872|.9877|.9881|.9886|.9890|.9894|.9899|.9903|.9908|
|9.8|.9912|.9917|.9921|.9926|.9930|.9934|.9939|.9943|.9948|.9952|
|9.9|.9956|.9961|.9965|.9969|.9974|.9978|.9983|.9987|.9991|.9996|
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