it is recommended to use one of the following types for は下記のような無鉛ハンダの使用を推奨します。 the repair work. • Sn+Ag+Cu(錫 + 銀 + 銅) • Sn + Ag + Cu (tin + silver + copper) • Sn+Cu(錫 + 銅) • Sn + Cu (tin + copper) • Sn+Zn+Bi(錫 + 亜鉛 + ビスマス) • Sn + Zn + Bi (tin + zinc + bismuth) 注意: Caution: 無鉛ハンダの融点温度は通常の鉛入りハンダに比べ 30
......................... (Eq. 4-29) From Eq. 4-28 and Eq. 4-29, the signal-to-noise ratio becomes SN ratio = I ⁄ p p = ( IKα · 1 )1/2 2eB 1+1 ⁄ δ 1+1 ⁄ δ 1 2···+1 ⁄ δ 1 2··δ n With a = 1 the above equation can be simplified using Eq. 4-26, as follows: SN ratio ≈ ( IK · 1 )1/2 .......................