If pulse is repetitious, confirm that the power or voltage is lower than the “Pulse limiting power” or “Pulse limiting voltage” calculated by the following expression:
計算式 Calculation
Vp ＝
K P
´
R
´
T
/
τ
Pp ＝ K
2
×P×T/τ
耐パルス限界電圧
耐パルス限界電力
定格電力
抵抗値
繰り返し周期
パルス持続時間
抵抗器種類による係数
定格電圧
Pulse limiting voltage
Pulse limiting power
Power rating
Nominal resistance
Repeating period
Pulse duration
Constant
Rated voltage
Vp：
Pp：
P：
R：
T：
τ：
K：
Vr：
（V）
（W）
（W）
（Ω）
(sec）
(sec）
（V）
Vp or Pp
種類
Type
ASR
ASRM
係数
K
Constant: K
1.0
τ
T
Note1: T>10→T=10(sec), T/
τ
>1000→T/
τ
=1000
Note2: Vp<Vr→Vp=Vr
Note3: Vp and Pp are applied to temperature below 70℃. If temperature over 70℃,
decrease the Power rating “P” in accordance with the derating curve:Fig.1
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