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Detailed parameters
| model number | H7421-40 | H7421-50 |
| 光阴极形状 | Round | Round |
| 光阴极尺寸 | Dia.5 mm | Dia.5 mm |
| 短波限 | 300 nm | 380 nm |
| 长波限 | 720 nm | 890 nm |
| peak wavelength | 580 nm | 800 nm |
| 尺寸(W x H x D) | 56.0 x 36.0 x 104.0 mm | 56.0 x 36.0 x 104.0 mm |
| Input Voltage | +4.5 to +5.5 V | +4.5 to +5.5 V |
| 输入电压（最大值） | 6 V | 6 V |
| 输入电流（最大值） | 50 mA | 50 mA |
| 计数灵敏度（典型值） | 300nm，6.3 x104 s-1・pW-1 | 400nm，3.3 x 104 s-1・pW-1 |
| 400nm，4.0 x 105 s-1・pW-1 | 500nm，1.6 x 105 s-1・pW-1 | |
| 500nm，7.0 x 105 s-1・pW-1 | 600nm，2.7 x 105 s-1・pW-1 | |
| 600nm，7.6 x 105 s-1・pW-1 | 700nm，3.4 x105 s-1・pW-1 | |
| 700nm，1.9 x 105 s-1・pW-1 | 800nm，3.9 x 105 s-1・pW-1 | |
| 900nm，2.8 x 103 s-1・pW-1 | ||
| 计数线性度 | 7.8 x105 s-1 | 3.9 x105 s-1 |
| Dark count (typical) | 100 s-1 | 125 s-1 |
| 暗计数（最大值） | 300 s-1 | 375 s-1 |
| 脉冲对分辨率 | 70 ns | 70 ns |
| 输出脉冲宽度 | 30 ns | 30 ns |
| 输出脉冲高度（最小值） | 3 V | 3 V |
| 输出脉冲高度（典型值） | 3.6 V | 3.6 V |
| 推荐负载电阻 | 50 Ω | 50 Ω |
| 信号输出逻辑 | Positive logic | Positive logic |
| Operating Temperature | +5 to +35 ℃ | +5 to +35 ℃ |
| Storage temperature | -20 to +50 ℃ | -20 to +50 ℃ |
| weights | 340 g | 340 g |
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