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计数单元
C8855-01
C8855-01 是一款带有 USB 接口的计数单元，当与光子计数头等结合使用时，可用作光子计数器。C8855-01 的计数器有两个计数电路（双计数器法），能够对输入信号进行计数，而不会出现任何死区时间。由于 C8855-01 兼容热插拔（兼容即插即用），它可以帮助您快速设置测量环境。您可以在 C8855-01 交付当天使用示例软件立即开始测量。
特点
USB 接口
随附示例软件
精确测量，无死区时间
双计数器方法
光子计数头电源
输出电压和电流：+5 V / 200 mA
可通过同一台 PC 操作多个单元（最大 16）
详细参数
| 参数 | 说明/值 | |
|---|---|---|
| 输入 | 输入信号数量 | 1 通道 |
| 信号输入电平 | CMOS 正逻辑（高电平：最小 2 V） | |
| 信号脉波宽度 | 8 ns 或更长 | |
| 输入阻抗 | 50 Ω | |
| 计数器 | 计数器方法 | 双计数器方法 |
| 最高计数率 | 50 MHz | |
| 最大计数器容量 | 232 计数/计数器门控 | |
| 计数器门控 | 计数器门控模式 | 仅内部计数器门控 |
| 内部计数器门控时间 (*1) | 50 µs 至 10 s（1、2、5 步幅） | |
| 触发器 | 触发方法 | 软件/外部触发器 |
| 外部触发信号 | TTL 负逻辑 | |
| ID 开关 (*2) | 0 至 F（十六进制数字） | |
| 常规输出部 | 集电极开路/2 位 | |
| 光子计数头的电压输出 | 最大 +5 V / 200 mA | |
| 操作系统 | Windows® 8.1/10 Pro | |
| 接口 | USB | |
| 电源电压 | 由 USB 总线电源供电 (*4) 最大 +7 V / 400 mA（由交流适配器供电） |
|
| 尺寸 (W × H × D) | 120 mm × 30 mm × 96 mm（不包括突出部分和电缆） | |
| 重量 | 250 g | |
| 工作环境温度/湿度 (*3) | +5 °C 至 +45 °C / 低于 80% | |
| 储存温度/湿度 (*3) | 0 °C 至 +50 °C / 低于 85% | |
| CE 标志 | 符合 IEC61326-1 1 组，B 类 | |
| 交流适配器 | 输入 | 交流 100 V 至交流 240 V |
| 输出 | +7 V / 1.6 A | |
备注
*1 C8855-01 不适用于需要时间分辨率高于 50 µs 的用途。
*2 当两个或多个 C8855-01 单元连接到同一台 PC 时，ID 开关用于设置 ID 编号。
*3 无冷凝。
*4 将通用输出部或恒定电压输出用于光子计数头时，从提供的交流适配器供电。
提供：CD-ROM（包含说明手册、设备驱动程序、DLL、示例软件*等） USB 电缆、交流适配器、交流电缆、电源输出连接器
*：从 National Instruments, Inc. 的 Lab VIEW™ 中对示例软件进行配置。
框图
外形尺寸图（单位：mm）
连接示例
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