VT5005-17b
此功能与外部触发信号同步执行测量。
SMPL TRG IN端子是TTL电平和正极的输入端子/
负逻辑（可通过按键设置）。SMPL
TRG IN端子是TTL电平、正/负逻辑信号的输入端子。这个
每次输入边缘时，测量点（波长/频率）都会增加
检测到外部触发信号。因此，当外部
输入等于指定采样点数量的触发信号。（然而，
执行重复扫描时，将重复扫描，直到停止键
按下或直到不再输入触发信号。）
延迟时间（从检测到触发信号的时间到
采样时间）约为20µs。提供触发器
适合测量灵敏度的定时信号。可选延迟时间可以
设置为该特定延迟时间。使用EXT触发器设置的延迟键
键，0.0µs到1000.0µs范围可以设置为0.1µs的单位。
注意，设置测量点后，在
忽略到下一个测量点的移动。时间根据
测量波长带和采样点数量（采样间隔）。
由于SMPL TRG IN终端在内部上拉，因此可以将其设置为高电平
当它处于打开状态时，当它处于GND短路状态时，达到低电平。

This function performs measurement in synchronization with an external trigger signal. The SMPL TRG IN terminal is an input terminal on the TTL level and in positive/ negative logic (which can be set by the key). The SMPL TRG IN terminal is an input terminal for TTL level, positive/negative logic signals. The measurement points (wavelength/frequency) are incremented each time edges of input external trigger signals are detected. Thus, sweeping stops when a number of external trigger signals equaling the specified number of sampling points is input. (However, when the REPEAT sweep is performed, the sweep will be repeated until the STOP key is pressed or until trigger signals are no longer input.) The delay time (from the time when a trigger signal is detected until the time when the sampling is performed) specific to the instrument is about 20 µs. Supply the trigger signal at a timing appropriate for the measurement sensitivity. An optional delay time can be set to this specific delay time. With the DELAY key of the EXT TRIGGER SETTING key, the 0.0 µs to 1000.0 µs range can be set in units of 0.1 µs. Note that after the measurement points are set, input trigger signals during the movement to the next measurement point are ignored. The time varies depending on the measurement wavelength band and the number of sampling points (sampling intervals). Since the SMPL TRG IN terminal is pulled up internally, it can be set to the HIGH level while it is in the open state and to the LOW level while it is in the GND short state.