It is possible to use the trigger function for the recorded data. However, the trigger function can be used for the data only from CH1 or CH2. To use the trigger function, the time length of the recorded data is necessary to be at least 3 frames or more of the analysis screen. If it is shorter than that, trigger cannot be applied.
For example, when the frequency range is 100 Hz and the sample point is 2048;
Time of 1 frame is 2048 ÷(100 ×2.56)=8 seconds, 3 times of it is 8×3=24, so at least 24 seconds of the recorded data is necessary.