GDSBESv2025 Video Guide: 2.2 Stack functionality

Hello and welcome to this GDS BES tutorial video 2.2 Stack Functionality. The stacking functionality in GDS BES V 2025 allows users to improve the quality of recorded signals by averaging multiple shots. By stacking several repetitions of the same trigger, random noise is reduced and the true signal becomes clearer. Stacking can be performed in three modes. Manual Add to Stack, Manual Trigger with Auto Add to Stack and Automatic Sticky Trigger Stacking. So to perform a normal trigger you're going to have to navigate to the trigger button. You should have all of your other information filled out already and all you have to do is press trigger once. Then you need to observe the raw shot and this is the initial step for a basis stacking. So this gives you the data to then put down to the below graph. So after you run the trigger, this is the manual stacking side of it, you can then press Add to Stack. This adds the most recent shot to the stack memory. Now you want to repeat this process as many times as you want. If you get a dull shot or a shot that you don't think is relevant, you don't have to add that to the stack. But then when you do get one, you can then just press Add to Stack. So this is how you do it manually and it gives you full control over which shots are stored. Now you can do a manual trigger with Auto Add to Stack. So all you need to do is tick this checkbox Auto Add to Stack. Then each time you press trigger, the new shot is automatically added to the stack. This reduces the need to manually press Add to Stack after every shot. So this mode is a semi-automated version of the Add to Stack and the operator still controls when each trigger occurs, but stacking happens automatically. Now you have the sticky trigger or automatic stacking. First you need to enable sticky trigger mode and then you define the following parameters. The interval between shots, for example one second, and the number of shots to stack, for example ten shots. Then all you need to do is press trigger and then the system will automatically fire the set number of triggers at the defined interval and add each shot to the stack. Then as you can see, it will start to average out all the shots as they occur. So once multiple shots have been stacked, the software calculates an average waveform and that's what you see at the bottom. The average signal reduces noise and produces a clear representation of wave propagation. The stack data can then be used for peak picking, travel time measurement and velocity calculations. This is the fully automated mode, efficient for collecting many repetitions without manual intervention. So the keynotes here would be the best practice, use a sticky trigger for consistency when performing multiple repetitions. The main comparison is that manual and auto add modes are better suited for exploratory testing, while sticky trigger is ideal for final data capture. Anyway, this is the end of the video. Thank you so much for watching. This has been 2.2 Stack Functionality.