With window-qualification selected, the channel triggers when inside or outside the specified voltage window. With level-qualification selected, the channel triggers when above or below the threshold. The channel A to B (or D, or H, depending on the number of inputs the oscilloscope has) controls have the most options. Instead of the AND function, you can combine the channels using NAND, OR, NOR, XOR or XNOR. The trigger condition became true in the middle of the trace, at time t=0, when Channel A was above 0 V at the same time that Channel B was below 0 V. In the image the trigger was set to “Channel A, level, above 0 V, Channel B, level, below 0 V, AND“. This trigger detects a logical combination of up to four of the scope’s inputs.
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