If you have a fixed period (as shown in the above pic), then measure either on-time or off-time with T1G (or T2G, T3G, etc) and subtract it from the total period. Simple math & you have your DC%.

If you have a varying period, use "Toggle Mode" to measure a period, then disable Toggle Mode and set up Single-Shot Mode to measure either on or off time. From there it is once again simple math.

Am I getting closer?

Mike