When the ISAR duration control is set to limit, how many seconds does ISAR remain before returning to the last selected search mode/range?

• A. 15 seconds
• B. 30 seconds
• C. 60 seconds
• D. 120 seconds

Answer: (B)

When ISAR duration control is set to limit, the system constrains ISAR imaging to a fixed window before returning to the prior search configuration. That fixed window is 30 seconds. So, ISAR remains active for 30 seconds and then automatically switches back to the last selected search mode and range. This keeps ISAR use bounded, preventing it from occupying the radar for too long and allowing a timely resume of standard scanning or tracking. The other time options would not reflect the defined behavior of the limit setting, which is specifically 30 seconds.