Which option is listed as a possible self-test fail notice?

• A. battery low
• B. not enough signal
• C. calibration error
• D. thermal shutdown

Answer: (B)

Self-test checks verify the device’s ability to operate, including the integrity of the signal path. If the sensor input or radio link isn’t delivering a usable signal, the self-test will fail and report not enough signal. This directly flags a problem with signal reception or transmission, which is essential for reconnaissance gear to function properly.

Battery low is a power issue, not a signal issue; calibration error points to data alignment or measurement accuracy rather than signal quality; thermal shutdown relates to overheating. The listed self-test fail notice that matches the scenario of the device not receiving adequate signal is not enough signal.