expression
testing, testing
A standard phrase used when testing a microphone, literally meaning 'Today is fine weather.' It is a set expression, not used for actual weather reporting.
マイクのテストで「本日は晴天なり」と言った。
I said 'testing, testing' during the microphone check.
A fixed phrase used for microphone testing, chosen for its clear and distinct sounds. The exact origin is uncertain, but it has been a conventional test phrase in Japanese broadcasting.