The transformer of the P5 I am running produces hum occasionally and I could not find out why. Especially, when my centralized heater is running the same time with P5, I can hear the hum right away.
All the measurements are quite the same as when heater is not running.The P5 readings: 240V, load 30%, 280-300 watts; thd in 1.6-1.8%; thd out 0.1%. Running single sin wave.
Has anyone encountered the same situation? Any idea to reduce the hum? Thank you. I moved it a bit but cannot get rid of the hum. This does not happen often but when heater on, it tends to be quite often. So far my solution is if music on, no heater nor aircon. If aircon/heater then no music