loading

Power Inverter or DSO Problem?


Recently bought 2000w power board to play around. 

Sets DSO at 5mS/Div. The output frequency change intervally between 40Hz and 50Hz.

Sets DSO at 10mS/Div. The output frequency stable at 50Hz.

Please advice which once is the problem?

Update June 1, 2017

1. ...do you have a load on the power supply ?
With or without load, same results.
2. Try changing the scopes trigger level..
Getting same resulted too when changes the trigger level. 
3. Measures with multimeter. Get 49.98Hz and this is normal. 



Picture of Power Inverter or DSO Problem?
40hz.jpg
50hz.jpg

PS not the power supply at fault.

PPS, do you have a load on the power supply ?

Try changing the scopes trigger level

+1