How To Really Test Electronic Ballasts

I’ve watched many RUclips videos in the past for testing electronic ballast.
They always show you, that you, can check if it’s working or not with a multimeter.
They say “if there is a resistance, that means it doesn’t work. If there is no resistance, that means it’s working.”
But testing with a multimeter does not work all the time.
When I checked many of the ballasts that I had to work with, most of them, not only didn’t have any resistance, but ironically they did not working.
That’s how I found this way to be more effective.
As i said in the video this isnt probably the safest way, though many of you contractors and or electricians out there can find safer ways.

[@CFNguyen]

So if you dont have a spare ballasts for test like that way. How do you know if the ballast still good or not?
I mean if your friend call you come to fix the ballast, how do you test now.

[@ezodesignandbuild]

Everybody says you can test with multimeter, but in my case it didn’t work.
That’s why I find this way.
Even if the replacement bulbs are not working, that means ballasts are not good.
Basically my system is checking ballasts with working bulbs.

[@georgelausman3038]

I had the same problem - ballast tested OKAY, but it did not work. My problem was the fixture was totally dead.
It died over a period of time. First flicker, if left on it eventually recovered. Then it did not recovered, just flickered.
Finally it just died.
So I spent about two hours trying to find what works on the internet. Finally i found this post. It is nice to have company.
I carefully figured what I want: I have 4 lamps, T8 size (1'').
Now I was ready to make a trip to local Dome Depot and got a replacement.
Just installed - it works okay.