Hi everybody,
I recently had a chance to get rid of some older HP printer/copier/scanner device. Therefore i have kept some parts like scanner light bar (i assume it is fluorescent light bar), few borads with components, 2 motors and 2 stepper motors.
After i removed scanner light bar and its inverter, i noticed some strange things.
1) The light source is strong when i look at it. It definitely gives me an unpleasant feeling in my eyes like if I was staring at something very bright. But if i try to light my room with it it is not so strong anymore. For close up lighting it is very good.
What is it that is hurting my eyes? Is it the whiteness, the brightness, the wrong wavelength? Is it worth trying to find a filter for it?
2) I just checked the output of inverter for curiosity.. Set my DMM to 600V AC, but no luck in there - just as i touch one of the terminals of transformer output with the lead of dmm it gives a constant little spark there of some frequency and the light goes of while i touch and it is sparking there
It is easier with light bulb disconnected, it is not as sparky anymore, but i can't see any voltage with my dmm. is shows 0,2V form time to time but that is it. Why is it behaving like that? Is my dmm way too stupid for this frequency? I have no idea what voltage i am playing with but i am sure it might bite my finger a bit if i touch it.
3) The voltage i am feeding the inverter with is 15V but it works on as low as 4,3V (haven't tried less) with less of the bar glowing. I gave it 15V because what is what i measured on the input of the inverter while the scanner was still somewhat functional. It was jumping between 12-17V, so i gave it the average value. What voltage should i run it normally? It has a 25V lytic cap on the input, so it should be not more than that.
It says 94-0V on the inverter. So is it the voltage i am working with??
I recently had a chance to get rid of some older HP printer/copier/scanner device. Therefore i have kept some parts like scanner light bar (i assume it is fluorescent light bar), few borads with components, 2 motors and 2 stepper motors.
After i removed scanner light bar and its inverter, i noticed some strange things.
1) The light source is strong when i look at it. It definitely gives me an unpleasant feeling in my eyes like if I was staring at something very bright. But if i try to light my room with it it is not so strong anymore. For close up lighting it is very good.
What is it that is hurting my eyes? Is it the whiteness, the brightness, the wrong wavelength? Is it worth trying to find a filter for it?
2) I just checked the output of inverter for curiosity.. Set my DMM to 600V AC, but no luck in there - just as i touch one of the terminals of transformer output with the lead of dmm it gives a constant little spark there of some frequency and the light goes of while i touch and it is sparking there
It is easier with light bulb disconnected, it is not as sparky anymore, but i can't see any voltage with my dmm. is shows 0,2V form time to time but that is it. Why is it behaving like that? Is my dmm way too stupid for this frequency? I have no idea what voltage i am playing with but i am sure it might bite my finger a bit if i touch it.
3) The voltage i am feeding the inverter with is 15V but it works on as low as 4,3V (haven't tried less) with less of the bar glowing. I gave it 15V because what is what i measured on the input of the inverter while the scanner was still somewhat functional. It was jumping between 12-17V, so i gave it the average value. What voltage should i run it normally? It has a 25V lytic cap on the input, so it should be not more than that.
It says 94-0V on the inverter. So is it the voltage i am working with??
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