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Troubleshoot desk lamp

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amdx
Guest

Sat Jan 12, 2019 7:45 pm   



After the hurricane and power outage I had a defective radio, computer
and desk lamp, all plugged into the same outlet. Nothing else electrical
in the house was damaged.
The lamp is fluorescent FML-27W-6500k it has 4 pins.

> https://www.amazon.com/Four-Tube-6500K-4-Pin-Light/dp/B0074RGI
The fixture has an electronic ballast.
The ballast looks clean, nothing odd except a unidentified minor smell.
Bringing my scope probe close I can tell it is oscillating. Although it
looks like a thin pulse at 1,458 Hz, (that doesn't seem right). I have
no idea what the output should look like. There are 4 pins and the
driver has 4 wires out to the bulb, all from different connections.
I want to know how to separate a defective bulb from a defective
driver without buying a new bulb.
Mikek

Jasen Betts
Guest

Sat Jan 12, 2019 10:38 pm   



On 2019-01-12, amdx <nojunk_at_knology.net> wrote:
Quote:
After the hurricane and power outage I had a defective radio, computer
and desk lamp, all plugged into the same outlet. Nothing else electrical
in the house was damaged.
The lamp is fluorescent FML-27W-6500k it has 4 pins.

https://www.amazon.com/Four-Tube-6500K-4-Pin-Light/dp/B0074RGI
The fixture has an electronic ballast.
The ballast looks clean, nothing odd except a unidentified minor smell.
Bringing my scope probe close I can tell it is oscillating. Although it
looks like a thin pulse at 1,458 Hz, (that doesn't seem right). I have
no idea what the output should look like. There are 4 pins and the
driver has 4 wires out to the bulb, all from different connections.
I want to know how to separate a defective bulb from a defective
driver without buying a new bulb.
Mikek


Test the bulb. - check the two filaments first. they should look like
resistors.

--
When I tried casting out nines I made a hash of it.

amdx
Guest

Sun Jan 13, 2019 2:45 am   



On 1/12/2019 2:38 PM, Jasen Betts wrote:
Quote:
On 2019-01-12, amdx <nojunk_at_knology.net> wrote:
After the hurricane and power outage I had a defective radio, computer
and desk lamp, all plugged into the same outlet. Nothing else electrical
in the house was damaged.
The lamp is fluorescent FML-27W-6500k it has 4 pins.

https://www.amazon.com/Four-Tube-6500K-4-Pin-Light/dp/B0074RGI
The fixture has an electronic ballast.
The ballast looks clean, nothing odd except a unidentified minor smell.
Bringing my scope probe close I can tell it is oscillating. Although it
looks like a thin pulse at 1,458 Hz, (that doesn't seem right). I have
no idea what the output should look like. There are 4 pins and the
driver has 4 wires out to the bulb, all from different connections.
I want to know how to separate a defective bulb from a defective
driver without buying a new bulb.
Mikek

Test the bulb. - check the two filaments first. they should look like
resistors.

OK, refreshed my memory. So this tube is like a long tube, a filament
at each end, heats the gas, a high voltage strikes the arc and then the
voltage decreases.
One side measures 2.68 Meg ohms (not my fingers) and the other side is
open.
So, I'll splurge for a new bulb.

Thanks, Mikek


Guest

Sun Jan 13, 2019 6:45 am   



On Sunday, 13 January 2019 01:03:45 UTC, amdx wrote:
Quote:
On 1/12/2019 2:38 PM, Jasen Betts wrote:
On 2019-01-12, amdx <nojunk_at_knology.net> wrote:
After the hurricane and power outage I had a defective radio, computer
and desk lamp, all plugged into the same outlet. Nothing else electrical
in the house was damaged.
The lamp is fluorescent FML-27W-6500k it has 4 pins.

https://www.amazon.com/Four-Tube-6500K-4-Pin-Light/dp/B0074RGI
The fixture has an electronic ballast.
The ballast looks clean, nothing odd except a unidentified minor smell.
Bringing my scope probe close I can tell it is oscillating. Although it
looks like a thin pulse at 1,458 Hz, (that doesn't seem right). I have
no idea what the output should look like. There are 4 pins and the
driver has 4 wires out to the bulb, all from different connections.
I want to know how to separate a defective bulb from a defective
driver without buying a new bulb.
Mikek

Test the bulb. - check the two filaments first. they should look like
resistors.

OK, refreshed my memory. So this tube is like a long tube, a filament
at each end, heats the gas, a high voltage strikes the arc and then the
voltage decreases.
One side measures 2.68 Meg ohms (not my fingers) and the other side is
open.
So, I'll splurge for a new bulb.

Thanks, Mikek


You could check the ballast first if you want by lashing up a 20w+ CFL tube to it.


NT

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