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Lamp test setup Here's a more specialized test setup that includes an oscilloscope for the analysis of the time-dependent characteristics of the lamp, a high-voltage cold-cathode fluorescent tube. Keywords: Miscellaneous

Lamp test setup


Here's a more specialized test setup that includes an oscilloscope for the analysis of the time-dependent characteristics of the lamp, a high-voltage cold-cathode fluorescent tube.
_DSC2776m.jpg _DSC2788m.jpg test-setup.jpg Set-up_with_reference_lamp.jpg IMG_1077b.jpg
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Filename:test-setup.jpg
Album name:Max / Misc lamps and lighting
Keywords:Miscellaneous
Filesize:953 KiB
Date added:07 Sep 2024
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URL:https://trad-lighting.net/gallery/displayimage.php?pid=479
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Comment 1 to 8 of 8
Page: 1

Ria   [Sat 07 Sep 2024 at 11:48]
Nice setup. We must see if we can get our oscilloscope working again, it was playing up last time we used it Confused
Tuopeek   [Sun 08 Sep 2024 at 13:16]
Surely the voltage across the lamp is too high for the scope, at least at pre-strike. Can't work it out from the picture, are your probes capacitively coupled?🤔
Ria   [Sun 08 Sep 2024 at 15:54]
Shouldn't the device being tested should be fed from an isolation transformer..? Wonder
Max   [Sun 08 Sep 2024 at 19:29]
Yes, I took some liberties here but I made sure this was still a safe experiment.

Tueopeek - I used a 100:1 probe suitable for measurements at several kVs. Of course, I attached the probe only after the lamp ignition, and during full regime the voltage is not that high (446 Vrms).
Ria   [Sun 08 Sep 2024 at 19:43]
Someone we follow on Youtube (John Ward) made a voltage divider consisting of 10 x 1㏁ resistors in series so that (on 230/240V) mains you get no more than 24V going into the scope. Might see about making one of those.
Max   [Sun 08 Sep 2024 at 19:48]
Such voltage divider is good enough at mains frequency, but if you want to reproduce complex waveshapes accurately then you have to account for the capacitance as well. There are some design rules that need to be respected if you want to have a probe transfer function which is not strongly dependent on frequency.
Ria   [Sun 08 Sep 2024 at 20:00]
That's true, but we're unlikely to need that. We'll see, anyway.
Max   [Mon 09 Sep 2024 at 20:30]
Depends on your application, but if you want to properly measure the voltage waveform of a mains-driven discharge lamp you will certainly need a proper probe.

Comment 1 to 8 of 8
Page: 1