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ALC60 and PSA12
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ALC60 and PSA12
I have a problem with my ALC60 system. When I turn up the "power", the beam intensity is not stable. It oscillates. Up to 10A is it no problem, but 10-12A it is oscillating VERY much.
I put my oscilloscope probe on the current measurement connectors (red and black 4mm connectors) on the ALC 60. At full power I got following readings:
2VDC with 0.8VAC peak-to-peak (+/- 0.4V) @100Hz.
This makes a max current of 12A and a min current of 8A during the oscillations. The 100Hz is of course the 4-diode bridge rectification. So the large capacitors can´t seem to stabilize to a good DC voltage.
Is it the tube or the PSA-12?
Best regards,
Magnus Pihl
I put my oscilloscope probe on the current measurement connectors (red and black 4mm connectors) on the ALC 60. At full power I got following readings:
2VDC with 0.8VAC peak-to-peak (+/- 0.4V) @100Hz.
This makes a max current of 12A and a min current of 8A during the oscillations. The 100Hz is of course the 4-diode bridge rectification. So the large capacitors can´t seem to stabilize to a good DC voltage.
Is it the tube or the PSA-12?
Best regards,
Magnus Pihl
Re: ALC60 and PSA12
dear magnus
its an old and public problem in your
power supply unit -psu
the capacitors ? hope its right , are old
and they can´t "smooth" the rest of waves
from the ac current if the dc current
bigger than 8 to 10 amps.
to remedy the oscilations, you must buy
new capacitors for your psu.
attention , the oscilation are not very good
for the lasertube .
hope you understand my letter,
greetings holger
<small>[ 24. Oktober 2002, 14:11: Beitrag editiert von: Holger (alc60x) ]</small>
its an old and public problem in your
power supply unit -psu
the capacitors ? hope its right , are old
and they can´t "smooth" the rest of waves
from the ac current if the dc current
bigger than 8 to 10 amps.
to remedy the oscilations, you must buy
new capacitors for your psu.
attention , the oscilation are not very good
for the lasertube .
hope you understand my letter,
greetings holger
<small>[ 24. Oktober 2002, 14:11: Beitrag editiert von: Holger (alc60x) ]</small>
Re: ALC60 and PSA12
I don't think that you can blame the PSU. The PSA12 is a newer model and i think that the capacitors are in pristine condition.
I think that the problem is the lasertube itself. Older tubes simply like to resonate
Maybe the tube is not warmed up sufficiently, you can't start the tube and raise the current, that's the death of every tube. Try starting the laser, wait for 2-3 minutes and then slowly increase the current to the max in small increments so that you are on max in about 5 minutes.
If your tube doesn't like that too, lower the current to the last stable setting.
And always keep in mind that the absolute max for a ALC60 is 10A. Everything higher kills the tube really fast.
(Ok that doesn't bother me, i was running my ALC60 up to 14A, but i had to pay the price, gross underpressure, but who cares on a tube like that...
regards,
gunnaR
I think that the problem is the lasertube itself. Older tubes simply like to resonate
Maybe the tube is not warmed up sufficiently, you can't start the tube and raise the current, that's the death of every tube. Try starting the laser, wait for 2-3 minutes and then slowly increase the current to the max in small increments so that you are on max in about 5 minutes.
If your tube doesn't like that too, lower the current to the last stable setting.
And always keep in mind that the absolute max for a ALC60 is 10A. Everything higher kills the tube really fast.
(Ok that doesn't bother me, i was running my ALC60 up to 14A, but i had to pay the price, gross underpressure, but who cares on a tube like that...
regards,
gunnaR
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