Variac input/output current

"Daniel Watman" <pywo@optushome.com.au>
** So you only have a very vague idea of the actual **** RMS***
current
draw ???

Is there no AC rating plate on the laser's PSU ???

A DC supply draws much more AC current than simple math suggests.

Yep I barely have any idea how much it draws, I bought it off ebay and
don't
have it here yet. I will start a new thread when it arrives and I have
more
details...
Click to expand...


** Do you even know it is intended for 120 volt ???




............. Phil
 
"Daniel Watman"
"Phil Allison"

It is an argon laser that has a max tube current of 10A. I think the
supply uses PWM on the rectified and filtered line voltage to control
the current (voltage across the tube is ~100V),

** Hmmm, 10 amps at 100 volts = 1000 watts.

So Daniel has an 1 KW argon laser ??????

That is nothing short of a a military weapon.


I wish :)
You arent factoring the super high efficiency of argon lasers... 1000W in,
~50mW out.
Click to expand...


** A brief Google search shows that argon lasers are appallingly
nefficient - less than 1% in fact.

However, a 1kW argon tube should deliver about 2 to 5 watts of laser
light - enough to be ***VERY*** dangerous to people's eyes.



............ Phil
 
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:2hdv04FbngdbU1@uni-berlin.de...
"Daniel Watman"

"Phil Allison"

It is an argon laser that has a max tube current of 10A. I think the
supply uses PWM on the rectified and filtered line voltage to
control
the current (voltage across the tube is ~100V),

** Hmmm, 10 amps at 100 volts = 1000 watts.

So Daniel has an 1 KW argon laser ??????

That is nothing short of a a military weapon.


I wish :)
You arent factoring the super high efficiency of argon lasers... 1000W
in,
~50mW out.



** A brief Google search shows that argon lasers are appallingly
nefficient - less than 1% in fact.

However, a 1kW argon tube should deliver about 2 to 5 watts of laser
light - enough to be ***VERY*** dangerous to people's eyes.


........... Phil
Click to expand...
Nope, this one is rated for 40mW at end of life at 10A, doing around 60mW
now apparently. Multi-watt argon lasers usually need 3 phase power and water
cooling.
Sam's laser FAQ is the bible of hobby lasers, see there if interested.
http://www.repairfaq.org/sam/lasersam.htm

-Daniel
 
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:2hduosFb9k4lU1@uni-berlin.de...
"Daniel Watman" <pywo@optushome.com.au


** So you only have a very vague idea of the actual **** RMS***
current
draw ???

Is there no AC rating plate on the laser's PSU ???

A DC supply draws much more AC current than simple math suggests.

Yep I barely have any idea how much it draws, I bought it off ebay and
don't
have it here yet. I will start a new thread when it arrives and I have
more
details...



** Do you even know it is intended for 120 volt ???



............ Phil

Yes, that is one of the few things I know. Single phase 110-120V AC for
Click to expand...
sure. :)

-Daniel
 
"Daniel Watman"
"Phil Allison"

** A brief Google search shows that argon lasers are appallingly
nefficient - less than 1% in fact.

However, a 1kW argon tube should deliver about 2 to 5 watts of laser
light - enough to be ***VERY*** dangerous to people's eyes.



Nope, this one is rated for 40mW at end of life at 10A, doing around 60mW
now apparently. Multi-watt argon lasers usually need 3 phase power and
water
cooling.
Click to expand...


** Ones for sale on Ebay now give close to 0.1% of the DC input power as
laser light.

Your one is a real slug at only 0.006% !!!!!!




.............. Phil
 
"Daniel Watman" <
"Phil Allison"


A DC supply draws much more AC current than simple math
suggests.

Yep I barely have any idea how much it draws, I bought it off ebay and
don't have it here yet. I will start a new thread when it arrives and I
have
more details...


** Do you even know it is intended for 120 volt ???


Yes, that is one of the few things I know. Single phase 110-120V AC for
sure. :)
Click to expand...

** It most probably has no transformer of it own and just rectifies and
filters the incoming AC supply.

Could draw anything up to 20 amps **rms** at 120 volts AC to produce 100
volts DC at 10 amps at the tube.





............... Phil
 
"Phil Allison" <philallison@tpg.com.au> wrote in message
news:2he7scFc0qqgU1@uni-berlin.de...
"Daniel Watman"
"Phil Allison"


A DC supply draws much more AC current than simple math
suggests.

Yep I barely have any idea how much it draws, I bought it off ebay
and
don't have it here yet. I will start a new thread when it arrives and
I
have
more details...


** Do you even know it is intended for 120 volt ???


Yes, that is one of the few things I know. Single phase 110-120V AC for
sure. :)



** It most probably has no transformer of it own and just rectifies and
filters the incoming AC supply.

Could draw anything up to 20 amps **rms** at 120 volts AC to produce
100
volts DC at 10 amps at the tube.
Click to expand...
Heh, you might need to consult with Mr Arpit regarding economical domestic
high-current, single phase connections :)

Russ.
 
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