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Author Topic: ESR meter and ....the fairy tales of the cap-kits...  (Read 4758 times)
Etienne MacGyver
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« Reply #30 on: January 24, 2012, 04:50:47 PM »

you can use a multimeter to check the charge of a cap, after that you can start to worry how to discharge it  Wink

EDIT:

Maybe this helps a bit:
http://www.repairfaq.org/sam/captest.htm#ctsdc
« Last Edit: January 24, 2012, 04:54:03 PM by Etienne » Logged

chrischris
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« Reply #31 on: January 24, 2012, 05:11:36 PM »

Does that means I should have a whole range of resistors handy... Huh?
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Etienne MacGyver
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« Reply #32 on: January 24, 2012, 05:18:18 PM »

No i dont think so, i think if there is charge in a cap, and you connect a lamp like you said, then the most of the juice is out
to be very sure, put a insulated screwdriver between the terminals and short it.
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chrischris
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« Reply #33 on: January 24, 2012, 05:59:03 PM »

Will try, thanks for the tips!
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Belike
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« Reply #34 on: January 24, 2012, 06:27:21 PM »

Will try, thanks for the tips!
Take care Chris, don't blow yourself up! Cheesy
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Looking for a Zaccaria TRON!!!, Zaccaria Dodgem pcb.
Etienne MacGyver
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« Reply #35 on: January 24, 2012, 07:41:27 PM »

http://www.youtube.com/watch?feature=endscreen&v=aQXy99SGuFg&NR=1
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Level42
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« Reply #36 on: January 24, 2012, 10:38:27 PM »

Excellent way to destroy your caps......
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Etienne MacGyver
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« Reply #37 on: January 25, 2012, 07:46:48 AM »

Yeah, it was to show that there can be a pretty big force in a cap with just 20 volts.

you can ofcourse just connect the multimeter and wait for it to reach zero.
you see in the vid that the voltage is dropping by just waiting with the meter connected.

i always just desolder them without shorting them
most of the caps are drained in circuit anyway

and i dont think that there is anybody that stupid to desolder it with the board connected and/or plugged in and/or in operation  Grin
« Last Edit: January 25, 2012, 07:48:37 AM by Etienne » Logged

chrischris
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« Reply #38 on: January 25, 2012, 09:07:03 AM »

That's the thing: I want to be able to measure them without desoldering them.
I contacted Mike, the guy who sells the Russian meter (thanks Dre for the address) and the auto discharge feature is not ready yet on his meter.
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Level42
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« Reply #39 on: January 25, 2012, 01:14:28 PM »

Chris, as long as you havent powered up the PCB where the caps are  on for a while (a day or so) you wont have any left charges, except for really big caps like the main filter cap on a monitor chassis PCB or like Atari's Big Blue and caps like that...

Caps do discharge over time and the smaller ones are discharge rather quickly....
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chrischris
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« Reply #40 on: January 25, 2012, 01:30:08 PM »

Good info, thanks!
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Belike
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« Reply #41 on: January 25, 2012, 03:37:25 PM »

Chris, as long as you havent powered up the PCB where the caps are  on for a while (a day or so) you wont have any left charges, except for really big caps like the main filter cap on a monitor chassis PCB or like Atari's Big Blue and caps like that...

Caps do discharge over time and the smaller ones are discharge rather quickly....
Confirmed, I tested hundreds of pcb and chassis caps with mine and never indicated that the discharge function is active.
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Etienne MacGyver
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« Reply #42 on: January 28, 2012, 04:20:49 PM »

More fun with caps right here  Cheesy

http://www.youtube.com/watch?v=EoWMF3VkI6U&feature=context&context=G2642cb1RVAAAAAAAAAA
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