In article , ... Yes, it is usually best to use an appropriate resistor to discharge largeMessage 1 of 62 , Sep 1, 2010View SourceIn article <AANLkTi=7D3=AenNgc7ub_Ru4_tD7Ni+uZeTMMEbLTxYQ@...>,
Andrew Villeneuve <andrewmv@...> wrote:
> I usually bridge the cap terminals with a 10W 100ohm resistor, and thenYes, it is usually best to use an appropriate resistor to discharge large
> test with a meter to ensure it's drained. I don't know if this is the
> best/safest method, but it's never seemed to cause any damage to myself
> or the DUT.
capacitors. It is also a good idea to then short out the terminals with a
piece of wire and leave the short on until you are next ready to apply
Shorting the terminals of large capacitors with a screwdriver often caused
screwdrivers to have a somewhat shortened useful life!
Good designs always had a bleeder resistor permanently connected across
PSU capacitors to ensure the capacitors always discharged when power was
removed though, of course, you never took this for granted it you were
about to poke digits where residual voltage might exist if the bleed
I recall 30kV/inch. And if sharp edges or points (like wire ends) are involved, it can be far less than that. It only takes 6mA to kill. The voltage doesn tMessage 62 of 62 , Sep 4, 2010View SourceI recall 30kV/inch. And if sharp edges or points (like wire ends) are involved, it can be far less than that.
It only takes 6mA to kill. The voltage doesn't matter, except that you need enough to get the current to and through the body. Once that is achieved, the current does the entire job.
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----- Original Message -----
> From: "ae5ew" <ae5ew.us@...>
> To: "Electronics 101" <Electronics_101@yahoogroups.com>
> Sent: Saturday, September 4, 2010 3:08:46 AM
> Subject: [Electronics_101] Re: Best way to Discharge High Capacity Caps
> High voltage can and will jump gaps. About 100kv per inch.
> There must not be any sharp points in HV circuits. Spraying HV ions
> all over will not be good. That stray strand of a wire won't do much
> at 12v but at 50kv it will be spraying HV all over.
> Knowing this is also important when properly discharging an HV
> So, read about HV safety working rules.
> HV probes have the odd shape and material they do to protect you from
> HV Leakage.
> Charles AE5EW