At 5:48 PM +0000 11/21/04, Stuart Bell wrote:
2) If you do have to discharge the crt, don't go to the trouble of building the resistor/alligator clip device. Unless
your resistor is rated for HV operation, the HV will simply jump across it. This so-called "arc-over voltage" is only a few hundred volts for most resistors, so going to the trouble of including it makes no sense. To do it right, you'd need to string dozens of them in series, and carefully arrange them, say, in a helix around an insulator (this is in fact how high voltage resistors are constructed). It's more trouble than it's worth. Just make sure that the discharge is dumped well away from the logic board, or else you risk frying something there (another reason for not routinely discharging the crt just for the heck of it). My favorite method is to just to let it sit unplugged overnight. What little charge might remain will truly be inconsequential.
But after you have let it sit overnight go ahead and discharge it. That is standard technique for dealing with high voltage, even when it "should be" discharged, discharge it.
At least that is what we did where I worked on 100 KV circuits.
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