General > General Technical Chat
Got shocked by a CRT
james_s:
Sure but all you need is a wire and a screwdriver. Strip a few inches off one end of the wire and wrap that around the metal shaft of the screwdriver, then if you want to get fancy install an alligator clip on the other end of the wire. In a pinch you can just strip that end and hook it on the grounding strap that goes around the bell of the tube.
M4trix:
--- Quote from: Benta on January 25, 2021, 09:37:19 pm ---
--- Quote from: tom66 on January 25, 2021, 09:33:08 pm ---If you still have problems after some time, you probably should go to a doctor.
Depending on the energy of the discharge it is possible you have nerve damage (hopefully not permanent)
--- End quote ---
To be honest, I'd go to the ER. The main problem is heartbeat fluttering. Here, you'll normally be admitted for 24 hours with ECG monitoring.
--- End quote ---
+1
I had some zaps but never ended on the floor. ???
Edit: I would suggest using gloves as well. A bit pain in da arse till you get used to them. Now I can't work without them. Maybe it's OCD
kicking in. ;D
BrokenYugo:
--- Quote from: GerritMax on January 29, 2021, 11:13:30 pm ---Would something like this do the job ?
--- End quote ---
Bad idea to have nothing but a piece of heat shrink between you and 20+kV, the tool shown is for much lower voltage work. The point of using a screwdriver (like the old school clear acrylic handle ones) is you have the thick plastic handle to carefully hold in case your ground wire pops off or something.
helius:
I do not discharge CRTs unless I am going to be removing the anode cap or working in the vicinity of the LOPT/flyback. You should also avoid touching any of the neck pins as the screen (G1) voltage is there, but the tube does not store that voltage.
I am somewhat leery of the "screwdriver" method, for the reason that the spark may induce high currents in nearby wires or PCB traces. One approach I have used is to use a high-voltage probe with banana plugs and put it into the milliamp jacks of a DMM. The approximately 1 Gohm of the probe will slow the discharge down to a very safe level and it can be simultaneously monitored.
For all the talk about CRT discharging, a very important safety issue is usually overlooked, which is that the power supply section of the monitor chassis has much more dangerous capacitors. With 250VDC and thousands of uF, they can in fact kill you. The same caution needs to be exercised as with all mains connected power supplies. If there are no bleeders or they are open circuit, you need a way to discharge these caps before working in the PSU area.
M4trix:
Hm, josh132 created this thread 5 days ago. I wonder is he ok ? :-//
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