Testing voltage on monitor after discharge

smello

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Let's say I just discharged a monitor by prying a screwdriver under the anode with a cable attached to the chassis of the monitor. I repeated this process 3 times after waiting several minutes.

Now, what would be a way to test to ensure the voltage is gone. I was thinking using a multimeter, putting one lead on the anode, then the other lead on the chassis?

Also, I read that you should discharge before putting the anode back on. Same process as above, except that the "suction cup" won't be attached to the monitor?
 
Stick your screwdriver in one more time and see if you have a tiny spark or not. if not, then you can stick your finger in it and be okay.


And tubes can "regenerate" a small charge sometimes, which is why you discharge again before putting the anode back in...
 
Now, what would be a way to test to ensure the voltage is gone. I was thinking using a multimeter, putting one lead on the anode, then the other lead on the chassis?

You wouldn't want to do that. if there is enough of a charge you could blow your meter.

If you're super-paranoid about it, buy an HV probe...
 
You wouldn't want to do that. if there is enough of a charge you could blow your meter.

If you're super-paranoid about it, buy an HV probe...

I guess I would rather blow my meter than myself.

So to discharge before reinstalling, just take the anode and touch the screw driver to the clips, right? Just wanna ensure I do it right.
 
If you have the cup out, I just connect one alligator clip to the frame and stick the other end in the hole. no need for a screwdriver unless your can't do it this way without having your fingers close.

If your DAG wire (ground wire from neckboard to tube) will reach the hole, you can just stick that in there as that is what you're actually completing the circuit to when using the screwdriver and clips....
 
If you have the cup out, I just connect one alligator clip to the frame and stick the other end in the hole. no need for a screwdriver unless your can't do it this way without having your fingers close.

If your DAG wire (ground wire from neckboard to tube) will reach the hole, you can just stick that in there as that is what you're actually completing the circuit to when using the screwdriver and clips....

Oh, so when you discharge before putting the anode back in, you have to connect a clip to the hole in the monitor tube?
 
Oh, so when you discharge before putting the anode back in, you have to connect a clip to the hole in the monitor tube?

Yes.

It is the TUBE that you are actually discharging during the whole process.... not the wire. (anode lead)

The TUBE is what will bite ya.... not the wire.

It is the TUBE that can develop a charge just from sitting in the open air....not the wire.

See the pattern here?

The wire (anode lead) itself is only a HV issue when the monitor is ON.
 
Ok, Now I get it. So, when the anode clips are touching the inside of the tube, and you touch the screwdriver on it, it draws the power out from the tube. I thought the anode part was what built up energy. Now it's all making sense.....
 
Ok, Now I get it. So, when the anode clips are touching the inside of the tube, and you touch the screwdriver on it, it draws the power out from the tube.

Exactly.....

I thought the anode part was what built up energy.

It does..... it produces the high voltage when the monitor is ON.
When you turn the monitor OFF... it is the TUBE that can potentially "hold" the charge.



I would not recommend trying to discharge a monitor while it is turned on. ;)
 
Discharging several times before removing the anode cap is a waste of time. After that "crack" (or after you touch the anode clip with your probe) wait a second or two, then peel back the anode cap, and use the probe to compress the clip and remove.

To put it back on, absolutely, discharge before replacing the clip. It can build up a minor charge over time.
 
Discharging several times before removing the anode cap is a waste of time. After that "crack" (or after you touch the anode clip with your probe) wait a second or two, then peel back the anode cap, and use the probe to compress the clip and remove.

To put it back on, absolutely, discharge before replacing the clip. It can build up a minor charge over time.

no not a miner charge one knocked the hell out of me today made me fell like i was going to throw up PLEASE be very carefull Ron
 
The tube will re energize itself; triboelectric charge.

Make sure you ground out the hole on the tube everytime you work on it

current takes the easiest path and your body is a big resistor so grounding it out will save you from getting zapped


Ive get hit every once in awhile and its not fun just be careful and be confident you are safe before doing anything
 
i was installing a chasiss and my hand was higher into the tube than i thought , its a sitdown twin racer so i was bent down ,it knocked me back to the wall , i have a burn mark on my finger but i learn something today that i will never take these thing lightly in the future Ron
 
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