Discharging CRT anode and capacitors on a VT52 DECscope

From: der Mouse <mouse_at_Rodents.Montreal.QC.CA>
Date: Thu May 27 19:04:02 2004

>> In this process, be sure you keep your fingertips WELL away from the
>> metal shaft of the screwdriver.
> Considering the shaft is connected to ground through a very low
> resistance in your set-up, what's the harm in touching it ?

(a) You might knock the alligator clip loose.

(b) You or something else might knock the other alligator clip loose.

(c) The path, even if intact, is low resistance but not necessarily low
impedance; if the current spike can throw enough EMI to kill
semiconductors, it can generate enough back EMF to do unpleasant things
to people touching the HV end of it.

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Received on Thu May 27 2004 - 19:04:02 BST

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