| General > General Technical Chat |
| Got shocked by a CRT |
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| BrokenYugo:
--- Quote from: fordem on April 30, 2021, 01:23:31 pm --- Another one of his favorite tricks was to "walk" each student one-by-one through the power supply adjustment - he'd come over to your workstation, instruct you to put one hand in your pocket, hand you a plastic screwdriver and offer to hold the meter leads on the test points while you adjusted the voltage - the adjustment potentiometer was a few inches below the anode cap on the side of the CRT, right alongside your knuckles as you held that screwdriver, almost guaranteeing that as you twisted the pot, eyes on the meter display, that the knuckle of your pinky finger would hit the anode cap where there was just enough voltage to startle you. The lesson there was to always be aware of exactly where you were relative to the high voltage components. --- End quote --- Also that there are kinda degrees of HV insulation, and a lot of what you run into isn't really human rated. Similar problem in automotive with old pre coil on plug engines, aging ignition parts can and do arc through. You can tell who's been bit before by how close they're willing to come to the nominally insulated spark plugs wires and boots on a running engine. |
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