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18th Sep 2018, 9:34 pm | #41 |
Nonode
Join Date: Jun 2010
Location: Spalding, Peterborough, Cambridgeshire, UK.
Posts: 2,859
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Re: Lamp limiter plus Variac tip
I remember having some nerve conductivity tests at Addenbrookes hospital Cambridge. I was going ooh, ouch and getting very stresed. The doctor halted the test. Could not understand why I was so distressed by "only a few milliamps".
A different test was suggested which she said was not pleasant to patients. She explained it required an accupuncture type needle in my tongue tip and another inserted on top of my foot. This I agreed to and nowhere near as bad as the first test involving shocks. I was wired to a sensitive oscilloscope and af amplifier. I was crackling away like top band static crashes in Summer. They never did conclude much from all the tests I was put through. My wife, sitting outside with other waiting patients told me they all were horrified as to what their fate would be. She says my protestationjs during the first test were clearly audible in the corridoor seating area! A later mri scan showed the problem and I ended up with spine surgery! To this day I can still feel 28V dc and soon react very fast. Rob
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Apprehension creeping like a tube train up your spine - Cymbaline. Film More soundtrack - Pink Floyd |
19th Sep 2018, 12:49 am | #42 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Lamp limiter plus Variac tip
Yes Phil: the things which some of do in the furtherance of our science!
No, but seriously - I felt that it was high time I discovered just how much current actually 'hurt', since we've all had the occasional 'belt' now and again. Prior to my experiment, I did a bit of research on the 'Net: figures there indicted a much higher current than 2 mA before the 'YOW!' threshold was reached - although I do appreciate that that will vary from person to person. I was anticipating a current of about 15 - 20 mA. And, finally, I take your point about RCD operation. Hopefully, I'll never need to validate your figures involuntarily! Al. |
19th Sep 2018, 12:55 am | #43 | |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Lamp limiter plus Variac tip
Quote:
(With acknowledgements to Rudyard Kipling). Al. |
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19th Sep 2018, 1:32 am | #44 | |
Hexode
Join Date: Oct 2017
Location: Manchester, UK.
Posts: 363
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Re: Lamp limiter plus Variac tip
Quote:
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20th Sep 2018, 1:06 pm | #45 |
Hexode
Join Date: Jan 2012
Location: Weymouth, Dorset, UK.
Posts: 422
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Re: Lamp limiter plus Variac tip
Hey Robinshack my doctor wanted me to have a nerve conduction test last year I refused after having seen a video if it on youtube I decided I didn't fancy it one bit. Fortunately no one suggested sticking needles in me. I have no idea what my pain threshold is but at a guess would say its probably a few million. One thing I know for sure a belt from a 400 cycle supply is a lot more painful than straight mains or DC
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20th Sep 2018, 3:36 pm | #46 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,288
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Re: Lamp limiter plus Variac tip
Back on topic please.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |