|[AMRadio] Average OP Age was BA Tr FS|
rbethman at comcast.net
Mon Jul 23 11:51:31 EDT 2007
I'm *LESS* concerned about the calculations, *OR* building the shunt.
I have *MUCH* more concern for the youngster when it comes to *making*
the High Voltage Probe!
What clue does he have about insulation thickness?
What about creapage distance?
Heathkit used to make and sell a 20KVDC HV probe. Has anyone priced a
new one lately?
Go ahead - take your 1KV VTVM and poke around a 3KV or 4KV power supply
- heck, even 2KV?!?!?!
Somebody is *going* to get seriously hurt!
Run a pair of 813s @ 2KV. Okay, whom is going to do what measurements?
THIS IS what *WE* are losing with *US* getting older! <I'm a young pup
Bob - N0DGN
> Depends on the meter movement. A FS=1mA meter movement is 1000 ohms
> per volt. So, in order to measure kV, the series shunt is 1Megohm per
> Therefore, if your DC volt meter reads 0 ~ 5, then 5Megohms would
> measure 5,000VDC at full scale.
> I think, though, you're asking more along the lines of "who, of the
> 'todays ham' crowd even posses the knowledge of how to build a meter
> shunt" and I've got to agree.
> Have you -seen- a test, recently? I got licensed in Feb of 1984, by
> two general class license holders. That was before the VE program.
> In September of that following year, was the last time the FCC came to
> San Antonio to administer tests. The VE program was -very- close
> behind (3 months or so, as I recall).
> 10 years after that, I helped out in the VE program, and Oh My
> Goodness!! The CW test is 'MULTIPLE GUESS'? (back when they -had- CW
> testing ~sigh~)
> The theory questions weren't much better...
> "What is the current through a 1k ohm resister if 1v is applied across
> A) 250 Amps
> B) 117VAC
> C) 47 ohms
> D) 100mA
> No, seriously.. it was -that- bad! And that was 13 years ago. Can
> you imagine how much further down the bar has been 'lowered' by the
> lobbyist/employers of the Yae-com-wood manufacturers of today?
> Wait... you (collectively) looked surprised....
> Oh, c'mon... you don't -really- think the ARRL lowered the standards
> of entry level Ham Radio licensing out of the goodness of their
> hearts, do you?
> "Money Talks"
> (you know the rest)
> 73 = Best Regards,
More information about the AMRadio mailing list
This page last updated 21 Oct 2017.