"The Natural Philosopher" wrote in message
...
Arfa Daily wrote:


"Meat Plow" wrote in message
news
On Fri, 01 Apr 2011 21:46:53 +0100, Arfa Daily wrote:

"Robin" wrote in message
...
Arfa Daily wrote:
Anybody got a copy of the schematic that's in the back of the user
guide that they can scan for me, please ? I've searched all my files
and drawers high and low, and can't find my book anywhere ... I
thought that the 'net would be awash with copies of the schematic,
but
it seems only for the Mk 2, which is totally different to the MK 4.
TIA

Is it the circuit diagram at
http://www.radiomuseum.org/r/avo_uni...er_8_mk_i.html ?
(Registration necessary for download. I have not done it as mine's a
Mk II.)
--
Robin
PM may be sent to rbw0{at}hotmail{dot}com


Hi Robin, thanks for that. It would appear to be the correct one. Looks
as though you need to pay to become a member, so I will hold off for
now
until all the feelers that I have out, run dry. It's really annoying
because I have owned the meter from new when I was an apprentice, and I
have the book, which has the schematic in it, carefully filed away
somewhere, but I'm buggered if I can now find it. It is in a box file,
but said boxfile is not where I know it should be. Even more annoying
is
that I have damaged the meter by my own stupidity, so now have the need
to fix it ... :-(

Arfa

That's too bad. I have some old gear I used as an apprentice that have a
high value in the nostalgia department. An old EICO 232 VTVM, B&K 1801
freq. counter, Beckman Tech 310 DVM, Amprobe Amp Clamp and some other
things that I can't think of right now.




Yes, Meat. It's very frustrating. I cut my 'professional' teeth with that
meter, and it has served me faithfully over the years without serious
mishap. It is still in weekly use, but not quite the daily use that it
once was. For some types of repair, the swinging needle of a quality
instrument like this, is so much more appropriate than a digital type ...


Its a well known fact that the human eye can gain a rough ideas of what's
going on much faster with an analogue display, as it takes longer to read
a digital display, although in the end that is more accurate.

I have never felt the need for a DVM or DAM..99.99% of voltage and current
readings are of the 'is it within 20% of where it should be' flavour.

Mine are a couple of Taylor meters, the big one is 100k/V but neither has AC
current ranges.

The small one has an early proto-HF ESR bridge glued to the front panel,
which was abandoned because it blots out FM reception for about the radius
of the block of flats.

On the big one I dropped a pair of pliers on it and broke the glass - it now
has a strip of motorcycle helmet visor stuck on with superglue.

When the 30V high-ohms battery became unavailable I built a 30V (zener
shunted) blocking oscillator into the battery compartment, connected via a
pushbutton to the 1.5V low ohms battery.

There's a sort of cube of dust layer in the gap at the end of the
bookshelf - I think that might be it!

There's a couple of genuine old windy-handle Meggers laying about somewhere
too.