"H. Neary" wrote in message
...
On Sun, 3 Apr 2011 02:02:32 +0100, "Arfa Daily"
wrote:
"Meat Plow" wrote in message
news
On Sat, 02 Apr 2011 10:45:22 +0100, 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 ...
Arfa
--
I got used to the LCD after using one for 25 years but it took awhile
after using the EICO and a Simpson. The Beckman 310 was the first LCD I
owned. I found a benchtop Beckman with LED's back in the 90's I used for
several years before it failed beyond repair. Now using my faithful
Fluke
77. This is one that had a touch hold button in the middle of the
selector. It's hard to put aside the tools you've learned to trust after
decades.
Indeed it is. I have a hand portable DMM that is now the main workshop
workhorse, and I am very easy with it. I also have a bench true RMS 6
digit
job that is used fairly rarely. The AVO still gets used where I feel it is
the appropriate instrument for the job. I tend to be happier using it
around
tube circuitry for measuring volts, and I prefer its ohms ranges for
measuring semiconductor junctions, even though the DMM has a diode test
facility
Arfa
It's what you are used to. I started out with an AVO 7 I think it
was 500 Ohms per Volt. It certainly had an effect on circuits even in
the days before CMOS.
I could turn on transistors and generally interact with circuits using
it. Although a tool no doubt aimed at Electrical Engineers it proved a
useful diagnostic instrument in an electronics environment.
Oddly enough the AVO eight was potentially more accurate than todays
digital afferings. At 20 K to the Volt, The AVO took half the current
of the modern DMM.
It was a dashed big needle to shift too.
My gripe with the AVO was that although it was a robust instrument,
you could buy around fifteen less robust meters for the same price.
Similar accuracy, smaller scale though and at a major price reduction.
Plus of course the fact that you could buy batteries to keep the Ohm
fires burning at your local newsagent. I seem to recollect tht The AVO
needed some kind of battery / inverter replacement when Ever Ready
stopped producing their very expensive box of volts.
Had that problem with my Taylor meter - I wound a blocking oscillator coil
on a small toroid and simply shunted the output with a 30V zener, its
connected via a pushbutton to the 1.5V low Ohms battery.