value of Lab-Volt power supply

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I have an ac/dc power supply with a DC and a VOM meter. It's fairly
large with 3 units stacked together. I couldn't find any model #. Any
idea as to it's value?
 
rjv494@verizon.net wrote:
I have an ac/dc power supply with a DC and a VOM meter. It's fairly
large with 3 units stacked together. I couldn't find any model #. Any
idea as to it's value?
Sorry, my magic globe is out of order.
Click to expand...
And my guessometer is shorted.
If you dont know what you have , ho could we know????
 
rjv494@verizon.net wrote:
http://img504.imageshack.us/img504/6294/0000003hx4.th.jpg
Sorry,that picture is (almost) unreadable(unfocused lowres).
Click to expand...
I would advice to check the meters/dials for their range,
and to verify your guesses with attaching some
heavy resistors to load the supply, and measure voltage
stability at a number of load currents.
That way, besides learning what these kind of supplies
can deliver, you learn a lot of useful stuff.
Watch out for fold back over current protection, some supplies
switch to constant current output when overloaded, others
decrease the maximum current to a low value when overloaded/
shorted, to keep the temperature of the supply within limits.
If you can get a better picture, some people might recognize
the make/brand.
 
rjv494@verizon.net wrote:
http://i360.photobucket.com/albums/oo48/ron08840/000_0003.jpg
Click to expand...
You might get a bid of $50 to $60 on eBay. The shipping is
going to be expensive, though, and that will discourage bidding.

--
Regards,

John Popelish
 
rjv494@verizon.net wrote:
http://i360.photobucket.com/albums/oo48/ron08840/000_0003.jpg
Click to expand...
The top part is a very nice signal generator, capable of supplying
up to 200 V voltage or current with a nice output voltage/current
range.

the lower part is an ac/dc voltage supply, unclear what frequency
the AC setting supplies.

It can apparently also act as a variable resistor, which can be quite
useful in a labratory.

The two analog meters give a nice display of the selected output range.

If I were you, I would connect a scope and volt/ohm/current meter,
to check out what happens at the output.

It looks like I would have liked to have this gadget in my lab,
but alas, I am retired.

If it works correctly, you have a very nice piece of equipment, with
extremely high output ranges in voltage and current.
 
Sjouke Burry wrote:
rjv494@verizon.net wrote:
http://i360.photobucket.com/albums/oo48/ron08840/000_0003.jpg

The top part is a very nice signal generator, capable of supplying
up to 200 V voltage or current with a nice output voltage/current
range.
Click to expand...
No. That section is an amp/volt meter that goes up to 200V /2A.

the lower part is an ac/dc voltage supply, unclear what frequency
the AC setting supplies.

It can apparently also act as a variable resistor, which can be quite
useful in a labratory.
Click to expand...
Are you sure you are not just seeing a volt ohm meter? That
is what I see.

The two analog meters give a nice display of the selected output range.

If I were you, I would connect a scope and volt/ohm/current meter,
to check out what happens at the output.

It looks like I would have liked to have this gadget in my lab,
but alas, I am retired.

If it works correctly, you have a very nice piece of equipment, with
extremely high output ranges in voltage and current.
Click to expand...
Look again.

--
Regards,

John Popelish
 
John Popelish wrote:

No. That section is an amp/volt meter that goes up to 200V /2A.
Click to expand...
The top part is marked as a signal generator

Are you sure you are not just seeing a volt ohm meter? That
is what I see.
Click to expand...
The bottom part is marked as AC/DC supply.

So I advise you to re-examen the last picture.
 
On Tue, 16 Sep 2008 15:44:42 -0700 (PDT), rjv494@verizon.net wrote:

http://img504.imageshack.us/img504/6294/0000003hx4.th.jpg
Click to expand...
A decent-sized picture rather than that thumbnail may help someone
make a guess. Any maker's names, model numbers, etc?

If it is home-brew, or unidentifiable, it probably isn't worth much.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
 
On Tue, 16 Sep 2008, rjv494@verizon.net wrote:

I have an ac/dc power supply with a DC and a VOM meter. It's fairly
large with 3 units stacked together. I couldn't find any model #. Any
idea as to it's value?

I've never seen much value in a variable power supply. Yes, they
Click to expand...
can look all fancy and there's certainly more to them than fixed voltage
supplies.

But for a lot of use, you never need more than a few fixed voltages.
+12, -12 and +5v. Indeed, you are more likely to need multiple
voltages at the same time than variable voltage.

For the time one needs actual variable voltage, they can throw together
something outboard with a 317 variable voltage regulator. If they like
it enough, they can add it to the fixed voltage power supply (assuming
there is room) and let it sit there for the next time it's needed.
Meters look impressive, but again one can get by with an external meter.

There is a definite need for a variable power supply for some uses,
just as some will need a power supply that can put out a lot of current.
But those often fall out of the every day. The average hobbyist is
better off with multiple low current supplies, because they
may need to power more than one thing at the same time but want
isolation, and toss some money down for a cheap second DMM that
can do the work of the fancy meter on the variable power supply.

Michael
 
On 16 sep, 21:42, "Phil Allison" <philalli...@tpg.com.au> wrote:
"Peter Bennett"
 rjv...@verizon.net



http://img504.imageshack.us/img504/6294/0000003hx4.th.jpg

A decent-sized picture rather than that thumbnail

**  Been posted long ago.

 Any maker's names,

** The name is in the heading  " Lab-Volt "

http://www.labvolt.com/

The OP's unit look like something they produced for electronics students 30+
years ago.

.....   Phil
Click to expand...

http://www.labvolt.com/products/electricity-and-electronics/instrumentation/laboratory-instrumentation-system-438

This device's design is indeed very old, but it's still being produced
and
sold. It is intended for students and novices, not for professionals
or serious hobbyists. I used to work at Lab-Volt and I've tested or
fixed a few of these...
If you could see how this thing is made inside it would feel like
making a
time travel some 25 years back..

There's a link for the datasheet on the page.

Patrick
 
On Sep 17, 10:24 am, rjv...@verizon.net wrote:
http://i360.photobucket.com/albums/oo48/ron08840/000_0003.jpg
Click to expand...
The VOM is essentially useless, no one wants a big thing like that
that taking up space on their bench.

The power supply isn't much chop, as it doesn't have adjustable
current limiting.

The sine/square gen is very rudimentary.

10kg+ means expensive shipping, so that mean on eBay it's probably
only worth the cost of shipping. i.e. the unit itself is almost
worthless.

Dave.
 
On Wed, 17 Sep 2008 06:09:45 -0700 (PDT), "David L. Jones"
<altzone@gmail.com> wrote:

On Sep 17, 10:24 am, rjv...@verizon.net wrote:
http://i360.photobucket.com/albums/oo48/ron08840/000_0003.jpg

The VOM is essentially useless, no one wants a big thing like that
that taking up space on their bench.

The power supply isn't much chop, as it doesn't have adjustable
current limiting.

The sine/square gen is very rudimentary.

10kg+ means expensive shipping, so that mean on eBay it's probably
only worth the cost of shipping. i.e. the unit itself is almost
worthless.
Click to expand...
If OP is in the Portland OR area, Powell's Technical Books may accept
it as a donation.
 
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