MessageView 421F schematic

Does anyone have a schematic or know where I can get one for an AB
MessageView 421F Thanks for any help, Ken
 
Does anyone have a schematic or know where I can get one for an AB
MessageView 421F Thanks for any help, Ken
 
and7@bigfoot.com (TekMan) wrote in
news:6a624601.0410010203.25374010@posting.google.com:

shure it only 5 KHz?



hth,
Andreas
Click to expand...
The signal itself is from an ultrasound hyrophone, with interesting signal
info in the 0-20MHz range, which is why I'm sampling at 250MS/sec. The
ultrasound pulse (and trigger) come at 5kHz rate.

-Greg
 
Greg Bredthauer <grb4remove@meduke.edu> wrote in
news:Xns9574C56A1E249HDTVAF@152.3.101.165:

Hi all,

I'm using a Tektronix 3034 scope to acquire a 10000 point waveform.
I'm sampling at 250MS/sec. The waveform repeats at 5kHz.

This is all fine and good... what confuses me is the behavior of the
averaging function. If I set the scope to average 16 waveforms to cut
down on random noise, it takes 3-4 seconds for the displayed waveform
to settle down to its final values when I change the input signal.
Why is this?
Click to expand...
I've solved my own problem... two things:

1. The scope captures and processes waveforms much more slowly at 250MS/s
than at 100MS/s for an unknown reason.

2. There is some kind of persistence beyond just averaging (some kind of
decaying averaging?) In any case, I can get around it by stopping and
restarting acquisition.

Making these 2 changes lets me get 128 averages done in under 1 second. I
hope this helps someone else out there :)

-Greg
 
"AliasFan" <AliasFan@underground.com> wrote in message
news:cjk1ic$vuq$1@gargoyle.oit.duke.edu...
and7@bigfoot.com (TekMan) wrote in
news:6a624601.0410010203.25374010@posting.google.com:

shure it only 5 KHz?



hth,
Andreas


The signal itself is from an ultrasound hyrophone, with interesting signal
info in the 0-20MHz range, which is why I'm sampling at 250MS/sec. The
ultrasound pulse (and trigger) come at 5kHz rate.

-Greg
Click to expand...

20 MHz seems incredibly high for mechanical transfer of energy in water.
What are you doing, and do you really need this bandwidth? Could you need be
related to viewing high-order artifacts of the transducer rather than an
actual propagated signal?

Ed
wb6wsn
 
In sci.electronics.design AA Institute <abdul.ahad@ntlworld.com> wrote:
Hi,
Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors? Even worse,
it will get splashed by the waters in my miniature "lake" projects as
depicted here:-
Click to expand...
Yes.
Torque, RPM, budget?
 
AA Institute wrote:
Hi,
Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors? Even worse,
it will get splashed by the waters in my miniature "lake" projects as
depicted here:-

http://uk.geocities.com/aa_spaceagent/LakeEuropa.html#Hydrobot

(That's a large *pond* in an isolated location... hence I gave it a
pet name of "Lake Europa"!)

Thanks
AAI
Click to expand...
Try aquarium supply companies.
 
On 3 Oct 2004 02:10:01 -0700, abdul.ahad@ntlworld.com (AA Institute)
wrote:

Hi,
Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors? Even worse,
it will get splashed by the waters in my miniature "lake" projects as
depicted here:-

http://uk.geocities.com/aa_spaceagent/LakeEuropa.html#Hydrobot

(That's a large *pond* in an isolated location... hence I gave it a
pet name of "Lake Europa"!)

Thanks
AAI
Click to expand...
Any garden centre will do this.

d
Pearce Consulting
http://www.pearce.uk.com
 
Hi,

Why does it have to be a DC motor? The pump motors you can get at garden
centers would be AC.

Regards, Joerg

http://www.analogconsultants.com
 
AA Institute wrote:

Hi,
Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors? Even worse,
it will get splashed by the waters in my miniature "lake" projects as
depicted here:-

http://uk.geocities.com/aa_spaceagent/LakeEuropa.html#Hydrobot

(That's a large pond in an isolated location... hence I gave it a
pet name of "Lake Europa"!)

Thanks
AAI
Click to expand...
google for fish tank 12v water pump
found this: http://www.altenergystore.com/cart/pumps.html
 
On Sunday 03 October 2004 02:10 am, AA Institute did deign to grace us with
the following:

Hi,
Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors? Even worse,
it will get splashed by the waters in my miniature "lake" projects as
depicted here:-

http://uk.geocities.com/aa_spaceagent/LakeEuropa.html#Hydrobot

(That's a large *pond* in an isolated location... hence I gave it a
pet name of "Lake Europa"!)
Click to expand...
http://www.google.com/search?q=%2Bpond+%2Bpump&btnG=Search

You're welcome. :)
Rich
 
DC motor with magnet on shaft sealed inside a plastic container, outside of
the container have another magnet fixed to an impellor.

Motor turns....... impellor follows.

Just an idea!.

Gordon.

---------------------------------------------------------------




"AA Institute" <abdul.ahad@ntlworld.com> wrote in message
news:adbf5bc1.0410030110.30e804ff@posting.google.com...
Hi,
Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors? Even worse,
it will get splashed by the waters in my miniature "lake" projects as
depicted here:-

http://uk.geocities.com/aa_spaceagent/LakeEuropa.html#Hydrobot

(That's a large *pond* in an isolated location... hence I gave it a
pet name of "Lake Europa"!)

Thanks
AAI
Click to expand...
 
I read in sci.electronics.design that Genome <genome@nothere.net> wrote
(in <CNZ7d.639$ST4.564@newsfe6-gui.ntli.net>) about 'Water resistant
motor', on Sun, 3 Oct 2004:

Buy ones with plastic lids...... silly!
Click to expand...
Actually, glass is a better enclosure material than peanut butter.
Greater useful temperature range.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
 
Gary Schafer wrote:

Can anyone tell me what type and voltage the battery is in the Fluke
731B reference standard?

Also have a Fluke 750A reference divider that used 7.5 volt mercury
cells. What would be a good substitute for them?

Anyone have a copy of the manual for either?

Thanks
Gary K4FMX
Click to expand...
I would think that either the silver oxide cell (about 1.45V if i
remember correctly) or the lithium cell (most are 3.0V but Tadrian has
higher voltage cells) would be useful as local standards.
 
Joerg wrote:

Hi,

Why does it have to be a DC motor? The pump motors you can get at garden
centers would be AC.

Regards, Joerg

http://www.analogconsultants.com
Click to expand...
Perhaps some of them might be DC, but AC vs DC is a good question; it
is the size and functionality that seems to be paramount..
 
Gordon Youd wrote:

DC motor with magnet on shaft sealed inside a plastic container, outside of
the container have another magnet fixed to an impellor.

Motor turns....... impellor follows.

Just an idea!.

Gordon.

---------------------------------------------------------------




"AA Institute" <abdul.ahad@ntlworld.com> wrote in message
news:adbf5bc1.0410030110.30e804ff@posting.google.com...

Hi,
Can someone please tell me if there's a small, *water proof* DC motor
available to buy which I can leave permanently outdoors? Even worse,
it will get splashed by the waters in my miniature "lake" projects as
depicted here:-

http://uk.geocities.com/aa_spaceagent/LakeEuropa.html#Hydrobot

(That's a large *pond* in an isolated location... hence I gave it a
pet name of "Lake Europa"!)

Thanks
AAI
Click to expand...
There are a few motors actually designed this way...
 
On Sunday 03 October 2004 08:23 pm, Don Kelly did deign to grace us with the
following:

"John Woodgate" <jmw@jmwa.demon.contraspam.yuk> wrote in message
news:VHjgH3N5OGYBFwdi@jmwa.demon.co.uk...
I read in sci.electronics.design that Frank Bemelman <f.bemelmanx@xs4all
Or peanut butter jars. IP67 and cheaper ;)

The lids go rusty.
----------
You haven't bought peanut butter for a while- nowadays both jar and lid
are plastic.-at least the one marked "kraft" in my pantry is made this way
:) --
Click to expand...
I think they haven't discovered plastic yet over there.
 
"AA Institute" <abdul.ahad@ntlworld.com> wrote in message
news:adbf5bc1.0410031012.181b6b1b@posting.google.com...

I just want it to keep the water surface stirring enough to stop the
pond from freezing over completely, and endangering the fish.
Click to expand...
A small air pump - like used for aquaries??

The pump is left in a dry place and the hose can be as long as you like
because there will be little pressure drop with the miniscule flow.
 
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