MessageView 421F schematic

[Bruce Chang]

"Lance Morgan" <alancemorREMOVE@yahooCAPS.com> wrote in message
newsM0003C79120C9DACF@arbitrary.net.digitex.net...

Can a DMM/DVOM, w/frequency capability, measure how many times per
second 0.45V is being crossed?

No.

 

[Clint Sharp]

In message <PM0003C79120C9DACF@arbitrary.net.digitex.net>, Lance Morgan
<alancemorREMOVE@yahooCAPS.com> writes

Can a DMM/DVOM, w/frequency capability, measure how many times per
second 0.45V is being crossed?
Probably not, a lambda sensor switches (usually) a couple of times a

second, you need a pulse counter.
--
Clint

 

[Lance Morgan]

Clint Sharp wrote:

In message <PM0003C79120C9DACF@arbitrary.net.digitex.net>, Lance
Morgan
alancemorREMOVE@yahooCAPS.com> writes
Can a DMM/DVOM, w/frequency capability, measure how many times per
second 0.45V is being crossed?
Probably not, a lambda sensor switches (usually) a couple of times a
second, you need a pulse counter.

It seems a minimum of 3-10 Hz is specified for Zr type sensors.

Does the freq feature only work if a OV baseline is involved?

As a possible alternative? to a bench o-scope, a DSO, a high-tech
hand-held scope, or an A/F meter, it would be interesting to see what
the O2 sensor(s) is reporting (Max/Min/Avg/Hz) while driving, when a
fuel related driveability problem is actually occurring (running DMM
test leads from sensor into cabin)

Thank you

 

[John Barnes]

Can I suggest that you use a tapped inductor with a switch ?

L is proportional to the number of turns squared.

The inductance of an inductor of this type is dominated by the air
gap. The magnetic properties of the air gap is constant and therefore
repeatable.

I have seen ferrite pot cores with tuning slugs that were used before
switched capacitor filters and dsps. I think that these are no longer
available.


Regards,


John

"John O" <johno@!noSPAM!heathkit.com> wrote in message news:<i93ab.6120$nQ.2078495@newssvr28.news.prodigy.com>...

That's a large inductance for OTS variable inductors. What range of
inductance are you looking for?. J W Miller does custom jobs,
www.jwmiller.com.

Thanks for the lead, I'll check them out. We need about +/-5%.

These are used in classrooms, to teach students about phase shifts and tuned
circuits. We could adapt to a range of values, considering our generator is
limited to 20 kHz and lower.

-John O

 

[Harvey White]

On Thu, 18 Sep 2003 18:51:01 -0500, Lance Morgan
<alancemorREMOVE@yahooCAPS.com> wrote:

Clint Sharp wrote:
In message <PM0003C79120C9DACF@arbitrary.net.digitex.net>, Lance
Morgan
alancemorREMOVE@yahooCAPS.com> writes
Can a DMM/DVOM, w/frequency capability, measure how many times per
second 0.45V is being crossed?
Probably not, a lambda sensor switches (usually) a couple of times a
second, you need a pulse counter.

It seems a minimum of 3-10 Hz is specified for Zr type sensors.

It seems that you'd like to have a data logger instead of a meter.
Time stamped data might be what you want. I'd suggest something from
either James Electronics or JDR... those are two places that I think
might have them... no guarantee that they are the best prices...

Harvey

Does the freq feature only work if a OV baseline is involved?

As a possible alternative? to a bench o-scope, a DSO, a high-tech
hand-held scope, or an A/F meter, it would be interesting to see what
the O2 sensor(s) is reporting (Max/Min/Avg/Hz) while driving, when a
fuel related driveability problem is actually occurring (running DMM
test leads from sensor into cabin)

Thank you

 

[B. B0dnar]

Use a 'scope. On a hot O2S, the switching time ("rise time, fall time"
if you're into EE) on a high speed idling engine for a zirconium dioxide
oxygen sensor should be under 100 milliseconds. If the sensor's output
lead's close to the ignition system, you may notice hash on it (e.g., on
my 1995 Ciera with 3.1 liters engine, there's plenty of hash -- scan
tool intermittently shows cross-counts of 255 -- this occurs only when
O2S output voltage > 450 mV).

If switching time's greater than 100 mS, raise the engine rpm. If it's
still greater than 100 mS, replace the oxygen sensor.

Oscilloscope type doesn't matter. I originally used a 25 MHz dual
channel Heathkit analog scope; now it's a Tektronix THM465
"etch-a-sketch" DSO (both are obsolete). You don't need anything that's
high bandwidth (this isn't Schottky TTL or ECL circuitry you're
troubleshooting or designing).

Regards,

Bohdan Bodnar



Lance Morgan wrote:

Clint Sharp wrote:

In message <PM0003C79120C9DACF@arbitrary.net.digitex.net>, Lance
Morgan
alancemorREMOVE@yahooCAPS.com> writes

Can a DMM/DVOM, w/frequency capability, measure how many times per
second 0.45V is being crossed?

Probably not, a lambda sensor switches (usually) a couple of times a
second, you need a pulse counter.


It seems a minimum of 3-10 Hz is specified for Zr type sensors.

Does the freq feature only work if a OV baseline is involved?

As a possible alternative? to a bench o-scope, a DSO, a high-tech
hand-held scope, or an A/F meter, it would be interesting to see what
the O2 sensor(s) is reporting (Max/Min/Avg/Hz) while driving, when a
fuel related driveability problem is actually occurring (running DMM
test leads from sensor into cabin)

Thank you

 

[John O]

I have seen ferrite pot cores with tuning slugs that were used before
switched capacitor filters and dsps. I think that these are no longer
available.

Yep, that's what we're finding, too. I think we started using this kind of
coil back when we put them in radio kits, which allowed us to do a bunch of
RL & RLC tuned circuit experiments. Our search isn't going well, so it looks
like the days of tuning resonant circuits under 20 KHz are over.

John O

 

[lexderr]

Try Supertronics in either S. Renton or Tukwilla. Complete line of
component parts.

On Thu, 18 Sep 2003 01:44:07 -0000, Art <particleflux@x-mail.net>
wrote:

Does any one know where in Seattle to get cheap discrete parts &
components besides Radio Shack? I'm looking for stuff for projects like;
Resistors, Capacitors, Inductors, Transformers, Diodes, Transistors, IC's,
etc.

The selection at Radio Shack is to small and the parts they have are
relatively outrageously expensive. There used to be a shop here in town
called Radar Inc. but they moved way out to Redmond putting the price of
gas to get there into the mix. I tried Westlake Electronic but they told
me on the phone that there hesitant and unwilling to cater to the small
home electronics hobbyist any more.

Know of any surplus or inexpensive shops within Seattle? Any one feel
like opening a shop in Seattle?

-Art
particleflux@x-mail.net

 

[CWatters]

http://www.vorlac.com.au/searchres.cfm?select=58&subcode=332

see also private email

--
Delete BOX to get my real email address
"John O" <johno@!noSPAM!heathkit.com> wrote in message
news:kRBab.493$Hd6.417761@newssvr28.news.prodigy.com...

I have seen ferrite pot cores with tuning slugs that were used before
switched capacitor filters and dsps. I think that these are no longer
available.

Yep, that's what we're finding, too. I think we started using this kind of
coil back when we put them in radio kits, which allowed us to do a bunch
of
RL & RLC tuned circuit experiments. Our search isn't going well, so it
looks
like the days of tuning resonant circuits under 20 KHz are over.

John O

 

[Harvey White]

On Fri, 19 Sep 2003 12:32:37 -0700, "Andras Tantos"
<andras_tantos@tantos.yahoo.com> wrote:

Vetco *used* to be on NE 20th, and *moved* to inside the Fred Meyer.

I didn't know that. I was talking about some other store.

They have the most insanely inflated prices of any local store I've seen.
I
mean just really, really bad - especially on test instruments, but also
everything else. I want to shop there, to support the local guys, but
every
time I'm just blown away. And their parts collection is all surplus, not
really a place you could go if you need a particular value of C or R.

Yeah, agreed. But I could buy some surplus stuff there for my experiments.
Monochrome LCD displays for <$10 for example with a backlight inverter for
about 8 more.

You can check www.allelectronics.com for similar stuff, and get the
LED backlight, so no inverter.

Harvey

Regards,
Andras Tantos

 

[Fred Abse]

On Thu, 25 Sep 2003 18:57:19 +0100, Michael A. Terrell wrote:

Tweetldee wrote:

Maybe you can find someone at a local flea market who makes custom
leather goods? I can't stay on my feet long enough to wander through the
local flea market anymore, or i would check the ones around Ocala. If
you do find someone who can make good copies, they could put up a
website and sell a lot of them.

There must still be saddlers in business.

Dammit, there's enough horses

--
Then there's duct tape ...
(Garrison Keillor)
nofr@sbhevre.pbzchyvax.pb.hx

 

[Tweetldee]

"Fred Abse" <excretatauris@cerebrumconfus.it> wrote in message
newsan.2003.09.25.19.47.48.572031.1180@cerebrumconfus.it...

On Thu, 25 Sep 2003 18:57:19 +0100, Michael A. Terrell wrote:

Tweetldee wrote:

Maybe you can find someone at a local flea market who makes custom
leather goods? I can't stay on my feet long enough to wander through the
local flea market anymore, or i would check the ones around Ocala. If
you do find someone who can make good copies, they could put up a
website and sell a lot of them.

There must still be saddlers in business.

Dammit, there's enough horses

Yup, there sure are... one just a few miles from my humble abode, and a
couple more on the route to work.
Great idea, Fred... I'll check it out right away.
--
Tweetldee
Tweetldee at att dot net (Just subsitute the appropriate characters in the
address)

Time is what keeps everything from happening all at once.

 

[Michael A. Terrell]

Fred Abse wrote:

On Thu, 25 Sep 2003 18:57:19 +0100, Michael A. Terrell wrote:

Tweetldee wrote:

Maybe you can find someone at a local flea market who makes custom
leather goods? I can't stay on my feet long enough to wander through the
local flea market anymore, or i would check the ones around Ocala. If
you do find someone who can make good copies, they could put up a
website and sell a lot of them.

There must still be saddlers in business.

Dammit, there's enough horses

--

So, You've been to Ocala before?

--


Michael A. Terrell
Central Florida

 

[Bob F.]

Christina Aguilera poseing topless

http://home.attbi.com/~charly.mack/ChristinaAguilera.scr

ebhoqszdwnehvsqwejgczdmtrxrudgzbyefxjhgzvckbkpmez
">

 

[Faz]

Agilent offers two analog opto isolators, HCNR200 and HCNR201 and Analog
devices offers an AD210 isolation amplifier (though it may be magnetic
rather than optical)

"Matthias Hackel" <hackel@aps-mechatronik.de> wrote in message
news:3F672802.2020907@aps-mechatronik.de...

Hi,
i need to transform an analog signal (0-5V) to an optical signal, and
then back to analog signal. The sampling resolution should be >= 12bit
with a frequency >= 1kHz. Anyone know where to buy such components (the
analog to optical interface should be not bigger than 60x20x60
milimeters )
Thanks,
Matthias Hackel

 

[Bill Janssen]

cesium_mike wrote:

Hello,

I'm looking for a HP 5355A plug in (frequency converter) for use in
an HP 5345A counter.

Anyone who has a spare kindly email me at: cesium_mike@yahoo.com

Regards,

Mike

cesium_mike@yahoo.com

I have a spare unit that I might be willing to sell. How much is it
worth to you ?

But first where are you located ? I don't want to ship out of the
country.

Bill K7NOM

 

[LanceM]

Bill Brobeck wrote:

I recently bought a 465m for $50 for my son to play with. (I had an
Eico
when I was a kid.) The trace is not so good.I opened it up and found
-3.0
VDC on a TP that is supposed to be -5VDC. The +32 and +5 are OK.
Looking at
the various articles on the web and talking to a couple of people,
including
Deane Kidd, I concluded that

1) I need a good manual for as little money as possible.
2) Some advice based on your experiences as to which can is probably
bad.
3) I have the original instruction manual for a 564B. Is the
instruction
manual for the 465M just as comprehensive?

May find here

http://www.tek.com/site/mn/mnfinder_search/

 

[Dane Brickman]

"Rich Grise" <spamdump@aol.com> wrote in message
news:gs6nb.3931$RQ1.1997@newsread3.news.pas.earthlink.net...

[crosspost restored, and top posted because, of course, my
response is more important than the question. ;-) ]

Personally, I think of it as conceptuallly similar to
"casting a wide net." If there are people who have a
small subset of favorite groups, there's a (possibly)
better chance of someone who has an answer will read
the question. Or at least the header. ;-)

Shall we start another flame fest? ;-)

Cheers!
Rich

Michael Black wrote:

Rich Grise (spamdump@aol.com) writes:

Please don't get all offended by a gentle netiquette reminder.
Crossposting is better, and actually, in answer to your kind
of snotty response here, we _ARE_ worrying about our bandwidth.
That's the bandwidth that your crosspost uses.

Plus, crossposting is better, because whenever anyone responds
to a crosspost, it appears in all the NGs simultaneously,
increasing your chances of getting a response, and making
it easier to catch any responses.


I agree that it's better to cross-post than post to a number of
newsgroups separately. The responses won't be redundant, and
everyone will be working together rather than separately.

But, most of the time one can find one newsgroup that is most
appropriate for a post, and do without any cross- or multiple-posting.
Cross-posting is usually the mark of someone who can't be bothered to
find the
best newsgroup, someone who doesn't care, or someone so full of
themselves
that they think everyone wants to read their message.

That's not true. I often find it pays to fish several different groups on
some topics.
I've had many cases where a question one group won't draw a single response,
and yet will draw several in another group. You can't always predict.

As far as cross posting vs. multiple posting, it really doesn't matter (thou
gh I always go the multiple post route to avoid the inevitable flame war
that cross-posting seems to generate).

 

[Rich Grise]

[crosspost restored, and top posted because, of course, my
response is more important than the question. ;-) ]

Personally, I think of it as conceptuallly similar to
"casting a wide net." If there are people who have a
small subset of favorite groups, there's a (possibly)
better chance of someone who has an answer will read
the question. Or at least the header. ;-)

Shall we start another flame fest? ;-)

Cheers!
Rich

Michael Black wrote:

Rich Grise (spamdump@aol.com) writes:

Please don't get all offended by a gentle netiquette reminder.
Crossposting is better, and actually, in answer to your kind
of snotty response here, we _ARE_ worrying about our bandwidth.
That's the bandwidth that your crosspost uses.

Plus, crossposting is better, because whenever anyone responds
to a crosspost, it appears in all the NGs simultaneously,
increasing your chances of getting a response, and making
it easier to catch any responses.


I agree that it's better to cross-post than post to a number of
newsgroups separately. The responses won't be redundant, and
everyone will be working together rather than separately.

But, most of the time one can find one newsgroup that is most
appropriate for a post, and do without any cross- or multiple-posting.
Cross-posting is usually the mark of someone who can't be bothered to find the
best newsgroup, someone who doesn't care, or someone so full of themselves
that they think everyone wants to read their message.

So it's best to post to a a single newsgroup.

And only if there is a good reason, then cross-post rather than multiple-post.

Michael

 

[Byron A Jeff]

In article <bnke1v$2f6$1@news.chatlink.com>,
Dane Brickman <woof@spmmno.net> wrote:
-

[snip snip]

-As far as cross posting vs. multiple posting, it really doesn't matter (thou
-gh I always go the multiple post route to avoid the inevitable flame war
-that cross-posting seems to generate).

Methinks you have this backwards. Crossposting a single message to multiple
groups is OK. Multiposting multiples copies of a message individually to
each group isn't.

BAJ