On Fri, Aug 2, 2019 at 08:19 PM, Tam Hanna wrote:

If I do remember correctly, this was the main reason for FFT Spectrum Analyzers. At least, I can remember that my insane friend who repairs cars had one for that purpose.

I'm thinking used for standardization in general with or without a lock-in amplifier or mixer.

There is an intelligence related discipline that isn't well disclosed either, called Radiation Intelligence (RINT) and the more known Electronics Intelligence (ELINT).

? (yeah, really well disclosed not)

I assume there are roles in detecting human body electrophysiological signals also that aren't well disclosed either.?

The signals can be used to determine rigidity and other characteristics of a vehicles/craft frame or part also via vibration analysis.

I recall reading somewhere as noted by Tam, that F1 and other racers use also to determine variables related to opponents vehicles performance... ah, yes... here is the question I wrote not to long ago regarding RPM... though not finding the article regarding the racers (was thinking was the Hackaday article relating though maybe the comment was deleted as mine are when to revealing controversial/proprietary info):???

The HP 3325 is the favorite also when I asked this question:??

On 8/2/19 6:28 PM, saipan59 wrote:

I thought most "digital" clocks used the AC line frequency for the
counter time base and switched to a xtal or resonator on battery
operation during a power outage. Interesting that your 2 clocks
don't stay in sync.
Trevor

Just a guess, but my guess is that a crystal-only implementation is
cheaper these days than tying into the 60 Hz line for the time base.
Plus, it works in countries that have 50 Hz power, which might be the
REAL answer.

I worked on a commercial project a couple of years ago (not a clock)
in which I had to make this decision. The crystal was a good bit
cheaper than the components to do reliable zero-crossing detection.

-Dave

Join the FMT-Nuts so you can look "Mother Nature" in the eye and see that she has a sense of humor when it comes to predicting propagation.

Burt, K6OQK :>

On August 2, 2019 9:38:22 AM PDT, DW <wilson2115@...> wrote:

I am sure there are special cases where you need precision like this,
this is like some of the spectrum analyzers I seen that can go down to
10 Hz frequency though I am not sure who would want to measure a 10 Hz
signal with spectrum analyzer. It is probably there just because it is
capable of doing that.

I would say it would be interesting every once and a while to play with
micro hertz resolution, especially if you are able to somehow detect it
with that precision. I certainly don't have anything that can detect
micro hertz.

--
Sent from my Android thingamabob with K-9 Mail. Please pardon the spelling errors as the dog can't spell so good.

Just to add perhaps a little drama, any list member who believes that a post violates the list charter should “contact list owner” using the link at the bottom of every message, rather than play topic cop and call out another list member.?

On Aug 2, 2019, at 22:09, Tam Hanna <tamhan@...> wrote:

Hello,
While I don't want to add to the drama, this is RF guys being RF guys at their finest. I just got up at 4am, and now have a reason to open a drink.

Seriously though, I did not find Petes offers annoying. Quite the contrary, I always read them as "what is on the market, and what does it cost" - much like the LIDL newspaper.


73 de OE1HAT...finally got me callsign!

---

With best regards
Tam HANNA (emailing on a BlackBerry PRIV)

Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at

Am 3. August 2019 02:53:38 MESZ schrieb Chuck Harris <cfharris@...>:

Sales have always been permitted on this list.  What isn't
is great spammy sales listings that come, and come, and come.

If you are a contributing member, I am sure that there is no
problem with listing a few items from your stash from time to
time.

If you find yourself regularly doing something that is vastly
different than what everyone else does, then it might be time
to rethink your actions.

I haven't seen anything that you have been doing that is in
my opinion, objectionable.

-Chuck Harris (not a moderator)

Pete Manfre wrote:
 Got it…

 An FYI… Reg was banned from the TET list for flaming.   And is mad at me
 for refusing to sell to him.   A simple apology could have cured all,  but
 not be in his nature.

 Sorry for the BW.  Will use other lists for the posts even for the free
 stuff I am purging.

 Pete wa2odo




 On Fri, Aug 2, 2019, 6:44 PM Reginald Beardsley via Groups.Io <pulaskite=
 [email protected]> wrote:

 This list is for HPAK repair support.   It is not a "for sale" list.
 There is another list on which these are appropriate
 Test-Equipment-For-Sale-Wanted-or-Exchange.

 Please use that list.  On this list it is spam, pure and simple.

 Reg





 


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Hello,
Sorry to be the party pooper. Forget all audiophile crap in that regard - while one can definitely fleece a gold digger or a pickup artist with some "service related to your stereo's bass response" , the real reason - for a long time - has been turbines. Think impeller, Kaplan Diener turbine and so on.

While it might sound counter intuitive, these units fart out a not always audible "sound" which one can pick up with specialized transducers. This can then be used to determine various things - from RPM to, with a metalurgist, even information about the health of ball bearings, axles and the various other mechanical trinkets.

If I do remember correctly, this was the main reason for FFT Spectrum Analyzers. At least, I can remember that my insane friend who repairs cars had one for that purpose.

---

With best regards
Tam HANNA (emailing on a BlackBerry PRIV)

Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at

Am 2. August 2019 18:38:22 MESZ schrieb DW <wilson2115@...>:

I am sure there are special cases where you need precision like this, this is like some of the spectrum analyzers I seen that can go down to 10 Hz frequency though I am not sure who would want to measure a 10 Hz signal with spectrum analyzer. It is probably there just because it is capable of doing that.

I would say it would be interesting every once and a while to play with micro hertz resolution, especially if you are able to somehow detect it with that precision. I certainly don't have anything that can detect micro hertz.

While I wasn't able to get the 2-01C or either of the EA53s to act like a detector/rectifier in my experimental setups, (easy enough to do with an ordinary silicon diode, but not so much with these tubes). I was, however, able to substitute a silicon diode and get the probe to at least give me some readings (although, naturally, not correct) which indicated to me that the probe body and cable are working.
The more I look at this, the more I'm convinced that someone substituted a 2-01C in a probe that was designed for an EA53. I put the EA53 from my other, working probe into the probe that had the 2-01C in it and that worked. I think the size differences in the 2-01C are not so far out that the EA53-designed probe will still accommodate it (not perfectly, but it can be made to go in the socket).
The problem now is that the spring tip on the 2-01C is slightly larger than then anode tip on the EA53 and it fits too loosely. I'm not sure if that's because a tip that was supposed to go on the EA53 was forced on the 2-01C or whether the 2-01C had a slightly different spring tip. Given everything else, I'm thinking that it, too, was forced into service on the 2-01C and, thus, is now stretched out a bit. I think I can retwist that spring for a better fit onto the EA53 but would be interested in knowing whether two different spring tips existed and, if so, if someone knows where a spring tip for an EA53 can be had.
Thanks for the listen,
Barry - N4BUQ

Just to add perhaps a little drama, any list member who believes that a post violates the list charter should “contact list owner” using the link at the bottom of every message, rather than play topic cop and call out another list member.?

On Aug 2, 2019, at 22:09, Tam Hanna <tamhan@...> wrote:

Hello,
While I don't want to add to the drama, this is RF guys being RF guys at their finest. I just got up at 4am, and now have a reason to open a drink.

Seriously though, I did not find Petes offers annoying. Quite the contrary, I always read them as "what is on the market, and what does it cost" - much like the LIDL newspaper.


73 de OE1HAT...finally got me callsign!

---

With best regards
Tam HANNA (emailing on a BlackBerry PRIV)

Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at

Am 3. August 2019 02:53:38 MESZ schrieb Chuck Harris <cfharris@...>:

Sales have always been permitted on this list.  What isn't
is great spammy sales listings that come, and come, and come.

If you are a contributing member, I am sure that there is no
problem with listing a few items from your stash from time to
time.

If you find yourself regularly doing something that is vastly
different than what everyone else does, then it might be time
to rethink your actions.

I haven't seen anything that you have been doing that is in
my opinion, objectionable.

-Chuck Harris (not a moderator)

Pete Manfre wrote:
 Got it…

 An FYI… Reg was banned from the TET list for flaming.   And is mad at me
 for refusing to sell to him.   A simple apology could have cured all,  but
 not be in his nature.

 Sorry for the BW.  Will use other lists for the posts even for the free
 stuff I am purging.

 Pete wa2odo




 On Fri, Aug 2, 2019, 6:44 PM Reginald Beardsley via Groups.Io <pulaskite=
 [email protected]> wrote:

 This list is for HPAK repair support.   It is not a "for sale" list.
 There is another list on which these are appropriate
 Test-Equipment-For-Sale-Wanted-or-Exchange.

 Please use that list.  On this list it is spam, pure and simple.

 Reg





 


 Links: You receive all messages sent to this group.

View/Reply Online (#98144): /g/HP-Agilent-Keysight-equipment/message/98144
Mute This Topic: /mt/32685361/102401
Group Owner: [email protected]
Unsubscribe: /g/HP-Agilent-Keysight-equipment/leave/defanged  [tamhan@...]

I am sure there are special cases where you need precision like this, this is like some of the spectrum analyzers I seen that can go down to 10 Hz frequency though I am not sure who would want to measure a 10 Hz signal with spectrum analyzer. It is probably there just because it is capable of doing that.

I would say it would be interesting every once and a while to play with micro hertz resolution, especially if you are able to somehow detect it with that precision. I certainly don't have anything that can detect micro hertz.

Hello,
While I don't want to add to the drama, this is RF guys being RF guys at their finest. I just got up at 4am, and now have a reason to open a drink.

Seriously though, I did not find Petes offers annoying. Quite the contrary, I always read them as "what is on the market, and what does it cost" - much like the LIDL newspaper.


73 de OE1HAT...finally got me callsign!

---

With best regards
Tam HANNA (emailing on a BlackBerry PRIV)

Enjoy electronics? Join 14k other followers by visiting the Crazy Electronics Lab at

Am 3. August 2019 02:53:38 MESZ schrieb Chuck Harris <cfharris@...>:

Sales have always been permitted on this list.  What isn't
is great spammy sales listings that come, and come, and come.

If you are a contributing member, I am sure that there is no
problem with listing a few items from your stash from time to
time.

If you find yourself regularly doing something that is vastly
different than what everyone else does, then it might be time
to rethink your actions.

I haven't seen anything that you have been doing that is in
my opinion, objectionable.

-Chuck Harris (not a moderator)

Pete Manfre wrote:
 Got it…

 An FYI… Reg was banned from the TET list for flaming.   And is mad at me
 for refusing to sell to him.   A simple apology could have cured all,  but
 not be in his nature.

 Sorry for the BW.  Will use other lists for the posts even for the free
 stuff I am purging.

 Pete wa2odo




 On Fri, Aug 2, 2019, 6:44 PM Reginald Beardsley via Groups.Io <pulaskite=
 [email protected]> wrote:

 This list is for HPAK repair support.   It is not a "for sale" list.
 There is another list on which these are appropriate
 Test-Equipment-For-Sale-Wanted-or-Exchange.

 Please use that list.  On this list it is spam, pure and simple.

 Reg





 


 Links: You receive all messages sent to this group.

View/Reply Online (#98144): /g/HP-Agilent-Keysight-equipment/message/98144
Mute This Topic: /mt/32685361/102401
Group Owner: [email protected]
Unsubscribe: /g/HP-Agilent-Keysight-equipment/leave/defanged  [tamhan@...]

Sales have always been permitted on this list.  What isn't
is great spammy sales listings that come, and come, and come.

If you are a contributing member, I am sure that there is no
problem with listing a few items from your stash from time to
time.

If you find yourself regularly doing something that is vastly
different than what everyone else does, then it might be time
to rethink your actions.

I haven't seen anything that you have been doing that is in
my opinion, objectionable.

-Chuck Harris (not a moderator)

Pete Manfre wrote:
 Got it…

 An FYI… Reg was banned from the TET list for flaming.   And is mad at me
 for refusing to sell to him.   A simple apology could have cured all,  but
 not be in his nature.

 Sorry for the BW.  Will use other lists for the posts even for the free
 stuff I am purging.

 Pete wa2odo




 On Fri, Aug 2, 2019, 6:44 PM Reginald Beardsley via Groups.Io <pulaskite=
 [email protected]> wrote:

 This list is for HPAK repair support.   It is not a "for sale" list.
 There is another list on which these are appropriate
 Test-Equipment-For-Sale-Wanted-or-Exchange.

 Please use that list.  On this list it is spam, pure and simple.

 Reg





 


Groups.io Links: You receive all messages sent to this group.

View/Reply Online (#98144): /g/HP-Agilent-Keysight-equipment/message/98144
Mute This Topic: /mt/32685361/102401
Group Owner: [email protected]
Unsubscribe: /g/HP-Agilent-Keysight-equipment/leave/defanged  [tamhan@...]

From: "Barry" <n4buq@...>
To: [email protected]
Sent: Saturday, July 27, 2019 3:00:50 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Testing a 2-01C Diode

That's the way I thought of it. It's just a diode and should act like one if
it's good. What gets me is the relatively tiny forward DC current rating.
For tube construction, that just seems odd - especially considering it's
rated at 1000V.

Thanks,
Barry - N4BUQ

----- Original Message -----

From: "Chuck Harris" <cfharris@...>
To: [email protected]
Sent: Saturday, July 27, 2019 12:37:55 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Testing a 2-01C Diode

Well, it is just a diode.

Take a 9V battery, a resistor as a load, and your DVM,
and try the battery this way, and then that way, and if the
current isn't there in one direction, but is in the other
direction, it is probably good.

The specs are available on the web, so you should be able to
pick your load resistor to match the typical current as specified
in the data sheet.

Or, you could put it on a curve tracer...

-Chuck

n4buq wrote:

Still working on the recently-acquired 11036A which isn't working. I've
checked the probe wiring and don't see anything amiss. When it powers
up,
the tube gets hot so the heater is evidently working; however, I get no
signals back to the meter.

Since I have another probe (this one uses the EA53), I tried that with
the
meter and it works fine so the problem has to be somewhere in the probe
and I'm beginning to wonder if it isn't the tube but am curious as to how
that might be considering the heater works (which, I presume, is the
primary failure point with these).

Before I go spending money on a rather expensive tube, is there simple
way
I can test this one out of the probe? If I supply heater voltage (via an
auxiliary power supply), can I place the diode across the signal source
and expect to see half-wave rectification? If I do this, should
precautions be made to limit the current through the tube and, if so, how
much current is safe? Unless I'm misreading/misunderstanding the specs,
the tube is only rated at 1mA DC which seems quite small but, again, I
might be misunderstanding that rating.

BTW, I'm supplying the AC signal with an HP 3310B function generator.

Thanks,
Barry - N4BUQ

Got it…

An FYI… Reg was banned from the TET list for flaming. And is mad at me
for refusing to sell to him. A simple apology could have cured all, but
not be in his nature.

Sorry for the BW. Will use other lists for the posts even for the free
stuff I am purging.

Pete wa2odo




On Fri, Aug 2, 2019, 6:44 PM Reginald Beardsley via Groups.Io <pulaskite=
[email protected]> wrote:

This list is for HPAK repair support. It is not a "for sale" list.
There is another list on which these are appropriate
Test-Equipment-For-Sale-Wanted-or-Exchange.

Please use that list. On this list it is spam, pure and simple.

Reg