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  1. HP-Agilent-Keysight-Equipment
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HP 8640 REPAIR

Don Humphrey
 

¿ªÔÆÌåÓý

I am trying to repair a USM-323 Sig Generator.

The RF output module is bad.?

The number is 08640-67005.

If you look on EBAY There are all kinds

of numbers xxxx-67007,002. I have not

seen any -67005 however.

After some research I understand these modules

have different operating voltages maybe different

functions.

Is there any way to find out?

?

?

Sent from for Windows 10

?
Re: Changing Batteries in HP70000 equipment

 

Hi Paul,
At your suggestion?I have moved this over the 70000 group.
Waiting for my first?post to be approved.
Please provide either here or there details on where the battery is on the 70004.
Pictures on changing the battery in the 70900 is also appreciated.
Thanks
Dave?

On Sat, Apr 18, 2020 at 8:55 AM Paul Bicknell <paul@...> wrote:

Hi

?

Most modules do not have a battery ?but stand to be corrected

?

As I have a? 70900 open on the bench I will do some pictures relating to changing its battery

?

Just remembered have just bought another 70004? and not checked its battery? will do that whilst kettle boils for a drink ?

?

Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 18 April 2020 16:38
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Changing Batteries in HP70000 equipment

?

The purpose of this topic is to organize and summarize the replacement of batteries in the HP70000 modules?

I have several modules and no experience.?

It seems the manuals gloss over this important information.?

For instance the 70004A Service manual says if you get 6002 error replace BT1 ?Nowhere else in manual is there a reference to where it is and how you do it ?


Minimum information might be.
Module model number :70206
Battery Type : ?TL-4903/S. ?no wires.?
Directions: Remove battery access cover and change battery
Cautions : Install ?battery correct orientation.?


I will compile this information and post it somewhere.?


Thanks
Dave
VE7HR

No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.



--
72 de Dave
VE7HR
Re: HP 3478A Ohms Calibration

 

To? GROUP? members,
Many are mailing me to reserve Red Devid resistors for them.? Back in Minnesota there are enough Red Devil resistors to go aound.? The issue I am faced with is that I was hoping to get my 3458A DMMs caled to measure the resistors to the best I could before sending them out.? However, due to the virus issues, they will not be caled while I am here with no deffinited date given to me by Keysight.

When I get back to Minnesota, there is one 3458A that was caled 5 years ago that I can measure the resistors with if any of you cannot wait.? ?Eventually, I will be upgrading that 3458A? with high stability Ohms AND replacing the cal RAMS,? which can go bad any day now,? with more current date codes. Doing this?will loose the cal constants.? I have performed this upgrade already to my other two 3458A while here in Colorado so all three will be needed to have a NIST traceable cal after the upgrades.? Given the shutdown, I have no idea when this will occur.? I have purchased the cals and just waiting notification when to send the meters into Keysight for the Loveland cal.

Once the meters are caled, this is the plan I have for characterizing the Red Devil resistors for you:

Measure each resistor to 7 digits with a 8th digit guard band digit using three 3458A DMM with recent NIST certifiable cals.? Average the three readings.? This will be done at three different temperatures to withing +/- 0.1 C so you have an idea of the resistor tempco.? That is the plan.

Be patient.? It will be awhile before I can do this.? It is now dependent on when Keysight will schedule to cal my meters.? This was an unforseen problem.

George Hnatiuk
Re: Changing Batteries in HP70000 equipment

 

¿ªÔÆÌåÓý

Hi

?

Most modules do not have a battery ?but stand to be corrected

?

As I have a? 70900 open on the bench I will do some pictures relating to changing its battery

?

Just remembered have just bought another 70004? and not checked its battery? will do that whilst kettle boils for a drink ?

?

Regards Paul

?

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 18 April 2020 16:38
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Changing Batteries in HP70000 equipment

?

The purpose of this topic is to organize and summarize the replacement of batteries in the HP70000 modules?

I have several modules and no experience.?

It seems the manuals gloss over this important information.?

For instance the 70004A Service manual says if you get 6002 error replace BT1 ?Nowhere else in manual is there a reference to where it is and how you do it ?


Minimum information might be.
Module model number :70206
Battery Type : ?TL-4903/S. ?no wires.?
Directions: Remove battery access cover and change battery
Cautions : Install ?battery correct orientation.?


I will compile this information and post it somewhere.?


Thanks
Dave
VE7HR

No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
Changing Batteries in HP70000 equipment

 

The purpose of this topic is to organize and summarize the replacement of batteries in the HP70000 modules?

I have several modules and no experience.?

It seems the manuals gloss over this important information.?

For instance the 70004A Service manual says if you get 6002 error replace BT1 ?Nowhere else in manual is there a reference to where it is and how you do it ?


Minimum information might be.
Module model number :70206
Battery Type : ?TL-4903/S. ?no wires.?
Directions: Remove battery access cover and change battery
Cautions : Install ?battery correct orientation.?


I will compile this information and post it somewhere.?


Thanks
Dave
VE7HR
Re: HP 3478A Ohms Calibration

 

Gary and GROUP,
Yes, I can supply you with one.? ?I can help most of you that have mailed me with requests.? I may not answer you quickly as I am very busy these days packing and sorting but I will get back to each of you via EMAIL that have reached out to me.

If anyone has parts you are looking for, get to me while I am here is Colorado looking at my inventory here.? I will not be taking everything back to Minnesota with me for space is limited.? I have a 26 foot U-Haul truck and the priority items with be complete test instruments, protos, complete boards, documents and books from my library, loose parts (axial lead / ICs etc) and last will be incidental parts used in instruments.? ?I will get back here within a year to retreive what I leave behind but there is no guarantee when that will happen.

I will try my best to help you out.
Keep in mind, my main focus is to clear out my home here.? Packing and shipping parts is an added task that takes time away from my main focus but is not impossible to deal with.
George
Re: HP 70205A surprise

 

¿ªÔÆÌåÓý

Hi Dave and all?

?

There is a 70000 Group

?

We could put any service information we have on that site

?

Regarding? batteries for the 70900 it seams I will require a few

?

Regards Paul

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 18 April 2020 16:01
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 70205A surprise

?

Thanks Paul for those cautions.?

?

I had hoped someone had done an article or series of notes on the battery changing.?

Not to hijack this thread I will start a new one.?

?

Thanks

Dave

VE7HR?



On Apr 18, 2020, at 2:30 AM, Paul Bicknell <paul@...> wrote:

?

Hi all

?

Warning the 70900 a low / changing the battery ?will loose its program and a lot are not available ?

?

I will be soldering another battery in parallel on flying leads before removing the original

?

Before the present issues I was on the hunt for the original make as used by HP as they are considered the best

?

Also there are at lest 2 types used? ones with axial leads? at each ends?

The other without leads for the 70004 display

?

Regards Paul

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 18 April 2020 05:54
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 70205A surprise

?

I guess I need to get a bunch then as I have 4 of the 5 and multiple instances of some. ?

I am thinking the 70206 probably has one also?

?I see Digi-Key has them but can¡¯t ship to Canada. :-(

Thanks

Dave

VE7HR?




On Apr 17, 2020, at 9:27 PM, David & Laura <davidandlaura@...> wrote:

?

Off the top of my head, the following modules have batteries:

?

70004A Display

70100A Power Meter

70205A Display

70700A Digitizer (WARNING - disconnecting the battery causes program loss)

70900A/B LO

?

I think the optical spectrum analyzer modules have batteries too, but I've never looked inside one of those.

?

Lots of manuals are online here:?

?

Thanks,

?

David Slik

VE7FIM

?

On Fri, Apr 17, 2020 at 9:21 PM Dave Miller <ve7hr@...> wrote:

Now that is ugly :-(
A question.
I am guessing that is the battery that is in the 70000 modules.
Does some one have a quick reference to where they are located and which modules have them?
I am thinking I should change out mine.
I have a good collection of modules.
Thanks
Dave
VE7HR
> On Apr 17, 2020, at 9:17 PM, Dave McGuire <mcguire@...> wrote:
>
> ?On 4/18/20 12:10 AM, David & Laura wrote:
>> Went to pull a 70205A system display module off the shelf to install in
>> a 70001A, and found the following surprise:
>>
>> Evidently the module has (had) a TL-5104 3.6 Volt Lithium battery behind
>> that door, though I've never seen corrosion look like this before...
>
>? Wow.? THAT is what I call a mess!? I've never seen an Li cell go like
> that before either.? I wonder if someone put something else in there.
>
>? ? ? ? ? -Dave
>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
>
>
>



No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.

No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
Re: Do ManualsPlus still exist

 

Hi Dave

just came a cross their listing on this group and they had some manuals that
you don't have that I would have liked

Dave can we have a chat about 70K manuals regarding my last Email to you

Regards Paul

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of ArtekManuals
Sent: 18 April 2020 12:27
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Do ManualsPlus still exist

They pulled the plug about 4 years ago

Dave
manuals@...

On 4/18/2020 6:46 AM, Paul Bicknell wrote:
Hi all just ?a quick question

Do ManualsPlus?still exist ?as the last?information?I have is

ManualsPlus Inventory as of 12/23/14
email to sales@...


and i would like an ?up to date listing as interested in some of his
manuals

Regards Paul
--
Dave
Manuals@...
www.ArtekManuals.com


--
This email has been checked for viruses by Avast antivirus software.








-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
Re: HP 70205A surprise

 

¿ªÔÆÌåÓý

Thanks Paul for those cautions.?

I had hoped someone had done an article or series of notes on the battery changing.?
Not to hijack this thread I will start a new one.?

Thanks
Dave
VE7HR?


On Apr 18, 2020, at 2:30 AM, Paul Bicknell <paul@...> wrote:

?

Hi all

?

Warning the 70900 a low / changing the battery ?will loose its program and a lot are not available ?

?

I will be soldering another battery in parallel on flying leads before removing the original

?

Before the present issues I was on the hunt for the original make as used by HP as they are considered the best

?

Also there are at lest 2 types used? ones with axial leads? at each ends?

The other without leads for the 70004 display

?

Regards Paul

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 18 April 2020 05:54
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 70205A surprise

?

I guess I need to get a bunch then as I have 4 of the 5 and multiple instances of some. ?

I am thinking the 70206 probably has one also?

?I see Digi-Key has them but can¡¯t ship to Canada. :-(

Thanks

Dave

VE7HR?



On Apr 17, 2020, at 9:27 PM, David & Laura <davidandlaura@...> wrote:

?

Off the top of my head, the following modules have batteries:

?

70004A Display

70100A Power Meter

70205A Display

70700A Digitizer (WARNING - disconnecting the battery causes program loss)

70900A/B LO

?

I think the optical spectrum analyzer modules have batteries too, but I've never looked inside one of those.

?

Lots of manuals are online here:?

?

Thanks,

?

David Slik

VE7FIM

?

On Fri, Apr 17, 2020 at 9:21 PM Dave Miller <ve7hr@...> wrote:

Now that is ugly :-(
A question.
I am guessing that is the battery that is in the 70000 modules.
Does some one have a quick reference to where they are located and which modules have them?
I am thinking I should change out mine.
I have a good collection of modules.
Thanks
Dave
VE7HR
> On Apr 17, 2020, at 9:17 PM, Dave McGuire <mcguire@...> wrote:
>
> ?On 4/18/20 12:10 AM, David & Laura wrote:
>> Went to pull a 70205A system display module off the shelf to install in
>> a 70001A, and found the following surprise:
>>
>> Evidently the module has (had) a TL-5104 3.6 Volt Lithium battery behind
>> that door, though I've never seen corrosion look like this before...
>
>? Wow.? THAT is what I call a mess!? I've never seen an Li cell go like
> that before either.? I wonder if someone put something else in there.
>
>? ? ? ? ? -Dave
>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
>
>
>


No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
Re: Hints on removing burned tantalum residue

 

Hi Dave

The OP already has some days ago.

Attached MESFET data.

George G6HIG
On Saturday, 18 April 2020, 13:14:51 BST, Dave_G0WBX via groups.io <g8kbvdave@...> wrote:


Just another thought.

Try asking on the? [email protected]? list.? Re the
MESFET output stage problem.

Dave G0WBX.

(MI, Aeroflex, IFR, different names over the years, for the same products.)

--
Created on and sent from a Unix like PC running and using free and open source software:




HWF1681RA_V3.pdf
HWF1681RA_V3.pdf

Re: Hints on removing burned tantalum residue

 

Just another thought.

Try asking on the? [email protected]? list.? Re the
MESFET output stage problem.

Dave G0WBX.

(MI, Aeroflex, IFR, different names over the years, for the same products.)

--
Created on and sent from a Unix like PC running and using free and open source software:
Re: Hints on removing burned tantalum residue

 

¿ªÔÆÌåÓý

Hi.

Re:-

Not having the Aeroflex 3416 MESFET data sheets? nor the signal generator schematics is difficult.

The Areoflex MESFET's are very HOT all the time, with no Rf output of any kind.
I will try to trace out the circuit.

I think those devices may need -ve Gate bias to run correctly, so you might want to check that, and if missing, find out where it should have come from.


It seems that MESFET and GASFET devices are similar, and I do know that power GASFET's most certainly need a -ve bias to run correctly, plus that is often implemented these days, within an automatic bias and protection scheme, so that if the -ve bias source fails, the +ve power source for the Drain is disconnected, preventing device damage or distruction of the 'FET's.

Hope something helps.

Dave B

G0WBX

-- 
Created on and sent from a Unix like PC running and using free and open source software:

Re: Do ManualsPlus still exist

 

They pulled the plug about 4 years ago

Dave
manuals@...

On 4/18/2020 6:46 AM, Paul Bicknell wrote:
Hi all just ?a quick question

Do ManualsPlus?still exist ?as the last?information?I have is

ManualsPlus Inventory as of 12/23/14
email to sales@...


and i would like an ?up to date listing as interested in some of his manuals

Regards Paul
--
Dave
Manuals@...
www.ArtekManuals.com
--
This email has been checked for viruses by Avast antivirus software.
Do ManualsPlus still exist

 

Hi all just ?a quick question ?

Do ?ManualsPlus?still exist ?as the last?information?I have is?

ManualsPlus Inventory as of 12/23/14
email to sales@...

and i would like an ?up to date listing as interested in some of his manuals?

Regards Paul?
Re: HP 70205A surprise

 

¿ªÔÆÌåÓý

Hi all

?

Warning the 70900 a low / changing the battery ?will loose its program and a lot are not available ?

?

I will be soldering another battery in parallel on flying leads before removing the original

?

Before the present issues I was on the hunt for the original make as used by HP as they are considered the best

?

Also there are at lest 2 types used? ones with axial leads? at each ends?

The other without leads for the 70004 display

?

Regards Paul

From: [email protected] [mailto:[email protected]] On Behalf Of Dave Miller
Sent: 18 April 2020 05:54
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 70205A surprise

?

I guess I need to get a bunch then as I have 4 of the 5 and multiple instances of some. ?

I am thinking the 70206 probably has one also?

?I see Digi-Key has them but can¡¯t ship to Canada. :-(

Thanks

Dave

VE7HR?



On Apr 17, 2020, at 9:27 PM, David & Laura <davidandlaura@...> wrote:

?

Off the top of my head, the following modules have batteries:

?

70004A Display

70100A Power Meter

70205A Display

70700A Digitizer (WARNING - disconnecting the battery causes program loss)

70900A/B LO

?

I think the optical spectrum analyzer modules have batteries too, but I've never looked inside one of those.

?

Lots of manuals are online here:?

?

Thanks,

?

David Slik

VE7FIM

?

On Fri, Apr 17, 2020 at 9:21 PM Dave Miller <ve7hr@...> wrote:

Now that is ugly :-(
A question.
I am guessing that is the battery that is in the 70000 modules.
Does some one have a quick reference to where they are located and which modules have them?
I am thinking I should change out mine.
I have a good collection of modules.
Thanks
Dave
VE7HR
> On Apr 17, 2020, at 9:17 PM, Dave McGuire <mcguire@...> wrote:
>
> ?On 4/18/20 12:10 AM, David & Laura wrote:
>> Went to pull a 70205A system display module off the shelf to install in
>> a 70001A, and found the following surprise:
>>
>> Evidently the module has (had) a TL-5104 3.6 Volt Lithium battery behind
>> that door, though I've never seen corrosion look like this before...
>
>? Wow.? THAT is what I call a mess!? I've never seen an Li cell go like
> that before either.? I wonder if someone put something else in there.
>
>? ? ? ? ? -Dave
>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
>
>
>


No virus found in this message.
Checked by AVG -
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.
Re: HP 652A Dial Calibration

 

DON'T bend the tabs, no matter how desperate you get. I once had an HRO receiver where a previous owner had bent the tabs to get perfect tracking at the 50 kHz calibration marker frequencies. Unfortunately, the tabs now looked like the edge of a saw, and the freq was more than 10 kHz off between some of the 50 kHz steps.

Bending the plates in the 652A would be worse, as the three sections of the tuning cap C1 should track each other. I would suspect an imbalance would cause the amplitude to vary with frequency more than allowable.

John

On 4/17/2020 9:51 AM, n4buq wrote:
After having the lubrication sieze the dial mechanism so tightly I could hardly move the dial on my 652A, I disassembled, cleaned, relubricated, and reassembled the entire mechanism. Naturally, I lost what synchronization the dial had with the tuning capacitor so I performed the dial calibration steps in the manual.
In the X10 range, I was able to get the endpoints virtually spot on; however, some of the integer points on the dial do not track within the tolerances given in the table in the manual. Oddly, at "10", the frequency is almost exactly 10.000; however, at "9", the accuracy deviates rather noticeably (maybe still in calibration but well more than I'd expect) and at many of the midpoints, it is out of tolerance.
While the manual gives the acceptable deviation values at various points on the dial, I'm not seeing anything that states what to do if those don't meet the specification. I know this subject has come up with regards to other signal generators (e.g. the 606, etc.) and "bending the fins" or "slipping the dial" have been suggested as possible solutions. Given that the manual already covers the proper method of slipping the dial (to get the end points set), I'm not sure that would apply here and I really, really hesitate to get into fin-bending as this cap has somewhat smaller fins than, say, the ones in a 606.
Anyone familiar with this and maybe have some suggestions as to fix it?
Thanks,
Barry - N4BUQ
Re: HP 70205A surprise

 

¿ªÔÆÌåÓý

I guess I need to get a bunch then as I have 4 of the 5 and multiple instances of some. ?
I am thinking the 70206 probably has one also?
?I see Digi-Key has them but can¡¯t ship to Canada. :-(
Thanks
Dave
VE7HR?


On Apr 17, 2020, at 9:27 PM, David & Laura <davidandlaura@...> wrote:

?
Off the top of my head, the following modules have batteries:

70004A Display
70100A Power Meter
70205A Display
70700A Digitizer (WARNING - disconnecting the battery causes program loss)
70900A/B LO

I think the optical spectrum analyzer modules have batteries too, but I've never looked inside one of those.

Lots of manuals are online here:?

Thanks,

David Slik
VE7FIM

On Fri, Apr 17, 2020 at 9:21 PM Dave Miller <ve7hr@...> wrote:
Now that is ugly :-(
A question.
I am guessing that is the battery that is in the 70000 modules.
Does some one have a quick reference to where they are located and which modules have them?
I am thinking I should change out mine.
I have a good collection of modules.
Thanks
Dave
VE7HR
> On Apr 17, 2020, at 9:17 PM, Dave McGuire <mcguire@...> wrote:
>
> ?On 4/18/20 12:10 AM, David & Laura wrote:
>> Went to pull a 70205A system display module off the shelf to install in
>> a 70001A, and found the following surprise:
>>
>> Evidently the module has (had) a TL-5104 3.6 Volt Lithium battery behind
>> that door, though I've never seen corrosion look like this before...
>
>? Wow.? THAT is what I call a mess!? I've never seen an Li cell go like
> that before either.? I wonder if someone put something else in there.
>
>? ? ? ? ? -Dave
>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
>
>
>



Re: HP 70205A surprise

 

Off the top of my head, the following modules have batteries:

70004A Display
70100A Power Meter
70205A Display
70700A Digitizer (WARNING - disconnecting the battery causes program loss)
70900A/B LO

I think the optical spectrum analyzer modules have batteries too, but I've never looked inside one of those.

Lots of manuals are online here:?

Thanks,

David Slik
VE7FIM


On Fri, Apr 17, 2020 at 9:21 PM Dave Miller <ve7hr@...> wrote:
Now that is ugly :-(
A question.
I am guessing that is the battery that is in the 70000 modules.
Does some one have a quick reference to where they are located and which modules have them?
I am thinking I should change out mine.
I have a good collection of modules.
Thanks
Dave
VE7HR
> On Apr 17, 2020, at 9:17 PM, Dave McGuire <mcguire@...> wrote:
>
> ?On 4/18/20 12:10 AM, David & Laura wrote:
>> Went to pull a 70205A system display module off the shelf to install in
>> a 70001A, and found the following surprise:
>>
>> Evidently the module has (had) a TL-5104 3.6 Volt Lithium battery behind
>> that door, though I've never seen corrosion look like this before...
>
>? Wow.? THAT is what I call a mess!? I've never seen an Li cell go like
> that before either.? I wonder if someone put something else in there.
>
>? ? ? ? ? -Dave
>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
>
>
>



Re: HP 70205A surprise

 

Now that is ugly :-(
A question.
I am guessing that is the battery that is in the 70000 modules.
Does some one have a quick reference to where they are located and which modules have them?
I am thinking I should change out mine.
I have a good collection of modules.
Thanks
Dave
VE7HR

On Apr 17, 2020, at 9:17 PM, Dave McGuire <mcguire@...> wrote:

?On 4/18/20 12:10 AM, David & Laura wrote:
Went to pull a 70205A system display module off the shelf to install in
a 70001A, and found the following surprise:

Evidently the module has (had) a TL-5104 3.6 Volt Lithium battery behind
that door, though I've never seen corrosion look like this before...
Wow. THAT is what I call a mess! I've never seen an Li cell go like
that before either. I wonder if someone put something else in there.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: HP 70205A surprise

 

On 4/18/20 12:10 AM, David & Laura wrote:
Went to pull a 70205A system display module off the shelf to install in
a 70001A, and found the following surprise:

Evidently the module has (had) a?TL-5104 3.6 Volt Lithium battery behind
that door, though I've never seen corrosion?look like this before...
Wow. THAT is what I call a mess! I've never seen an Li cell go like
that before either. I wonder if someone put something else in there.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
46501 - 46520 of 151561