DM
Dick Moore
Mon, Mar 22, 2010 7:49 PM
Message: 2
Date: Mon, 22 Mar 2010 10:07:13 -0000
From: "Roy Phillips" phill.r1@btinternet.com
Subject: Re: [volt-nuts] Mechanical choppers
Dick
I have a faulty HP 419 Null Meter with this problem. Have you encountered
these ?
regards
Roy Phillips.
Roy, I've tried to buy one, but have never actually seen or used one, and am not familiar with the circuit it uses. I would say that most choppers of any kind can be upgraded somehow. If you have a circuit diagram, I can comment on how I might proceed....
Best,
Dick Moore
On Mar 22, 2010, at 5:00 AM, volt-nuts-request@febo.com wrote:
> Message: 2
> Date: Mon, 22 Mar 2010 10:07:13 -0000
> From: "Roy Phillips" <phill.r1@btinternet.com>
> Subject: Re: [volt-nuts] Mechanical choppers
>
> Dick
> I have a faulty HP 419 Null Meter with this problem. Have you encountered
> these ?
> regards
> Roy Phillips.
Roy, I've tried to buy one, but have never actually seen or used one, and am not familiar with the circuit it uses. I would say that most choppers of any kind can be upgraded somehow. If you have a circuit diagram, I can comment on how I might proceed....
Best,
Dick Moore
AS
Alan Scrimgeour
Tue, Mar 23, 2010 12:45 AM
Sorry, here's the link:
http://translate.google.co.uk/translate?hl=en&sl=zh-CN&u=http://www.ourdev.cn/bbs/bbs_content.jsp%3Fbbs_sn%3D3593996%26bbs_page_no%3D3%26search_mode%3D4%26search_text%3Dlysoft%26bbs_id%3D9999&ei=csanS_-_Fdq5jAfl--CQAQ&sa=X&oi=translate&ct=result&resnum=1&ved=0CAoQ7gEwAA&prev=/search%3Fq%3DLTZ1000%25E6%2598%25AFLinear%25E5%2585%25AC%25E5%258F%25B8%25E5%259C%25A820%25E4%25B8%2596%25E7%25BA%25AA80%25E5%25B9%25B4%25E4%25BB%25A3%25E5%25BC%2580%25E5%25A7%258B%25E7%2594%259F%25E4%25BA%25A7%25E7%259A%2584%25E7%2594%25B5%25E5%258E%258B%25E5%259F%25BA%25E5%2587%2586%25E5%2585%2583%25E4%25BB%25B6%26hl%3Den%26client%3Dfirefox-a%26hs%3DpJT%26rls%3Dorg.mozilla:en-GB:official
If that stops working use Google or whatever to translate the original page:
http://www.ourdev.cn/bbs/bbs_content.jsp?bbs_sn=3593996&bbs_page_no=3&search_mode=4&search_text=lysoft&bbs_id=9999
Alan
RP
Roy Phillips
Tue, Mar 23, 2010 5:28 PM
Dick
Thanks - - I think I have the manual/schematics and will look for them and
forward a copy. I would like to restore it as I have been unable to obtain
a Fluke 845 AB to date.
Regards
Roy
From: "Dick Moore" richiem@hughes.net
Sent: Monday, March 22, 2010 7:49 PM
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Mechanical choppers
Message: 2
Date: Mon, 22 Mar 2010 10:07:13 -0000
From: "Roy Phillips" phill.r1@btinternet.com
Subject: Re: [volt-nuts] Mechanical choppers
Dick
I have a faulty HP 419 Null Meter with this problem. Have you
encountered
these ?
regards
Roy Phillips.
Roy, I've tried to buy one, but have never actually seen or used one, and
am not familiar with the circuit it uses. I would say that most choppers
of any kind can be upgraded somehow. If you have a circuit diagram, I can
comment on how I might proceed....
Best,
Dick Moore
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
Dick
Thanks - - I think I have the manual/schematics and will look for them and
forward a copy. I would like to restore it as I have been unable to obtain
a Fluke 845 AB to date.
Regards
Roy
--------------------------------------------------
From: "Dick Moore" <richiem@hughes.net>
Sent: Monday, March 22, 2010 7:49 PM
To: <volt-nuts@febo.com>
Subject: Re: [volt-nuts] Mechanical choppers
>
> On Mar 22, 2010, at 5:00 AM, volt-nuts-request@febo.com wrote:
>
>> Message: 2
>> Date: Mon, 22 Mar 2010 10:07:13 -0000
>> From: "Roy Phillips" <phill.r1@btinternet.com>
>> Subject: Re: [volt-nuts] Mechanical choppers
>>
>> Dick
>> I have a faulty HP 419 Null Meter with this problem. Have you
>> encountered
>> these ?
>> regards
>> Roy Phillips.
>
> Roy, I've tried to buy one, but have never actually seen or used one, and
> am not familiar with the circuit it uses. I would say that most choppers
> of any kind can be upgraded somehow. If you have a circuit diagram, I can
> comment on how I might proceed....
>
> Best,
> Dick Moore
> _______________________________________________
> volt-nuts mailing list -- volt-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.
>
MK
Mark Kahrs
Tue, Mar 23, 2010 7:58 PM
So, where are these dedicated men of fashion getting their LTZ1000s?
It would seem they are "used" from the photo.
On Mon, Mar 22, 2010 at 8:45 PM, Alan Scrimgeour
scrimgap@blueyonder.co.uk wrote:
So, where are these dedicated men of fashion getting their LTZ1000s?
It would seem they are "used" from the photo.
On Mon, Mar 22, 2010 at 8:45 PM, Alan Scrimgeour
<scrimgap@blueyonder.co.uk> wrote:
> Sorry, here's the link:
> http://translate.google.co.uk/translate?hl=en&sl=zh-CN&u=http://www.ourdev.cn/bbs/bbs_content.jsp%3Fbbs_sn%3D3593996%26bbs_page_no%3D3%26search_mode%3D4%26search_text%3Dlysoft%26bbs_id%3D9999&ei=csanS_-_Fdq5jAfl--CQAQ&sa=X&oi=translate&ct=result&resnum=1&ved=0CAoQ7gEwAA&prev=/search%3Fq%3DLTZ1000%25E6%2598%25AFLinear%25E5%2585%25AC%25E5%258F%25B8%25E5%259C%25A820%25E4%25B8%2596%25E7%25BA%25AA80%25E5%25B9%25B4%25E4%25BB%25A3%25E5%25BC%2580%25E5%25A7%258B%25E7%2594%259F%25E4%25BA%25A7%25E7%259A%2584%25E7%2594%25B5%25E5%258E%258B%25E5%259F%25BA%25E5%2587%2586%25E5%2585%2583%25E4%25BB%25B6%26hl%3Den%26client%3Dfirefox-a%26hs%3DpJT%26rls%3Dorg.mozilla:en-GB:official
>
> If that stops working use Google or whatever to translate the original page:
> http://www.ourdev.cn/bbs/bbs_content.jsp?bbs_sn=3593996&bbs_page_no=3&search_mode=4&search_text=lysoft&bbs_id=9999
>
> Alan
>
>
>
> _______________________________________________
> volt-nuts mailing list -- volt-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.
>
AS
Alan Scrimgeour
Tue, Mar 23, 2010 8:09 PM
So, where are these dedicated men of fashion getting their LTZ1000s?
It would seem they are "used" from the photo.
On Mon, Mar 22, 2010 at 8:45 PM, Alan Scrimgeour
scrimgap@blueyonder.co.uk wrote:
There are two sellers of the LTZ1000 on eBay. Both are selling second hand.
Both are in Hong Kong:
http://cgi.ebay.co.uk/LTZ1000-LTZ1000ACH-Ultra-Precision-Reference-IC-1-PC_W0QQitemZ370344520067
http://cgi.ebay.co.uk/Ultra-Precision-Reference-IC-LTZ1000-LTZ1000ACH_W0QQitemZ260474645765QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ca57fad05
I can't imagine where they get them from.
Alan
----- Original Message -----
From: "Mark Kahrs" <mark.kahrs@gmail.com>
To: "Discussion of precise voltage measurement" <volt-nuts@febo.com>
Sent: Tuesday, March 23, 2010 7:58 PM
Subject: Re: [volt-nuts] More Chinese Volt Nuts Stuff- LTZ1000
> So, where are these dedicated men of fashion getting their LTZ1000s?
> It would seem they are "used" from the photo.
>
> On Mon, Mar 22, 2010 at 8:45 PM, Alan Scrimgeour
> <scrimgap@blueyonder.co.uk> wrote:
>> Sorry, here's the link:
>> http://translate.google.co.uk/translate?hl=en&sl=zh-CN&u=http://www.ourdev.cn/bbs/bbs_content.jsp%3Fbbs_sn%3D3593996%26bbs_page_no%3D3%26search_mode%3D4%26search_text%3Dlysoft%26bbs_id%3D9999&ei=csanS_-_Fdq5jAfl--CQAQ&sa=X&oi=translate&ct=result&resnum=1&ved=0CAoQ7gEwAA&prev=/search%3Fq%3DLTZ1000%25E6%2598%25AFLinear%25E5%2585%25AC%25E5%258F%25B8%25E5%259C%25A820%25E4%25B8%2596%25E7%25BA%25AA80%25E5%25B9%25B4%25E4%25BB%25A3%25E5%25BC%2580%25E5%25A7%258B%25E7%2594%259F%25E4%25BA%25A7%25E7%259A%2584%25E7%2594%25B5%25E5%258E%258B%25E5%259F%25BA%25E5%2587%2586%25E5%2585%2583%25E4%25BB%25B6%26hl%3Den%26client%3Dfirefox-a%26hs%3DpJT%26rls%3Dorg.mozilla:en-GB:official
>>
>> If that stops working use Google or whatever to translate the original
>> page:
>> http://www.ourdev.cn/bbs/bbs_content.jsp?bbs_sn=3593996&bbs_page_no=3&search_mode=4&search_text=lysoft&bbs_id=9999
>>
>> Alan
>>
>>
>>
>> _______________________________________________
>> volt-nuts mailing list -- volt-nuts@febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
>> and follow the instructions there.
>>
>
> _______________________________________________
> volt-nuts mailing list -- volt-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.
PK
Poul-Henning Kamp
Tue, Mar 23, 2010 8:19 PM
There are two sellers of the LTZ1000 on eBay. Both are selling second hand.
Both are in Hong Kong:
I can't imagine where they get them from.
They get them from the very efficient electronics recycling industries
in India, Pakistan and mainland China.
All the eletronic crap that EU and USA "recycle" gets shipped to asia
and gets dismantled and sorted through in some of the most hazardous
landfills you could even imagine.
Many of these components are unsoldered by warming the PCB over a
bonfire and then shaking and scraping the components loose into old
oil-bins or plastic buckets.
The components gets sold by the pound, to "sorters" and from there
they end up in electronics, toys, radios, tvs etc, and for specialty
high-value components like the LTZ1000: on ebay.
The LTZ1000's may just happen have been carefully selected by HP
for a HP3458A-opt4, that was later dropped from an army-truck, but
it was unsoldered by child labour over open fire and you probably
get what you pay for...
Poul-Henning
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
In message <6C78C7F117B84B5C8C2226815C0AFBB4@AlanPC>, "Alan Scrimgeour" writes:
>There are two sellers of the LTZ1000 on eBay. Both are selling second hand.
>Both are in Hong Kong:
>I can't imagine where they get them from.
They get them from the very efficient electronics recycling industries
in India, Pakistan and mainland China.
All the eletronic crap that EU and USA "recycle" gets shipped to asia
and gets dismantled and sorted through in some of the most hazardous
landfills you could even imagine.
Many of these components are unsoldered by warming the PCB over a
bonfire and then shaking and scraping the components loose into old
oil-bins or plastic buckets.
The components gets sold by the pound, to "sorters" and from there
they end up in electronics, toys, radios, tvs etc, and for specialty
high-value components like the LTZ1000: on ebay.
The LTZ1000's may just happen have been carefully selected by HP
for a HP3458A-opt4, that was later dropped from an army-truck, but
it was unsoldered by child labour over open fire and you probably
get what you pay for...
Poul-Henning
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
SR
Stanley Reynolds
Tue, Mar 23, 2010 8:56 PM
Use a toaster oven here for parts not easy to remove with iron and solder sucker. In the past used butane touch and locking pliers but this takes more skill. A dremel tool with cut off wheel to cut pc board or metal sheer when I want to use a sub system like power line filter or power supply. I don't think this is time or cost effective but it does reduce the storage space for my junk.
Stanley
----- Original Message ----
From: Poul-Henning Kamp phk@phk.freebsd.dk
To: Discussion of precise voltage measurement volt-nuts@febo.com
Sent: Tue, March 23, 2010 3:19:41 PM
Subject: Re: [volt-nuts] More Chinese Volt Nuts Stuff- LTZ1000
In message 6C78C7F117B84B5C8C2226815C0AFBB4@AlanPC, "Alan Scrimgeour" writes:
There are two sellers of the LTZ1000 on eBay. Both are selling second hand.
Both are in Hong Kong:
I can't imagine where they get them from.
They get them from the very efficient electronics recycling industries
in India, Pakistan and mainland China.
All the eletronic crap that EU and USA "recycle" gets shipped to asia
and gets dismantled and sorted through in some of the most hazardous
landfills you could even imagine.
Many of these components are unsoldered by warming the PCB over a
bonfire and then shaking and scraping the components loose into old
oil-bins or plastic buckets.
The components gets sold by the pound, to "sorters" and from there
they end up in electronics, toys, radios, tvs etc, and for specialty
high-value components like the LTZ1000: on ebay.
The LTZ1000's may just happen have been carefully selected by HP
for a HP3458A-opt4, that was later dropped from an army-truck, but
it was unsoldered by child labour over open fire and you probably
get what you pay for...
Poul-Henning
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
Use a toaster oven here for parts not easy to remove with iron and solder sucker. In the past used butane touch and locking pliers but this takes more skill. A dremel tool with cut off wheel to cut pc board or metal sheer when I want to use a sub system like power line filter or power supply. I don't think this is time or cost effective but it does reduce the storage space for my junk.
Stanley
----- Original Message ----
From: Poul-Henning Kamp <phk@phk.freebsd.dk>
To: Discussion of precise voltage measurement <volt-nuts@febo.com>
Sent: Tue, March 23, 2010 3:19:41 PM
Subject: Re: [volt-nuts] More Chinese Volt Nuts Stuff- LTZ1000
In message <6C78C7F117B84B5C8C2226815C0AFBB4@AlanPC>, "Alan Scrimgeour" writes:
>There are two sellers of the LTZ1000 on eBay. Both are selling second hand.
>Both are in Hong Kong:
>I can't imagine where they get them from.
They get them from the very efficient electronics recycling industries
in India, Pakistan and mainland China.
All the eletronic crap that EU and USA "recycle" gets shipped to asia
and gets dismantled and sorted through in some of the most hazardous
landfills you could even imagine.
Many of these components are unsoldered by warming the PCB over a
bonfire and then shaking and scraping the components loose into old
oil-bins or plastic buckets.
The components gets sold by the pound, to "sorters" and from there
they end up in electronics, toys, radios, tvs etc, and for specialty
high-value components like the LTZ1000: on ebay.
The LTZ1000's may just happen have been carefully selected by HP
for a HP3458A-opt4, that was later dropped from an army-truck, but
it was unsoldered by child labour over open fire and you probably
get what you pay for...
Poul-Henning
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
_______________________________________________
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
CH
Chuck Harris
Tue, Mar 23, 2010 10:27 PM
The LTZ1000's may just happen have been carefully selected by HP
for a HP3458A-opt4, that was later dropped from an army-truck, but
it was unsoldered by child labour over open fire and you probably
get what you pay for...
Poul-Henning
Yes, but it has that zesty barbecue flavor that we all love...
-Chuck Harris
Poul-Henning Kamp wrote:
> The LTZ1000's may just happen have been carefully selected by HP
> for a HP3458A-opt4, that was later dropped from an army-truck, but
> it was unsoldered by child labour over open fire and you probably
> get what you pay for...
>
> Poul-Henning
Yes, but it has that zesty barbecue flavor that we all love...
-Chuck Harris
AS
Alan Scrimgeour
Wed, Mar 24, 2010 12:36 AM
It's hard to imagine that many LTZ1000 getting thrown away yet.
Alan
----- Original Message -----
From: "Poul-Henning Kamp" phk@phk.freebsd.dk
To: "Discussion of precise voltage measurement" volt-nuts@febo.com
Sent: Tuesday, March 23, 2010 8:19 PM
Subject: Re: [volt-nuts] More Chinese Volt Nuts Stuff- LTZ1000
There are two sellers of the LTZ1000 on eBay. Both are selling second
hand.
Both are in Hong Kong:
I can't imagine where they get them from.
They get them from the very efficient electronics recycling industries
in India, Pakistan and mainland China.
All the eletronic crap that EU and USA "recycle" gets shipped to asia
and gets dismantled and sorted through in some of the most hazardous
landfills you could even imagine.
Many of these components are unsoldered by warming the PCB over a
bonfire and then shaking and scraping the components loose into old
oil-bins or plastic buckets.
The components gets sold by the pound, to "sorters" and from there
they end up in electronics, toys, radios, tvs etc, and for specialty
high-value components like the LTZ1000: on ebay.
The LTZ1000's may just happen have been carefully selected by HP
for a HP3458A-opt4, that was later dropped from an army-truck, but
it was unsoldered by child labour over open fire and you probably
get what you pay for...
Poul-Henning
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by
incompetence.
volt-nuts mailing list -- volt-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
and follow the instructions there.
It's hard to imagine that many LTZ1000 getting thrown away yet.
Alan
----- Original Message -----
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
To: "Discussion of precise voltage measurement" <volt-nuts@febo.com>
Sent: Tuesday, March 23, 2010 8:19 PM
Subject: Re: [volt-nuts] More Chinese Volt Nuts Stuff- LTZ1000
> In message <6C78C7F117B84B5C8C2226815C0AFBB4@AlanPC>, "Alan Scrimgeour"
> writes:
>
>>There are two sellers of the LTZ1000 on eBay. Both are selling second
>>hand.
>>Both are in Hong Kong:
>
>>I can't imagine where they get them from.
>
> They get them from the very efficient electronics recycling industries
> in India, Pakistan and mainland China.
>
> All the eletronic crap that EU and USA "recycle" gets shipped to asia
> and gets dismantled and sorted through in some of the most hazardous
> landfills you could even imagine.
>
> Many of these components are unsoldered by warming the PCB over a
> bonfire and then shaking and scraping the components loose into old
> oil-bins or plastic buckets.
>
> The components gets sold by the pound, to "sorters" and from there
> they end up in electronics, toys, radios, tvs etc, and for specialty
> high-value components like the LTZ1000: on ebay.
>
> The LTZ1000's may just happen have been carefully selected by HP
> for a HP3458A-opt4, that was later dropped from an army-truck, but
> it was unsoldered by child labour over open fire and you probably
> get what you pay for...
>
> Poul-Henning
>
> --
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> phk@FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by
> incompetence.
>
> _______________________________________________
> volt-nuts mailing list -- volt-nuts@febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.
PK
Poul-Henning Kamp
Wed, Mar 24, 2010 7:55 AM
It's hard to imagine that many LTZ1000 getting thrown away yet.
Absolutely not, it is the reference of choice and is uses in a lot
of industrial kit you have never heard about.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
In message <1C2A388727384799AF7FF40C0A696FD5@AlanPC>, "Alan Scrimgeour" writes:
>It's hard to imagine that many LTZ1000 getting thrown away yet.
Absolutely not, it is the reference of choice and is uses in a lot
of industrial kit you have never heard about.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
