| Author |
Message |
DaveM
Guest
|
 Posted:
Sun May 15, 2005 5:36 am Post subject:
Re: Kelvin clips (was Re: In the Mkt for a HP Bench DMM) |
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"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:118c2b6ip03r06a@corp.supernews.com...
| Quote: |
"David DiGiacomo" <david@slack.com> wrote in message
news:1189i7orccci2ab@corp.supernews.com...
Hosfelt Electronics sells Mueller Kelvin clips for $7.50 each, item #
52-75K. I guess they must be available from other Mueller
distributors
also. They have copper contacts.
--
David DiGiacomo, San Francisco, CA david@slack.com
Thanks. Last year I ordered some from either them or some other similar
electronics distrib, and they said they were out of stock with no date
for an ETA. So I cancelled. I think that the smaller dealers like
Hosfelt are ordering small quantities from another distrib and can't
possibly keep enough in stock, and neither can the distrib they're
ordering from. In other words, the supply can't possibly keep up with
the demand. But it's not like we can't live without them.
|
I also ordered a couple sets of the Kelvin clips from Hosfelt some time ago.
THey were out of stock at the time I ordered them, but I really wanted thm,
so I let them stay on backorder. They finally arrived some months later.
They are not high quality clips.. held together by a small rubber band
that provides the "spring" tension. But they do work, and for the price,
they are good enough, since I don't use them in a production environment.
--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)
Never take a laxative and a sleeping pill at the same time!!
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Watson A.Name - \"Watt Su
Guest
|
| Posted:
Sun May 15, 2005 5:52 am Post subject:
Re: Kelvin clips (was Re: In the Mkt for a HP Bench DMM) |
|
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"DaveM" <masondg4499@comcast99.net> wrote in message
news:lIydnb6E6J0HBBvfRVn-jg@comcast.com...
| Quote: | "Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com
wrote
in message news:118c2b6ip03r06a@corp.supernews.com...
"David DiGiacomo" <david@slack.com> wrote in message
news:1189i7orccci2ab@corp.supernews.com...
Hosfelt Electronics sells Mueller Kelvin clips for $7.50 each, item
#
52-75K. I guess they must be available from other Mueller
distributors
also. They have copper contacts.
--
David DiGiacomo, San Francisco, CA david@slack.com
Thanks. Last year I ordered some from either them or some other
similar
electronics distrib, and they said they were out of stock with no
date
for an ETA. So I cancelled. I think that the smaller dealers like
Hosfelt are ordering small quantities from another distrib and can't
possibly keep enough in stock, and neither can the distrib they're
ordering from. In other words, the supply can't possibly keep up
with
the demand. But it's not like we can't live without them.
I also ordered a couple sets of the Kelvin clips from Hosfelt some
time ago.
THey were out of stock at the time I ordered them, but I really wanted
thm,
so I let them stay on backorder. They finally arrived some months
later.
They are not high quality clips.. held together by a small rubber
band
that provides the "spring" tension. But they do work, and for the
price,
they are good enough, since I don't use them in a production
environment. |
Sounds like I'm fortunate to have cancelled my order. I can make a set
that's just as good.
BTW, it's against the law to hold someone's order for more than 8
weeks(?) without informing the buyer that he has the option of
cancelling or getting a refund. Or else allowing the seller to hold the
money until the items arrive.
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Robert Baer
Guest
|
| Posted:
Sun May 15, 2005 3:55 pm Post subject:
Re: Kelvin clips (was Re: In the Mkt for a HP Bench DMM) |
|
|
DaveM wrote:
| Quote: | "Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com> wrote
in message news:118c2b6ip03r06a@corp.supernews.com...
"David DiGiacomo" <david@slack.com> wrote in message
news:1189i7orccci2ab@corp.supernews.com...
Hosfelt Electronics sells Mueller Kelvin clips for $7.50 each, item #
52-75K. I guess they must be available from other Mueller
distributors
also. They have copper contacts.
--
David DiGiacomo, San Francisco, CA david@slack.com
Thanks. Last year I ordered some from either them or some other similar
electronics distrib, and they said they were out of stock with no date
for an ETA. So I cancelled. I think that the smaller dealers like
Hosfelt are ordering small quantities from another distrib and can't
possibly keep enough in stock, and neither can the distrib they're
ordering from. In other words, the supply can't possibly keep up with
the demand. But it's not like we can't live without them.
I also ordered a couple sets of the Kelvin clips from Hosfelt some time ago.
THey were out of stock at the time I ordered them, but I really wanted thm,
so I let them stay on backorder. They finally arrived some months later.
They are not high quality clips.. held together by a small rubber band
that provides the "spring" tension. But they do work, and for the price,
they are good enough, since I don't use them in a production environment.
Seems to me that anyone could kludge some up by using (plastic) |
clothespins, copper (sticky on one side) tape, and wire.
Quality would be at least as good.
Tinning the copper tape would make it less suceptable to oxidation
and easier to keep clean.
Or get "fancy" and use thin galvanized sheet metal cut into narrow
strips; bend to fit around each jaw, solder on the leads and then epozy
the strips to the jaws.
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Watson A.Name - \"Watt Su
Guest
|
| Posted:
Sun May 15, 2005 4:35 pm Post subject:
Re: Kelvin clips (was Re: In the Mkt for a HP Bench DMM) |
|
|
"Robert Baer" <robertbaer@earthlink.net> wrote in message
news:nUFhe.1522$Ri4.404@newsread1.news.pas.earthlink.net...
| Quote: | DaveM wrote:
"Watson A.Name - "Watt Sun, the Dark Remover""
NOSPAM@dslextreme.com> wrote
in message news:118c2b6ip03r06a@corp.supernews.com...
"David DiGiacomo" <david@slack.com> wrote in message
news:1189i7orccci2ab@corp.supernews.com...
Hosfelt Electronics sells Mueller Kelvin clips for $7.50 each, item
#
52-75K. I guess they must be available from other Mueller
distributors
also. They have copper contacts.
--
David DiGiacomo, San Francisco, CA david@slack.com
Thanks. Last year I ordered some from either them or some other
similar
electronics distrib, and they said they were out of stock with no
date
for an ETA. So I cancelled. I think that the smaller dealers like
Hosfelt are ordering small quantities from another distrib and can't
possibly keep enough in stock, and neither can the distrib they're
ordering from. In other words, the supply can't possibly keep up
with
the demand. But it's not like we can't live without them.
I also ordered a couple sets of the Kelvin clips from Hosfelt some
time ago.
THey were out of stock at the time I ordered them, but I really
wanted thm,
so I let them stay on backorder. They finally arrived some months
later.
They are not high quality clips.. held together by a small rubber
band
that provides the "spring" tension. But they do work, and for the
price,
they are good enough, since I don't use them in a production
environment.
Seems to me that anyone could kludge some up by using (plastic)
clothespins, copper (sticky on one side) tape, and wire.
Quality would be at least as good.
Tinning the copper tape would make it less suceptable to oxidation
and easier to keep clean.
Or get "fancy" and use thin galvanized sheet metal cut into narrow
strips; bend to fit around each jaw, solder on the leads and then
epozy
the strips to the jaws.
|
The galvanic action between different metals makes the readings
inaccurate. Therefore using solder, steel, or zinc coated steel, is
absolutely out of the question. |
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|
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Robert Baer
Guest
|
| Posted:
Mon May 16, 2005 8:35 am Post subject:
Re: Kelvin clips (was Re: In the Mkt for a HP Bench DMM) |
|
|
Watson A.Name - "Watt Sun, the Dark Remover" wrote:
| Quote: | "Robert Baer" <robertbaer@earthlink.net> wrote in message
news:nUFhe.1522$Ri4.404@newsread1.news.pas.earthlink.net...
DaveM wrote:
"Watson A.Name - "Watt Sun, the Dark Remover""
NOSPAM@dslextreme.com> wrote
in message news:118c2b6ip03r06a@corp.supernews.com...
"David DiGiacomo" <david@slack.com> wrote in message
news:1189i7orccci2ab@corp.supernews.com...
Hosfelt Electronics sells Mueller Kelvin clips for $7.50 each, item
#
52-75K. I guess they must be available from other Mueller
distributors
also. They have copper contacts.
--
David DiGiacomo, San Francisco, CA david@slack.com
Thanks. Last year I ordered some from either them or some other
similar
electronics distrib, and they said they were out of stock with no
date
for an ETA. So I cancelled. I think that the smaller dealers like
Hosfelt are ordering small quantities from another distrib and can't
possibly keep enough in stock, and neither can the distrib they're
ordering from. In other words, the supply can't possibly keep up
with
the demand. But it's not like we can't live without them.
I also ordered a couple sets of the Kelvin clips from Hosfelt some
time ago.
THey were out of stock at the time I ordered them, but I really
wanted thm,
so I let them stay on backorder. They finally arrived some months
later.
They are not high quality clips.. held together by a small rubber
band
that provides the "spring" tension. But they do work, and for the
price,
they are good enough, since I don't use them in a production
environment.
Seems to me that anyone could kludge some up by using (plastic)
clothespins, copper (sticky on one side) tape, and wire.
Quality would be at least as good.
Tinning the copper tape would make it less suceptable to oxidation
and easier to keep clean.
Or get "fancy" and use thin galvanized sheet metal cut into narrow
strips; bend to fit around each jaw, solder on the leads and then
epozy
the strips to the jaws.
The galvanic action between different metals makes the readings
inaccurate. Therefore using solder, steel, or zinc coated steel, is
absolutely out of the question.
So on one side, one is going from (say) copper to galvanized; the |
other side is the opposite; tends to cancel out.
The original "cheapie" is just as bad on the contacts; i just made
suggestions for a more robust QND set (no rubber bands).
Now if there is a source for gold plated shim stock or equivalent,
then at least the contacts would be better.
BUT.
*Somewhere* in the full circuit, the metal used WILL change from gold
to something else (maybe copper???).
Therefore the most expensive Kelvin clips have the !same! galvanic
and thermoelectric problems. |
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