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On Sat, Jun 16, 2018 at 03:27 am, David M wrote:

Search Ebay for Copper Via Rivets. They are available in several diameters
and lengths. You'll have to come up with your own method and tooling to

stake

them to the PCB, but shouldn't be difficult.
Small nails, small hole punch, etc. should to the trick. Yankee ingenuity
rules.

Cheers,
Dave M

On Fri, Jun 15, 2018 at 07:28 pm, lop pol wrote:

I would like to affordably put together the things needed to repair plated
through holes. Anyone have any thoughts? I'm asking because I dont want

to

buy this more than once. My pocket has not much room for mistakes right

now

and i seem to do a lot better asking here before buying. Thanks guys

Ok. That is what I will do. The rivets/eyelets are really cheap most under .25
cents a piece at Mouser. I have a bunch of different punches so I will figure
something out. Thanks for the input.

I'm sure everyone here has seen one of these. But I haven't. Is it some sort of hack of a digital scope? It looks mint (and cool).



I have no affiliation with the seller.

I would like to affordably put together the things needed to repair plated through holes. Anyone have any thoughts? I'm asking because I dont want to buy this more than onct setter"e. My pocket has not much room for mistakes right now and i seem to do a lot better asking here before buying. Thanks guys

From: "ebrucehunter via Groups.Io" <Brucekareen@...>
Sent: Jun 16, 2018 10:46 AM
To: [email protected]
Subject: Re: [TekScopes] Repairing plated through holes.


About 50 years ago I purchased an eyelet press from Kepco, a company that then sold printed circuit board materials. At the time they offered a variety of different diameter rivets, of different lengths, and in both copper and brass. The press came with a number of special tips needed for the different size rivets. I was later able to fabricate special tips to also set Vector, rivet-type terminals.


Unfortunately, as a previous contributor has remarked, these eyelets almost always eventually gave trouble if not carefully soldered to the foil on both sides. Even soldered eyelets sometimes gave trouble, probably because, as another has mentioned, you need a little space under the head for solder to properly flow.


In looking at the press, I saw something I had never noticed before. The press was made in Italy by United Shoe Machinery, the company that made eyeletting machinery for the shoe industry and the original developer of the pop-rivet.



Bruce, KG6OJI

On Fri, 15 Jun 2018 20:33:52 -0700, you wrote:

On Fri, Jun 15, 2018 at 08:17 pm, Mark Goldberg wrote:

Do a search for "eyelet plated through hole" and you will find eyelets
designed for that purpose. I do not know what kind of tooling they may

or

may not require. I have also used just a piece of wire bent through the
hole and onto the pads on two sides, but that is not the "official"

method.

Regards,

Mark

I see the eyelets on mouser are cheap. What im really wondering about is

the staking tool and which one to get.

You could likely make one. You'd need something for an anvil, could
easily be made from a 4mm or so rod, put a handle on it. The "hammer"
part could be made from an automatic center punch with a different
punch part. They're made to be removed. You'd want a design that
curled the end of the rivet over.

Note that eyelets work best if they are either solid copper, or tinned
copper. I'm not sure that any other variety would even accept solder.
Also, you may have to drill out the hole a bit if you are trying to
get the same inside diameter. A third (and slightly fatal) problem is
that I can't see any way to make this work on multi-layer boards.
Double sided is the most. It could hold down lifting foil on a single
sided board, also.

A little lathe work (if you have one) and it might just come together.

Harvey

Paul

The 3330B is a Voltage/Current Calibrator

-DC

manuals@...

On 6/16/2018 10:20 AM, Paul Amaranth wrote:

Are you sure about that model number? A fluke 330b comes up as a
clamp on hand held. Voltage standards were 332, 335, etc.

From the context I'm assuming you're talking about one of the

80 pound voltage standards.

There is a volt-nuts (metrology) subgroup on eevblog with discussions
on these along with some very knowledgeable people who can help. I
have a 332b, pretty amazing piece of equipment.

Get a manual and be extremetly careful when that thing is on if you
have the cover off. I think that inner cover can be at 1KV.

Paul

On Sat, Jun 16, 2018 at 09:57:22AM -0400, Artekmedia wrote:

Oliver

there is a Yahoo group "Fluke_DMM" . Not real active (compared to
Tektronix and HP groups) but worth a try. (Also spelling it FLUKE
instead of FLYKE helps :-))

-DC
manuals@...

On 6/16/2018 9:31 AM, oliver johnson via Groups.Io wrote:

I have a fluke 3330b , have no output . I am not sure where to post for a
fluke but i figured someone could point me in the correct direction for a
group that can help me , or if someone here knows anything about going
about fixing this voltage standard .

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

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






!DSPAM:5b25176616721668650994!

Oliver

there is a Yahoo group "Fluke_DMM" . Not real active (compared to
Tektronix and HP groups) but worth a try. (Also spelling it FLUKE
instead of FLYKE helps :-))

-DC
manuals@...

On 6/16/2018 9:31 AM, oliver johnson via Groups.Io wrote:

I have a fluke 3330b , have no output . I am not sure where to post for a
fluke but i figured someone could point me in the correct direction for a
group that can help me , or if someone? here knows anything about going
about fixing this voltage standard .

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






!DSPAM:5b25107313919973180691!

Are you sure about that model number? A fluke 330b comes up as a
clamp on hand held. Voltage standards were 332, 335, etc.

From the context I'm assuming you're talking about one of the

80 pound voltage standards.

There is a volt-nuts (metrology) subgroup on eevblog with discussions
on these along with some very knowledgeable people who can help. I
have a 332b, pretty amazing piece of equipment.

Get a manual and be extremetly careful when that thing is on if you
have the cover off. I think that inner cover can be at 1KV.

Paul

On Sat, Jun 16, 2018 at 09:57:22AM -0400, Artekmedia wrote:

Oliver

there is a Yahoo group "Fluke_DMM" . Not real active (compared to
Tektronix and HP groups) but worth a try. (Also spelling it FLUKE
instead of FLYKE helps :-))

-DC
manuals@...

On 6/16/2018 9:31 AM, oliver johnson via Groups.Io wrote:

I have a fluke 3330b , have no output . I am not sure where to post for a
fluke but i figured someone could point me in the correct direction for a
group that can help me , or if someone here knows anything about going
about fixing this voltage standard .

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






!DSPAM:5b25107313919973180691!

From: Artekmedia <manuals@...>

Oliver

there is a Yahoo group "Fluke_DMM" . Not real active (compared to
Tektronix and HP groups) but worth a try. (Also spelling it FLUKE
instead of FLYKE helps :-))

-DC
manuals@...

On 6/16/2018 9:31 AM, Oliver Johnson via Groups.Io wrote:

I have a fluke 3330b , have no output . I am not sure where to post for a Fluke but i figured someone could point me in the correct direction for a group that can help me , or if someone here knows anything about going about fixing this voltage standard.

Oliver

there is a Yahoo group "Fluke_DMM" . Not real active (compared to
Tektronix and HP groups) but worth a try. (Also spelling it FLUKE
instead of FLYKE helps :-))

-DC
manuals@...

On 6/16/2018 9:31 AM, oliver johnson via Groups.Io wrote:

I have a fluke 3330b , have no output . I am not sure where to post for a
fluke but i figured someone could point me in the correct direction for a
group that can help me , or if someone here knows anything about going
about fixing this voltage standard .

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






!DSPAM:5b25107313919973180691!

I have a fluke 3330b , have no output . I am not sure where to post for a fluke but i figured someone could point me in the correct direction for a group that can help me , or if someone? here knows anything about going about fixing this voltage standard .

I have a fluke 3330b , have no output . I am not sure where to post for a fluke but i figured someone could point me in the correct direction for a group that can help me , or if someone here knows anything about going about fixing this voltage standard .

Hi Keith,

Obviously my suggestions are too cryptically for you. I hesitate to
continue since in my opinion you should understand the purpose of test
measurements, to learn something and also to protect the equipment and
yourself from damage. But let me try to clarify my previous suggestions.
Q1418 is the heart of the oscillator. Oscillation occurs because of the
feedback from collector to base provided by the windings 6-7 and 8-9 of
the transformer. The voltage and current amplitude in these windings is
determined by average base current which has to come from the regulator
circuit, Q1416 emitter. The oscillator produces an up-transformed
alternating voltage in the HV winding between pins 23 and 5 which is
half-wave rectified by CR1421 to give a negative HV at C1421 to C1424 and
CRT cathode.
A fault could be that one of these HV caps (or even C1488) starts to leak
at say 70 V. That would put extra load on the oscillator in its start-up
phase and and prevent the amplitude to rise further.
Another fault could be that CR1421 starts to leak, with the same
consequence.
Both these fault would show up of you externally feed TP1423 with a high
enough negative voltage (scope disconnected from the power inlet of
course). I simply use my 576? curve tracer for this purpose but you have
to improvise something. A DC supply, preferably variable, would be needed,
with + to scope ground and – to TP via a DMM. The DMM at say 200 V DC
range. The DMM is 10 M (usually), the load on TP is about 30 M. So the DMM
reading should be about 25% of the supply voltage and maintain that
percentage when the supply voltage is increased. When the percentage
starts to increase it indicates leakage somewhere, and you can also try to
estimate how heavy that leakage is.
Of course this would eliminate only a leakage fault in the branch from
CR1421.
A fault in the branche from pin 3 is not very likely, it’s low voltage.
That leaves a fault in the transformer itself (any winding could be
involved) or in the HV multiplier.

Suppose you disconnect P1400. Then you can supply an AC voltage across the
collector winding between pin 1 of P1400 socket and the fuse holder
terminal. I use a sine wave function generator for this. The generator
output is w.r.t. generator ground, so I connect that side to the fuse and
the live side to mentioned pin 1. (Additionally the fuse side can be
shorted to scope ground to prevent any floating voltage levels inside the
scope.) Some people use an audio amplifier.
This way I can control the input frequency an voltage amplitude. I also
monitor the generator output current and the TP voltage. With all this
information I can check that the resonance frequency is about what it
should be (maybe 50 kHz for a 465? I didn’t look it up) and also see if
stange things happen if I increase the amplitude.

L1419 and C1418/C1419 mainly serve to prevent oscillator signals to enter
15 V elsewhere. I think that even without these C’s the oscillator should
still work.

Albert

On Fri, Jun 15, 2018 at 05:50 pm, Keith Ostertag wrote:

Thanks for your continued help Albert. I _might_ be able to cobble

together a

power supply in excess of 100V... but I am not understanding what that

will

tell me, possibly because I am unsure of your use for the term leakage

in this

context. Since TP1486 is in the secondary side of T1420 (correct?) how

can

anything I do with it eliminate T1420 as a fault? For instance if

T1420's

primary (inline with Q1418) is shorted or partially shorted? At least

that 's

the question that comes to my mind, since I don't understand the

circuit. What

if L1419 is shorted or partially shorted? And how does that eliminate

(or

indicate) the HV multiplier as the fault?

Let's see... you are suggesting that I might "drive the collector

winding from

an external source" by adding a negative voltage to TP1486 (which is

connected

to the T1420's secondary), is that correct? So if I had a +200VDC power

supply

I would connect the +200V positive terminal to ground and the negative
terminal to TP1486?

In the case I could obtain an power supply, where exactly would I

measure the

leakage current and what level would be the pass/fail amount? I assume

you

mean replace the fuse F1419 with an ammeter as I did before in order to
measure Q1418's collector current?

My only guess is... by adding voltage to the secondary, a working

primary must

likewise increase, thus increasing the collector current. So... if it

does not

increase Q1418's collector current then that suggests a problem with

L1419 or

T1420 (or C1419)?

And if that is close to being correct as a strategy, then wouldn't

slightly

increasing the positive voltage at the fuse test it similarly? I say

that

assuming T1420's secondary is unlikely to have been damaged by anything

I

might have shorted in front of it...

Oops... rereading your message I see:"Then you could see at which

frequency it

resonates and how it responds to increasing primary amplitude.", which I

somehow missed in the above...

Let me start over... Q1418's circuit drives the signal taken from Q1416
through T1420, multiplying it by whatever the turns ratio of T1420 is.

You are

suggesting I unplug Q1418 and replace it with a short? Then read the

current

through F1419? Not sure how we are to read a resonate frequency when we

are

not applying a sweep... Sorry, as you can see this is a bit over my

head...