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Not sure what happened as my post that was sent in by email apears to be missing the body text. I am replying to myself to send in the missing text. Sorry if I am in some way doing it wrong.

=== Original Message ===

Hi, I am new to this group here at IO, and was redirected from the former Yahoo HP group where I used to be a member a long time ago.

I just recently acquired a nice 5022A TTL/CMOS Troubleshooting Kit which includes one each of the 545A Logic probe, 546A Logic Pulser, and 547A current probe, all in a nice HP pouch, and everything in very good condition given age, and fully operational. Originally this kit also included the 548A logic clip, but this specific bundle I purchased did not, so in the mean time I managed to get one clip separately to make it complete once again.

The kit also included all the grabber clips that go on the power cables, plus two spares. But one thing I am still missing is the Ground Clip cable, which can be plugged into either the 545A or 546A in order to achieve a shorter ground path connection. This cable has the typical grabber on one end, and on the other has a kind of sleeve that would slip over a connector on the probe that is basically just a rather small diameter pin recessed inside the body of the probe.

I assume that probably the easiest solution would be to just try to build a new cable from scratch, and already having the grabber, that only leaves me to find something suitable to use at the other end. My question would be if someone here has already attempted to build such a cable and if so which type of sleeve connector did they use (or would recommend - maybe a Mouser or Digikey PN would be nice). If nothing else I would have to start looking at those places myself and eventually try to find something that might fit, but I was hoping this has already been done and a working part has been found.

Also, if by any chance anyone here in this group might have one of these Ground Clip Cables for sale (HP Part No. 00545-60105), even if in used (but in decent condition), even if it is missing the grabber side. Of course it goes without saying that a NOS cable would even be better. Either way I would definitively be interested. I already checked the e-pay place and set up a search just in case anything comes up, but I doubt someone would sell one of these cables separately. Also did various Google searches which only brought up links to older HP catalogs from the 80s where the part number of the cable is listed as an included accesory to the 545/546 probes. I could also send in a small picture of the ground clip wire if that would be of any help.

Hope the combined knowledge of this group can help me. Thanks for any leads (pun intended). Hope everyone is having a nice weekend.

Alex

On Sun, 26 Aug 2018 11:32:11 -0700, you wrote:

Not sure what happened as my post that was sent in by email apears to be missing the body text. I am replying to myself to send in the missing text. Sorry if I am in some way doing it wrong.

=== Original Message ===

Hi, I am new to this group here at IO, and was redirected from the former Yahoo HP group where I used to be a member a long time ago.

I just recently acquired a nice 5022A TTL/CMOS Troubleshooting Kit which includes one each of the 545A Logic probe, 546A Logic Pulser, and 547A current probe, all in a nice HP pouch, and everything in very good condition given age, and fully operational. Originally this kit also included the 548A logic clip, but this specific bundle I purchased did not, so in the mean time I managed to get one clip separately to make it complete once again.

I've got them. You'll find that the current probe is the least used,
but the most valuable of the parts. VERY useful in finding a shorted
signal line, just keep it active and look for the largest current
flow.

The kit also included all the grabber clips that go on the power cables, plus two spares. But one thing I am still missing is the Ground Clip cable, which can be plugged into either the 545A or 546A in order to achieve a shorter ground path connection. This cable has the typical grabber on one end, and on the other has a kind of sleeve that would slip over a connector on the probe that is basically just a rather small diameter pin recessed inside the body of the probe.

Yep.

I assume that probably the easiest solution would be to just try to build a new cable from scratch, and already having the grabber, that only leaves me to find something suitable to use at the other end. My question would be if someone here has already attempted to build such a cable and if so which type of sleeve connector did they use (or would recommend - maybe a Mouser or Digikey PN would be nice). If nothing else I would have to start looking at those places myself and eventually try to find something that might fit, but I was hoping this has already been done and a working part has been found.

You'll like this one. May not be the absolute best, but give it a
try.

Using one of the 0.025 inch square pin jumpers (available relatively
inexpensively on the internet and useful anyway, I could suggest
amazon.com), you want one that has at least one socket on it,
depending on what you want to do to the other end.

Remove the plastic square header, won't fit.

Take a thin piece of heatshrink and cover the exposed pin.

It fits over the ground pin, not sure how deeply, but it will work.

Advantage here is that by using F-F you can likely use a grabber. By
using M-F you can plug it into a breadboard strip.

Harvey

Also, if by any chance anyone here in this group might have one of these Ground Clip Cables for sale (HP Part No. 00545-60105), even if in used (but in decent condition), even if it is missing the grabber side. Of course it goes without saying that a NOS cable would even be better. Either way I would definitively be interested. I already checked the e-pay place and set up a search just in case anything comes up, but I doubt someone would sell one of these cables separately. Also did various Google searches which only brought up links to older HP catalogs from the 80s where the part number of the cable is listed as an included accesory to the 545/546 probes. I could also send in a small picture of the ground clip wire if that would be of any help.

Hope the combined knowledge of this group can help me. Thanks for any leads (pun intended). Hope everyone is having a nice weekend.

Alex

I'm with Harvey on this one. Use can use the pulser probe or a function
generator to feed the circuit while you use the current probe to follow
the current around the board to the short. Generally it takes me longer
to hook everything up than to actually find the short.

Fantastic for finding bad tants across power rails.

Paul

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows

On Sun, 26 Aug 2018 17:37:11 -0400, you wrote:

I'm with Harvey on this one. Use can use the pulser probe or a function
generator to feed the circuit while you use the current probe to follow
the current around the board to the short. Generally it takes me longer
to hook everything up than to actually find the short.

Short story was that I had a design with an S1D13781 graphics
controller chip on an SPI interface, and used that interface for more
than one chip. Other chip didn't work.

put the processor in a "read back" loop for SPI and the other chip
(since the graphics were fine). Traced the signal back to the
graphics chip:

Quote the manual: "The S1D13781 chip holds the MISO line low when not
selected...."

Oh...

Not like that made any sense

Add a 1G126 or 1G125 so that when CS is down, the MISO line out is
active, otherwise tristated.

reasonably quick solution to problem.

Still doesn't make any sense to do that. All subsequent designs have
that gate in automatically.

"We don't need no stinkin' standards....."

Harvey

Fantastic for finding bad tants across power rails.

Paul

On Sun, Aug 26, 2018 at 04:10:08PM -0400, Harvey White wrote:

On Sun, 26 Aug 2018 11:32:11 -0700, you wrote:

Not sure what happened as my post that was sent in by email apears to be missing the body text. I am replying to myself to send in the missing text. Sorry if I am in some way doing it wrong.

=== Original Message ===

Hi, I am new to this group here at IO, and was redirected from the former Yahoo HP group where I used to be a member a long time ago.

I just recently acquired a nice 5022A TTL/CMOS Troubleshooting Kit which includes one each of the 545A Logic probe, 546A Logic Pulser, and 547A current probe, all in a nice HP pouch, and everything in very good condition given age, and fully operational. Originally this kit also included the 548A logic clip, but this specific bundle I purchased did not, so in the mean time I managed to get one clip separately to make it complete once again.

I've got them. You'll find that the current probe is the least used,
but the most valuable of the parts. VERY useful in finding a shorted
signal line, just keep it active and look for the largest current
flow.

On Sun, Aug 26, 2018 at 01:10 PM, Harvey White wrote:

You'll like this one. May not be the absolute best, but give it a
try.

Using one of the 0.025 inch square pin jumpers (available relatively
inexpensively on the internet and useful anyway, I could suggest
amazon.com), you want one that has at least one socket on it,
depending on what you want to do to the other end.

Remove the plastic square header, won't fit.

Take a thin piece of heatshrink and cover the exposed pin.

It fits over the ground pin, not sure how deeply, but it will work.

Advantage here is that by using F-F you can likely use a grabber. By
using M-F you can plug it into a breadboard strip.

Hi Harvey, your idea sounds like going in the right direction. I have not yet done any searches on the jumper cables you mention on Amazon (I assume they are probably also available on ebay which usually has free shipping on small stuff), but wanted to ask if you by any chance have a part number or reference to these jumper cables? This being kind of critical size, and I can imagine that out there are more than one size jumpers like these, if by any chance you have this additional info it would be great. Otherwise I'll just start picking up the trail on your tip. Thanks!

Harvey, would this be something similar to what you are suggesting? Looks like it, if only I did not need to buy 90 pcs it would be perfect. But I'll settle for 10 if need be, 90 is a bit much. I'll keep searching.



I hope its ok to publish e-pay links here...

On Sun, 26 Aug 2018 16:13:07 -0700, you wrote:

On Sun, Aug 26, 2018 at 01:10 PM, Harvey White wrote:

You'll like this one. May not be the absolute best, but give it a
try.

Using one of the 0.025 inch square pin jumpers (available relatively
inexpensively on the internet and useful anyway, I could suggest
amazon.com), you want one that has at least one socket on it,
depending on what you want to do to the other end.

Remove the plastic square header, won't fit.

Take a thin piece of heatshrink and cover the exposed pin.

It fits over the ground pin, not sure how deeply, but it will work.

Advantage here is that by using F-F you can likely use a grabber. By
using M-F you can plug it into a breadboard strip.

Hi Harvey, your idea sounds like going in the right direction. I have not yet done any searches on the jumper cables you mention on Amazon (I assume they are probably also available on ebay which usually has free shipping on small stuff), but wanted to ask if you by any chance have a part number or reference to these jumper cables? This being kind of critical size, and I can imagine that out there are more than one size jumpers like these, if by any chance you have this additional info it would be great. Otherwise I'll just start picking up the trail on your tip. Thanks!

Actually, there *is* no part number. These are the generic chinese
made jumper made jumpers. These are about 6 inches long. They can be
had in either M-M, M-F, and F-F varieties. You simply pull them apart
on one line. I'll show you the amazon link (and there are many
vendors)


Prototype-Assortment-Raspberry/dp/B077X7MKHN/ref=sr_1_17?ie=UTF8&qid=1535327428&sr=8-17&keywords=breadboard+jumper+wires


This is a vendor I have ordered from before with decent results. Note
that you're mostly interested in the M-F and perhaps the F-F ones.

Amazon has free shipping if you order more than a certain amount.
Depends on what you want. Feel free to ask me outside the group, but
I have ordered several kinds of things useful for microprocessor
designs from amazon, and I may be able to help.

I don't count the length as critical, you could always cut and splice
as needed.

Harvey

On Sun, 26 Aug 2018 16:19:22 -0700, you wrote:

Harvey, would this be something similar to what you are suggesting? Looks like it, if only I did not need to buy 90 pcs it would be perfect. But I'll settle for 10 if need be, 90 is a bit much. I'll keep searching.



I hope its ok to publish e-pay links here...

Yes, that's about right, but the "rare" is not deserved. My previous
post points you at the generic stuff.

Harvey

Michael A. TerrellThere are a lot of cheaper listings than that one from the infamous Don Lancaster.

I buy the female to female 40 conductor ribbons, and use them to make wiring harnesses for test fixtures and prototypes. The different sizes of Dupont housings sell for pennies each, by the hundred. A small screwdriver or the tip of a small Exacto blade allow you to remove the single housings, and then to pop them into the larger housing that you need.

<>

Michael Terrell
--

On Sun, Aug 26, 2018 at 04:54 PM, Harvey White wrote:

This is a vendor I have ordered from before with decent results. Note
that you're mostly interested in the M-F and perhaps the F-F ones.

F-F would be perfect, the grabbers also have the same pin receptacle as the probe.

Amazon has free shipping if you order more than a certain amount.

Yes but one would have to order over $25 for it to qualify for free shipping, and that's a whole lot of jumpers. Thanks for the link, we are now definitively on the same page, that was very helpful -thank you Harvey. Still going to try and find these same jumpers on ebay, over there even very small orders have usually free shipping, or a buck or two at most, specially the chinese generic stuff. Anyway, just my experience over time, and not to defend the e-pay place, but that is why I rarely even consider ordering anything on Amazon anymore.

Ok just ordered these:
1X-40PCS-Dupont-Wire-Jumper-Cable-10cm-2-54MM-Female-to-Female-1P-1P-For-Arduino

$2.75 and free In-US shipping

I think these don't have to be cut to remove the header. Don't they have kind of a small hook on one side that keeps the connector from sliding out? If so its just a matter of pressing on this hook and the connector should come out easily.

It is a small tab that you need to lift until it unlatches.

Michael A. Terrell
--

On Sun, Aug 26, 2018 at 01:10 PM, Harvey White wrote:

I just recently acquired a nice 5022A TTL/CMOS Troubleshooting Kit which includes one each of the 545A Logic probe, 546A Logic Pulser, and 547A current probe, all in a nice HP pouch, and everything in very good condition given age, and fully operational. Originally this kit also included the 548A logic clip, but this specific bundle I purchased did not, so in the mean time I managed to get one clip separately to make it complete once again.

I've got them. You'll find that the current probe is the least used,
but the most valuable of the parts. VERY useful in finding a shorted
signal line, just keep it active and look for the largest current
flow.

I had actually been looking for a while mainly for a current probe and pulser as I wanted to locate a short on a PCB without having to cut traces or lifting SMD stuff. Was checking e-pay regularly for a couple of months and saw several rare very nice full probe sets go for $300-$400, which given this set was about $900 new when it was sold in the early 80s, was still a decent price. And given that even the individual logic/pulser probes usually go for more than $100 each (the current probe for even more -if you can even find one) I figured it would make sense to get the full set and wait for a good chance. Then one morning spotted a seller in Germany offering an almost full set (only missing the 548A logic clip) for the equivalent of $175 BIN and about $12 shipping with tracking so immediately went for it. And a week later got the logic clip for $40 from a US seller. All in all I am happy with the deals.

And about that short I needed to find, since the PCB was really very small (from a compact 2-way portable radio) I was not able to pin down the shorted part (a 10uF Tantalum SMD cap), but the current probe certainly helped to at least exclude other suspect parts also being fed power on the same buss. Also problem seems in these cases that a capacitor above a certain size actually behaves as a short for a very short time until it charges, so I was getting some false readings from good caps as well.

On Sun, Aug 26, 2018 at 07:42 PM, Michael A. Terrell wrote:

It is a small tab that you need to lift until it unlatches.

Yes, that is what I meant, but if I am not mistaken I think the tab needs to be pushed in slightly to be able to slide past the latching point inside the housing? Thanks Michael.

On 08/26/2018 11:09 PM, Alex wrote:

Also problem seems in these cases that a
capacitor above a certain size actually behaves as a short for a very
short time until it charges, so I was getting some false readings from
good caps as well.

Not capacitors above a certain size, but *all* capacitors.

In fact, all capacitANCES, whether you're looking at an actual
capacitor or not.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA

All that I've ever seen had to be lifted, not pushed in. That damages the tab on the pin. Here is a closeup image of the single pin housing:



I think you are confusing these with Molex or AMP housings.

Michael A. Terrell

--

On Sun, 26 Aug 2018 19:08:35 -0700, you wrote:

My wife is constantly ordering books from them, so we get over the
minimum rather easily. Some vendors offer free shipping, you just
need to see what the category is. One or two TFT displays of the
right type, or 40 or 50 connectors, and you're in.

I do tend to stock up.

I could just as easily put a few in an envelope and send them to you
if you need it.

Harvey

On Sun, Aug 26, 2018 at 04:54 PM, Harvey White wrote:

This is a vendor I have ordered from before with decent results. Note
that you're mostly interested in the M-F and perhaps the F-F ones.

F-F would be perfect, the grabbers also have the same pin receptacle as the probe.

Amazon has free shipping if you order more than a certain amount.

Yes but one would have to order over $25 for it to qualify for free shipping, and that's a whole lot of jumpers. Thanks for the link, we are now definitively on the same page, that was very helpful -thank you Harvey. Still going to try and find these same jumpers on ebay, over there even very small orders have usually free shipping, or a buck or two at most, specially the chinese generic stuff. Anyway, just my experience over time, and not to defend the e-pay place, but that is why I rarely even consider ordering anything on Amazon anymore.

On Sun, 26 Aug 2018 19:22:25 -0700, you wrote:

Ok just ordered these:
1X-40PCS-Dupont-Wire-Jumper-Cable-10cm-2-54MM-Female-to-Female-1P-1P-For-Arduino

$2.75 and free In-US shipping

I think these don't have to be cut to remove the header. Don't they have kind of a small hook on one side that keeps the connector from sliding out? If so its just a matter of pressing on this hook and the connector should come out easily.

There's a small tab that you need to lever out a bit, then the
connector just pulls out.

Looking carefully at one will show you how.

Harvey