Re: Recommendation for desoldering iron/system?
I have used Pace desoldering equipment since the 90's and wouldn't have anything else. I use the self contained and no air supply needed. Once you figure out how to maintain it all is well. I used solder suckers and chipquik before that and there is no comparison.
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Re: Looking For HP3478A Front Foot
I found a foot from one of the gentleman below.? Thanks to all.? --
Bill Ripley, KY5Q
Embedded Systems Consultant, ARRL Instructor, STEM School Volunteer
Email:?KY5Q@...?| Alt Email:?Bill.Ripley@...
STEM Website??(About or Blog tabs)
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Re: Recommendation for desoldering iron/system?
I bought an Aoyue 474A++ that I have been unhappy with (link below).? Not enough suction to properly de-solder anything.? Honestly, I've nothing better than a good supply of braid and a bottle of good flux with a needle top.? Since I learned how to do it properly, I've never screwed up a board with solder braid.? I cant say the same for the vacuum pump based desoldering stations.? --
Bill Ripley, KY5Q
Embedded Systems Consultant, ARRL Instructor, STEM School Volunteer
Email:?KY5Q@...?| Alt Email:?Bill.Ripley@...
STEM Website??(About or Blog tabs)
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Re: Generic but decent quality test leads for 3478 DMM
On 2020-03-30, at 02:11, Don Lewis <dlewis6767@...> wrote:
If those are the types' with the tip insert that 'spins', they are worthless. ?
They become intermittent/ high resistance constantly.
The cage-type banana plugs can be done right or in the wrong way.Cheap Chinese plugs usually are done with a somewhat randomly sized cage, so there is likely to be intermittent contact (the cages still spin around the core even when the whole thing is plugged in to a socket).The items I have obtained so far(*) from the listing I linked to below, are done right, i.e., the compression of the cage by inserting the plug into a socket makes sure there is reliable contact.Quality is directly proportional to cost.
Actually, no. ?(Well, maybe to cost, but certainly not to price.)Grü?e, Carsten(*) Can’t vouch for them of course — they could always change the supplier. ?But so can anybody else...
Don N5CID
-----------------------------------------------------------------------------------------------------
On 3/29/2020 2:03 PM, Carsten Bormann wrote:
Always keep a couple of these in your pocket:
Grü?e, Carsten
On 2020-03-29, at 20:53, Jeff AC0C <keepwalking188@...> wrote:
Curious for recommendations on some decent quality test leads for use with a 3478 DMM.
The 3478 has a recessed jack and the hooded type leads off a Fluke, etc, won't work. ?Normally I use a banana end/clip other end combo for these but from time to time I need to use a conventional hand-held test lead with a sharp pointed end.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
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Re: Generic but decent quality test leads for 3478 DMM
I went through a long and frustrating exercise to find some decent leads.? I bought these I bought 2 sets, and one lead needed resoldering.? The supplier cheerfully just sent me another set after I supplied photo.? Otherwise, I love the leads. These are more conventional leads.? They have been fine for me, and are of good quality. I went through a huge search for banana plugs at a price I was willing to pay.? As regards to the ones in your link, do they solder at the bottom of the plug?? I was trying to find some that did not have the screw on the side, and that look like they will hold up.? I found some crazy ones out there, some of which had metal shells that were at the same potential as the plug.? Color me crazy, but that sounds like a poor idea. Rip
Bill Ripley, KY5Q
Embedded Systems Consultant, ARRL Instructor, STEM School Volunteer
Email:?KY5Q@...?| Alt Email:?Bill.Ripley@...
STEM Website??(About or Blog tabs)
|
?
Thanks Joel.
?
Ordered a new connector and inserts, connector was
burnt!
?
Kevin
---- Original Message -----
Sent: Sunday, March 29, 2020 5:00
PM
Subject: Re:
[HP-Agilent-Keysight-equipment] 1740A problem
Hi Kevin,
I had the exact same problem with the flood
gun, and found that the connector which connects the power transformer with
rectifier CR3 on the power supply board was burned by overheating. I replaced
the connector with one having square, gold-plated pins, and the problem has
never returned.
There seems to be several different implementations of
the flood-gun supply, which would indicate that HP experienced many failures
with this circuit and didn't find the right solution after the first
try...? There were also many overheating problems with the secondary
connections of the power transformer. Replacing the round pins with square
ones provides a much lower contact resistance, and goes a long way in solving
this problem. Just make sure you replace the connector before anything burns
...
And have fun !
Joel
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Re: Maximum depth of HP rack mountable gear?
On Sun, Mar 29, 2020 at 02:05 PM, Leo Kroonenburg wrote:
Maybe the rack was originally for HP computer systems, they had deeper SCSI storage cabinets.
An anecdote: The last few years of my career with HP/HPE Storage, I was the EE for a SAS-3 JBOD shelf. The main PCB is primarily a SAS expander chip with SAS etch going to the front of the box for the drives, and to the back of the box for the SAS cable connectors. The folks who decide the "physical" aspects of the product insisted that the box had to be rather deep, so that when mounted in a rack with servers, it would be a similar depth, for ease of access to the SAS connectors and such. But that Requirement meant that the main PCB had to be quite long, creating signal integrity issues. As a result, we had to use an expensive PCB material that added significant cost to the box. Nobody (of importance) wanted to consider different cable design or chassis design options that would have allowed a shorter board. Pete
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Re: Maximum depth of HP rack mountable gear?
It is, but it's worth noting that the 8566B RF section with it's tumor fan module is exactly the same depth (I have my 66B stacked on the 8672A).
They are all heavy, but the 8664A is the king of single unit weight in my lab, followed closely by my vintage 693B sweeper (which has two massive transformers, a backwards wave oscillator, and tons of vacuum tubes). I think the 8664A isn't necessarily much heavier, but it's extremely bulky due to it's depth and 6U height.
Sean
toggle quoted message
Show quoted text
On Sun, Mar 29, 2020 at 06:48 PM, Jim Ford wrote:
IIRC, that 8672A is pretty deep, too.? About 5 years ago when my buddy sold me an 8566 spec an, he lent me an 8672 as well to give the 8566 something to look at.? He would have sold the 8672 for $600, and I would have bought it but it was too deep for my bench.? Weighs close to a ton, too!? Got an 8350B sweeper and some other nice microwave stuff for $750 since then from a company going out of business.? Next up, 8510C!
?
Just saw some full-size racks in the dumpster at work.? I'd have tried to take one off their hands, but they were very deep, appearing to be about 3 feet.? No way I could fit that in my garage.? I just checked, and I have 28 inches absolute maximum from the wall to my existing bench.? I have the (dis)advantage of having a cubicle at work by the window on the 2nd floor, just above the dumpster!? They did have some server racks going to the scrapper a few weeks ago, but I think they would have bent up into a Frank Gehry building (look him up if you want to see some ugly, ugly architecture) if I'd put my 112 pound 8566 or other heavy microwave gear in one of them!? That's how I console myself anyway...
?
Jim Ford
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Re: Maximum depth of HP rack mountable gear?
Thanks all!
I managed to find a manual for my 'new' second-hand rack (an NEC brand one), all in Japanese, but it appears there is an extension on the back of sorts that acts as a cable-way and place for PDU's etc.
Due to the modular meccano nature of this rack, I think I can simply unbolt that extension to reduce the length by, I guess, 150-200mm or so.
That should give me a total depth of about 800mm.
When taking into account internal space at the front and rear from the rack posts to the insides of the doors being maybe a bit under 100mm, it should be a good fit for maybe even the longest bits if gear.
I'll have to wait to make adjustments and final measurements once I pick up the rack later this week.
There will most certainly be liberal use of shelves and rear supports. I work in server racks all day for my day job and know all about the need for supporting saggy bits of expensive equipment! :)
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HP-3562A PSU Schematic - Dead PSU
All:
I am going through a HP 3562A Dynamic Signal Analyzer. Many years ago this was thrusted upon me by a former employer, with the threat of it going to the dumpster if I did not take it. The unit actually looks to be in excellent condition, so I thought I would at least take a stab at it.
At this time the Analyzer is completely dead. I suspect the issue is a PSU Fault. I have looked online for a reasonable schematic, and I am not finding a suitable service manual. The ones I have found online, the schematics are incomplete, or half missing.
At the moment the PSU Board (A18) is giving me a TTL High on OTEMP and PWRDN, while giving showing a TTL Low on the PWRUP test point. I suspect fault monitoring has caused the above indication, but the schematics I have been able to locate do not show enough detail to understand exactly where to start looking.
Thanks in advance!
Rich
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Re: WANTED - "RING LOCK" from HP 8484A power sensor (HP part number 08484-20019, ref designation MP6
Dave,?
PM me… .
Pete wa2odo?
On Sun, Mar 29, 2020, 9:51 PM David Feldman via Groups.Io <wb0gaz= [email protected]> wrote: Still (still) looking for the part - even a dead 8484A would suffice.
Thanks,
Dave
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Re: WANTED - "RING LOCK" from HP 8484A power sensor (HP part number 08484-20019, ref designation MP6
Still (still) looking for the part - even a dead 8484A would suffice.
Thanks,
Dave
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Re: Maximum depth of HP rack mountable gear?
IIRC, that 8672A is pretty deep, too.? About 5 years ago when my buddy sold me an 8566 spec an, he lent me an 8672 as well to give the 8566 something to look at.? He would have sold the 8672 for $600, and I would have bought it but it was too deep for my bench.? Weighs close to a ton, too!? Got an 8350B sweeper and some other nice microwave stuff for $750 since then from a company going out of business.? Next up, 8510C!
Just saw some full-size racks in the dumpster at work.? I'd have tried to take one off their hands, but they were very deep, appearing to be about 3 feet.? No way I could fit that in my garage.? I just checked, and I have 28 inches absolute maximum from the wall to my existing bench.? I have the (dis)advantage of having a cubicle at work by the window on the 2nd floor, just above the dumpster!? They did have some server racks going to the scrapper a few weeks ago, but I think they would have bent up into a Frank Gehry building (look him up if you want to see some ugly, ugly architecture) if I'd put my 112 pound 8566 or other heavy microwave gear in one of them!? That's how I console myself anyway...
Jim Ford
------ Original Message ------
Sent: 3/29/2020 5:51:07 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Maximum depth of HP rack mountable gear?
8664A sig gen, all of 27 inches including bumper feet and rack handles. Mine has the RF tight case option too...it's a real bear to handle because there's no side strap handle like my 8672A has.
Sean
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Re: Generic but decent quality test leads for 3478 DMM
On Sun, Mar 29, 2020 at 06:01 PM, Jeff AC0C wrote:
What model do you have?? I see they make a zillion variations.
Jeff, 8018S, which is the retractable shroud version. Make sure you read the numbers carefully before adding to your cart; a couple models have banana jacks that are designed for Simpson 260 series VOMs and will not fit properly in a standard binding post. Sean
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Re: Generic but decent quality test leads for 3478 DMM
Sean,
What model do you have?? I see they make a zillion variations.
73/jeff/ac0c
alpha-charlie-zero-charlie
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Show quoted text
Jim,
I would rate them as the best DMM test leads I have. They have a
lot of nice screw on tip accessories too...won't fall off on you
(looking at you Fluke). Definitely worth a look.
I'm also thinking of getting a pair of their passive oscilloscope
probe kits for my 1727A storage 'scope.
Good company.
Sean
On Sun, Mar 29, 2020 at 05:29 PM, Jim Ford wrote:
Hey, if you can't seriously injure yourself by misusing
them, they aren't sharp enough!? Gotta be able to poke through
those oxides, flux residue, etc.? Not to mention high enough
spatial resolution not to short out a bunch of pads at once.
?
I bet those are better than the Pomona Electronics ones I
recommended, because of the silicone leads on the Probemaster
ones.? Thanks, Sean.? Won't melt if you hit 'em with a
soldering iron.? Why no, I've never done that before; why do
you ask? ;)
?
Jim Ford
|
Re: Maximum depth of HP rack mountable gear?
8664A sig gen, all of 27 inches including bumper feet and rack handles. Mine has the RF tight case option too...it's a real bear to handle because there's no side strap handle like my 8672A has.
Sean
|
Re: Generic but decent quality test leads for 3478 DMM
Jim,
I would rate them as the best DMM test leads I have. They have a lot of nice screw on tip accessories too...won't fall off on you (looking at you Fluke). Definitely worth a look.
I'm also thinking of getting a pair of their passive oscilloscope probe kits for my 1727A storage 'scope.
Good company.
Sean
toggle quoted message
Show quoted text
On Sun, Mar 29, 2020 at 05:29 PM, Jim Ford wrote:
Hey, if you can't seriously injure yourself by misusing them, they aren't sharp enough!? Gotta be able to poke through those oxides, flux residue, etc.? Not to mention high enough spatial resolution not to short out a bunch of pads at once.
?
I bet those are better than the Pomona Electronics ones I recommended, because of the silicone leads on the Probemaster ones.? Thanks, Sean.? Won't melt if you hit 'em with a soldering iron.? Why no, I've never done that before; why do you ask? ;)
?
Jim Ford
|
Re: Maximum depth of HP rack mountable gear?
I’ve got an HP 4274A that measures 574mm – not sure that it is intended for rack mounting though. ? Kerry ? ? ? So I just purchased a second hand 25U rack to start stacking all the gear I keep buying, but this rack is about a meter deep..
Most of my gear isn't near that deep, so I was wondering if anyone here knows the longest chassis used in the 80's type HP rack mountable enclosures?
The longest I have currently is almost 600mm for my 4145A, is there anything longer than that?
I plan to cut the depth of this rack down to save space in the lab, but I don't want to cut it too short for my future impulse purchases on the usual auction sites. :)
Thanks!
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Re: Equipment identification
Mark,
You nailed it. The meters were HP? HP 413AR DC Null Voltmeters.
I attach the image, not perfect but good enough.
Thank you all who responded.
Ignacio, EB4APL
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Show quoted text
El 30/03/2020 a las 0:58, Mark Fort escribió: Looks to me like the old USB (Unified S Band) consoles at NASA MSFN (Manned Space Flight Network) ground stations during the Apollo days.
And from memory the prominent analogue meters were not HP - they may have been task specific. It is getting on to 50 years ago so my memory is not crystal clear on this point.
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Richard Knoppow via Groups.Io
Sent: Monday, 30 March 2020 8:14 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] Equipment identification
??? Well, would you like to tell the rest of us what it is?
Nothing has been posted and the "really good photo" might be interesting to others as well.
On 3/29/2020 3:02 PM, EB4APL wrote:
Hi,
The "mistery" voltmeter has been identified in a really good photo.
So stop trying to figure out what it is.
Thank you anyway,
Ignacio EB4APL
El 29/03/2020 a las 22:50, EB4APL escribió:
Hi,
Could anybody identify the analog meters in the picture? I'm almost
sure that they were HP, probably VTVMs or milivoltmeters. The picture
is from the sixties and I'm sorry but I don't have any better.
TIA,
Ignacio EB4APL
--
Richard Knoppow
dickburk@...
WB6KBL
--
El software de antivirus Avast ha analizado este correo electrónico en busca de virus.
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Re: Generic but decent quality test leads for 3478 DMM
Hey, if you can't seriously injure yourself by misusing them, they aren't sharp enough!? Gotta be able to poke through those oxides, flux residue, etc.? Not to mention high enough spatial resolution not to short out a bunch of pads at once.
I bet those are better than the Pomona Electronics ones I recommended, because of the silicone leads on the Probemaster ones.? Thanks, Sean.? Won't melt if you hit 'em with a soldering iron.? Why no, I've never done that before; why do you ask? ;)
Jim Ford
------ Original Message ------
Sent: 3/29/2020 5:19:09 PM
Subject: Re: [HP-Agilent-Keysight-equipment] Generic but decent quality test leads for 3478 DMM
Jeff,
Get some of these:
Choose the 8018S model. These come with a retractable shroud so they will work with modern DMMs as well as binding posts. I have two pair and I'm thinking about buying more soon. Really nice quality, soft and supple silicone insulation on the leads. SHARP tips...you will poke yourself a few times. :o)
Sean
On Sun, Mar 29, 2020 at 11:53 AM, Jeff AC0C wrote:
Curious for recommendations on some decent quality test leads for use with a 3478 DMM.
The 3478 has a recessed jack and the hooded type leads off a Fluke, etc, won't work.? Normally I use a banana end/clip other end combo for these but from time to time I need to use a conventional hand-held test lead with a sharp pointed end.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
|
Bill Ripley
saipan59 (Pete)
Jared Cabot
