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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
On 3/19/22 01:55, Alexandre Souza wrote:
Hey, bad-mood-Dave!Well it's good to be known for something, at least. :-) Children takes the bad quality chinese crap because of price. I was (still I am, surely) a very poor guy and had to use bad quality tools in my childhood. And suffered the effects on that. When I went "pro" I understood the value of good, quality and expensive tools. My first weller soldering iron I got when I was 15, and I still use it!:-) But for hobby...not everyone can afford an E8285A. I have one just because I got it for free. Around $2000 here in Brazil, too expensive fot 98% of all us BraziliansI see your point. I think (and my thoughts on this are evolving with the help of this conversation) that the biggest problem I have is the younger folk not understanding or believing when/if these cheap Chinese instruments are inferior. "Hahahaa, you're dumb, you spend thousands of dollars for an oscilloscope, but I got one for thirty bucks!!" They're all equivalent in the eyes of many of these people, it seems. My thinking is that, whenever possible, we should be mindful of WHY people like us have respect for high-end equipment, and impart that knowledge to the younger generations, so they can appreciate them too. -Dave -- Dave McGuire, AK4HZ New Kensington, PA |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Lothar baier
No activator, just plain chemical but i used a fishtank heater to warm it up
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On Mar 19, 2022, at 09:42, John Griessen via groups.io <john@...> wrote: |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
On 3/18/22 20:04, Zentronics42@... wrote:
I am thinking about switching to cupric chloride as in theory I should not have much of a waste product.That's right. If you get too much volume increase of your solution by using it, some can be neutralized and it precipitates copper oxide out. The remaining water is low copper and neutral, so it can go on the yard plants. Yes, store the solution outdoors and use outdoors away from your favorite cars, tools, or anything else since it releases chlorine and HCl mist from bubbler operation. |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Hi Lothar!
Two questions: When you used Ammonium Persulphate, did you have to add an activator (few drops of something) to make it etch faster?? remember Kepro selling a small bottle with their "kit" that have the "magic" activator. Not sure if its needed.
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Second: What is your eBay handle, sounds like you have some good stuff.
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Regards
Jeff Kruth
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In a message dated 3/18/2022 8:48:14 PM Eastern Standard Time, Lothar@... writes: ?
Actually eventually I switched to ammonia persulphate , cheaper no smell and less stress with mom over holes in shirts ? -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Harvey White via groups.io Sent: Friday, March 18, 2022 7:29 PM To: [email protected] Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! If you can get it, I'd suggest the CuCl method, about 4 parts Hydrogen peroxide (drugstore strength) and 1 part of Hydrochloric (muriatic) acid.? It'll need air bubbling through it as the hydrogen peroxide turns to water. Lots cheaper.? Ferric chloride eventually turns up being CuCl, anyway. Harvey On 3/18/2022 7:26 PM, Zentronics42@... wrote: > I still etch with ferric chloride here at the house. But I do use an earth sciences Hot shaker table with a water bath rather than food prep area. So at least some improvement. > > Zen > > -----Original Message----- > From: [email protected] > <[email protected]> On Behalf Of Lothar baier > Sent: Friday, March 18, 2022 6:55 PM > To: [email protected] > Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! > > Oh lord , I remember me and dad etching circuit boards using ferric > chloride solution on the kitchen stove >> On Mar 18, 2022, at 17:22, Dave McGuire via groups.io <mcguire=[email protected]> wrote: >> >> On 3/18/22 18:00, Zentronics42@... wrote: >>>? ? Zen is one of my names I guess. Living in the digital age you seem to collect things like names. >>> I have gone by Zenwizard on line for going on 25 years now. For off line use I am an Eric, however there are also some that know me as Adain (there is a LONG off topic story there). >>? Ah, sorta.? I've been living in that same digital age, but never did the nickname thing.? We don't have rigid rules here, but this is a mailing list of mostly professional types, so we do prefer the use of given names.? I'm by no means bossing you around on that, but just consider it a light suggestion from a list moderator. >> >>? Either way, welcome! >> >>> I am honestly looking to push the lab in to the RF space. But even now the gear is cost prohibitive to acquire at a rapid pace. I have recently (with in the last year) been able to acquire proper spectrum analyzers for the lab. HP E4411B and HP 8596E.? I have my 10 Mhz reference sorted this year as well. So lab building is going well but it is slow. I am targeting some VNA and some microwave equipment as well as precision DC and calibration standards. I am in to the expensive toys it seems. >>? RF is great fun, and a wonderful thing to sink your teeth into.? But yes, it does get expensive.? The "good/fast/cheap (pick any two)" rule applies here; amazing deals can be had if you're patient, but personally I think patience isn't all it's cracked up to be.? If we keep waiting, by the time we're dead, we'll have great stuff...No thanks!? But really good deals do come along from time to time, if you're lucky. >> >>? Your E4411B and 8596E are a great start.? You'll need some good signal sources too, and a good microwave counter.? Next would probably be a power meter.? Fortunately these are all pretty easy to come by, with the possible exception of a sensor for the power meter. >> >>>? ? As for background it is extremely wide and varied. But most of it has been electronics based, computer based, or getting the two to talk to each other in some way. >>>? ? I'll also be taking two students to their first swap meet in a few months... their first one will be the Dayton Hamvention. So we are going to start small? >>? Hahaaa yes, trial by fire indeed. ;)? If their minds aren't totally >> blown by that, they might survive! B-) >> >>? I'm about 4.5hrs East of Dayton; I may have some gear for you, but you'd need some car space.? That may be a challenge after Dayton. ;)? I also run the Large Scale Systems Museum (google it) which you might find interesting, if it would be convenient for you to extend that Hamvention road trip. >> >>? ? ? ? ? ? -Dave >> >> -- >> Dave McGuire, AK4HZ >> New Kensington, PA >> >> >> >> >> > > > > > > > > > > > |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
And store it outside if at all possible, and not on concrete.? It outgasses and will rust iron or steel.
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Harvey On 3/19/2022 5:18 AM, Wilko Bulte wrote:
+1 for CuCl etching. Do use a wel ventilated area! |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Yes, and no.
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With an insulating resist, it will etch the copper away as long as there is active etchant in the tank. With a solder resist, the under cut is prevented by the action of the tin/lead. Sort of like how zinc protects the steel around it from rusting in the galvanize process. Given enough time in the tank, all active metals will disappear into solution. -Chuck Harris On Sat, 19 Mar 2022 01:14:06 -0400 Zentronics42@... wrote:
Time is also a problem to long in the tank is a guaranteed over etch. |
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Re: Agilent 3458A Troubleshooting
¿ªÔÆÌåÓýThanks everyone for the replies and for all the favourable comments about the 3458A. ? I forgot to mention that I have checked the power supply voltages and they are all OK. ? If I can¡¯t make any headway from members of this group, I will certainly try eevblog next. ? Cheers, George ? ? From: [email protected] [mailto:[email protected]] On Behalf Of tmillermdems
Sent: Saturday, 19 March 2022 2:43 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] Agilent 3458A Troubleshooting ? You can get the clip from Artekmedia. The first step is always to check all the low voltage power supply voltages. The calibration on the 3458a just needs a precision 10 volt reference and an accurate 10 k resistor. It is a wondeful instrument but repair and cal Keysight is a bit painful. It is still in production. Regards and good luck. ? On 3/18/2022 10:30 PM, Labguy wrote:
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
The best PCB films I ever managed to get were done by a friend who was into the offset printing business. They had film imagers at the time which could convert a CAD file into 4800dpi polyesterbase graphical film. "Flawless" edges, within reason.
2nd best I did myself using a surplus graphical camera from the same printing branch. Agfa Copyproof film, I still remember. All this kind of equipment is long since obsolete. Wilko |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Agree with the FR-4 Comments. The Dielectric Constant (ER and ER') changes based on manufacturer and other properties.
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As is always said, a Dielectric Constant, isn't. FR-4 changes based on Frequency. The Standard was measured at NIST as a thick cube or block. That Standard is right around 4.5. At 1 GHz, it is around 4.05. So based on the base Frequency and edge rate (like 1 ns), of a digital signal, you need to consider that in your design. Also consider that your Stack-up thickness tolerance is generally +/-10%. That affects your target Impedance. It is caused by the heat/pressing/weave nesting (Resin vs. Glass), of creating the stack-up. Couple that with your Line Width tolerance plus over/under etch tolerances from vendor-to-vendor. That's why it is a good idea to have the vendor work with you when you have your design nearly completed. You may have to change your line widths or stack-up thicknesses. It varies from vendor-to-vendor too. Some will blow up the layer with the CAM Software and then shoot the layers reduced. Their tolerances vary. They generally use a TDR to measure Impedance on their PCB Coupons. They establish and control their processes this way. A Polar TDR and Tek TDR will give different values based on the launch and step rate. Make sure you trust it. The Impedance also varies based on where the Coupon is located on the panel (usually 18 x 22"). The pressing isn't always uniform across the panel. If you are designing very high-rate Digital Boards, you would look at other dielectrics and Weave Bias Routing options. FR-4 can be used for <2GHz Frequencies as Lothar recommends. Above that, aside from the change in Dielectric Constant, the Dielectric Losses (Loss Tangent), become prohibitive too. The Rogers 4003 and 4350 he recommends are good choices for GHz work. For more information you can check out IPC4103 Slash sheets for Duroid, PTFE Dielectrics. Ross Wellington -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Lothar baier Sent: Friday, March 18, 2022 9:58 PM To: [email protected] Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! With FR-4 you definatly have issues with ER lot variations this is why you use materials like rogers 4350B -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Dave McGuire via groups.io Sent: Friday, March 18, 2022 9:22 PM To: [email protected] Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! On 3/18/22 22:19, Lothar baier wrote: If you do edge coupled microstrip filters or directional couplers thanYes. There's a great deal of activity in building replacement boards and modules for instruments like ours (trying to bring this further on-topic), so if the results there are adequate, this does open up some possibilities. One thing that causes trouble with the more affordable board houses is that sometimes they change substrate compositions, so the published dielectric constant isn't always something you can count on. -Dave -- Dave McGuire, AK4HZ New Kensington, PA |
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FYI: Added HPBASIC Documentation from TAMS to VintHPcom group
I'm including this notification here, since this group also has many users of HPBASIC.
I just added the 1999 Version of the TAMS HPBASIC Documentation CD contents to the files section in the VintHPcom group. /g/VintHPcom/files/HP%20RMB%20Basic/Documentation/HPBASIC%20Documentation%20from%20TAMS TAMS has generously given permission for personal use/reference of this documentation, for which I am specified as the grantee. The documentation is in HTML format and is intended for use only on individual personal systems, NOT to be placed onto a Web server for general public viewing. There probably are newer versions of this documentation (TAMS 2047K or 98616K-0100), if so please let me know and if possible share it with me so that I can include here in groups.io. |
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Re: Agilent 3458A Troubleshooting
¿ªÔÆÌåÓýHi Congrats Try a look at eevblog---they have done alot of work with HP 3458. Regards Hardy ? Fra: [email protected]
[mailto:[email protected]] P? vegne af Labguy ? I am trying to restore an HP3458A DVM and I need a little
help. |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Hey, bad-mood-Dave! Children takes the bad quality chinese crap because of price. I was (still I am, surely) a very poor guy and had to use bad quality tools in my childhood. And suffered the effects on that. When I went "pro" I understood the value of good, quality and expensive tools. My first weller soldering iron I got when I was 15, and I still use it!? But for hobby...not everyone can afford an E8285A. I have one just because I got it for free. Around $2000 here in Brazil, too expensive fot 98% of all us Brazilians I am happy children are buying crap tools. In the past theu couldn't afford anything. Been there... 73 de alexandre pu2sex Enviado do meu Tele-Movel Em qui, 17 de mar de 2022 22:28, Dave McGuire <mcguire@...> escreveu: On 3/17/22 21:16, Lothar baier wrote: |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
I think I might still have one or two.? Of course they are perfectly safe unless you mistreat them, and that applies to so many things.? I'm always on the lookout for Hg in old thermostats, etc.? Both to keep it out of the landfill, and to add to my collection.? I'm glad I grew up when I did; I'd hate to be a kid these days when everything is so "safe"!? ? -Dave ? It has been strange to watch the pendulum swing over the years in that respect. I have known a time when we still had silver thermometers. ? Zen From: [email protected] <[email protected]> On Behalf Of Radu Bogdan Dicher
Sent: Saturday, March 19, 2022 12:10 AM To: [email protected] Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! ? Dave, Eric! (as I've known you as Zen over emails), ? Agewise, I'm probably right between you two, though?I'll wager far closer to Eric than Dave. Likely at least the same generation. I've been doing tubes for a good bit over 15 years, and repeatedly getting to taste the 450V of my amps' B+ hasn't ever deterred me. I started with electronics at about 7, and no one watched me much if at all at the club house when I was etching my boards with acid.? ? That said, I do want to suggest a certain amount of reserve with how we feel about the dangers of industry from certain times. I grew up in the most polluted place in Europe in the '80s (to substantiate, this orange acid rain was coming down most evenings around 6:30PM, so no one would ever be out for a couple of hours around that time, particularly in the fall, due to factory schedule of heavy chemicals waste release through unfiltered tall towers and atmospheric?conditions on this riverbed valley, and hanging clothes to dry was a lottery in terms of whether you'd be picking them black when dry due to other chemical agents being released in the air at other times, and for kms around this factory, up and down that same valley, the landscape was factually lunar as there was no growth on the bare, red, soil) and I can tell you living?with heavy metals around you, and inside you, does have effects on your body (and probably mind). I am saying this based upon my experience, and growth as a young boy. I am very careful with my kid around my bench.? ? Now, all this said, I want to make sure I thank you, Dave, for encouraging me on a certain project a while back (the younger hobbyist tackling a b..ch of a problem). I can't overstate how important this is, for folks from newbies to maybe some of the veterans. Some of these projects are not easy - if they were, no one would ask for help, and this forum would probably have little reason for being. I don't think we tend to have enough regard for encouraging the OP (sweating and swearing at their bench over a perplexing issue, and probably hating their project a bit at the point of asking for input), and making them feel as part of a community. THIS IS HUGE. I almost never capitalize, but here it's called for, and I am.? ? I am stating this to point out Dave's points, demeanor, and moderation on this forum. Fantastic job at this, Dave.? Radu.? ? On Fri, Mar 18, 2022 at 7:44 PM Jim Ford <james.ford@...> wrote:
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Time is also a problem to long in the tank is a guaranteed over etch.
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-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Chuck Harris Sent: Friday, March 18, 2022 11:57 PM To: [email protected] Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! Whether or not a board under etches traces, or over etches traces is entirely dependent on the resist used. Insulating resists don't create any fields in the tank, so they tend to over etch the traces: \^^^^^^^^/ . Metallic resists (gold, solder) do create electric fields that electrolytically deflect the etching action away from the resist, so they tend to under etch the traces: /^^^^^^^^^\ . (Or is it the other way around? It has been so long ago.) -Chuck Harris On Sat, 19 Mar 2022 00:52:13 +0000 "Lothar baier" <Lothar@...> wrote: Eventually dad bought a etch tank from isel , it used a different |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
¿ªÔÆÌåÓýRadu, ????????????? Totally agree. I have spent some time in what we will call heavy industry. It is one thing to know that a Tek 576 can light you up with 1500 Vdc and might kill you. It is QUITE another to stand next to a peace of equipment that will DEFFINATLY kill you and not even notice that you are in the way. Safety is key in any lab or industrial environment. Respect and caution is needed, abject terror can also be harmful. We don¡¯t need a full flame retardant hazmat suit to deal with an isopropyl alcohol spill. Though HR might want me to use one. ?I have run in to quite a few that won¡¯t take a failed power supply apart and even look at it ¡°because it plugs in to the wall¡± one of my goals is to empower people especially just starting out. Those first few successes are critical. But if one of the first projects is a CRO scope it is also good for some one to say hey don¡¯t touch the fat red wire. Weird stuff like insulation doesn¡¯t work so well at 21,000 Vdc ? It has been strange to watch the pendulum swing over the years in that respect. I have known a time when we still had silver thermometers. ? Zen From: [email protected] <[email protected]> On Behalf Of Radu Bogdan Dicher
Sent: Saturday, March 19, 2022 12:10 AM To: [email protected] Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! ? Dave, Eric! (as I've known you as Zen over emails), ? Agewise, I'm probably right between you two, though?I'll wager far closer to Eric than Dave. Likely at least the same generation. I've been doing tubes for a good bit over 15 years, and repeatedly getting to taste the 450V of my amps' B+ hasn't ever deterred me. I started with electronics at about 7, and no one watched me much if at all at the club house when I was etching my boards with acid.? ? That said, I do want to suggest a certain amount of reserve with how we feel about the dangers of industry from certain times. I grew up in the most polluted place in Europe in the '80s (to substantiate, this orange acid rain was coming down most evenings around 6:30PM, so no one would ever be out for a couple of hours around that time, particularly in the fall, due to factory schedule of heavy chemicals waste release through unfiltered tall towers and atmospheric?conditions on this riverbed valley, and hanging clothes to dry was a lottery in terms of whether you'd be picking them black when dry due to other chemical agents being released in the air at other times, and for kms around this factory, up and down that same valley, the landscape was factually lunar as there was no growth on the bare, red, soil) and I can tell you living?with heavy metals around you, and inside you, does have effects on your body (and probably mind). I am saying this based upon my experience, and growth as a young boy. I am very careful with my kid around my bench.? ? Now, all this said, I want to make sure I thank you, Dave, for encouraging me on a certain project a while back (the younger hobbyist tackling a b..ch of a problem). I can't overstate how important this is, for folks from newbies to maybe some of the veterans. Some of these projects are not easy - if they were, no one would ask for help, and this forum would probably have little reason for being. I don't think we tend to have enough regard for encouraging the OP (sweating and swearing at their bench over a perplexing issue, and probably hating their project a bit at the point of asking for input), and making them feel as part of a community. THIS IS HUGE. I almost never capitalize, but here it's called for, and I am.? ? I am stating this to point out Dave's points, demeanor, and moderation on this forum. Fantastic job at this, Dave.? Radu.? ? On Fri, Mar 18, 2022 at 7:44 PM Jim Ford <james.ford@...> wrote:
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Re: HP83595A/B (HP 8350) ROM firmware required
Thanks!
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-----Message d'origine-----
De : [email protected] <[email protected]> De la part de Dave McGuire Envoy¨¦ : 18 mars 2022 22:09 ? : [email protected] Objet : Re: [HP-Agilent-Keysight-equipment] HP83595A/B (HP 8350) ROM firmware required If you don't need version 7 specifically, version 9 for 83595 is available from the KO4BB archive: -Dave On 3/18/22 22:02, Yves Tardif wrote: Hi, I have 8350B ver7 with 83595A with version 3, have you found -- Dave McGuire, AK4HZ New Kensington, PA |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Dave, Eric! (as I've known you as Zen over emails), Agewise, I'm probably right between you two, though?I'll wager far closer to Eric than Dave. Likely at least the same generation. I've been doing tubes for a good bit over 15 years, and repeatedly getting to taste the 450V of my amps' B+ hasn't ever deterred me. I started with electronics at about 7, and no one watched me much if at all at the club house when I was etching my boards with acid.? That said, I do want to suggest a certain amount of reserve with how we feel about the dangers of industry from certain times. I grew up in the most polluted place in Europe in the '80s (to substantiate, this orange acid rain was coming down most evenings around 6:30PM, so no one would ever be out for a couple of hours around that time, particularly in the fall, due to factory schedule of heavy chemicals waste release through unfiltered tall towers and atmospheric?conditions on this riverbed valley, and hanging clothes to dry was a lottery in terms of whether you'd be picking them black when dry due to other chemical agents being released in the air at other times, and for kms around this factory, up and down that same valley, the landscape was factually lunar as there was no growth on the bare, red, soil) and I can tell you living?with heavy metals around you, and inside you, does have effects on your body (and probably mind). I am saying this based upon my experience, and growth as a young boy. I am very careful with my kid around my bench.? Now, all this said, I want to make sure I thank you, Dave, for encouraging me on a certain project a while back (the younger hobbyist tackling a b..ch of a problem). I can't overstate how important this is, for folks from newbies to maybe some of the veterans. Some of these projects are not easy - if they were, no one would ask for help, and this forum would probably have little reason for being. I don't think we tend to have enough regard for encouraging the OP (sweating and swearing at their bench over a perplexing issue, and probably hating their project a bit at the point of asking for input), and making them feel as part of a community. THIS IS HUGE. I almost never capitalize, but here it's called for, and I am.? I am stating this to point out Dave's points, demeanor, and moderation on this forum. Fantastic job at this, Dave.? Radu.? On Fri, Mar 18, 2022 at 7:44 PM Jim Ford <james.ford@...> wrote:
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Lothar baier
So the challenge you run into when building replacement modules ( and I am entertaining the idea right now for the power amplifier MIC in the 8753 sources ) is that first of most microwave circuits use ceramic and are wire bonded , although substrates exist that offer similar dielectric properties than Al2O3 wire bonding on those substrates is not trivial !
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The bigger challenge though is to figure out the specs of the original module , I been thinking about using a bad 8753 source and rigging it up with some test points to measure power and DC voltages going into the power amp and the loss from output to the step attenuator but right now I haven¡¯t found the motivation yet -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave McGuire via groups.io Sent: Friday, March 18, 2022 9:22 PM To: [email protected] Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! On 3/18/22 22:19, Lothar baier wrote: If you do edge coupled microstrip filters or directional couplers thanYes. There's a great deal of activity in building replacement boards and modules for instruments like ours (trying to bring this further on-topic), so if the results there are adequate, this does open up some possibilities. One thing that causes trouble with the more affordable board houses is that sometimes they change substrate compositions, so the published dielectric constant isn't always something you can count on. -Dave -- Dave McGuire, AK4HZ New Kensington, PA |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Lothar baier
Back when I worked at UT as a research engineer we had a laser cutting system for MMIC Dies , it was a interesting device but required a lot of skill and experience to use , when you looked through the scope it looked like carpet bombing ?
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-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Bryce Schroeder via groups.io Sent: Friday, March 18, 2022 9:22 PM To: [email protected] Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! I've looked at the laser'd traces from above a lot, tested their isolation with a megger, etc and found them all satisfactory, but I don't know how the roughness is side-on. It would be interesting to investigate. The laser is fundamentally a pulsed device, but the pulse rate is in the 10s of kHz (up to maybe a MHz depending on the particular kind of laser) and cutting through even ordinary half oz copper is a lot of individual passes. Definitely something to investigate. On Fri, 18 Mar 2022 at 22:19, Lothar baier <Lothar@...> wrote:
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Dave McGuire
rmb_guru
Alexandre Souza