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- HP-Agilent-Keysight-Equipment
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Re: 8516A cable question
Lothar baier
¿ªÔÆÌåÓýYes that should work fine ! ? From: [email protected] <[email protected]>
On Behalf Of Willy via groups.io
Sent: Sunday, March 20, 2022 6:04 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] 8516A cable question ? 07 APR 92 shows up on the right display of my 8340B, SN is 3050A. Is this new enough? |
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Re: HP 54522A - risetime measurement vs. graticule readings
Here is the attachment.? On Sun, Mar 20, 2022 at 5:09 PM Radu Bogdan Dicher via <vondicher=[email protected]> wrote: Hi all, |
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HP 54522A - risetime measurement vs. graticule readings
Hi all,
Working on aligning another instrument last night, my scope - which I typically find extremely reliable for all the readings it's able to perform (from voltage/level to time-based and everything in between) - has been giving me some confusing readings. I could use some community "sanity checks" on my thinking here, please.? Per enclosed scope screenshot (coming up), the rising segment of this triangular wave (which triggers a VCOs period) is in my book (per graticules indication) 120ms. And yet, the scope sees that as a 32.35ms risetime wave. The scope reading was rather fluctuating, but at no point coming even close to the 120ms I'd expect. Please note the period reading seems to be correct.? Given the information presented on the image, when I was doing this last night, I decided to ignore the "risetime" reading and execute the adjustment I was required (120ms sweep time) as the image shows it.? What could be going on here?.... Am I looking at this wrong? Or shall I start worrying that my scope is beginning to exhibit some sort of illness? Thank you.? Radu.? |
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Re: Agilent 3458A Troubleshooting
¿ªÔÆÌåÓýMany thanks Matt. I will take a look. ? Cheers, George ? From: [email protected] [mailto:[email protected]] On Behalf Of Matt Huszagh ? If you haven't seen it yet, Illya Tsemenko (xDevs) has done extensive work on these machines and documented the process thoroughly. See for example . I think there are other posts too. |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Yep, I've used ferric chloride, and one of the disadvantages was that the etch product (copper chloride?) is dark and opaque and collects over the copper being etched. So agitation is in order, so that you can 1) see that the etching process is progressing, and 2) prevent the etch product from slowing or stopping the etching process. I'd heard of people putting marbles in the bottom of the etch tank and putting the board to be etched upside-down so that the etch product just falls off the board. But you can't easily monitor the process.
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And monitoring is necessary; my first attempt back in the late 1980's failed because I had bad etchant. I left it sit with a heater under the tank for at least 10 hours while I went to work at my day job, and it didn't etch at all. Got another bottle of ferric chloride, and the second attempt was done in about 10 minutes. With some bumps every few seconds to move the etch product off the board. IIRC, I diluted the waste in the tank with lots of cold water and poured it down the toilet. Jim Ford ------ Original Message ------
From: "Lothar baier" <Lothar@...> To: "[email protected]" <[email protected]> Sent: 3/20/2022 2:21:46 PM Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! Ferric cloride wasn¡¯t used commercially for PCB making in Germany probably because of the potential impact on worker health but also because it was pretty aggressive, most companies used ammonia persulfate compositions one advantage of the stuff was that it was transparent so you were able to watch the progress of the etching. |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Hmmm... I assume these stories come from before the lawyers took over everything and avoiding liability became the number one priority. Strange...
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Jim Ford ------ Original Message ------
From: "greenboxmaven via groups.io" <ka2ivy@...> To: [email protected] Sent: 3/20/2022 12:35:58 PM Subject: Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns! I used to think mean cruel mangement was unique to the Syracuse area. A friend went to dental offices asking for their old X-ray photo chemicals. 99% of them not only refused, they were actually furious at him for asking. They insisted on pouring it down the sewer, which did not help our already overloaded treatment plant. The silver residue was very toxic to the bacteria used to digest the sewage. Those of us working in consumer electronics sweatshops didn't fare any better. There would be massive amounts of abandoned equipment in attics and back rooms, yet the shop owners would not allow us to take it home or even buy it. It was always VERY curious that when I went on vacation and returned, they had decided while I was gone was just the time to clean out the junk room. By the late 70s, almost all of us had escaped to far better careers and the sweatshops were out of business. |
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Re: Protecting Equipment
Mini-Circuits sells limiters as well as DC blocks, but they only go up to 8 GHz.? Not sure about the price, but they are most likely competitive.? Assuming you actually need one. Jim Ford
------ Original Message ------
From: "Matt Huszagh" <huszaghmatt@...>
Sent: 3/20/2022 6:52:14 AM
Subject: Re: [HP-Agilent-Keysight-equipment] Protecting Equipment It's worth adding that a DC block only provides some measure of safety. The ramp up voltage of a DC signal is an AC signal and can pass right through your series cap. If you look at DC blocking filter designs like the HP 3048A option K23, there's a limiter after the series cap. It seems like the "right" devices for this sort of thing are RF power limiters. Unfortunately, the cost of many of these devices new from reputable manufacturers probably matches or exceeds what many people paid for their second-hand spectrum analyzer. Maybe there are good second-hand market options, but I haven't looked into to it. If you want something to reliably protect a low frequency SA, that shouldn't be too hard to design and build. But, if you want to get the full 22 GHz range out of your 8566, I expect that wouldn't be so easy. |
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Re: ESG-DP E4437B Signal Generation Issue
Hi guys,
Thanks for the replies.? I have had some health issues for a while, and won't even feel up to working on my unit for a week or two.? When I do, I'm going to solder a couple pieces of RG174 with SMA's, and take a look at the input and output of the divider with my SA.? Hopefully, this will let me know that in fact the divider is the problem. Again, Thanks, 73, Tom -- KJ6SVS -- |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Goldsmiths and jewelers all have a (or used to) under their and work bench to catch gold and silver dust and shavings. They'd send the carpet out for metal recovery every so often and buy a new carpet?
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On Sunday, March 20, 2022, Chuck Harris <cfharris@...> wrote: That brings back a second part to the story of when |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
Lothar baier
Ferric cloride wasn¡¯t used commercially for PCB making in Germany probably because of the potential impact on worker health but also because it was pretty aggressive, most companies used ammonia persulfate compositions one advantage of the stuff was that it was transparent so you were able to watch the progress of the etching.
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One company I remember we visited back when i was in trade school used a spray etch line which was pretty cool to watch On Mar 20, 2022, at 12:36, greenboxmaven via groups.io <ka2ivy@...> wrote: |
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Re: Protecting Equipment
¿ªÔÆÌåÓýgreenboxmaven via groups.io wrote on 3/20/2022 2:02 PM: Hello-- Dual-primary transformers can serve as isolation transformers. Use one 120 V primary as the AC input winding, and? the second 120 V winding to power the device you're testing. Note that tested devices using? half-wave rectification? may require significant transformer derating. 73-- Brad? AA1IP |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
I had an experiment kit where the component leads were held in a bundle by a spring. Transistors were on a small square pcb that reached 3 pins (possibly with a commoned lead). I also had a Philips MW radio kit with plastic posts, and the wires similarly clamped together but by a nut and bolt.
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Re: Protecting Equipment
¿ªÔÆÌåÓýAn older Uninterruptable Power Supply makes a very convenient way to reduce line voltage. Find one of the old "loaf of bread" sized units that uses the large 60 cycle transformer, rather than the newer ones that use a switching inverter. Remove everything except the transformer, fuse holder, outlets and switch. Use one half of the? primary winding along with the 120 volt secondary to make an autotranformer. It will drop 120 volts to about 109, which is much easier on older gear designed for 110 or 115 volts.? ???? Bruce Gentry, KA2IVY
On 3/20/22 13:45, saipan59 (Pete)
wrote:
On Sun, Mar 20, 2022 at 08:59 AM, Lothar baier wrote: |
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Anyone have a BNC Connector for a HP5460XB Series scope.
I have a HP54602B that has a BNC connector that has been damaged beyond repair. Does anyone have one of these BNC connectors from a scrapped PCB?
The BNC for the B series is vastly different than the A series or the ones? that have probe detection. I believe that these were made specifically for HP by Trompeter Electronics as they have the part number 54601-27601-1 and the Trompeter Triangle symbol on them. They mount with a T8 metric screw and have the alignment pin shown in the pictures. Thanks for looking! Sam W3OHM |
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Re: Protecting Equipment
On Sun, Mar 20, 2022 at 08:59 AM, Lothar baier wrote:
Its not really a problem in real life since most DC blocks only have capacitors that are 100n or lower, the short current pulse doesn¡¯t hurt anything!It seems to me that saying "100n is small enough to protect the circuit" is not the answer, without stating how big the DC level is. Isn't it the ENERGY absorbed by the delicate components that is key? A different variation on Protection: The AC line voltage here is routinely 125V. Some older equipment might be "stressed" by that. I use a buck transformer to bring it down to about 115V. The transformer, coincidentally, came from an HP spec-an that I disassembled for parts. Pete |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
I used to think mean cruel mangement was unique to the Syracuse area. A friend went to dental offices asking for their old X-ray photo chemicals.? 99% of them not only refused, they were actually furious at him for asking.? They insisted on pouring it down the sewer, which did not help our already overloaded treatment plant. The silver residue was very toxic to the bacteria used to digest the sewage. Those of us working in consumer electronics sweatshops didn't fare any better.? There would be massive amounts of abandoned equipment in attics and back rooms, yet the shop owners would not allow us to take it home or even buy it.? It was always VERY curious that when I went on vacation and returned, they had decided while I was gone was just the time to clean out the junk room.? By the late 70s, almost all of us had escaped to far better careers and the sweatshops were out of business.
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?? Bruce Gentry, KA2IVY They certainly do recycle the copper! I presented the information to the VP of the company, and |
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
¿ªÔÆÌåÓýI was born in 1950, and my technical
interests were growing exponentially by 1957. I never saw or
heard of the Philips project kits until now. Indeed, Philips or
Norelco electronic items were very scarce where I was. Until the
late 1960s, the only Norelco products one would see for sale
where I was were shavers and a few cassette recorders. I
certainly saw and repaired a lot of Philips radios and sound
gear brought into the TV shop I worked at, but it was all bought
and brought there from elsewhere, usually by returning military
people. The only training and project kits available in local
stores were the Erectronic Transistor Kit, a few very simple
kits by Remco, and some project kits by General Electric. There
were kits offered in the back of magazines, but the Philips is
the best one of that period I have seen yet. How much did the
Philips kit cost?? ??? Bruce Gentry, KA2IVY On 3/20/22 11:33, John Griessen wrote:
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Re: BS, was Re: [HP-Agilent-Keysight-equipment] Spread the word -- Swap Meet Returns!
That brings back a second part to the story of when
I used to make circuit boards professionally: The company I was working for, Electro Products, Inc... I mention them because they are long gone... made a lot of circuit boards as part of being a full service assembly house. Anyway, they bought ferric chloride by the 30 gallon carboy, and poured it all down the sanitary drain when they were done. The plumbers had come in twice that I was aware of to break up the floor and replace the cast iron drain pipe. So, I was talking to the guy that delivered the latest batch of carboys, and he casually mentioned that his company would give me $30 for each carboy returned full of used etchant. They certainly do recycle the copper! I presented the information to the VP of the company, and he said no. The etchant tank had a plastic garden hose fitting at its bottom, so I told him that I was willing to fill the old carboys, with a garden hose, and even work for free, as we used at least one carboy per day, which exceeded my hourly pay... He said no... I guess he liked pouring money down the drain for some reason. -Chuck Harris On Sat, 19 Mar 2022 16:39:29 +0000 "Lothar baier" <Lothar@...> wrote: Recycle my butt ?lol , when the etchant was Saturated it was dumped |
Willy
Sam Reaves
saipan59 (Pete)
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