Keyboard Shortcuts
Likes
- HP-Agilent-Keysight-Equipment
- Messages
Search
|
Re: Protecting Equipment
开云体育I mis-spoke. I meant Conducted Emissions. Sorry. ? Tom, N8ZM ? From: [email protected] <[email protected]> On Behalf Of n8zmTWH@...
Sent: Sunday, March 20, 2022 9:22 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] Protecting Equipment ? Limiters are very commonly recommended for Conducted Immunity testing in EMC labs where the Spec An input comes from the Line Impedance Stabilization Network (LISN) because the turn on/off transients can be quite high. The levels expected to be measured typically should be much less than the distortion level of the limiter. The recommended limiter in this case actually has an intentional 10 dB insertion loss. ? Tom, N8ZM ? From: [email protected] <[email protected]> On Behalf Of Lothar baier ? A few words about limiters , Generally limiters are used in systems to protect receivers usually in RADAR or EW applications ,? in test systems the use of limiters s usually frowned upon ( with very few exceptions)? and for good reason ! First of there is a cost penalty that is not insignificant , the cost for a connectorized limiter usually starts at about $600 and can go up into the $2K range . Limiters also degrade VSWR and add additional system loss . But the by far biggest problem is that limiters are non linear devices and as such excellent harmonics generators , harmonics will start to occur before the limiter hits the hard threshold and worsens as the power increases so if you put one in front a spectrum analyzer you have to be cautious not to end up with tst results that are worse than they actually are ? From: [email protected] <[email protected]> On Behalf Of Jim Ford via groups.io ? 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 ?
|
|
Re: Protecting Equipment
开云体育Limiters are very commonly recommended for Conducted Immunity testing in EMC labs where the Spec An input comes from the Line Impedance Stabilization Network (LISN) because the turn on/off transients can be quite high. The levels expected to be measured typically should be much less than the distortion level of the limiter. The recommended limiter in this case actually has an intentional 10 dB insertion loss. ? Tom, N8ZM ? From: [email protected] <[email protected]> On Behalf Of Lothar baier
Sent: Sunday, March 20, 2022 9:03 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] Protecting Equipment ? A few words about limiters , Generally limiters are used in systems to protect receivers usually in RADAR or EW applications ,? in test systems the use of limiters s usually frowned upon ( with very few exceptions)? and for good reason ! First of there is a cost penalty that is not insignificant , the cost for a connectorized limiter usually starts at about $600 and can go up into the $2K range . Limiters also degrade VSWR and add additional system loss . But the by far biggest problem is that limiters are non linear devices and as such excellent harmonics generators , harmonics will start to occur before the limiter hits the hard threshold and worsens as the power increases so if you put one in front a spectrum analyzer you have to be cautious not to end up with tst results that are worse than they actually are ? From: [email protected] <[email protected]> On Behalf Of Jim Ford via groups.io ? 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 ?
|
|
Re: Protecting Equipment
Lothar baier
开云体育A few words about limiters , Generally limiters are used in systems to protect receivers usually in RADAR or EW applications ,? in test systems the use of limiters s usually frowned upon ( with very few exceptions)? and for good reason ! First of there is a cost penalty that is not insignificant , the cost for a connectorized limiter usually starts at about $600 and can go up into the $2K range . Limiters also degrade VSWR and add additional system loss . But the by far biggest problem is that limiters are non linear devices and as such excellent harmonics generators , harmonics will start to occur before the limiter hits the hard threshold and worsens as the power increases so if you put one in front a spectrum analyzer you have to be cautious not to end up with tst results that are worse than they actually are ? From: [email protected] <[email protected]>
On Behalf Of Jim Ford via groups.io
Sent: Sunday, March 20, 2022 2:53 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] 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 ?
|
|
Re: 8516A cable question
Lothar baier
开云体育Yes 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? |
|
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, |
|
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.? |
|
Re: Agilent 3458A Troubleshooting
开云体育Many 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. |
|
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.
toggle quoted message
Show quoted text
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. |
|
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...
toggle quoted message
Show quoted text
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. |
|
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. |
|
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 -- |
|
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?
toggle quoted message
Show quoted text
On Sunday, March 20, 2022, Chuck Harris <cfharris@...> wrote: That brings back a second part to the story of when |
|
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.
toggle quoted message
Show quoted text
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: |
|
Re: Protecting Equipment
开云体育greenboxmaven 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 |
|
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.
|
|
Re: Protecting Equipment
开云体育An 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: |
|
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 |
Willy
Sam Reaves