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| Test Equipment Anonymous (TEA) group therapy thread |
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| cyclin_al:
--- Quote from: factory on June 30, 2022, 07:55:01 pm --- --- Quote from: Cubdriver on June 30, 2022, 04:33:26 am --- --- Quote from: factory on June 29, 2022, 09:40:35 pm ---I thought you won one of the 180 series SA mainframes, in the last PP auction, it should work in the SA mainframe, just some of the later ones haven't got the scope cal outputs, as they were made long after the scope modules became obsolete. I'm I the only one on here with some 180 scopes in my collection? David --- End quote --- I have a 181 here. Lab Cat looking none too pleased with the poor probe compensation: -Pat --- End quote --- A quick warning note for anyone with a HP 181T, 181A oscilloscope mainframe or spectrum analyzer display section (or older 141T,141S,141A), beware there is no protection for the storage CRT with excessive intensity, particularly in normal mode, where you can't see the trace bloom with high intensity setting, the storage mesh is often damaged on these from previous owners not RTFM, or clueless sellers that just turn every control to max until a trace appears. :-BROKE Warning from 141T manual, need to add the 181 warning (aka, use Write & avoid Norm for setting intensity). Another warning, when buying unknown condition 180/181 series mainframes, check the PSU is working correctly, before trying with known good plug-ins, as there was a mention of damage to the plug-ins from a faulty PSU. Some of mine..... David --- End quote --- I noted the same warning in the Tektronix RM564 manual ... which I still have not got round to powering it up. Eventually.... some day |
| Neomys Sapiens:
--- Quote from: Zucca on July 01, 2022, 01:13:38 am ---I am shopping for big amps connectors for my solar/battery system. Can you guys tell me the best way to waste my money to use/connect/terminate those angry copper toys? Knipex again? EDIT, on my way.... --- End quote --- Take a look at Textron Klauke |
| Cubdriver:
--- Quote from: Zucca on July 01, 2022, 01:39:19 am ---Interesting the first comment.... --- Quote ---I like to solder all my lugs on for an even better connection. And in the example at the end where you cut through the 4 - 0 lug, you chose a location where it had not been crimped thereby showing an uncrimped gap inside. Not a nice demonstration. Solder has always been superior to crimp, throughout the history of cable lug use. Not sure where you went to school but we actually tested crimped vs soldered connections for resistance and noticed failures in current draw tests. The solder, when done correctly always produced better results than crimps when done correctly. In most applications, either will suffice. However, for pure results solder wins. Silver based solder is 5% more conductive than copper (copper 100%, silver 105% using copper as the standard conductor). Heating wire tends to distort the insulator so care must be used. I like to use a wet rag to cover the insulation near the end or an cooling paste which is available from most HVAC wholesalers. Silver requires a bit more heat than propane, though so most opt for the crimp. We're talking about the purest method here...in real life and in most situations the crimp will suffice. Its important to know the composition of the lug being used as well. Some are made of aluminum while some are copper and other's copper with a tinned coating. Best to choose one with copper, either bare or tinned, since aluminum tends to oxidize over time which creates friction within the lug. I've seen 'em glowing red like a toaster element from bad connection. I got about 50 years experience in this subject. --- End quote --- --- End quote --- Purely from a resistive point of view that may be true, but overall I don’t think it is - solder will wick into the wire, and turn at least some of it, right where it emerges from the terminal, effectively into a solid conductor - right where it’s anchored and going to be subjected to the most stress. What breaks first when subjected to vibration - solid wire, or stranded wire? Properly made crimps are mechanically sound, more resistant to vibration than soldered ones, and gas tight. https://workmanship.nasa.gov/lib/insp/2%20books/links/sections/201%20General%20Requirements.html#:~:text=Crimping%20is%20an%20efficient%20and,design%20application%20and%20connectivity%20requirements. I’ll stick with crimping, thankyouveryplease… -Pat Edit to add: copied from the first paragraph of the link above: Crimped Terminations Crimping is an efficient and highly reliable method to assemble and terminate conductors, and typically provides a stronger, more reliable termination method than that achieved by soldering. |
| Cubdriver:
--- Quote from: cyclin_al on July 01, 2022, 02:02:29 am --- --- Quote from: factory on June 30, 2022, 07:55:01 pm --- --- Quote from: Cubdriver on June 30, 2022, 04:33:26 am --- --- Quote from: factory on June 29, 2022, 09:40:35 pm ---I thought you won one of the 180 series SA mainframes, in the last PP auction, it should work in the SA mainframe, just some of the later ones haven't got the scope cal outputs, as they were made long after the scope modules became obsolete. I'm I the only one on here with some 180 scopes in my collection? David --- End quote --- I have a 181 here. Lab Cat looking none too pleased with the poor probe compensation: -Pat --- End quote --- A quick warning note for anyone with a HP 181T, 181A oscilloscope mainframe or spectrum analyzer display section (or older 141T,141S,141A), beware there is no protection for the storage CRT with excessive intensity, particularly in normal mode, where you can't see the trace bloom with high intensity setting, the storage mesh is often damaged on these from previous owners not RTFM, or clueless sellers that just turn every control to max until a trace appears. :-BROKE Warning from 141T manual, need to add the 181 warning (aka, use Write & avoid Norm for setting intensity). Another warning, when buying unknown condition 180/181 series mainframes, check the PSU is working correctly, before trying with known good plug-ins, as there was a mention of damage to the plug-ins from a faulty PSU. Some of mine..... David --- End quote --- I noted the same warning in the Tektronix RM564 manual ... which I still have not got round to powering it up. Eventually.... some day --- End quote --- I just want to note for the record that that photo was taken in rather dim lighting, so the phone camera horribly overexposed the appearance of the trace on the scope - it wasn’t set to eye-searing, screen-melting intensity despite the fact that it may seem to be. Also note how bright the pilot light looks, and how dimly lit everything else is in comparison. No CRTs were harmed in the production of that photograph. :-+ -Pat |
| Cerebus:
Talking of ginger and white cats. About 30 minutes ago the living room curtains twitched and about five feet off the ground a furry ginger and white face poked through them. We're not on the ground floor, and we don't have a ginger and white cat. Window now shut to keep the furry burglar out. |
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