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Re: Tektronix AM503S AC/DC Current Probe Amplifier system
If you need it done urgently and well, you should see about finding a cal
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lab that still supports it. Calibration requires the appropriate quality of signal generators, some special adapters, and the GPIB board from an AM5030. I have most of the kit, but not enough to do it right. It also appears to be a somewhat intensive process: take measurements, fill out a worksheet, measure % error in several ranges, then update the constants over GPIB. If there's Tek software out there to automate things, I haven't seen it. Dave Casey On Fri, Mar 8, 2019 at 12:34 AM Mark Weimer <inxsof1@...> wrote:
Hello all, |
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Re: More on TEK-Meter THM 565 Repair
Hi Jim! how are you? Pips here from New Zealand, lucky coincidence my wife used to live in Minneapolis for a couple of years she did an Au pair exchange many moons ago, and she of course remembers it very fondly.
I found this THM565 at the bottom drawer of the old manager of the company we run now, and I am experiencing similar faults to what you describe, in my case I'm trying it with batteries, I can clearly hear a beep and a relay contacting when pushing the ON button but no image on the screen, I been told that that was the main problem that's why they left it in that drawer. I could really use it because its very handy and would like to fix it, I'm an old electronics technician and audio engineer, but could use some guidance on what to check and how? from the manual it says that the screen could fade but they only say to take out the battery pack and re instate it. so to me sounds similar to the problems you have experienced. Thank you very much Cheers! Pips Gisborne New Zealand |
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581a repair help.
Rich Collins
My old 581a scope with 82 plug in hasn't been used for a year and when switched on, there was no vertical response, just a horizontal trace. The time base is working fine.The neon indicator is showing the trace is up.I've never had to repair it in the 30 years I've owned it!I have the service manuals. Any advice on what to check initially?
Rich |
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Tektronix AM503S AC/DC Current Probe Amplifier system
Hello all,
I have a Tek AM 503B in a TM502 mainframe. Tektronix AM503S AC/DC Current Probe Amplifier system. The battery on the plugin went dead and it seems to have lost all of its default calibration coefficients. Does anyone here know of a way or of a someone who could do a reload on this plug and calibrate it. Regards Mark |
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Re: 152-0310-00 replacement
I opened up the scope and the parts in question are small and completely gold in colour with two leads also gold in colour. I¡¯m not sure if I got all the writing but I managed to see ¡°0310GE¡± written on them. So, which ones do I have in my scope?
(I had tried to post this the other day but it doesn¡¯t seem to have made through. I apologize if it eventually does!) |
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TEST MESAGE. "You have been removed from [email protected]" WAY OFF TOPIC
TekScopes is all about classic Tektronix test equipment, its use, repair, and collecting.
IT IS NOT ABOUT EMAIL OR PERSONAL COMPUTERS. If you have a valid reason for discussing anything that is not Tektronix related please find a venue where it will be appropriate or take it off line. Please refrain from sending test messages to TekScopes. Thank you, Dennis Tillman W7PF -- Dennis Tillman W7PF TekScopes Moderator |
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Re: TEST MESAGE. "Fw: You have been removed from [email protected]"
Everyone has their own idea of safety. IMO sending emails with personal information using Gmail owned by the biggest snoops in the world using Windows with known backdoors on routers with know flaws is 100% more dangerous than using Yahoo as a place to read Tek mailing list posts. I highly doubt anyone here is using Yahoo for top secret information... Unless Hillary Clinton belongs to this group.
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Brendan On Thu, Mar 7, 2019 at 07:39 PM, <tekscopegroup@...> wrote:
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Re: TEST MESAGE. "Fw: You have been removed from [email protected]"
Anybody at this point still using yahoo mail must not really care much for security and safety. Yahoo mail, really, after all the HUGE and highly publicized repeated security leaks they had not too long ago? Your account is probably compromised already, so please do yourself a favor and get something else, -anything- will be better and safer. Gmail comes to mind. And any other accounts also tied to your Yahoo mail in any way (2FA, fallback, etc) will also be at risk if not already silently compromised and crooks just waiting to act for anything worthwhile to swim by. Really, you need to update now-now.
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Re: 91% Isopropyl Rubbing Alcohol to clean potentiometers?
On Thu, Mar 7, 2019 at 02:10 PM, nonIonizing EMF wrote:
Just double checked... and yes... the green is the DeOxit Fader one that used to be the Cailube MCL if I understand correctly. I also forgot I have a large diameter needle and syringe I used at first. I think this sprays better (more focused and powerful) though was kind of a pain to do since you have to depress fast now that I recall. |
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Re: 91% Isopropyl Rubbing Alcohol to clean potentiometers?
On Wed, Mar 6, 2019 at 06:45 PM, Gary Robert Bosworth wrote:
For IPA fires, some MDSS are saying type A or B or C, extinguishers are good. I keep a carbon dioxide (Type B,C... compressed gas) extinguisher, which is also good for electrical fires, and doesn't make as much of a mess. The temperature that the alcohol/water solution has to be, to ignite, increases with a decrease in alcohol concentration. 70% IPA needs to be at a higher temperature than 90% IPA to ignite. As well, for the same concentration and temperature, methanol, is more flammable than ethanol, is more flammable than IPA (isopropanol). In all cases, it's the alcohol vapor that burns, not the liquid part. The alcohol cannot burn without a source of oxygen. So water on an alcohol fire (as posted by others) cools the liquid, dilutes the liquid, and smothers it. Carbon dioxide gas cools and smothers. |
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Re: 91% Isopropyl Rubbing Alcohol to clean potentiometers?
On Wed, Mar 6, 2019 at 03:15 PM, Bill Carns wrote:
I guess, it depends on what one means/defines as a lubricant. (WD-40 Company, claims/calls it a lubricant.) It does contain (as per the MSDS) some fine oils. About the "steel plates"... fascinating! I'll state my guess as to what happened... but first... WD-40 doesn't attract water. (I can elaborate on that if anyone wants.) About the steel... my guess is he cleaned the mill oil off of the steel with the WD-40... because it will do that... and it leaves only a thin coating of fine oil. That thin coat (for reasons of the way WD-40 works) would "boil" away, in the sun/heat, quickly, and especially over time... exposing unprotected steel... which would rapidly rust. |
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Re: 465 timebase switch fingers not soldered completely?
You do not want to attempt to re-solder those contacts as it will disturb the alignment of the contacts.
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Regards On 3/7/2019 12:49 PM, bbortnick@... wrote:
Hi all, |
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Re: 465 timebase switch fingers not soldered completely?
I have a 475 trigger board that's removed and also has the switch cam removed so all the finger's open I can see one post looks like in your picture it is soldered well on the bottom there is no trace on the top like in yours there is also a silver shine on the post looking with a magnifier. If your don't show some silver solder signs not sure how you can fix it without moving the post?
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Jim O On March 7, 2019 at 1:09 PM bbortnick@... mailto:bbortnick@... wrote: |
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Re: 91% Isopropyl Rubbing Alcohol to clean potentiometers?
On Thu, Mar 7, 2019 at 01:05 PM, nonIonizing EMF wrote:
Not sure which video I watched... though something like this inspired me to research the MSDS's for the more expensive DeOxit Spray cans which led me to determine if I have the time... I mise well make up my own spray equivalent with the squeeze tubes that I bought a sample 4 pack of the 4 types. Here looks like a better video with a better stem to easier refill instead of a bike stem: I've just been using a ~50ml glass bottle with a spray top so far. |
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Re: 91% Isopropyl Rubbing Alcohol to clean potentiometers?
On Wed, Mar 6, 2019 at 02:22 PM, David Slipper wrote:
Hi Dave: I'm aware of "The Best of the Trimmer Primers"... which is a selection of parts of older versions of "The Trimmer Primmer." But, I don't/can't find any of the older versions of (The Trimmer Primer). Does anyone know about those? Regards |
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Re: 91% Isopropyl Rubbing Alcohol to clean potentiometers?
On Wed, Mar 6, 2019 at 02:29 PM, Craig Sawyers wrote:
Hi: Yes, I am not much of a fan of WD40. There is a lot of woo around it. However, there are times when its ability to dissolve gum (originating from mineral oil lubricants) is a good thing. (I've used it to clean some old, but really good, Germain made micrometers, and a Vernier... it worked good for cleaning out 30 year old gummed up oil... I was afraid to use other solvents because I didn't know if they would dissolve the ink/paint in the rulings.) Regards |
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Re: 91% Isopropyl Rubbing Alcohol to clean potentiometers?
Ha, yes, IPA also stands for India Pale Ale!? Best not to confuse with IsoPropyl Alcohol or really bad things could happen...Jim Ford?Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message --------From: Roy Thistle <roy.thistle@...> Date: 3/7/19 12:44 PM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] 91% Isopropyl Rubbing Alcohol to clean potentiometers? On Wed, Mar? 6, 2019 at 01:48 PM, Bill Carns wrote:>> IPA make a great paint remover>I this context IPA = isopropyl alcohol (just so I am on the same page.)My claim is that if you, very broadly separate, finishes into "modern" and "classic", IPA probably only dissolves "classic finishes." The reason I am saying this is because those "classic" finishes: paints, shellacs, and lacquers: they were based on the naturals secretions and saps of insects and trees. Whereas, "modern" finishes are based on synthetic materials. Very generally, many "classic" finishes will be affected by IPA: for instance, natural shellacs; because alcohol (methanol et. al.) is used to dissolve the secretion, to make liquid shellac. More "modern" synthetic finishes, are much more resistant to IPA. (90% IPA is often used to wipe down surfaces, and objects, to kill bacteria.) I'm interested in hearing about IPA dissolving paint. I haven't been able to duplicate that.Regards.
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mrlepipi
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