Search found 48 matches
- Fri Mar 29, 2024 10:36 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Let's get this straight. You have a wife who tolerates you harbouring a Tek 575 and you joke around with her. You are indeed blessed. She was with me in Heidelberg and she even grabbed one of the handles of the 175 to get it into the car :o She is a wonderful wife and we are now married 31 years!
- Fri Mar 29, 2024 9:39 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Thanks for all the wishes... I caught a cold and my wife and me we were asking ourselfs about last being ill and joking around. Then she gave me a test and sure it showed two lines... Of course photos are required, first the 575. I just repaired the 2x pushbutton which had bad contact (NC) and was j...
- Thu Mar 28, 2024 8:07 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Since Saturday I am now owner of a Tek 575 in good condition accompanied with a 175. Haven't tested it yet. Was a trip to Heidelberg over the weekend. And as a by-catch: I got CoViD ![Sad :(](./images/smilies/icon_e_sad.gif)
![Sad :(](./images/smilies/icon_e_sad.gif)
- Mon Jan 22, 2024 1:46 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
- Sat Jan 13, 2024 5:28 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Well hello everybody! I already prepared some time ago and end of last year I went to the FabLab here and got a safety briefing and an introduction. Yesterday I thought it was time for some amusement, so I took a piece of 4mm PMMA and went to the CO2 laser cutter. After much talking with the people ...
- Mon Dec 25, 2023 9:36 pm
- Forum: Test Equipment
- Topic: Not A Good Christmas
- Replies: 26
- Views: 6609
Re: Not A Good Christmas
Well Mike, that is not good news. Best wishes to Blondie and to you. And glad you still arrived in time.
- Tue Dec 19, 2023 1:18 pm
- Forum: Test Equipment
- Topic: The Meme and Jokes Thread
- Replies: 236
- Views: 64696
Re: The Meme and Jokes Thread
To be fair I read that fairly late on, after I'd been throwing together web applications for a few years. Haha, web development... We are just facing some shit from the group that throws AWS on everything not being nailed down. Now they arranged to use AWS IOT but failed to nail them to fixed IPs (...
- Mon Dec 11, 2023 9:00 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
- Mon Dec 11, 2023 2:09 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Will do...
- Mon Dec 11, 2023 11:13 am
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Well, you can't have too many multimeters, can you?
Today two Keithley 177 arrived. They should be working, but have to verify that. I suspect they are in a need for some love... Quite a lot yellowing on the case.
Today two Keithley 177 arrived. They should be working, but have to verify that. I suspect they are in a need for some love... Quite a lot yellowing on the case.
- Fri Nov 17, 2023 11:23 am
- Forum: Test Equipment
- Topic: The Meme and Jokes Thread
- Replies: 236
- Views: 64696
- Fri Nov 03, 2023 10:49 am
- Forum: Test Equipment
- Topic: The Meme and Jokes Thread
- Replies: 236
- Views: 64696
- Fri Oct 20, 2023 2:04 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
- Fri Oct 13, 2023 2:57 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Either way, with a 40kΩ input resistor there's going to be less than 1mA through it, and I'd expect the feedback network to be able to absorb excess voltage at those power levels. Hmm, the feedback loop is directly coupled to the input, the 40k is "only" in front of the op amp. In range 2...
- Wed Oct 11, 2023 7:30 pm
- Forum: Test Equipment
- Topic: Tektronix 1240 Logic Analyzer
- Replies: 2
- Views: 2868
Tektronix 1240 Logic Analyzer
I got a Tek 1240 from a friend. Offered for free. "Distorted image" was the symptom. So I said yes. It took some time for the instrument to arrive. I repaired it. The offending part was a kind of Zener-Crapacitor, an electrolyte being installed in wrong polarity in the factory. My repair r...
- Wed Oct 11, 2023 7:06 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Hmm, I don't think R223 is a NTC either. Both have the same symbol with +Theta, I would expect -Theta for an NTC. And if its an NTC/MOV, the traces to it will explode with powerful +250Vrms fed into it.AVGresponding wrote: ↑Wed Oct 11, 2023 6:06 pm R223 has to be an NTC/MOV, given its placement.
Is Discord down for anyone else?
- Tue Oct 10, 2023 7:04 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
It does appear to be protected by a MOV/NTC resistor though. The schematic is a bit all over the place... NTC? I suspect R221 is a PTC. In combination with the Zeners at the output of the Opamp it will limit the current. Quite interesting they use a PTC in the feedback loop of the Opamp, as this re...
- Tue Oct 10, 2023 3:43 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
The 2525 has that motorised range switch. I can't provide comparison measurements as I only have a 2503 and 2521 in my weird Philips section... Thanks, that helped me a lot :mrgreen: The service manual for the 2521 has a more detailed circuit diagram of the I-V converter in Fig. 25. I suspect it to...
- Mon Oct 09, 2023 3:06 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Does anyone here owns a Philips/Fluke PM2525 multimeter? I had a strange current ranging effect and just before opening it I found the fuse with 630mA to be blown. Of course the meter works again after replacing the fuse, but the manual states, that all ranges (not the high current ranges 1A and 10A...
- Mon Sep 18, 2023 5:56 pm
- Forum: Test Equipment
- Topic: The Meme and Jokes Thread
- Replies: 236
- Views: 64696
- Mon Aug 21, 2023 6:41 pm
- Forum: Test Equipment
- Topic: The Meme and Jokes Thread
- Replies: 236
- Views: 64696
Re: The Meme and Jokes Thread
Makes sense to me. :-D Well, we had a home built espresso machine at our booth at Maker Faire in Hannover. https://www.wellenkino.de/557/viewtopic.php?f=8&t=746 That one was effective, though no milk! One day I'll visit the Maker Faire in Hannover, but 700km one way is a lot. More south? Octobe...
- Mon Aug 21, 2023 7:25 am
- Forum: Test Equipment
- Topic: The Meme and Jokes Thread
- Replies: 236
- Views: 64696
Re: The Meme and Jokes Thread
Well, we had a home built espresso machine at our booth at Maker Faire in Hannover.
https://www.wellenkino.de/557/viewtopic.php?f=8&t=746
That one was effective, though no milk!
- Tue Aug 15, 2023 4:10 pm
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099
Re: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
Well, I spent too less money the last weeks, so now I bought me a new toy. This one will complement the shitty R&S FS300 rektum spanalyzer: hp8563e_2.jpg It has already the LCD update and option 8ZE "Refurbished by HP". Mounted on the back is a HP 85620A memory module. Two software pac...
- Fri Aug 11, 2023 9:16 am
- Forum: Test Equipment
- Topic: Gossen T4 K80 R1 - Repair
- Replies: 21
- Views: 7243
Re: Gossen T4 K80 R1 - Repair
I promised to update the schematics. Here is a zipped PDF with the schematics I captured. I suppose there are still minor errors and I didn't validate every components value. GossenT4K80R1.zip The circuit is a little tricky to measure, as there are two error amplifiers with supplies floating on the ...
- Fri Aug 11, 2023 8:14 am
- Forum: Test Equipment
- Topic: Test Equipment Anonymous (TEA) : Discussion and Group Therapy Thread
- Replies: 2969
- Views: 482099