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Test Equipment Anonymous (TEA) group therapy thread

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tggzzz:

--- Quote from: factory on July 11, 2022, 06:34:33 pm ---Might have a go at the mA source if it doesn't go stupid high.

--- End quote ---

If it is like the Time voltage source I had for a while, it has lots of internal skeleton pots.

With enough fettling you can select the values which suit the instrument you are calibrating.

tggzzz:

--- Quote from: AVGresponding on July 11, 2022, 05:08:55 pm ---Now go and sit in the corner and think about what you've done.

--- End quote ---

Confused one enclosure with too many wheels and too few wings with a similar enclosure?

simba15:
So I'm not much of a TEA yet but I think its started.

~70 vintage scope probes.
P6139 500mhz*
P6137 400mhz*
P6122 100mhz 10:1
P6109 "                 "
P6105 "                 "
P6101 10mhz 1:1

All but the ones with * are available for an extremely good deal just message me if there in interest before they hit the bin.

factory:

--- Quote from: m k on July 11, 2022, 01:00:14 pm ---
--- Quote from: factory on July 10, 2022, 07:44:35 pm ---Well the intermittent display fault has returned to my HP 54615B, trouble is after the second power up, the Hsync/Cal signals don't stay borked for long enough, to see if they are failing at the same time as the display, the signals are correct before the CRT fully warms up and the picture appears.  |O

Hsync & cal signals measured, before they quickly corrected themselves to 19.72kHz (Hsync) & 1.2kHz (probe cal).


I can't find the "any" key.  :-//


David

--- End quote ---

Is there warmer than usual?

Our freezer has removable shelves.
Pretty optimal for cooling bigger things.

80Mhz clock and 1/4 slower sync.
How is this clock generated?

A far fetched.
Sort of direct lines out of the machine, says xDevs 54600A schematics.
Pages 22-23/125 there have +5VF_Core, its buddy +5VF_Pad is clipped but component numbers are still present.
Can you show your version of them some cold spray?

--- End quote ---

I guess it was a little bit warmer when I acquired it (Jan 2021), it hasn't been used much due to this fault, when last used in December, it required about an hour warm up time, before the horizontal display would lock.

Temperature was around 18°C to 23° (depending which crap thermometer I look at) in the workshop when I checked over the weekend. I've no freeze spray ATM and our freezer sleeves are the plumbing, i.e non removable unless you want to destroy it.

Both the HP 54600A & 54654N use a custom IC (Foxy for 54600A & Jackal for 54654N) to provide the H & V Sync signals and the probe cal signal is divided down from the H-Sync by a 74393, the custom IC has a 40MHz clock input, could check this in the future.





I have to thank whoever posted the 54654N CLIP, as the part # of the Jackal IC is the same one used in my 54615B, around it is the 40MHz oscillator & 74393 IC.



David

BU508A:

--- Quote from: AVGresponding on July 11, 2022, 05:08:55 pm ---
--- Quote from: mnementh on July 11, 2022, 03:27:09 pm ---Yeah, that's why the wheels flip out a la James Bond's TR7. Too bad these pontoons don't self-deploy like the TR-7's diving planes;

mnem
--- End quote ---

Dear Mnem,

This is a Lotus Esprit S1:


And this is a Triumph TR7:


Now go and sit in the corner and think about what you've done.

--- End quote ---

And this is a Fiat X 1/9 (spoken: Fiat X one nine):



Edit:
Yoko Tsuno, a japanese electronic expert (comic written by Belgian Roger Leloup since the 70s) drove also a X 1/9 (here in Wuppertal with a plate from Switzerland):

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