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Refurbishing a Tektronix TDS7104 Oscilloscope

tomverbeure.github.io

31–40 of 70 posts

Re: Refurbishing a Tektronix TDS7104 Oscilloscope

#31
10 GS/sec is very impressive as far as I'm concerned! One sample every 20mm or so at typical transmission line speed.

That said, anything with a floppy drive scares me because it undeniably indicates how old it is. My SDS7102V is no Tektronix, but an honest 1 GS/sec and at the time, under $200 on eBay.

Re: Refurbishing a Tektronix TDS7104 Oscilloscope

#32

Earlier quoted context omitted.

My 54825A had a power-up problem: if you unplugged the AC cord for a few hours, pressing the front-panel button wouldn't power on the scope. But if you plugged in the AC for about 5 minutes, it would work fine again. That sounds like an easy thing to fix, but the whole power-on architecture was a baffling Rube Goldberg device from the button on a small support PCB to the front panel PCB to the PC plug-in card to the…

There are exceptions to the "Winscopes" from the same era in the 1 GHz+ space (RTOS like VxWorks but with Ethernet and modern goodies) that are not HP/Tek/R&S, but I'm not listing them because I'm out on an active hunt for one ;-)

> not HP/Tek/R&S

That doesn't leave a whole lot of alternatives, Mr Lecroy.

Re: Refurbishing a Tektronix TDS7104 Oscilloscope

#33
post #24

A bit ago a semi-retired guy came back to help with some stuff including debugging serial ports. It was very cool to see him fiddle with the knobs and be like "oh those squiggles look good" "no that doesn't look right" etc. https://i.imgur.com/R5aEXbq.jpeg Meanwhile total mystery to everyone else how to operate/interpret the machine but a lot of fun

One totally needs a 500 MHz oscilloscope to debug a kHz range serial port signal! :-)

Family and friends aren't impressed by experiments measuring C either...

Re: Refurbishing a Tektronix TDS7104 Oscilloscope

#34
post #2

Flebay has some used ones around $1.5k. I wonder how much this model MSRP brand new? Either way, $300 is a steal!

I think they sold for $60k back in the early 2000s.

This blog post shows a list price of $24,490 for the base model without options: https://www.jhongelectronics.org/2024/01/tektronix-tds7104-f....

Re: Refurbishing a Tektronix TDS7104 Oscilloscope

#36
post #2

Flebay has some used ones around $1.5k. I wonder how much this model MSRP brand new? Either way, $300 is a steal!

I think they sold for $60k back in the early 2000s.

Just wait until it needs a repair, and they tell you it's no longer being serviced. Been there.

This is one of the cases where it might be better to lease it.

Re: Refurbishing a Tektronix TDS7104 Oscilloscope

#38

Earlier quoted context omitted.

There are exceptions to the "Winscopes" from the same era in the 1 GHz+ space (RTOS like VxWorks but with Ethernet and modern goodies) that are not HP/Tek/R&S, but I'm not listing them because I'm out on an active hunt for one ;-)

> not HP/Tek/R&S That doesn't leave a whole lot of alternatives, Mr Lecroy.

...sorry, not HP/Tek/R&S/Lecroy ;)

Re: Refurbishing a Tektronix TDS7104 Oscilloscope

#40

Yeah 1 GHz is nice, but that tiny 200 MHz Siglent is going to be much more useful in practice for most things. Speaking of boat anchors, I'm trying to get my company to buy a DSA91304a (13 GHz scope with SERDES debugging). ~$44K with all the options, but still Windows-XP. The Windows-7 ones unfortunately don't have the options I want. Maybe there is a hack..

I have a 1.5GHz TDS7154B in addition to my 200MHz SDS1204 specifically to measure power rail noise with a low noise probe.

You just can’t characterise power rail noise well with less than 500MHz of bandwidth.

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