Electronics > Projects, Designs, and Technical Stuff

Usefulness of different TDR designs?

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rhb:
Thanks.  I also queried TekScopes and it's not worth messing with a 1502. 

I've ordered a custom 1 MHz version of Leo Bodnar's 10 MHz square wave generator specifically for TDR with a DSO.  I'll stick to that.

texaspyro:

--- Quote from: rhb on April 20, 2019, 12:43:37 pm ---Thanks.  I also queried TekScopes and it's not worth messing with a 1502. 

--- End quote ---

Why not?   I have had over 100 of them and they seem to work quite well.

rhb:
Dead ones are rather unrepairable.

Why have you had over 100?

texaspyro:

--- Quote from: rhb on April 20, 2019, 05:47:20 pm ---Dead ones are rather unrepairable.

Why have you had over 100?

--- End quote ---

The CRT based TDR's are quite repairable,  the only ones I could not fix had broken CRTs.

I have a TDR fetish...  :-DD  Actually, at one time, I got a reputation for being able to repair them and they just wandered my way.  Also bought a couple of large-ish lots of them.  I still have over 50 Tek TDRs (1502, 1503, 1503A, 1503B... alas no 1502A/B's)... all calibrated and working.   

The 1502A/B units are VERY expensive.  Apparently they are used in airplane maintenence and are the only approved device for lots of applications.

rhb:
Yeah, the FAA is a bit weird about airplane servicing procedures and doubtless not enthused about qualifying a new device.  The HP 34401A stayed in production for many years because it was specified as a requirement for a lot of work.

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