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I was going to attach screenshots from my 11801/SD-32 comparing one of Leo Bodnar's new LBE-1322 pulsers to the calibrator in the 11801.

Seems I'm not allowed to do that. Don't know why or care. I'll simply state the result.

My 11801 calibrator output has a 15 ps rise time averaged over >4096 measurements. I measured 19 ps for my LBE-1322. The calibrator signal proves that the head is faster than the DUT.

If you have an 11801 family instrument which either has a failed or the slow revised model calibrator, this is a superb instrument. You want it!

Have Fun!
Reg

Reg, This grp, no phoots attached to the messages.


Like many other groups.io, please use this preoceedure to post photos

Left hand column>> "photos" section: >>New Album>>name it>>drag or select all photos

We have the older Leo Bodnar 40 pS pulser, no issues use with 500 M or 1 GHz analog scopes.

Note that in 2025, his pulser formats, specs and cost have been updated.



Suggest you ask Leo, at his fine website support:

Cheers,


Jon

Jon,

My post is NOT about testing the rise time of a scope. Its about TDR using Tek sampling scopes.

It is intended for owners of the later versions in the Tek sampling scope family which don't have the 15 ps calibrator. In later models Tek cut corners and only put in a 200 ps pulser. That's a substantial loss of resolution at 5 ps/div. It is an independent review of Leo's new product by a very well equipped and knowledgeable buyer who has the good fortune of having better kit than Leo.

Anyone who has a later member of the family with the 200 ps calibrator now has an alternative for doing TDR using an SD-26. I used my calibrator and a tee on an SD-26 for years before I found a working SD-24. You can see the ringing from the tee, but that's easy to understand. Strictly speaking it should have a 26 GHz splitter/combiner on it instead of a tee to preserve constant impedance. Best one I've got is only 12 GHz.

Scope shots using an 11801 and SD-32 of the new LBE-1322 pulser may be seen here compared directly to the 15 ps pulser in the 11801:



Have Fun!
Reg