开云体育

On Sat, Jan 18, 2025 at 12:55 AM, Jean-Paul wrote:

Re. this statement:

The transient rise time is important but especially the aberrations, eg
percent overshoot, ringing, etc.

and this one:

The PG506 fast rise is OK, and older Tek fast pulse adapter (TD, Avalanche)
and Jim Williams Lin Tech can be used.

How do you reconcile those statements? I agree with the first, but not entirely with the second. PG 506 generates a relatively clean step but isn't very fast, TD is fast and produces a pretty clean step if constructed and terminated well but unless I'm mistaken, the JW (avalanche) pulser is fine for slew rate but is far less suitable for being able to see and for correcting aberrations than a step generator, like the Leo Bodnar or a good TD pulser. With a JWP, you won't see many aberrations that are there. Did you read my post earlier today about the JWP and can you comment on it?

My standard is the Leo Bodnar 40 pS pulser, fortunately have two of the BNC
model, USB powered
10 MHz. Highly recommended!

I also use the Leo Bodnar 40 ps pulser and agree with your recommendation.

To have best results, use no cables, buffer pulser output with a Mini-Circuits
HAT-20 20 db 50 ohm BNC attenuator (to minimize reflections from VSWR of the
scope input).

Of course, no cables!

That setup has worked for 2465/7/B and also 1 ghz scopes and plugins like
7104/7A29, to optimize the vertical transient response.

I've done the same with several 2467/67's, 7904(A)'s, and my two 7104's.

Note that transient response tweaking is in steps of interacting adjustments,
affecting different time scales. The procedure should be repeated a few time
for optimal results.

I love doing that, seeing gradual improvement. Very rewarding!

Raymond