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Not that I need another scope, but I am offered what I believe to be a good deal, and an opportunity to buy this 7704A that comes with a 7A26, 7B70, and a 7S12 (S-6 & S-52).
I¡¯ve never ever used a sampling plugin before. I wouldn¡¯t even know how to see if it even works properly, nor where to start¡­
Could someone tell me how to check whether it¡¯s ok. The guy¡¯s bringing the scope over this evening. Asking price is 280€ (Approx $315) for the whole package. Good deal?

Thanks

The 7S12 with S-6 adn S-52, if working, are about worth that, so in my book, yes, seems a good deal. Others might feel differently.

Richard Steedman is in your time zone, and got me started with the 7S12, and S-52. But I shouldn't speak for others - he may not be available. If you can stand the time difference (I'm in San Francisco) I'm glad to share what I've learned. But I am still in a learning phase myself.

I can be reached via my Gmail account with the same username as well.

Good luck!
Dave

Thank you Dave.
Hopefully he¡¯ll see the post¡­
I¡¯m about 12h away from the guy showing up with the scope.

Take a look at
Connect the S-6 to the pulser.
Set time/Div to 50ps, distance to zero, vertical to 100 mV, Scan to REP, locate off (button in), scan speed high (knob to the right), high resolution off (button out).
Locate the trace vertically with the offset knob. If everything works, you should be able to bring the step into view with the FINE (ZERO SET) control.

On Wed, Dec 22, 2021 at 09:21 PM, Peter H wrote:

Take a look at
Connect the S-6 to the pulser.
Set time/Div to 50ps, distance to zero, vertical to 100 mV, Scan to REP,
locate off (button in), scan speed high (knob to the right), high resolution
off (button out).
Locate the trace vertically with the offset knob. If everything works, you
should be able to bring the step into view with the FINE (ZERO SET) control.

Thank you Peter, but your link links to no image¡­

On Thu, Dec 23, 2021 at 11:34 AM, Stephen wrote:

Thank you Peter, but your link links to no image¡­

You probably included the ":" at the end of the link. Enter the link without it and the link works.

Raymond

On Thu, Dec 23, 2021 at 01:17 AM, Raymond Domp Frank wrote:

You probably included the ":" at the end of the link. Enter the link without
it and the link works.

Raymond

Probably. I just clicked on it¡­
Thanks

On Thu, Dec 23, 2021 at 06:45 AM, Stephen wrote:

I¡¯ve never ever used a sampling plugin before. I wouldn¡¯t even know how to
see if it even works properly, nor where to start¡­

You have to be aware that the 7S12-set that you describe is a TDR unit, not a general purpose sampling 'scope plugin. The S-6 does not supply a trigger signal to the 'scope. A sampling 'scope needs a trigger signal, like any other 'scope. Either replace the S-6 with a sampling plugin having internal trigger pick-off, like an S-2 or an S-4, or use a Trigger Recognizer (S-53), replacing the pulse generator.
Also, be aware that sampling 'scopes are not as easy to operate and much more vulnerable to damage (static electricity) than ordinary 'scopes. Leave the input pp signal (DC+AC) below 1V for best results. When using the S-6 as a regular 'scope input, you'll need to terminate the S-6 into 50Ohm (SMA terminator).

Unless the 7S12 set is completely operational, I wouldn't consider €280 a good price.

Raymond

Raymond,
That¡¯s exactly why I¡¯ve asked for advice on how to do an initial check to see if EVERYTHING is functioning properly.
If¡¯s it¡¯s not fully operational, what would you consider a good price?

On Thu, Dec 23, 2021 at 02:19 PM, Stephen wrote:

If¡¯s it¡¯s not fully operational, what would you consider a good price?

Repairing a complete 7S12 in TDR setup often isn't straightforward, especially with limited equipment and no spare parts. Therefore, a unit that is not fully functional would only have spare parts value.
Depending on technical and cosmetic condition, I'd consider €100 for the 7704A + 7A26 + 7B70 a reasonable price, with €150 being the absolute limit for an impeccable unit.

Raymond

Thanks Raymond.

Notes. I¡¯ll see how it turns out this evening.

To my knowledge, and per a quick reading of the manual, the 7S12 doesn't trigger from the sampling head (left-hand head slot), only from the right-hand head which can be a pulser (for TDR), or an S-53 Trigger Recognizer.

Sorry, I also added a redirect on the wiki so clicking the link will work now.

On Thu, Dec 23, 2021 at 04:24 AM, Peter H wrote:

Sorry, I also added a redirect on the wiki so clicking the link will work now.

Thanks. I printed it out for quick reference this evening when I do what you said.

On Thu, Dec 23, 2021 at 04:23 AM, Peter H wrote:

To my knowledge, and per a quick reading of the manual, the 7S12 doesn't
trigger from the sampling head (left-hand head slot), only from the right-hand
head which can be a pulser (for TDR), or an S-53 Trigger Recognizer.

Does that mean it can trigger from a S-52?

BSM or MB connector are apparently very hard to come by. If the unit works as intended, should I replace them with SMA ones?

MB connectors available at:

On Thu, Dec 23, 2021 at 05:09 AM, <dave.sanders@...> wrote:

MB connectors available at:

Unfortunately all the male connectors I¡¯d need are sold out. And it¡¯s getting more and more expensive to have stuff shipped from the US nowadays. Unfortunately, it¡¯s not really worth it to have anything shipped to Europe if you can do otherwise. Shipping costs and taxes are now often more expensive than the items themselves.

But thanks anyway.

On Thu, Dec 23, 2021 at 04:23 PM, Peter H wrote:

To my knowledge, and per a quick reading of the manual, the 7S12 doesn't
trigger from the sampling head (left-hand head slot), only from the right-hand
head which can be a pulser (for TDR), or an S-53 Trigger Recognizer.

You're right. I checked a physical 7S12. The trigger pickoff socket (J101) at the back of the left compartment ends in ... nothing. No cable, no connection... The only way with a 7S12 is a trigger recognizer (S-53) in the rightmost compartment, where normally the pulser lives.

Raymond

On Thu, Dec 23, 2021 at 04:39 PM, Stephen wrote:

To my knowledge, and per a quick reading of the manual, the 7S12 doesn't
trigger from the sampling head (left-hand head slot), only from the
right-hand
head which can be a pulser (for TDR), or an S-53 Trigger Recognizer.

Does that mean it can trigger from a S-52?

The Pretrigger Out on the S-52 is coming from the pulse output, not from the S-6 so, no.

Raymond