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I am frustrated by the lack of schematics for these. I'd like to get one or more blown heads at a reasonable price to reverse engineer the circuit. I'm in AR, USA. If someone has already done this, a link to the schematic and hybrid photos would be even better as it would save me work.

My primary objective is to understand the reflection and transmission responses. I was looking at the 2-way reflection between the calibrator and an SD-26 input connected by a 30 cm section of RG402 today when it occurred to me I'd been dealing with similar traces for 37 years.

I'm a retired PhD level reflection seismologist and programmer. So writing software to correct traces extracted from a CSA803 or 11801 for sampling head errors is routine work whether they come from the RS-232, GPIB or Centronics ports. A schematic with trace lengths is not required, but it makes it a lot easier. Normally I have had to deal with the general case of knowing nothing. My job has been to predict what the drill bit and logging tools will find based on the reflections.

My goal is a piece of FOSS software that will remove the instrument errors and give an accurate image of the input of a 10 ps rise time step into ans SD30 or SD-32. While not all that hard, it's not trivial either. There are a lot of subtleties which must be handled correctly.

I currently have two SD-22 and four SD-26 heads. I'm also looking for working SD-24 and SD-32 heads at a reasonable price.

BTW I won't turn my nose up at other dead electrical sampling heads, but I'm not ready to deal with the optical to electrical convertors. One step at a time.

Thanks,
Reg

Hi Reginald,

Maybe you can start with the Patent Papers. I have uploaded them in a separate TekScopes Folder:

/g/TekScopes/filessearch?q=patent+papers

Enjoy,

Egge Siert

Egge,

I got the patent papers. Thanks.

I'm also looking for a working 11801 A6 calibrator unit, Tek # 657-0058-00. With two calibrator units, the head and calibrator errors including reflection and transmission terms are algebraically separable by measuring two channels with both sources. I should be able to drive the A6 using the front panel internal clock output and, hopefully, just external power.

I'm not wildly enthused about taking apart a working instrument just to reverse engineer the A6 connections, so if anyone knows anything about the J91 connector & J17 cable mentioned in the service manual I'd really appreciate the information.

Thanks,
Reg

Hi Reginald,

Hakan Hintze has build a Stand Alone Pulser with this 11801/11802/Early CSA803 Hybrid:



Enjoy,

Egge siert

Does anyone know if the SD-24 has a pair of the same modules as the internal calibrator inside or if they integrated the same circuit into the input module?

What are the chances that a dead SD-24 has salvageable pulse generators?

I don't know about the modules, but from the picture on tekwiki, the substrates are likely mounted with adhesive, and therefore virtually impossible to remove intact, especially in a complex assembly like that. They might even be soldered down if they needed more thermal conductivity or grounding.