Siemens Oscilloscope/Waveform Processor - Page 1
Forum section: electronics / repair

author: JKKDev
author_rank: Regular Contributor
timestamp: December 07, 2018, 11:07:38 am
content: Hey thereFirst timer here on the blog so please be kindI've just acquired 2 pieces of electronics history. One being the HP 1715A 2-channel 200 MHz Oscilloscope and another is a Siemens 7KD1044-8AB 4-channel 100MHz Oscilloscope/Waveform Processor(?). Both of them have seen better days and both are DOA (as per ebay listing). I have no doubt that the HP scope will be repairable with its component level service manual however the Siemens one is a doozy.I cannot find even a trace of its existence on the internet. There is an acknowledgement of its existence on a website of a partner of Siemens (http://www.automation-berlin.com/en/siemens-7KD1044-8AB.html) however that is it. I was wondering if maybe I can find a person here that could point me to at least a user manual if nothing else.On a non related note... I was thinking of taking a few photos while I tackle with the repairs of both instruments. If there is any interest in this topic please let me know and I'll gladly put together a blog style post of the repairs.Thanks for staying with me this far and have a nice day

author: capt bullshot
author_rank: Super Contributor
timestamp: December 07, 2018, 11:09:53 am
content: Yes, there're always enough people here interested in repair blogs / stories, of course including teardown pictures

author: dzseki
author_rank: Frequent Contributor
timestamp: December 07, 2018, 11:43:55 am
content: I have a HP 1720A scope here which is the bigger brother of the 1715A, but they are identical in most aspects, so if nothing else maybe I can help a little with that at least.

author: JKKDev
author_rank: Regular Contributor
timestamp: December 07, 2018, 11:54:08 am
content: Quote from: dzseki on December 07, 2018, 11:43:55 amIf you've got a service manual it might come in handy as some of the images in mine are poorly copied and hard to read. Do you know what the main differences are between the two? Thanks

author: dzseki
author_rank: Frequent Contributor
timestamp: December 07, 2018, 12:11:10 pm
content: Quote from: JKKDev on December 07, 2018, 11:54:08 amYes, the 1715A manual is pretty bad, you can easily find manual for the 1722A (275MHz, digital readout) or 1725 (275MHz, 8x10 screen, time interval) both manuals have merits, though they are very similar.If you fail to find these, you can PM me your e-mail so I can send them to you.To my understanding the only difference is around the input hybrid IC, not sure if the IC itself is different, but the application is for sure, there are less legs used in the 1715A, the vertical output (and everything else) is the same however.

author: JKKDev
author_rank: Regular Contributor
timestamp: December 07, 2018, 01:49:09 pm
content: Thanks to CJay we successfully identified the scope not as a Siemens but as a Gould more accuratelly one from the family of Gould DSO 4074 or similar. It appears the name banner from the top of the front pannel was removed/never existed as there is no glue or other residue / shadows present there.Now my question to the people in the know is why would a Gould scope be in a box whose only identifier is SIEMENS, West Germany, Made in England and a product ID that has zero connections to the actual scope. The "Made in England" part might be a hint but I don't know the history/connections between the two so if someone could explain this I'd be really happy.EDIT: After a quick recheck of the stated specifications under the SIEMENS ID the more accurate model is looking to be Gould DSO 4084 (4-channel 800MS/s dual channel, 400MS/s quad channel). I'm getting happier with the purchase by the minute