HP 5005A A6 Pod  - Page 1
Forum section: electronics / testgear

author: Mick B
author_rank: Regular Contributor
timestamp: August 04, 2024, 06:59:54 pm
content: I did it! my HP 5005A is alive. That was not fun, but in the end the 3 coax cables were successfully replace with RG316 and a sheath from an old O2 sensor out of one of my Saabs.After putting it together there were error messages E18 & E15 this turned out to be the ribbon cables connecting the 3 boards together, after reseating them a few times no errors. As far as I've tested is the quick test as far as the test leads go there supposed to measure approximately 100K all 3 are 98.7 ohms winner winner chicken dinner!Now I can get back to testing the HP 8116A's before I was so rudely interrupted by a faulty coax cable.

author: Mick B
author_rank: Regular Contributor
timestamp: August 04, 2024, 07:02:36 pm
content: Hello all, I spoke to soon saying I was finished with replacing the coax cable to the timing pod of the HP 5005A. I read the manual from cover to cover, and it appears some calibration is in order, at least some checking. Just guessing and I was tired, but my comprehension through that manual was only about 30%. I have a lot more reading, and things to look up before tweaking anything in the HP 5005A. I wonder if I have the right gear to even attempt this. HP didn't help using their 5036A Micro Processor Lab and a Pulse Gen. 100MHz with <2ns transition, I am quite sure I don't have these things or even a 300V power supply, and not likely to ever have them. I am hoping I can look at the input compensation and see if changing the coax affected the adjustments. If so, I will need a pulse gen that is fast and adjustable to the likes of HP8007B. any suggestions would be greatly appreciated, it can't cost BIG money either.

author: Tony_G
author_rank: Super Contributor
timestamp: August 04, 2024, 09:16:36 pm
content: Leo Bodnar has a very fast pulse generator that is priced reasonably -https://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=124&products_id=375&zenid=d7c585c1711b14e51112878a16ca6e92That and the other bits for adjustments in Table 1-2 should be all you need (assuming that your repairs are such that they can be adjusted). I have a 5005B around here somewhere if I can help with measurements of that...TonyG

author: Mick B
author_rank: Regular Contributor
timestamp: August 05, 2024, 04:42:58 pm
content: QuoteHi Tony, thanks for getting back to me. I followed your link to Leo Bodnar and the fast pulser <30ps it is sold out, and <40ps is obsolete NA. I also (bear in mind) am really new at this. I was wonderinghow to use just a fast pulse generator like that,the instructions for adjusting INPUT COMPENSTATION Pg 5-1 ~ 5-7 are calling for a generator that has adjustments like an OFFSET VERNIER to bring the comparators into alignment, so to speak. Would you know how to do this just using that Pulser if one comes available?Also, it's my understanding the only difference between the HP 500A & B is the B can be programed, correct? So, you having a working one would certainly be helpful, should I want or need to get into this deeper.Thanks, Mick

author: Tony_G
author_rank: Super Contributor
timestamp: August 06, 2024, 04:31:20 am
content: I bought mine some time ago but never got around to putting it on the bench and testing it out so I can't really comment on the calibration process with any level of knowledge.That said, a quick look at the manual seems to show that you can use any pulse generator that allows you to meet the rise time requirement and has a variable DC offset. I also don't have Leo's generator but looking at his website, I don't think it has a variable DC offset.You might need to keep looking for one. The two requirements that I see, again from a quick look, are <2ns rise & fall times and DC Offset.TonyG

author: Mick B
author_rank: Regular Contributor
timestamp: August 06, 2024, 02:15:15 pm
content: Hello Tony, I just bought a working HP 80007B that is the one they use in the manual; it should be here no later than the 9th. Have you had or calibrated your HP 5005B?I figure getting vintage gear is a good investment, people seem to appreciate it, I like the price curve of HP as compared to say Tektronix's, and I'm very new at Electronics repair. I have some newer digital gear, but the analog stuff is so easy to operate. the only complaints are SIZE and fan noise. anyway, Thanks, for your help.

author: Tony_G
author_rank: Super Contributor
timestamp: August 06, 2024, 05:55:08 pm
content: unfortunately no - I bought the unit because I was looking for a signature analyzer just in case - I never got around to putting it on the bench.When I get back home I can try to dig it out to have a look but that'll be a couple of weeks.TonyG