HP 70820A Transient Analyzer custom keypad - Page 1
Forum section: electronics / rf-microwave

author: neklid
author_rank: Newbie
timestamp: March 05, 2023, 04:10:18 pm
content: Hello to all!I would like to ask you: could you, please, advise me where to find the HP 70820A Transient Analyzer custom keypad? I know - it looks like a brave question, but maybe someone of you might have some spare one...Or another possibility: are you able to offer other keypads for the HP70004A system to assemble the keypad with keys very close to transient analyzer one?With many thanks,Karel

author: coppercone2
author_rank: Super Contributor
timestamp: March 05, 2023, 06:51:55 pm
content: Find the part number for the key and search, I seem to recall that someone was selling them for ~8$ each lolI did not take my 70000 apart, but if its anything like the keys I am thinking of, if you ultrasonic them in soap water and then lubricate with like teflon silicone grease they do work alot better. I got rid of my sticky keys and only needed to buy 2 replacement keys for a similar keypad.

author: Chat GPT
author_rank: Contributor
timestamp: March 10, 2023, 10:48:09 am
content: there are several places you could try to find the keypad:Online marketplaces: You may be able to find the keypad on online marketplaces such as eBay or Amazon.HP resellers: You can check with HP resellers to see if they have any spare parts available.Electronic component suppliers: Some electronic component suppliers may carry the keypad or similar keypads that could be used as a replacement.Regarding your second question, it may be possible to find keypads for the HP 70004A system that have keys that are similar to the HP 70820A Transient Analyzer custom keypad. You could try contacting HP or a reseller to see if they have any recommendations for compatible keypads. Alternatively, you could try searching for third-party keypads that are compatible with the HP 70004A system.

author: fourierpwn
author_rank: Regular Contributor
timestamp: March 18, 2023, 07:01:59 am
content: FWIW, a photo of the keypad you're after is attached.As these are hard to come by, one possible alternative is to build a soft front panel GUI in something like Python and use the GPIB (HP-IB) to control the instrument.Here is a link to the 71500A MTA programming manual:https://userequip.com/files/specs/1495/HP%2071500A%20Programmer's%20Guide.pdf, which presumably (/hopefully) has the same commands as the 70820A.

author: fourierpwn
author_rank: Regular Contributor
timestamp: March 18, 2023, 07:02:38 am
content: Rear side photo of the keypad attached.

author: coppercone2
author_rank: Super Contributor
timestamp: March 18, 2023, 07:29:22 am
content: i don't know those switches.Stuff like that makes me want to learn proper plastic welding lol, or god forbid mold making for engineering grade plastic resin castings, 3d modeling and micromachining and casting to replace some 10 cent piece of plastic.Haha, I would make a external bracket that supports a new key pad over that if I really had to

author: fourierpwn
author_rank: Regular Contributor
timestamp: March 18, 2023, 09:46:12 am
content: Quote from: coppercone2 on March 18, 2023, 07:29:22 amEven just finding a compatible keypad and sticking new labels on the keys would work, heck even write them on with a marker. Something like this should work:https://www.ebay.com/itm/323787639216?epid=1100556372&hash=item4b633f49b0:g:mSsAAOSwKxlcwDzb&amdata=enc%3AAQAHAAAA4N0c46r1mA4rsCyoTqnn5uVRwpm7g7LxDKbGIAPwXx%2F0Vh2I%2FxBVYtxqEf8JlgdJ6TB0e9dGxpFEFRlgxpIwTbb%2BxncP5JSQ8CGmlU8GFadLsUZJvDfpENrIAkoceAsWxjFU3rrsTIid%2FQFiKtLaLmqn%2BZnPVLxMdQYCn1%2Br%2FSAUlQq2dGGtOSjnmXhyUh4ZRc%2B%2Fs4eX4%2FzLTiETnKSEWk%2BgIFVDXdsGAhrn7DRmsdRR5qp9r1kzh%2FNxgo96RPwP6dCwqTBnWRVTDjpTVTaQJcHSBUlSWy3IVXJHkMI4FQnW%7Ctkp%3ABk9SR7SXx8HeYQThe concept behind these keypads was actually patented:https://patents.justia.com/patent/5150118(link to the full patent is available on the groups.io page, for members)