HP8591E battery dead - who wants to share calibration data? - Page 1
Forum section: electronics / repair

author: Greybeard
author_rank: Frequent Contributor
timestamp: May 20, 2024, 04:09:07 pm
content: I got an HP8591Ewith dead NV-RAM battery (CR2477) and lost calibration data.The last calibration sticker is from 2022 and now, barely 2 years later, the battery is flat (~0.3V).Of course no one saved the calibration constants before the battery was flat -> shit happens...Unfortunately, I don't have calibrated RF level meter and RF generator available to try a self-made calibration.I found calibration data sets of two HP8591Ain this thread:https://www.eevblog.com/forum/repair/battery-replacement-in-hp-8591a/msg5501665/#msg5501665Both calibration data sets are not much different, so I'm hoping I can find some data sets for the HP8591Ethat I can compare,and if they are close, I could average the values and use them as default values for the lost data device.I hope someone would like to help me.

author: Greybeard
author_rank: Frequent Contributor
timestamp: May 21, 2024, 04:41:53 pm
content: Maybe a user of an HP8591E who has not saved his cal constants yet, would like to take advantage of the opportunity to do it now and like to share the values?

author: minolta
author_rank: Contributor
timestamp: May 21, 2024, 05:01:07 pm
content: Only one what you need is flatness data and reference oscilator adjustment (this is possible to do using known frequency, counter, etc.)..I am sending you a printout of flatness (screen without signal) and you can write these flattness values manually in the service menu.The another calibration constants are generated by autocalibration sequences and you must only connect calibrator output and RF input.

author: Greybeard
author_rank: Frequent Contributor
timestamp: May 21, 2024, 06:12:55 pm
content: Thanks Minolta,QuoteI'm not quite sure how to read the values from your plot...Is that the noise floor?How did you generate the plot?Don't you have a record of your SA in this format:

author: Greybeard
author_rank: Frequent Contributor
timestamp: May 22, 2024, 05:14:44 am
content: Added empty forms and 'how to backup':

author: 807
author_rank: Frequent Contributor
timestamp: May 22, 2024, 01:06:00 pm
content: I backed up my correction constants of my 8591E last July.Attached appropriate PDF pages below.

author: Greybeard
author_rank: Frequent Contributor
timestamp: June 03, 2024, 07:33:00 am
content: Thanks for your calibration constant sets, 807!I was actually hoping to get a few other sets to compare.

author: 807
author_rank: Frequent Contributor
timestamp: June 03, 2024, 03:25:50 pm
content: Are you a member of HP-Agilent-Keysight-equipment Groups.io?You might get more replies to your request on there.https://groups.io/g/HP-Agilent-Keysight-equipment

author: Greybeard
author_rank: Frequent Contributor
timestamp: June 04, 2024, 09:17:07 am
content: Quote from: 807 on June 03, 2024, 03:25:50 pmI've tried to join the group about 2 weeks ago, but when I try to access I always get the message:QuoteI don't know if something went wrong or if I just have to wait...I can read single messages (posts) but cannot send posts by myself.Is it a paid service?

author: pienari
author_rank: Regular Contributor
timestamp: June 04, 2024, 02:31:56 pm
content: I checked...This is group is too large for a free accountBut i own 8591E and i need to check the battery.

author: 807
author_rank: Frequent Contributor
timestamp: June 05, 2024, 06:57:21 pm
content: Quote from: Greybeard on June 04, 2024, 09:17:07 amI've been a member for many years. I can't remember how long it took to get my application approved. 2 weeks sounds like a long time to wait. Perhaps the administrator is on holiday or something?You don't need to pay anything. It's free. But the admins have to pay io groups for server space.

author: 807
author_rank: Frequent Contributor
timestamp: June 05, 2024, 07:01:45 pm
content: Quote from: pienari on June 04, 2024, 02:31:56 pmThe admin of the group has to pay for server space, but the members don't need to pay anything. Some admins of certain groups ask members for voluntary donations every once in a while to help with server fees. I can't remember if the HP group have ever done this.

author: Greybeard
author_rank: Frequent Contributor
timestamp: June 06, 2024, 01:35:31 pm
content: QuoteIt was my fault.Not only did I have to click on the link in the group's confirmation email, I also had to email back a response with my request, which I wasn't aware of.