HP 8482A -HP 5347A - Page 1
Forum section: electronics / testgear

author: frantisek
author_rank: Regular Contributor
timestamp: September 05, 2024, 11:21:34 am
content: Hello, colleagues. Please advise me if I can use the HP8482A sensor for the HP 5347A counter. Thank you very much!

author: Tony_G
author_rank: Super Contributor
timestamp: September 05, 2024, 03:30:13 pm
content: You should be able to - I suspect that the reason it isn't listed in the manual is that the 5347A is a "20Ghz instrument" and the 8482A is only a 4GHz sensor (from memory, somewhere around that as compared to the 8481A which goes to 18GHz).The connection is the same but I haven't used the 5347A (I think I have a similar instrument around here somewhere but I don't use it) so there might be something specific about the calibration factor entry but that should be fairly easy to overcome by just putting in a temp value if it needs all them to run.TonyG

author: frantisek
author_rank: Regular Contributor
timestamp: September 06, 2024, 09:36:55 am
content: Hey. Thank you very much and hello!

author: frantisek
author_rank: Regular Contributor
timestamp: September 08, 2024, 08:13:17 am
content: The problem is that the HP 5347 probes are selected by a DIP switch on the back of the instrument and the calibration constants for the types listed in the manual are stored in memory. So when the probe would measure, at best, it would measure with an error because those constants are quite different. Ideally I would try it, but I don't have that option. I'm faced with the decision of whether to buy the instrument or not.Translated with DeepL.com (free version)

author: Tony_G
author_rank: Super Contributor
timestamp: September 09, 2024, 02:55:32 pm
content: Interesting - I checked and I do have a 5347A that I picked up as part of a pallet of auctioned test gear - I've never used it as I have a number of the 43X and E441X meters that I use on the bench and a 5351 in the rack for frequency.In terms of the connection, the electrical characteristics are compatible - All the 848X sensors have the same connection and typically the differences are handled in the calibration factor table that you enter into the power meter.This was strange so I grabbed the manual from the web and took a look and as far as I can tell there isn't a way to do specific calibration factors, which means the section in the manual on "precision power measurements" isn't really "precision".So if you already have a power meter that works with your 8482A then I'd just stick with that - ALternatively you could just do the math to convert from the standard 8481A cal factors in the 848X manual to the ones specifically on your 8482A to get a more precise reading.I've attached the calibration factor section from the Keysight calibration report for one of my 8481A's if that is helpful.TonyG

author: frantisek
author_rank: Regular Contributor
timestamp: September 09, 2024, 03:45:19 pm
content: Hey, Tony! Thank you very much. I will try to insert a table with references to my probe. I just don't know how I would calculate it... Thank you for your extraordinary helpfulness! You have very nice videos. One more question. Do the wall type probes all have the same calibration factors?

author: Tony_G
author_rank: Super Contributor
timestamp: September 10, 2024, 03:08:18 am
content: HP has a good AppNote on this - Too large for me to attach directly but I've created a searchable PDF for you that you can get from here:https://1drv.ms/b/s!Amqar8_XQ9Uzk841shhAVmjgOQ2-zg?e=dULGrHIf your cal factor is 90% then the power sensor is reading a value 10% lower (i.e. 90%) of the actual value. You could rough out a correction by using the standard 8481A factors and your actual factors in an Excel spreadsheet. That's probably good enough for hobbyist work (in that if you needed more precision then you should really be acquiring the correct hardware).I'm not sure what "wall sensors" mean but I assume that this is a translation issue as I think you're translating into English for the forum.Thank you for the kind words regarding the videos - Appreciate it.TonyG

author: frantisek
author_rank: Regular Contributor
timestamp: September 12, 2024, 08:37:06 am
content: Thank you very much!

author: Tony_G
author_rank: Super Contributor
timestamp: September 13, 2024, 12:41:05 am
content: Happy to help - Good luck with whatever you choose to do.TonyG