| Electronics > Repair |
| HP 3478A: How to read/write cal SRAM |
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| MarkL:
--- Quote from: Pete2 on November 23, 2018, 05:30:56 am ---coromonadalix, thanks for the tip. Any way to know which ones are fake? Also, do fake ones work at all? Almost all of them are listed as "new in box". If some of them are fakes, how to tell apart... --- End quote --- It's usually hard to tell from photos and descriptions, but you can be pretty much guaranteed it's counterfeit if coming from China or Taiwan. There's a lengthy thread on it here, and someone noticed that there's a lack of metal shielding on the fakes: https://www.eevblog.com/forum/testgear/flood-of-new-agilent-82357b-gpib-usb-adaptors-on-ebay-the-real-deal/msg983752/#msg983752 The fakes also have poorly spelled Certificates of Authenticity (COA), non-existent serial numbers which can be checked on the Keysight web site, mismatched serial numbers on the box/certificate/unit, and really terrible soldering/rework on the inside if you open it up. All is detailed in that thread, including someone who did an unboxing of a real one to show what to expect. Some people have had success using the fakes. But many are unstable, and some just don't work at all. I don't recall reading that anyone didn't get a refund after reporting a counterfeit. |
| steve1515:
In case anyone is interested, I decided to create my own program to read and write the calibration data from the HP 3478A. It also displays the gains and offsets for each range from existing calibration files. Program Download: https://github.com/steve1515/hp3478a-calibration/releases Instructions & Source Code: https://github.com/steve1515/hp3478a-calibration Hope someone finds this useful. :-DMM |
| ErnieW:
Hi, I am new to the blog and have just acquired a 3478A to complement my range of test equipment (which is mostly for rf measurements). I opened it to check the battery which is still 3,4V. But it is always good to backup the cal values - just in case. Unfortunately the above program requires a Prologix GPIB Interface, which I do not have. I have a hp 82357B GPIB - USB interface. As I am not a programmer and steve1515 has released his source code, maybe someone in the group can modifiy his code to work with my interface. Probably this would also be useful to other members. Regards Ernst |
| Miti:
Check reply #44. That program should work with your adapter. Thanks to member pigrew. |
| ErnieW:
Thanks, this worked for me. But would be nice to see an interpretation of the cal values. :) |
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