Hello, im new. Iv watched EEVblog for years on youtube, and also Marco Reps and Xdevs youtube has me all addicted.
So i bought an 03458-66509 ref board on ebay to power standalone. Iv been searching for all other HP3458A ref bd photos and honestly it looks kinda suspicious to me.
I asked questions about it (not shipped to me yet), no responses yet. He's got alot of random tech for sale that makes me lean a bit more legit.
https://www.ebay.com/itm/276078967233 Via holes are all offset, silkscreen is offset. Both main IC's look weird.
What do you guys think!?
*better photo's if/when it arrives.
I have been blessed with an hp3458A, un-calibrated but great for me(to good for me). Tested with VoltageStandards.com 10-Vref and seemed good.
Some 0.005% resistors i bought were on point as well, i can check the Ebay boards for resistor accuracy.
Im not going to put the ebay board into my meter, just wanted some always on modern reference without yet building one .
I have an GPIB to usb adapter that came with the meter, but im starting green from zero to connect or record anything. I also do not have the meter powered up 24/7.
-William