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Resistors mean business when they have certificates

🕑 Added 2018-08-15 18:21:38 +0000 UTC

Comments

Jason Pepas

I maintain a set of indexes of the questionable ebay resistors <a href="https://ssl.pepas.com/hifi/" rel="nofollow noopener" target="_blank">https://ssl.pepas.com/hifi/</a> no links unfortunately, so you have to copy and paste the description of the resistor into ebay search

Marco Reps

Yep, it's a voltage source that tries to change very little over temperature and time.

Jan Ka

So from the linked article I gather that these are part of a reference voltage source to calibrate your instruments with?

Marco Reps

Some call em the greybeards ... <a href="https://xdevs.com/doc/xDevs.com/RBOX/rbox_r2_i.jpg" rel="nofollow noopener" target="_blank">https://xdevs.com/doc/xDevs.com/RBOX/rbox_r2_i.jpg</a>

Marco Reps

Thanks for the box ;) If I ever CNC machine enclosures for the references, I'll send you one! But Aluminium is probably not going to be very good on it's own, needs another layer of thermal insulation without any electrical properties so that it can touch the kx board. Mineral wool?

Marco Reps

Me neither ... but it seems like a good idea to assemble the references and leave em turned on for however many years it takes to obtain a 3458 😂

Marco Reps

Yep! There are some questionable but significantly cheaper sources on eBay <a href="https://www.ebay.com/itm/121032470224" rel="nofollow noopener" target="_blank">https://www.ebay.com/itm/121032470224</a>

Roger Koch

Did you order these direct from Vishay? I am playing with the double LM399 board from Xdevs because there was no way in hell to get the resistors for the LTZ. But i do have 2 spare double 399 boards from OSH park, if you are intersted.

Jamie Magin

This reminds me, I need to build one or two of the KX ref that I have boards and LTZs and most of the other parts. Still don't really have a better multimeter than an HP 3457A and an HP 3456A, but it might be fun.