I sometimes do multimeter reviews on the youtube channel and would like to have a resistance reference box to use when assessing the accuracy of these meters. They are usually cheap, low resolution meters (up to 4.5 digits) so I don't think I'm in the metrology type measurements area on the same principle where RF guys consider sub Ghz signals DC
but still I thought this is the best place to ask. I also have two bench meters Agilent 34401A (6.5 digits) and HP 3478A(5.5 digits) and it would be great if I was able to keep these in check as well with this reference box.
Vishay sent me 3 resistors from their VHP100 series as free samples, they are 1K, 10K and 100K. The plan is to use an aluminium enclosure, drill holes for the binding posts (4-wire arrangement) and connect the terminals using some copper silver wire, by soldering on the ends of the binding posts.
Then I would have the VHP100 resistors, suspended and soldered in between the solid silver copper wires. I would be soldering them at least 10mm away from the can and I would also try to heatsink them while soldering to minimize the thermal shock applied to the resistors.
I've looked for good quality binding posts and I know the
Pomona 3770 (Gold plated Tellurium Copper with polycarbonate insulation) is often referred to on this metrology sub-forum but unfortunately they are too expensive at $12.5 USD + shipping + tax, considering I would be needing 8pcs total. So instead I would like to use the
Hirschmann 935 980-811, these are gold plated brass connectors and I got a set of 10 for about $32.
I've read several threads on this forum, talking about the issue of EMF (Thermoelectric voltage) which appear at the junction of dissimilar materials however I would like to know how would this issue affect me with my particular build. What kind of errors am I expecting to introduce into my measurement if I use those Hirschmann gold plated brass binding posts in a 4-wire measurement setup?