Last Friday we both went to the university department he had worked for.
We had a 3458A in there, 5 years old and never calibrated since.
We measured 10,000 485 kOhm and 10,000 491 kOhm.
By comparing to a Vishay VHP in 10k my friend had measured at work with his annually calibrated 3458A we were able to determine that the 3458A at university was reading roughly 16ppm too high.
But even then, the real value of your resistors would rather measure an adjusted 10,000 325 kOhm and 10,000 331 kOhm.
I just measured them on my 34401A that I adjusted to PTB specs at the maker fair and they were both at 10,000 34 kOhm.
try
* The 3458A had been calibrated in the voltage ranges shortly before the fair but not in the Ohm ranges.
Try:
So what your saying is - You really don't have a way to measure the resistors on on any real calibrated equipment, you don't have access to a single true resistance standard, and after 9 months of shipping and unknown storage / weather conditions - tell us all exactly why would Edwin be concerned? Even with your very rustic measuring technique you still are within 35ppm. Or whatever hit or miss technique you've used. Not bad.
Have you once looked at your uncertainty levels on each piece of equipment? Really?? Do you have any equipment you've -actually- kept calibrated? Or is it the usual story around here that goes like .."I bought this old meter cheap on eBay, it hasn't been calibrated, but I took it to a friend and measured against his uncalibrated equipment and was about the same because his cousin had a resistor once that looked pretty good on his meter, and I don't want to spend any money to cal my own equipment". And so on.
We've ordered several hundred resistors from Edwin last year, at various tolerances, .001% and .01% mostly. We maintain fully calibrated 3458a, 3456a, 732s, SR-104's etc. All equipment with drift history, etc. Guess what?? Using multiple meters backed up by the SR-104, all his resistors were fine, a couple were damaged in shipping and 1 was slightly off spec. He replaced the problem children at no cost. No drama, no BS.
In the end? We got 100% of what we ordered, in spec. That's the typical experience we have, and we've had many more problems with other vendors. We've got some Vishay Voodoo Magiacals we ordered that were supposed to be 10.1k .01% and we got 101.01 ohms instead. How's that for out of spec?? It took about 3 months before they finally replaced those.
And guess what also?? All resistors drift over time. Comes with the territory unless you buy a Reference Standard. The thing you'll notice about Pettis resistors is they tend to drift the same way, and they will have the same TC (about) if you ask him for that.
Did you ever stop to think what that means: YOU MEASURED BOTH EDWIN'S RESISTORS AND THEY WERE BOTH THE SAME....After 9+ months or whatever??? And you're complaining??!! Really!!??
C'mon.