Hello Illya,
I'm not d'accord with your calibration procedure.
At first, there is no estimate of your basic 10Vdc and 10kOhm uncertainty in your lab, for evaluation of the overall 3458A uncertainty.
Then, in your performance test list, you did not add the 3458A uncertainties for the different ranges and modes, neither relative to your basic 10V/10k uncertainty, nor absolute uncertainties.
Therefore, all the deviation numbers of your K2000 are flapping in the breeze.
Additionally, as the KEI2000 has been adjusted just before this verification, its 24h limits should be taken as test limits, not the 1yr. limits.
That would detect any further systematic calibration errors.
Then, 10mVdc and 10 Ohm are at least already outside specification after your calibration / adjustment.
Obviously, there seem to be systematic errors in your setup.
You might do a better offset voltage nulling, to get better agreement.
Maybe you should better use a precise 10:1 / 100:1 Hamon divider to calibrate 10mV and 100mV ranges.
If the KEI2000 does not support offset compensation, it is necessary to do a better estimation of possible errors for 10 Ohm.
Same goes for the 3458A, usage of OCOMP is mandatory.
100mAac probably is also outside specification, as the 3458A already has 800ppm uncertainty for 60Hz.
1000Vdc is also very questionable, as the 3458A itself is not very accurate here, at least +/- 15ppm systematic error, according to specification.
For 10VAC, I assume you used ACV SYNC?
I saw the "MORE INFO" annunciator briefly, but I'm not sure, how you really made this measurement... generally, you should document all 3458A modes in a detailed manner.
Anyhow, for ACV SYNC, you should better use 7 1/2 digit resolution to get more stable and more precise reading on the 3458A, or at best should use Swerleins algorithm.
Then you may have used silicone or similar cables for Ohm calibration, and twisted plus and minus together.. so you will get big errors for 10k, 100k, 1M, and 10M, due to leakage currents.
I don't know, if the shielded 4 pole cable, you used during verification, is insulated with PTFE, or better material. That would improve measurement precision.
It's also not visible, whether you used appropriate delays on both instruments for 10k and 100kOhm ranges, when using OCOMP feature on the 3458A.
In summary, your calibration process and uncertainty estimations need to be improved.
Frank