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1) The calibration date on the 34465A is 30th of June, so over 90 days ago
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Cheers
Alex
The DCV drift is dependent on the instruments uptime. If it's not used so often, it may as well have its initial uncertainty.
Mine is from about June 2015, I think, and it's still within about 1ppm.
HighVoltage's 34470A, which is running 24/365, showed a drift of +5ppm only, after about 10 months.
This is also typical for the LTZ1000A reference, at 95°C.
The Ohm ranges, as their components are running on RT, won't drift as much, and the 34470A was also found to be within 1ppm for 10kOhm.
So your observation is an indicator, that your instrument is still in very good condition; 3 months of operation is nothing.
Ah yes, you should try to get the 2MB option for free.. I also got it this year, despite mine was an elder one.
Frank