It is a very impressive DC standard and the price you paid is unbelievable.
How much did you pay for your 8 1/2 digit Advantest multimeter, if I may ask.
Advantest makes some real nice gear.
Thanks!
They really do make great gear, especially for hobbyists because you can get some fantastic deals as they don't carry the name of Tektronix or HP/Agilent.
The R6581 cost a measly JPY50k or about USD420, no joke.
So basically the R6581 was Advantest's answer to the HP3458A, it also has 2 source artifact calibration and auto calibration. More importantly, the R6581 actually stores the auto cal constants in
battery backed up memory, and I bet you can guess why it was sold for so cheap after 17 years of use. The meter was autoranging like a madman and it refused to show a reading because it lost its auto cal constants.
$10 later for a replacement battery and I'm still smiling...
Maybe it is the deal of the century for volt-nuts.