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!
![Azn ^-^](https://www.eevblog.com/forum/Smileys/default/azn.gif)
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...
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
Maybe it is the deal of the century for volt-nuts.