[volt-nuts] Experiment: tilting LTZ reference

[Dr. Frank Stellmach]

  For Andreas - never did such a crazy experiment before.

I rotated my double LTZ reference on every of the six sides and measured 
the deviation relative to the 3458A.
At least 2min between measurements for stabilization (sufficient).
Obviously, no appreciable drift occured in the 3458A in between the 
whole run.

I have seen a drift of max. 1ppm during rotation.
Thermal root cause, not magnetic, because drift to consecutive stable 
value is slow, not instantaneous.

Here's the table:

                   Uref1        Uref2        rel. to cal    rel. to 0°
01.01.2010        7,1762318    7,1479788
0°                7,1762295    7,1479862   -0,3    1,0    0,0    0,0
90°               7,1762330    7,1479892    0,2    1,5    0,5    0,4
180°              7,1762375    7,1479893    0,8    1,5    1,1    0,4
270°              7,1762329    7,1479848    0,2    0,8    0,5   -0,2
Back Side         7,1762370    7,1479932    0,7    2,0    1,0    1,0
Front Side        7,1762372    7,1479918    0,8    1,8    1,1    0,8
360°              7,1762292    7,1479848   -0,4    0,8    0,0   -0,2
acal dcv          7,1762295    7,1479845   -0,3    0,8    0,0   -0,2


regards Frank.