Equipment Measured with -
-AMProbe AM-520
-Fluke 8012A Digital Multimeter
-HP 3478A Multimeter


All meters have unknown Calibration information.

PX Reference was measured on the 3478A Over 12 hours, and just spot checked on the Fluke and AMProbe.

FX Reference was Measured twice on the 3478A one 24H period with Auto Zero turned off. And a short one over 2 hours with Auto Zero turned on.

The resistor references where each checked again on the AMProbe and Fluke 8012 just as a short check to make sure they are within spec. But were watched on the 3478A for about an hour to see if there was any change. It was pretty stable.