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> Precision voltage reference 5V .01% standard calibrator
Precision voltage reference 5V .01% standard calibrator
The circuit board was designed to minimize the effects of mechanical stress on the reference IC. Specifically, the REF5050 was placed on the edge of the board and 2 adjacent slots decouple stresses in the board from reaching the reference which could otherwise cause the output voltage to shift.
The REF5050 is carefully and quickly soldered to the board and every one of the references that we have sold easily exceed the specifications listed above.
The worst-case change with temperature is a low 13ppm / oC (.0013% / oC) or only +- 65uV / oC.
After the unit is assembled, it is powered up with a 9V power supply for a minimum of 200 hours to "age" the reference and improve its long term stability. After aging, the trim potentiometer is carefully adjusted for a reference output of 5.00000V as measured by our calibrated 8.5 digit HP 3458A DMM that has an accuracy of 0.0008%. (Davis Calibration, Certificate of Calibration # 3846118 valid through January 27, 2011). Accidental movement of the trimpot adjustment is prevented by the application of a small amount of clear nail polish. The ambient temperature is also recorded (typically 21oC).
