研究目的
To quantify the uncertainty associated with removing power to Fluke zener reference standards for extended periods of time and to potentially expand the Retrace specification on the new Zener reference standard.
研究成果
Data indicates a high degree of confidence that Fluke Zener reference standards can have power removed for up to 14 days and still recover to a value well under 0.25 μV/V. This condition is valid when external temperatures range between 23 and 45 oC. More work is needed for temperatures less than room temperature.
研究不足
The experiments were conducted under controlled laboratory conditions (23 C +/- 0.5 oC, 45% RH +/- 5% RH). More work is needed to observe hysteresis when external temperatures are less than room temperature.
1：Experimental Design and Method Selection:
Experiments were conducted on a group of four newly manufactured 732B's to understand the effects of losing power. 3 units had power removed for up to 14 days, and one unit was left always on as a control. Power was re-applied and calibration data for the 10 volt output was taken approximately three times per day for two weeks.
2：Sample Selection and Data Sources:
A group of four newly manufactured 732B's were selected as they are representative of instruments built without variation since
3：List of Experimental Equipment and Materials:
20 Fluke 8508A as a detector, a DataProof 320A scanner, and VoltRef software were used. The devices were compared to four 732A's calibrated by the Fluke Josephson Voltage system.
4：Experimental Procedures and Operational Workflow:
The 732B's were maintained in a laboratory environment of 23 C +/- 0.5 oC with humidity controlled to 45% RH, +/- 5% RH. Power was removed and the batteries were allowed to extinguish for up to 14 days, then power was re-applied and calibration data was collected.
5：5 oC with humidity controlled to 45% RH, +/- 5% RH. Power was removed and the batteries were allowed to extinguish for up to 14 days, then power was re-applied and calibration data was collected.
Data Analysis Methods:
5. Data Analysis Methods: The calibration data was analyzed using linear regression prediction with 2-sigma confidence limits.
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