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DC specifications
Typical calibration accuracy (direct comparison to a second Josephson Voltage Standard)

± 4 nV @ 10 V
ΔV/V10 V = 4×10-10

Typical calibration accuracy of secondary voltage standards (limited by the noise of the secondary voltage standard)

± 20 nV @ 1V
ΔV/V1 V = 2×10-8

± 100 nV @ 10 V
ΔV/V10 V = 1×10-8

Thermal voltage of wires and reversal switch

< 10 nV @ all 3 channels

Typical gain factor g of external voltmeter (depends on the type of voltmeter)

Δg/g < 3×10-7  
 
Voltage_03.jpg
Direct comparison of supraVOLTcontrol with the Josephson Voltage Standard of the Physikalisch-Technische Bundesanstalt (PTB) @ 10 V.
 
 
The measured voltage difference corresponds to an accuracy of 7×10-11 with a measurement uncertainty of 3.4×10-10.  
 
 

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