Voltage and Temperature Measurements 2-27
Heated Zener Reference and Josephson Junction Array comparisons
The performance of a Heated Zener Reference can be analyzed by comparing it to a
Josephson Junction (JJ) Array using both channels of the Model 2182. In a cryogenic
environment, the JJ Array provides an output voltage in precise, stable 175µV steps.
The test circuit for this application is shown in Figure 2-14. The JJ Array is adjusted until
Channel 1 of the Model 2182 measures 0V ±10µV. The null condition indicates that the Heated
Zener Reference voltage is the same as the JJ Array voltage. Channel 2 of the Model 2182 is
used to determine the exact step that the JJ Array is on. Channel 1 can then be monitored to study
noise and drift characteristics of the Heated Zener Reference.
Figure 2-14
Heated Zener characterization
Zener
Heater
HI LO
2182
CH 1
V
V
2182
CH 2
HI
LO
XX
Josephson
Junction
Array
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