The inductive voltage dividers (IVDs) used in the thermostat of NASA's Zeno experiment were tested using an automatic IVD bridge developed at the National Institute of Standards and Technology (NIST). To achieve ±10 μK temperature control, the thermostat must be able to measure resistance ratios with a differential linearity of ±0.1 parts-per-million (ppm). The test results show that within a ratio range of 0.5 to 0.6 at frequencies between 200 Hz and 400 Hz, the thermostat IVDs were linear to ±0.07 ppm.
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