Abstract
Tests of interface electronics for thermal response and electromagnetic interference (EMI) susceptibility were conducted on two unmodified commercial SQUID systems to determine their suitability for use on NASA space missions. The zero offset and open loop gain were measured as a function of preamplifier temperature for one RF and one DC SQUID system while the electronics were in vacuum. Suitable performance can be obtained from these systems operating from 0 to 40°C if the preamplifier temperature is controlled. Measurements of EMI susceptibility were performed on one RF and several DC SQUID systems by exposing the preamplifiers to fields up to 2 V/m at frequencies from 10 KHz to 250 MHz. The RF SQUID system was sensitive at narrow bands near the 200 Mhz modulation frequency. The DC SQUID systems were very sensitive to EMI in broad bands over the frequency range studied, at field intensities as low as 0.5 V/m. These preliminary tests show that the DC SQUID systems tested will need extensive modifications in order to reduce their EMI susceptibility to acceptable levels.
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