SQUID readout circuit
with bias reversal, and
control box with built-in rechargable battery.
|Our dc SQUID readout circuits SQE-DC-100k and SQE-DC-400k are also
available with bias-reversal modulation. Bias reversal will suppress
low-frequency excess noise produced by critical current fluctuations, and
is especially helpful when reading out high-temperature superconductor
SQUIDs. 1/f noise produced by critical current fluctuations can also
be a problem in LTS SQUIDs when magnetic fields at very low frequencies
(mHz) have to be measured.