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si5datalogger: Measure cryostat heat exchanger Pt100 on cannel 109
Replaces the functionality formely implemented by cryo124k via the Agilent 34970A datalogger. The valid range for Pt100 temperature measurements defined in ITS-90 and IEC-751 is 73 K to 1123 K. However, the Agilent 34970A produces bogus readings below about 80 K. To avoid this issue the Pt100 sensors are configured for 4-wire resistance measurement and the calibration is done in software.
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