I need to measure the ambient temperature with the 34420A and I was planning to use a thermistor, but I'm not sure what Beta value the thermistor should have.
The thermistor beta is typically only used to calculate temperature from the measured resistance and is not specified for the 34420A The specifications for thermistor probes for the 34420A only calls out a 5 Kohm thermistor with +/-0.1 C accuracy such as the Omega Engineering Company model 44034 thermistor bead or a probe that uses this or an equivalent thermistor element. This uses a standard universal conversion curve.built into the 34420A. Measurement Specialties and Cornerstone Sensors also supply equivalent thermistor probes. See NIST Technical Note 1265.
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