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Thermoelectric power measurements using analog subtraction
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8.Product of Analog Devices, Inc., Norwood, MA 02062.
9.The substitution of more expensive, lower bias current, instrumentation amplifiers will allow samples with impedances up to to be measured. For example, the high‐impedance () FET 3621K instrumentation amplifier (Burr‐Brown, Inc., International Airport Industrial Park, P.O. Box 11400; Tucson, AZ 85372) can be substituted for the AD521J. The upper bound on the sample impedance, is determined by the input bias currents of and (Fig. 1). Referred to the output of (or ), a voltage is induced by these bias currents. This voltage can saturate or
10.These resistors should be metal film type to avoid temperature‐induced drift in the amplifier gain.
11.To match the bandwidths we simultaneously placed the same ∼0.5 Hz differential signals to the inputs of and and applied their respective outputs to an X–Y plotter. The bandwidths were considered matched when the resulting Lissajous figures on the plotter closed to a straight line.
12.We used DuPont No. 4922 silver paint.
13.A. Mabatah, E. Yoffa, P. C. Eklund, M. S. Dresselhaus, and D. Adler (unpublished).
14.R. L. Kautz, M. S. Drusselhaus, D. Adler, and A. Linz, Proceedings of the 11th International Conference on the Physics of Semiconductors (Polish Scientific Publishers, Warsaw, 1972), pp. 807–812.
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