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The effect of energisation current on the calibration of silicon diode thermometers

The effect of energisation current on the calibration of silicon diode thermometers
The effect of energisation current on the calibration of silicon diode thermometers
The BC557 transistor is widely used as a silicon diode thermometer in which the collector-base voltage, at a constant bias current, is measured as the indicator of temperature The normally applied bias current for this measurement is 10?A, however under some circumstances advantage may be gained by biassing at a higher current Since its first use in thermometry the BC557 has undergone changes in its production technology and these have had some impact on its temperature characteristics. In this paper the sensitivity of calibration to bias current is discussed and data is presented on old and new technology devices which have been characterised at 10 and 50?A. At higher temperatures, a reduced spread in the V-T characteristics of the devices is observed with the higher current, giving an improved conformity to standardised calibration data.
0750305975
775-779
Institute of Physics
Gowlett, D.J.
2472088b-6c05-4157-b055-af29a0f7510c
McDonald, P.C.
0e6a4b1d-2a8d-4c9e-9254-48a6f1a7eb37
Scurlock, R.G.
1e6e927d-a650-4c64-af64-3a8546a4cd07
Watson, J.H.P.
e4f7e9d2-6299-4626-bc44-1ee8545899e6
Gowlett, D.J.
2472088b-6c05-4157-b055-af29a0f7510c
McDonald, P.C.
0e6a4b1d-2a8d-4c9e-9254-48a6f1a7eb37
Scurlock, R.G.
1e6e927d-a650-4c64-af64-3a8546a4cd07
Watson, J.H.P.
e4f7e9d2-6299-4626-bc44-1ee8545899e6

Gowlett, D.J., McDonald, P.C., Scurlock, R.G. and Watson, J.H.P. (1998) The effect of energisation current on the calibration of silicon diode thermometers. In Proceedings of the International Cryogenics Engineering Conference (ICEC17). Institute of Physics. pp. 775-779 .

Record type: Conference or Workshop Item (Paper)

Abstract

The BC557 transistor is widely used as a silicon diode thermometer in which the collector-base voltage, at a constant bias current, is measured as the indicator of temperature The normally applied bias current for this measurement is 10?A, however under some circumstances advantage may be gained by biassing at a higher current Since its first use in thermometry the BC557 has undergone changes in its production technology and these have had some impact on its temperature characteristics. In this paper the sensitivity of calibration to bias current is discussed and data is presented on old and new technology devices which have been characterised at 10 and 50?A. At higher temperatures, a reduced spread in the V-T characteristics of the devices is observed with the higher current, giving an improved conformity to standardised calibration data.

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More information

Published date: 1998
Venue - Dates: International Cryogenic Engineering Conference No.17 (ICEC17), Bournemouth, UK, 1998-07-13 - 1998-07-16

Identifiers

Local EPrints ID: 21169
URI: http://eprints.soton.ac.uk/id/eprint/21169
ISBN: 0750305975
PURE UUID: f36f94c9-5a39-4ac0-9f71-cb3fc35fdd4d

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Date deposited: 07 Nov 2006
Last modified: 22 Jul 2020 16:39

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Contributors

Author: D.J. Gowlett
Author: P.C. McDonald
Author: R.G. Scurlock
Author: J.H.P. Watson

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