Title:
ELECTRONIC THERMOMETER
Document Type and Number:
Japanese Patent JPS51134677
Kind Code:
A
Abstract:
A transistor carries a direct current that is constant at constant temp. and a signal representing the measured temp. is taken from the transistor and fed to an amplifier connected to an indicating instrument. The transistor is a field effect transistor (1) wired as a current generator. Pref. the amplifier (7) has a feedback through a coupling resistor (15) for sensitivity adjustment. Calibration dependent on ambient temp. is carried out be means of a variable neutral-point resistance (10) connected to a summation point (16) to which the coupling resistor is also brought, whereby the current in the coupling resistor is adjusted through the neutral-point resistance. The output signal of the device is linear in the range from +15 to 60 deg.C.
Inventors:
KENTO NIRUSON
Application Number:
JP4978476A
Publication Date:
November 22, 1976
Filing Date:
April 30, 1976
Export Citation:
Assignee:
SIEMENS AG
International Classes:
G01K7/01; G01K13/00; (IPC1-7): G01K7/22