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Title:
DISCONNECTION DETECTOR OF ELECTRIC CIRCUIT EQUIPPED WITH BRIDGE OSCILLATOR
Document Type and Number:
Japanese Patent JPS60127472
Kind Code:
A
Abstract:

PURPOSE: To make it possible to easily detect the disconnection in an electric circuit, by connecting a detection condenser to the terminal of the electric circuit and detecting the presence of absence of disconnection on the detection signal thereof.

CONSTITUTION: When the filament 2 of a measuring element is disconnected, a bridge circuit 1 comes to a non-equilibrium state and DC voltage appears in a connection terminal C and is applied to a detection condenser 11. By this mechanism, a transistor 13a is turned OFF while collector voltage +V is applied to one input of a comparator 14 to be compared with reference voltage Ve of the other input and LED15 is turned OFF in a state of +V>Ve.


Inventors:
OGAWA YOSHINOBU
NISHIJIMA TADASHI
Application Number:
JP23509283A
Publication Date:
July 08, 1985
Filing Date:
December 15, 1983
Export Citation:
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Assignee:
ULVAC CORP
International Classes:
G01R31/02; G01L21/10; H03B1/00; H03B5/26; (IPC1-7): G01R31/02; H03B1/00; H03B5/26
Domestic Patent References:
JPS55108977U1980-07-30
Attorney, Agent or Firm:
Shigeru Yagita