Title:
BIAS CIRCUIT FOR MEASURING INSTRUMENT
Document Type and Number:
Japanese Patent JPH04184118
Kind Code:
A
Abstract:
PURPOSE:To make a measured wave easy to see on a display by applying AD conversion to an input signal wave, and setting a bias voltage of a main amplifier and a connected part optimally, based on the data, at an information processing part. CONSTITUTION:To electrodes 1 and 2, for example, inductive voltage of an electrocardiogram is applied, and then through a preamplifier 3, input to a main amplifier 9. The amplifier 9 amplifies a biological signal voltage which is AC coupled with a coupling capacitor 4, being biased through resistors 5 to 7, by a bias power source Vb when an output of a DA converter 11 is at an open condition. An output of the main amplifier 9 is input to a computer part 12, through an AD converter 10. The DA converter 11 outputs a bias control signal of the amplifier 9 and applies a voltage to the amplifier 9 through the DA converter 11, to simplify observation of biological information after information processing from the computer part 12.
Inventors:
ANDO TAKASHI
Application Number:
JP31190390A
Publication Date:
July 01, 1992
Filing Date:
November 16, 1990
Export Citation:
Assignee:
SANYO ELECTRIC CO
International Classes:
G01D3/024; G01D3/02; (IPC1-7): G01D3/02
Attorney, Agent or Firm:
Takuji Nishino (2 outside)