公开(公告)号：US3469903A

公开(公告)日：1969-09-30

申请号：US3469903D

申请日：1967-03-22

Applicant: BECKMAN INSTRUMENTS INC

Inventor： GRICHNIK JAMES A ,  KUPFERSCHMIDT ALBERT

IPC: A61B3/02 ,  A61B5/00 ,  A61B5/16

CPC classification number: A61B5/4863 ,  A61B3/02 ,  A61B5/162

公开(公告)号：US3556083A

公开(公告)日：1971-01-19

申请号：US3556083D

申请日：1968-05-02

Applicant: BECKMAN INSTRUMENTS INC

Inventor： GRICHNIK JAMES A ,  SCHMUTZER JOEL J

IPC: A61B5/053

CPC classification number: A61B5/0531

Abstract: An operational amplifier applies either constant voltage or constant current to a subject in order to provide an output voltage directly proportional to the subject''s conductance or resistance for recording together with superimposed sharp pulses produced by a voltage-to-time interval converter, the time interval between successive pulses being proportional to the average basal electrodermal phenomena, basal resistance or basal conductance. Means for automatically suppressing the average basal electrodermal phenomena from the signal being recorded is provided.