公开(公告)号：US3597760A

公开(公告)日：1971-08-03

申请号：US3597760D

申请日：1968-10-31

Applicant: BAXTER LABORATORIES INC

Inventor： FOX HAROLD L ,  SEITZ LAMONT J ,  THORNE GALE H

IPC: G01J3/42 ,  G01N21/00 ,  G01N21/27 ,  G06J1/00 ,  G06G7/18

CPC classification number: G06J1/00 ,  G01N21/27

Abstract: An electronic apparatus and system is described for use in conjunction with a spectrophotometer, and the like, and which is capable, for example, of directly reading the difference between two optical transmission readings of two successive test samples; or of converting the difference into a logarithmic scale, indicating the difference in optical densities of the two samples.