Method and record for calibration of a spectrophotometer

• US 4,744,657 A
• Filed: 07/11/1985
• Issued: 05/17/1988
• Est. Priority Date: 07/11/1985
• Status: Expired due to Fees

• Current Assignee: Beckman Instruments, Inc. (Danaher Corporation)
• Original Assignee: Beckman Instruments, Inc. (Danaher Corporation)
• Inventors: Master, Barry S., Aralis, Frank M.
• Primary Examiner(s): Evans, F. L.
• Application Number:
  US06/754,369
• Time in Patent Office: 1,041 Days
• Field of Search: 356/319, 356/323, 356/325, 356/326, 356/328, 356/300, 364/498, 364/526, 364/571
• US Class Current: 356/319
• CPC Class Codes: G01J 2003/2866 Markers; Calibrating of scan
• CPC Class Codes: G01N 21/274 Calibration, base line adjustment, drift correction
• CPC Class Codes: G01N 2201/12723 Self check capacity; automatic, periodic step of checking
• CPC Class Codes: G01N 2201/12738 Selectively initiating check
• CPC Class Codes: G01N 2201/12753 and storage

Abstract

A record of calibration data containing determined values required for accurate operation of a scientific instrument measuring transmissions or absorbance of light in analysis is provided. A method of maintaining and using the records generated by the instrument permits use of the instrument to determine which records are required for efficient and easy instrument usage.

Claims

1. A method for obtaining calibration of a scientific instrument performing analysis through measurement of light transmission or absorbance at certain wavelengths of generated monochromatic light, said instrument being controlled by a computer or microprocessor having memory means for storing and accessing information, and electronic signal processing means including amplifiers responsive to calibration signals for generating an output responsive to said light measurement, comprising:

generating a plurality of records of calibration signal values by said computer for entry into said next computer memory, said computer memory storing the most recent record and retaining the next most recent n records used by said scientific instrument, and erasing all records ealier than n records upon introduction of a new record into computer memory for each wavelength of light measured, each record comprising a plurality of signals for reception by said electronic signal processing means which provide information of the following parameters;

(a) wavelength of light;

(b) amplifier offset value for a specified light wavelength;

(c) amplifier gain value for a specified light wavelength;

(d) a first processing means output for a first light transmission characteristic;

(e) a second processing means output for a second light transmission characteristic.

2. The method for obtaining calibration of claim 1 wherein generation of said record of calibration signals include signals which provide information of the following parameters:

(f) processing means output of a first light transmission characteristic indicating absorbance;

(g) processing means output of a second light transmission characteristic indicating absorbance.

3. The method for obtaining calibration of the scientific instrument of claim 1 wherein said generation of a record of calibration signals further includes a signal providing a parameter for reference of the processing means output when no light is absorbed prior to measurement.