Variable color digital multimeter

• US 5,122,733 A
• Filed: 12/14/1990
• Issued: 06/16/1992
• Est. Priority Date: 01/15/1986
• Status: Expired due to Fees

• Current Assignee: Karel Havel
• Original Assignee: Karel Havel
• Inventors: Havel, Karel
• Primary Examiner(s): Karlsen, Ernest F.
• Application Number:
  US07/628,328
• Time in Patent Office: 550 Days
• Field of Search: 324/114, 324/115, 324/96, 324/122, 324/133, 340/701, 340/703
• US Class Current: 324/115
• CPC Class Codes: G01R 13/02 for displaying measured electric variables in digital form
• CPC Class Codes: G01R 13/26 Circuits for controlling the intensity of the electron beam or the colour of the display
• CPC Class Codes: G01R 13/405 using a plurality of active, i.e. light emitting, e.g. electro-luminescent elements, i.e. bar graphs
• CPC Class Codes: G01R 15/125 for digital multimeters
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0275 Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 3/14 Semiconductor devices, e.g. diodes

Abstract

A multimeter with variable color digital display indicates measured values in a digital format and in a variable color. The multimeter includes a color control circuit for controlling the color of the digital display in accordance with the measurement quantity, method, unit, mode, function, range, location, modifier, control, limits, and the like. A color converter circuit is disclosed for converting analog voltage to variable color.

Claims

1. An apparatus for simultaneously displaying measured values of a first quantity and of a second quantity, the apparatus comprising:

means for measuring a first quantity;

means for displaying in a selective color a digital indication of the measured value of the first quantity;

means for measuring a second quantity;

means for controlling color of said digital indication in accordance with the measured value of the second quantity.

2. An apparatus as defined in claim 1 wherein:

said means for displaying include an input for controlling color of said indication;

said means for controlling include an output for developing an output signal in accordance with the measured value of the second quantity;

said output being operatively coupled to said input for controlling color of said digital indication in accordance with said output signal.

3. An apparatus as defined in claim 1 wherein:

said means for controlling include a comparator for comparing the measured value of the second quantity with a predetermined limit and for developing an output signal accordingly;

said output signal being operative to control color of said means for displaying.

4. A method of simultaneously displaying measured values of a first quantity and of a second quantity, the method comprising:

measuring the first quantity;

displaying in a selective color a digital indication of the measured value of the first quantity;

measuring the second quantity;

controlling color of said digital indication in accordance with the measured value of the second quantity.