Modular electronic instrument system having automated calibration capability

• US 4,947,355 A
• Filed: 05/05/1988
• Issued: 08/07/1990
• Est. Priority Date: 05/05/1988
• Status: Expired due to Fees

• Current Assignee: John Fluke Mfg. Co., Inc.
• Original Assignee: John Fluke Mfg. Co., Inc.
• Inventors: Koeman, Henriecus
• Primary Examiner(s): Teska, Kevin J.
• Application Number:
  US07/190,582
• Time in Patent Office: 824 Days
• Field of Search: 364/480, 364/481, 364/483, 364/513, 364/550, 364/551.01, 364/571.01, 364/571.04, 364/571.07, 364/571.08, 364/579, 364/580, 364/19.1, 364/200, 364/900, 371/20, 324/73 AT
• US Class Current: 702/91
• CPC Class Codes: G01R 35/005 Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references G01R33/0035, G01R35/002 take precedence

Abstract

A modular electronic instrument system having automated calibration capability comprises a system controller and a plurality of calibration instruments for calibrating a target instrument. The instruments, if remotely controllable, may be interconnected by a common interface bus. The calibration instruments have associated therewith a characteristics file including resource capability information, and an instrument to be calibrated has associated therewith a characteristics file including calibration information. The system controller automatically derives calibration requirements from the calibration information and matches the requirements with resource capabilities of the calibration instruments. All of the characteristics files may be provided in a standardized format so that a system may be configured without regard to instrument-specific model numbers or manufacturers.

Claims

1. A modular electronic instrument calibration system, comprising:

an instrument to be calibrated having associated therewith a characteristics file including calibration information;

one or more calibration instruments connectable to said instrument to be calibrated, each of said calibration instruments having associated therewith a characteristics file including resource capability information; and

control means for automatically deriving requirements for calibration from said calibration information, and matching said requirements with said resource capability information.

2. A modular electronic instrument calibration system in accordance with claim 1 wherein said calibration information comprises calibration instructions in standardized format.

3. A modular electronic instrument calibration system in accordance with claim 1 wherein said control means automatically configures calibration instruments with an instrument to be calibrated, independent of specific model members of said calibration instruments.

4. A modular electronic instrument calibration system in accordance with claim 1 wherein said control means further creates calibration steps from said requirements and said resource capability information.

5. A modular electronic instrument calibration system in accordance with claim 4 wherein said calibration steps are performed automatically under remote control by said control means.

6. A modular electronic instrument calibration system in accordance with claim 4 wherein said calibration steps are displayed by said control means in the form of instruction messages.

7. A modular electronic instrument calibration system in accordance with claim 1 further comprising an interface bus, wherein said control means and at least one of said calibration instruments are coupled to said bus.

8. A modular electronic instrument calibration system in accordance with claim 7 wherein said instrument to be calibrated is also coupled to said bus, and the characteristics files of said instrument to be calibrated and said calibration instruments include remote control information.

9. An automated calibration system for calibrating a target instrument, said calibration system comprising:

one or more calibration instruments connectable to said target instrument;

means for providing calibration requirements of said target instrument in standardized format;

means for providing resource capabilities of said calibration instruments in standardized format; and

means for matching said requirements with said resource capabilities and generating therefrom calibration steps.

10. An automated calibration system in accordance with claim 9 wherein said means for matching said requirements with said resource capabilities comprises an instrument controller including a processor.

11. An automated calibration system in accordance with claim 10 wherein said means for providing calibration requirements of said target instrument is target instrument software, and said means for providing resource capabilities of said calibration instruments is calibration instrument software.

12. An automated calibration system in accordance with claim 11 wherein both said target instrument software and said calibration instrument software include remote control information, and said instrument controller automatically connects said calibration instruments to said target instrument under program control and instructs said calibration instruments to provide stimulus signals to said target instrument.

13. An automated calibration system in accordance with claim 12 wherein said instrument controller further provides calibration instruction messages to a display device.

14. An automated calibration system in accordance with claim 12 wherein said instrument controller provides calibration instructions directly to said target instrument.

15. In an automated test system having at least one instrument and a computer controller therefor, the computer controller accessing a characteristics file describing functions and properties of the instrument for generating test instructions therefor, the improvement comprising:

a calibration file describing calibration information for the instrument;

at least one calibration instrument connected to said computer controller,

a calibration instrument file describing characteristics of each calibration instrument,

said computer controller accessing said calibration file to determine a calibration procedure for the instrument and accessing said calibration instrument file to identify at least one calibration instrument for use in said calibration procedure.

16. An improved test system as recited in claim 15, wherein said computer controller further operates to generate a sequence of steps for said calibration procedure corresponding to said at least one calibration instrument used in said calibration procedure.

17. An improved test system as recited in claim 15, wherein said computer controller further operates to generate a sequence of displays for instructing technical personnel to carry out for said calibration procedure a sequence of steps corresponding to said at least one calibration instrument used in said calibration procedure.

18. An improved test system as recited in claim 15, wherein said instrument is remote controllable and further comprising an IEEE information file describing remote control protocol for said instrument, said computer controller accessing said IEEE information file for providing control signals for said instrument.

19. An improved test system as recited in claim 15, wherein said calibration instrument is remote controllable and further comprising an IEEE information file describing remote control protocol for said calibration instrument, said computer controller accessing said IEEE information file for providing control signals for said calibration instrument.

20. An improved test system as recited in claim 15, wherein said instrument includes internal storage for said calibration file, said computer controller connected to said instrument for accessing information from said calibration file to establish said calibration procedure for said instrument.

21. An improved test system as recited in claim 15, wherein said calibration instrument includes internal storage for said calibration instrument file, said computer controller connected to said calibration instrument for accessing information from said calibration instrument file to identify said calibration instrument for use in said calibration procedure for said instrument.

22. An improved test system as recited in claim 21, wherein said computer controller further identifies said at least one calibration instrument for use in said calibration procedure by determining capabilities required of said calibration instrument from said calibration file describing calibration information for the instrument and by searching through the calibration instrument file for each calibration instrument available for carrying out the calibration procedure.