Method for calibrating components permitting the use of low cost

Details Method for calibrating components permitting the use of low cost Method for calibrating components permitting the use of low cost

1993-03-08

1994-09-27

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Calibration

324600, 324691, 324713, 73 1R, G01R 2700

Patent

active

053510097

ABSTRACT:
Low cost components of a circuit board are calibrated in a test fixture to the same accuracy as a single high precision resistor, thereby eliminating the need for high precision, high cost components. The current through the resistor on the circuit board under test is ascertained by determining the current through the resistor by measuring the voltage of the high precision resistor. The voltage across the resistor under test is measured by a controller on the circuit board, thereby being able to calculate a high accuracy value for the resistor. The digital to analog converter (DAC) on the circuit board is calibrated by placing digital load values, or inputs, to the DAC and measuring the voltage across the corresponding calibrated resistors. Two values of inputs are used which define a line thereby calibrating the DAC.

REFERENCES:
patent: 4081744 (1978-03-01), Ray
patent: 4335349 (1982-06-01), Baldock et al.
patent: 4608657 (1986-08-01), Manome et al.
patent: 4663586 (1987-05-01), Swerlein et al.
patent: 4734873 (1988-03-01), Malloy et al.
patent: 4795963 (1989-01-01), Ueno et al.
patent: 4841229 (1989-06-01), Eccleston

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