Active trim method and apparatus

Details Active trim method and apparatus Active trim method and apparatus

1994-01-18

1995-06-27

Evans, Geoffrey S.

Electric heating

Metal heating

By arc

29593, B23K 2600

Patent

active

054282047

ABSTRACT:
An electronic probe circuit having ac and dc amplifiers and an input compensation subcircuit is enclosed within a trim housing that replicates the electrical effect of the probe housing. The circuit is laser trimmed through ports in the trim housing. The difference between the voltage at 80 nsec and 1.4 .mu.sec points on a step voltage provides a first calibration factor while the difference between the 3 nsec voltage and the 80 nsec voltage provides a second calibration factor. A resistor in the DC amplifier is trimmed to an absolute voltage with a step scan laser cut. A resistor in the AC amplifier is trimmed with a laser L-cut until the difference between the 80 nsec and 1.4 .mu.sec points of the step voltage equals the first calibration factor. A capacitor in the input compensation subcircuit is trimmed until the voltage difference between the 3 nsec and 80 nsec points equals the second calibration factor.

REFERENCES:
patent: 3827142 (1974-08-01), Bennett et al.
patent: 4021898 (1977-05-01), Willis et al.
patent: 4149064 (1979-04-01), Houska et al.
patent: 4403133 (1983-09-01), Turner et al.
patent: 4564736 (1986-01-01), Jones
patent: 4907341 (1990-03-01), Chapel, Jr. et al.

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