RESISTOR SELECTING DEVICE Russian patent published in 1996 - IPC

FIELD: manufacture of precision film resistors. SUBSTANCE: device has reference-voltage supply 1, comparison unit 2, ohmmeter 3, analog-to-digital converter 4, first shift register 5, multivibrator 6, first group of AND gates 7-1 through 7-n, exclusive OR unit 8, second shift register 9, vibrator 10, working electrode 11, resistor 12 being selected mounted on substrate holder 13, second group of AND gates 14-1 through 14-n, low-frequency oscillator 15, flare-discharge generators 16-1 through 16-n. During selection, device affords sequential increment of resistance while eliminating noise. EFFECT: improved noise immunity and reproducibility of resistor parameters; eliminated readjustment. 2 dwg