Electrical apparatus for the calibration of equipment used in th

Details Electrical apparatus for the calibration of equipment used in th Electrical apparatus for the calibration of equipment used in th

1974-12-17

1976-07-20

Strecker, Gerard R.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Erosion

G01N 2704

Patent

active

039709280

ABSTRACT:
Calibration apparatus for use with particle volume measuring equipment us the Coulter process, which detects and analyzes the voltage pulses produced by particles passing a narrow aperture in which an electric field is maintained.
The calibration apparatus includes a calibration pulse generator with pulse-shaping circuitry which produces a sequence of calibration pulses, approximately trapezoidal in shape, which are introduced into the particle measurement path, in series with the measurement aperture traversed by the particles. The generator includes precision attenuation resistors for varying the amplitude of the calibration pulses.
The apparatus also provides for adjusting and maintaining a constant current through the measurement aperture and for amplifying the pulses produced by particles passing through the aperture whose amplitude is compared with the amplitude of the calibration pulses.

REFERENCES:
patent: 2656508 (1953-10-01), Coulter
patent: 3670150 (1972-06-01), Hogg et al.
patent: 3745455 (1973-07-01), Haigh

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