Null monitoring system

Details Null monitoring system Null monitoring system

1975-03-17

1976-08-03

Smith, Jerry

Registers

Transfer mechanism

Traveling pawl

177DIG6, G06F 1520, G01G 2310

Patent

active

039731090

ABSTRACT:
The disclosure relates to a null monitoring system for a digital incremental scale of the type including a weighing platform and a reticle assembly which provides first and second sinusoidal outputs 90.degree. out of phase for deriving counting pulses indicative of the weight of the load and the weighing platform position accurate to a single digital increment of the scale and the direction of movement of the weighing platform. The null monitoring system provides an analog indication of the actual position of the weighing platform within the digital increments for zero reference and calibration purposes.
The null monitoring system includes combining means for combining the first and second sinusoidal outputs for providing first, second, third and fourth combined sinusoidal outputs, each having a 90.degree. quadrant with an instantaneous magnitude indicative of the position of the weighing platform within the digital increments, monitoring means for monitoring the magnitudes of the combined sinusoidal outputs, and counting means responsive to the counting pulses for selecting individual ones of the combined sinusoidal outputs during 90.degree. quadrants thereof to be monitored by the monitoring means.

REFERENCES:
patent: 3371335 (1968-02-01), Seewald
patent: 3403392 (1968-09-01), Wogatzke
patent: 3713139 (1973-01-01), Sanford et al.
patent: 3740536 (1973-06-01), Takahashi et al.
patent: 3805907 (1974-04-01), Knothe et al.
patent: 3826318 (1974-07-01), Baumgartner

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