Digital indicator

Details Digital indicator Digital indicator

1978-09-21

1980-05-06

Little, Willis

Geometrical instruments

Area integrators

Electrical

33DIG13, 73105, G01B 734

Patent

active

042009863

ABSTRACT:
The digital indicator measures surface deviations from a reference measurement point and employs a probe or plunger positionable against a part that is being measured such as a machine part. The device basically comprises, in addition to the probe or plunger, strain gage means, an amplifier for receiving signals from the strain gage means, a digital volt meter, a digital display, and a momentary setting swtich. A preliminary signal from the strain gages at an initial pressure level is coupled via the amplifier to a differential input of the digital volt meter. The momentary switch nulls the meter to zero for the initial reading with deviations of either polarity being subsequently registered and displayed on the digital display.

REFERENCES:
patent: 3924458 (1975-12-01), Woodworth et al.
patent: 4106333 (1978-08-01), Salje' et al.

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