Nicholas Edgington

Gary M Ackerman

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.

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Worcester, MA, United States of America

Nicholas Edgington