Quick Guide to Precision Measuring Instruments

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PG35Quick Guide to MeasurementPivoted stylus typeMLH-521 (measuring direction can be switched with the up/down lever)MLH-522 (measuring direction is not switchable)Parallel translation typeMLH-326 (measuring direction can be switched with the upper dial)First contact.Plunger moves until the indicator reads zero.0測定子がフリーの状態0測定子をメータが0になるまで押込んだ状態ゼロProbeRelay outputComparative measurementLinearity0 (zero) pointMeasurement rangeMeasurement rangeLever probesPre-travelMeasuring forceDigimatic codeOpen collector outputA sensor that converts movement of a contact point, on a stylus or plunger, into an electrical signal.Contact signal that outputs the open/closed status.A measurement method where a workpiece dimension is found by measuring the difference in size between the workpiece and a master gage that represents the nominal dimension of the workpiece. This method is usually applied when the measurement to be made is greater than the measuring range of the instrument. The ratio of proportionality between probe output and measured distance. If this is not constant within acceptable limits then correction is required.A reference point on the master gage in a comparative measurement.The measurement range chosen determines the resolution available. A small range increases the resolution, and visa versa. Analog Mu-checkers provide multiple ranges because of the limited length of the scale, whereas digital versions only need to provide two.Tolerance limits can be set on the electronic micrometer to provide an automatic judgment as to whether a measured value falls within the tolerance.Lever probes are available in two types. The most common type uses a pivoted stylus so the contact point moves in a circular arc; this type is subject to cosine effect and, therefore, measurements may require linearity correction if the direction of measurement is much different to the direction of movement of the contact point. The less common type uses a parallel translation leaf-spring mechanism so contact point movement is linear; this type requires no correction.The distance from first contact with a workpiece until the measurement indicator reads zero.The force applied to the workpiece by the probe when the indicator registers zero. It is indicated in newtons (N).A data format specic to Mitutoyo measuring instruments.A direct connection to the collector of a driving transistor.Electronic Micrometer