257 Каталог MAHR 2014 Измерительные инструменты и приборы для линейно-угловых измерений Стр.7-37

Каталог MAHR 2014 Измерительные инструменты и приборы Стр. 7-37 0257 ENG Lab2u

Millimar Electrical Length Measuring Instruments M 7-37 Mahr Electronic Levels Offer fast response fine resolution and excellent repeatability Features Used to determine any deviation in the right angle relationship between a horizontal surface and the earth's gravitational force (usually expressed as an angular or linear deviation from absolute level). Show any change in this relationship over time. Compare the orientation attitude of separate or adjacent horizontal surfaces. Show any change in this comparison over time. Level systems are angular-linear compatible. Sensing heads are interchangeable with Mahr Federal's gage heads to accommodate linear measurements. Fast Response quick response to slight angular changes permit taking fast and accurate measurements at various sensing head positions or taking dynamic position readings. Resolution Repeatability Mahr Federal's Electronic Levels far exceed the sensitivity and accuracy of precision spirit levels with a resolution to 6 in per foot (.1 arc second) compared to the spirit level's resolution of .0001" per foot. With repeatability at .1 arc second Electronic Levels are ideal for ultra-high resolution profiling. Direct Dimensional Readout multiplier feature permits operator to view displacement caused by the angular measurement of the level head; this is displayed as an inches per foot readout rather than arc seconds eliminates readout confusion when switching from spirit levels to electronic levels. Angular-Linear Compatible sensing heads are easily interchangeable with Federal gage heads to accommodate linear measurements. Operator Friendly Level systems are often compared to the autocollimator or laser calibration systems. In each case the measurement technique is basically the same. Electronic Levels however are much easier to set up and operate. Results are obtained cost-effectively without requiring time consuming sight path alignments. There are no optical surfaces to keep clean and the Level does not need a turbulence-free environment to achieve accurate readings. How they work As shown in the figure our Sensing Head operates on the pendulum principle with a pendulum supported by two reed springs attached to an extension block at the top of the Sensing Head housing. Tilting the head causes a change in the position of the pendulum's shading loop in relation to the center leg of the core. This produces an electrical imbalance in the amount of flux passing through the two secondary coils delivering a signal proportional to the displacement of the pendulum. This is displayed on a Mahr Federal amplifier meter which is graduated in seconds of arc. + F