Check that the plates are reasonably close to being parallel to each other. Zero the outside micrometer at the start and adjust as required by the manufacturers specifications. To achieve the highest precision with the topofthe line b20 model, the optional parallel plate micrometer. This ppp micrometer attaches to the telescope of the zeiss ni2 automatic level. This makes the na2 the ideal precise level for deformation studies or industrial measuring tasks. Optical precise level precise type with parallel plate micrometer manufacturer quote. By turning the micrometer knob the parallelsided glass plate is tilted, thereby causing the line of sight to be raised or l. Ts0071 outside micrometer calibration record sheet must be used. The top plate is xed to an insulating frame, while the bottom plate is attached to a mobile optical stage. Parallels are adjustable and nonadjustable high grade steel blocks with precision ground parallel edges.
This work proposed a novel method of investigating the charging characteristics of micrometer sized aqueous droplets based on parallel. In a parallel plate rheometer for a fluid, such as oils or polymers, the material is confined between the two shearing plates by capillary forces and does not. The mems parallel plate rheometer uses a 1 mm square nano positioner stage to apply a controlled sinusoidal strain, with displacement up to 15 micrometers. Digital micrometer model 4956 measuring thickness the model 4956 digital micrometer combines unmatched accuracy and resolution, a modern contemporary look. The parallel plate micrometer permits direct readings to 0. The device is suitable therefore for strain or stresscontrolled operation. The accuracy of this device is discussed by wells, et al. This ratio cof charge to potential c q v 1 is constant and is known as the capacitance of the capacitor. Determining dielectric constants using a parallel plate. Optional parallelplate micrometer for precise fine levelling. Optical survey equipment leica na2 precise automatic level. The charging characteristics of micrometer sized aqueous droplets have attracted more and more attentions due to the development of the microfluidics technology since the electrophoretic motion of a charged droplet can be used as the droplet actuation method. This micrometer allows easy, rapid and highaccuracy measurement of workpieces that require a measuring accuracy of 1.
How to read inch micrometers automation and metrology. Each vertical line represents onefortieth of an inch or. For the parallelplate and cone plate geometries, h pp. Standard test method for rubber propertyplasticity and. Optical micrometer for na2na2k levels free shipping. The finereading scale is uniform if its length is proportional to the tangent of the angle through which the plate is tilted and. Hold the mic squarely with the work or false readings will result. For micrometer head calibration, apply gage block stacks equivalent to 25, 50, 75 and 95% of the ti range. With this method, the effects of the electric field strength, electrolyte concentration, and ion species on the charging characteristics of the aqueous droplets was investigated. Parallelplate rheometer calibration using oil and computer simulation. Parallel plate capacitor theory a capacitor is able to store charge. The separation between the two plates can be set using an adjustable micrometer head with 0. Measure the diameter of the bearing with a micrometer. If the part happens to be bowed in the middle you could be out of parallel even though the mic says its good.
Oct 26, 2017 we developed an experimental method to determine the signal enhancement due to high. Leica gpm3 parallel plate micrometer optical survey. Each part or division is indicated by a vertical line. This makes both the na2 and nak2 into a precise and accurate level for deformation tasks or monitoring and industrial measuring projects. The fine reading scale is uniform if its length is proportional to the. New parallel plate micrometer for dsz2 na2 nak2 level. Leica gpm3 parallel plate micrometer kara company, inc. A plate of parallel glass placed in the convergent beam of a reading microscope is a useful means of. By turning the micrometer knob the parallel sided glass plate is tilted, thereby causing the line of sight to be raised or lowered. Similar to the 1960s zeiss opton ni 2 it is a combination of a compensated level and a separate parallel plate micrometer that allows readings down to 0. Besides those listed on the lead page of this section, this tool has these additional features. To improve accuracy a parallel plate micrometer can be fitted over the telescope objective. Plate flatness is measured relative to a reference surface such as a grinder table or granite table. Mar 29, 2019 orient the tested part on the surface plate.
Sitepro ft aluminum leveling rod, ftinch10ths 118t. The leica gpm3 parallelplate micrometer improves the accuracy and can be fitted over the leica na2 level. The instrument monitors two displacements on the mems platform, which measure the stress and strain in the sample. The micrometer can be configured to meet iso, astm, tappi, edana or other international specifications. Optical principles of the lyot micrometer the only optical component is a plate carved from a single uniaxial crystal of icelandic rock spar or calcite caco3 so that the angle between the crystallographic axis and the surface of the plate does not exceed 1 deviation from planarity has to be less than 1 4. Leica gpm3 parallel plate micrometer smith surveying equipment. Make ten measurements of the thickness tof the plastic dielectric plate. Measure the thickness of the plastic dielectric plate with the micrometer. The difference between the thickest and thinnest points on a plate ex.
The one built at this laboratory is provided with three plates, however, as this slightly facilitates the special work for which it was designed. Parallel plate capacitors introduction capacitors are a very integral part of electronics. The two outside plates rotate together while the middle plate rotltes in the opposite sense. This work proposed a novel method of investigating the charging characteristics of micrometer sized aqueous droplets based on parallel plate capacitor model. Its adjustable feature makes it possible to adjust it to exact size by micrometer measurement and also permits use in place of several solidtype parallels. Digital depth micrometers only need one scale to be verified. Allen precision equipment 1550 boggs road duluth, ga 30096, usa. Stage micrometer is an instrument used to calibrate images obtained at light microscope, allowing measurements and calculation of scale bars.
For internal measurements a 200 mm gauge block holder and two cylindrical jaws is provided. Clean the outside micrometers measuring surfaces and the gauge blocks to be used. Microngap rheooptics with parallel plates article pdf available in the journal of chemical physics 10720. Design and simulation analysis of mems parallel plate capacitor models for voltage conversion and power harvesting presented by manoj vasudeo sonje a candidate for the degree of master of science and hereby certify that in their opinion it is worthy of acceptance. It consists of a histological slide with microscopic. A parallel plate rheometer consists of two parallel discs, one of which rotates. Wild leica precise na2 level gpm3 parallel micrometer free shipping worldwide. The plate separation has now been set equal to the diameter of the precision ball bearing. Parallelplate capacitively coupled discharges ccds 21 are widely used for semiconductor etching, sputtering, and deposition applications. Laser and measurement receiver for machine alignment. Digital outside micrometers only need one scale to be verified. Std dev less than 1 mm per double run of levels over a km can be considered as precise glass diaphragms eye piece vertical line, levelling line and two stadia lines upper and lower 19. Accuracy with only the wild n3 being more accurate the na2gpm3 combination is a much more sophisticated instrument than the nk10 in my collection. The simplest capacitor is two parallel plates separated by some distance d, possibly with some material in the space between the plates.
Grasp the micrometer frame in your palm and turn the thimble with your thumb and finger. This optional accessory slips over the telescope objective and blends perfectly with the smooth lines of the na2. The capacitor in experiment 2 has two 10 cm x 10 cm metal plates of roughly a 1. Aluminum stand equipped with a lens, a mirror inclined 45, and an index. The micrometer offers a cantilever balance system to allow low pressure measurements. Leica universal series automatic levels optical levels. The alignment telescope figure 15 and 16 and the laser figure 17 are expensive instruments requiring skilled operators and will not be discussed here. Optical survey equipment leica gpm3 parallel plate micrometer. The most common applicator configuration is parallel plate, which is schematically shown in figure 10.
Calculating the relative permittivity constants of various. In this lab, the e ects of a capacitor on a square wave signal will be studied using an oscilloscope. Measuring close double stars with a lyot micrometer abstract. The finereading scale is uniform if its length is proportional to the tangent of the angle through which the plate is tilted and if the refractive index of the glass is 1. The parallel is useful as a gage in checking the size of slots and openings. The surface form is controlled similar to flatness with two parallel planes acting as its tolerance zone. As you slide one of the plates left or right relative to the other, the e ective area changes, as shown in figure 2. Std dev less than 1 mm per double run of levels over a km can be considered as precise glass diaphragms eye piece vertical line, levelling line and two.
However, the e ective area for a parallel plate capacitor is that which is common to both plates. Leica gpm3 parallel plate micrometer for na2 nak2 engineer. Clean the outside micrometer s measuring surfaces and the gauge blocks to be used. On the scale, seen in the gpm3s eyepiece, the amount of displacement is read directly to 0. Pdf comparative study of accuracy in distance measurement. The space between the electrodes is composed of sheaths, which are space charges with capacitive behavior, and the plasma body, which has an. Flatness is not related to thickness or parallelism. A compact surface plate 305 x 230 x 50 mm is included for precision depth measurements. Read the vernier scale that measures the plate separation, and if the reading is not zero, use this reading to correct readings of plate separation.
Always check the accuracy of a mic with a gauge block if it has been dropped or not used for a long time. Leica gpm3 parallel plate micrometer optical survey equipment. For example, a standard gage comparator will have a flat base. The micrometer sleeve is divided into forty equal parts. A capacitor comprised on two parallel conducting plates will then be studied. Pdf parallelplate rheometer calibration using oil and. Mems parallel plate rheometer for oscillatory shear micro. The starrett adjustable parallel provides a wide range of use in layout, gaging, inspection work and for setups on various machine tools. Monthly notices of the royal astronomical society, vol. The overlap area of the plates can be adjusted from 0 cm 2to 100 cm. Microscope with a traveling stage and an adjustable mirror. When testing the depth micrometer, one of the points must be near the lower limit that the instrument can measure, another somewhere in the middle, and the third near the upper limit. The amount of charge qit stores is proportional to the potential di erence v across it. A plate of parallel glass placed in the convergent beam of a reading microscope is a useful means of obtaining the finereading of a divided circle.
For the parallelplate and coneplate geometries, h pp. The device is used in precise levelling with invar line staffs graduated at 5 mm. When testing the depth micrometer, one of the points must be near the lower limit that the instrument can measure, another somewhere in. Usually the torque is measured on the rotating disc. Of these instruments, the alignment telescope is generally considered to be the most.
Zero the depth micrometer at the start when placed directly on the granite plate. Thickness, parallelism and flatness precision grinding, inc. Z nanolayers in parallel plate ionization chambers with micrometer spatial resolution. Parallel plate micrometer for dsz2 na2 nak2 level for. For digital micrometer with both english and metric units, one gage block should be. They can be used in many di erent ways to change an input signal. The parallel plate micrometer poynting 1905 journal of. Align the datum of the tested object onto the surface plate of the measuring equipment.
Investigation of the charging characteristics of micrometer. Gpm3 parallel plate micrometer for dsz2 na2 nak2 level and case. Parallels are adjustable and nonadjustable high grade steel blocks with precision ground parallel edges used for activities like precision spacing, transfer dimensioning, and fixed gono go gaging. Whether you are measuring parallelism with a simple ruler or with a precise technical instrument, the procedure is essentially the same. Pdf an alternative stage micrometer for use at light. Use the tweezers to discharge any residual charge on the capacitor by touching the lower plate and the base at the same time. By turning the micrometer knob the parallelsided glass plate is tilted, thereby causing the line of sight to be raised or lowered. Instruction of parallel plate capacitor experiments. Additionally 4 optical flats are supplied, for examining the flatness and parallelism of the measuring faces on external micrometers. We developed an experimental method to determine the signal enhancement due to high. If these two surfaces on the print are two planes you could have a part that is not parallel on if you check on a surface plate. The instrument consists of a parallel plate capacitor with variable d the distance between the plates and a the area the plates face each other, as shown in the figure below, another parallel plate capacitor with fixed d and a, plus a digital capacitance meter and a multimeter used to measure resistance.
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