_:n344550b2e6454ce9aa815274bc8b9b83xb74
<http://schema.org/text>
"Portable surface roughness testers are important tools when it comes to the testing a product’s surface roughness. Surface roughness has important ramifications to the wear and tear of a product as well as its ability to adhere to other surfaces. It is no surprise that many quality testing processes check the surface roughness of products as part of quality testing. For these purposes, a portable surface roughness tester is convenient and can be used at multiple points across a construction site. For a portable surface roughness tester to be really useful to the quality control process, it needs to have the following measuring functions.\n\nParameters to Look For in a Surface Roughness Tester\n\nChoice of Sampling Length, l, is the nominal wavelength used for separating roughness and waviness. Also known as Cutoff Length or Cutoff. Evaluation Length, L, is the length over which the values of surface parameters are evaluated. It is recommended that the evaluation length consist of five sampling lengths although it may comprise any number of sampling lengths. Also known as Assessment Length. Mean Line, M, is the reference line about which the profile deviations are measured. The mean line of the roughness profile is usually established by analog or digital filters with the selected cutoff corresponding to the roughness sampling length.\n\nProfile Peak is the point of maximum height on a portion of a profile that lies above the mean line and between two intersections of the profile with the mean line Profile Valley is the point of maximum depth on a portion of a profile that lies below the mean line and between two intersections of the profile with the mean line. Profile Irregularity is a profile peak and the adjacent profile valley.\n\nRoughness Average, Ra, is the arithmetic average of the absolute values of the profile heights over the evaluation length.\nRMS Roughness, Rq, is the root mean square average of the profile heights over the evaluation length\nMaximum Profile Peak Height, Rp, the distance between the highest point of the profile and the mean line within the evaluation length.\nAverage Maximum Profile Peak Height, Rpm, is the average of the successive values of Rpi calculated over the evaluation length.\nMaximum Profile Valley Depth, Rv, is the distance between the deepest valley of the profile and the mean line within the evaluation length\nMaximum Height of the Profile, Rt, the vertical distance between the highest and lowest points of the profile within the evaluation length.\nMaximum Heights within a Sampling Length, Rti, the vertical distance between the highest and lowest points of the profile within a sampling length.\nAverage Maximum Height of the Profile, Rz, is the average of the successive values of Rti calculated over the evaluation length. This parameter is the same as Rz(DIN) when there are five sampling lengths within the evaluation length.\nMaximum Roughness Depth, Rmax, is the largest of the successive values of Rti calculated over the evaluation length\nTen Point Height of Irregularities, Rz(ISO), is the average value of the absolute values of the heights of five highest profile peaks and the depths of five deepest valleys within the evaluation length\nSkewness, Rsk, is a measure of the asymmetry of the profile about the mean line. A negative skewness indicates that a greater percentage of the profile is above the mean line and a positive value indicates that a greater percentage is below the mean line\nPeak Density, Pc, is the number of SAE peaks per unit length measured at a specified peak count level. Note: An SAE peak (ANSI/ASME B46.1.1-1995) is a profile irregularity wherein the profile intersects consecutively a lower and upper boundary line.\nTen Point Height of Irregularities, Rz(ISO), is the average value of the absolute values of the heights of five highest profile peaks and the depths of five deepest valleys within the evaluation\nThird Maximum Peak-to-Valley Height, R3z, is the mean of the third maximum peak-to-valley heights in the evaluation length.\nCore Roughness, Rk, is the core height of the profile along the Yaxis of the BAC curve generated by placing a 40% line on the curve at the minimum slope point and extending the lines to the 0% and 100% points.\nReduced Peak Height, Rpk, is the height on the Y-axis of a triangle with the same area as the BAC curve from the 0% point to the Mr1 point.\nReduced Valley Depth, Rvk, is the height on the Y-axis of a triangle with the same area as the BAC curve from the Mr2 point to the 100% point.\n Peak Height, Rpk*, is the distance between the highest profile peak and the intersection line of the surface ratio Mr1.\nValley Depth, Rvk*, is the distance between the intersection line of the surface ratio Mr2 and the deepest valley.\nRetention Volume, Vo, is the area between the material ratio curve and the 100% material line below the core roughness.\nAdditional Parameters\n\nRMS Slope, Dq, is the root mean square average of the rate of change of the profile height calculated over the evaluation length.\nAverage Wavelength, la, is the average wavelength of the surface profile.\nRMS Profile Wavelength, lq, is the RMS value of the profile wavelength.\nHeight Difference of Bearing Length Ratios, Htp, is the height difference between two points on the bearing ratio curve set at specified levels of tp, tp1 and tp2.\nRecalculation\n\nPortable surface roughness testers should be able to recalculate previously collected data for use in other evaluations. This means that the device must have the functionality to take stored data and re-analyze it after changing its previously set profile and roughness parameters.\n\nVarying Evaluation Conditions\n\nSometimes, quality control staff may like to analyze a set of data under two varying conditions. Portable surface roughness testers need to be able to switch between one set of evaluation condition to another and processes the same data under the two conditions. This saves time and enhances efficiency as the staff does not need to actually run the test twice under two different conditions.\n\nAbility to Measure Narrow Spaces\n\nPortable surface roughness testers need to be able to measure narrow spaces such as the grooves on a piston ring. Portable surface roughness testers can do this by utilizing the narrow part measuring function. This reduces the run-up distance (that the machine needs to start measurement) from the typical 0.5mm to a significantly shorter 0.15mm.\n\nReal Sampling\n\nPortable surface roughness testers need to have the capability to do real sampling by sampling stylus displacement for a set period of time. This takes place without engaging detector traverse. By doing this, the portable surface roughness tester acts as a displacement gage or a vibration meter.\n\nPortable surface roughness testers with the following features or more can make it really easy for quality control analysts to collect, analyze and manipulate data to gain as much information as possible from it.\n\nSome skidless surface roughness testers allow for the following:\n\nContour Analysis Function\n\nThis function allows the portable surface roughness tester to perform contour analysis using data collected during the surface roughness test. This contour data looks at step height, area and coordinate variations within a surface. This is particularly useful when measuring very small objects whose size make it impossible to use a contour measuring device."
<https://willrich.com/shop/cmm-sensors-probes-styli/zeiss-2/datum-products-for-zeiss/>