校准和精度认证

Digi-Pas^® 双轴精密数码倾角仪相比于常规单轴水平测量仪器的优势是:

传统气泡水平仪、钟摆式数码水平仪和倾角仪的局限性在于：1)单轴, 2)测量角度范围小, 3)仪器尺寸大。而精确水平及角度测量、校准和表面平面度分析等都是二维平面操作，仅靠两条独立的垂直线进行测量是不够的。Digi-Pas双轴精密数码倾角仪采用先进的MEMS技术，使其具备了同步双轴测量和广泛的角度测量范围能力。这是传统单轴数字/气泡水平仪所不具备的。

• 高效省时--- 通过双轴MEMS技术，在二维(X-Y)平面进行的找平和角度测量操作（俯仰和滚动）可同时进行，彻底告别了使用传统单轴水平仪校准精密机器时必须经历的乏味的反复试错过程。那种重复而单调的调整操作耗时费力而且低效率，技术人员很容易丧失工作热情。此外，一套Digi-Pas双轴数码水平仪就能替代2套单轴数码水平仪完成相同任务，从而能够节约成本。

• 可信可靠--- Digi-Pas^®双轴MEMS技术的倾角仪已通过专有先进制造工艺专利技术，对非线性和工作温度变化进行了补偿和校准。其在宽测量范围内的测角准确度和稳定性能获得了诸如NIST、UKAS、DIN和JIS等第三方独立认证机构的验证认可。由于具备双轴操作、大角度测量范围及测振仪功能等优势， ^®倾角仪绝不仅仅是水平测量工具，它为平面角度平整、测量、诊断和校准提供了一个全面的解决方案。

  

  

• 严谨高质--- 它具有显示数值和图形数据的数显牛眼及内置测振仪。机器安装人员可实时监控和指导校准操作，并能通过对待校准机器安装前后的状态进行比较，确认其位置变化稳定度。此外，双轴智能牛眼避免了传统气泡水平仪依赖人眼观察和经验值所产生的误差。

• 高效省时---可通过无线或USB与电脑或移动设备连接，实现“单人操作”。

  

使用Digi-Pas^®双轴倾角仪意味着机器安装将更加省时，保养维修将更加高效，操作将更加专业，大限度地提高精密机械性能，为用户提升产品质量（如精度和产量）和更高的满意度。

Digi-Pas^® 双轴数码倾角仪为精密水平和角度测量提供了一个全面解决方案，是替代过时的气泡水平仪和角度测量范围有限的传统单轴数码水平仪的最好选择。

©2024 DIGIPAS TECHNOLOGIES INC. All Rights Reserved

Digi-Pas^® 精密数字水准仪和测斜仪的准确性和可靠性

Three-Point Contact Base of Digi-Pas^® 2-axis Precision Inclinometer

1. Limitations of conventional rectangular contact base levelling instrument

   The contact base surface finish quality of a typical conventional leveling instrument or inclinometer is one of the critical determinants of accuracy performance and common rectangular-shape flat surface often suffer from geometrical deviation resulting from:

   • Waviness and unevenness

   • Irregularities due to distorted or worn surface

   • Dust and dirt trapped or surface roughness

   Figure 1 illustrates three typical poor surface finishes of conventional rectangular surface four-point contact base. The unstable surface-to-surface contact causes 'rocking' which results in measurement inaccuracy derived from inconsistent readings. A common practice to improve the outcome under such constraint is by taking more samples to obtain an averaged reading. However, this time-consuming and repetitive activity often promotes boredom that succumb engineers to resort for compromising works, especially when the instrument is located at some distance.

   

   Although high quality surface requires both flatness and smoothness, it is difficult and expensive to control in machining of metal alloy surface particularly when involving relatively large area. Increasing the flatness and smoothness of a few microns would usually increase exponentially on its manufacturing costs. This often results in a trade-off between the manufacturing costs of the instrument and thus compromises its accuracy performance.

   In addition, the rectangular contact base surface of a conventional leveling instrument is also susceptible to target measuring surface unevenness, which is another factor affecting levelling and measurement accuracy. Figure 2 illustrates issues associated when a rectangular contact base of a traditional single-axis spirit level is placed on a typical machined surface having low frequency, long wavelength flatness variation. It is clearly shown that full and stable surface-to-surface contact could not be achieved between the instrument base and the measuring surface. The contact may cause rocking that results in measurement errors, hence affects the accuracy and reliability of the leveling outcome. E.g. a 3µm of surface unevenness along the length of a typical 20µm/m resolution spirit machinist level of 130mm would result in 0.001° error

   

2. Digi-Pas^® concave contact base versus 'perfectly flat' contact base structures

   Often, dents are easily generated on smooth metal base area of an instrument resulting from rough handling. A protruding dent formed at any location near the middle of a 'perfectly flat' metal base simply causes rocking which results in measurement error or inaccuracy. To minimize these errors, Digi-Pas® instrument metal surface base has been deliberately designed and machined to form a concave 4-points contact base specifically target to prevent rocking caused by small protruding dents or foreign particles formed at the center of device’s base. Figure 3 illustrates the inferiority of a 'perfectly flat' base of conventional instruments against the improved design of Digi-Pas® concaved 4-point base when small dents/particles exist at the center of device’s base. It is obvious that small dents or particles exist near the middle of the base shall not affect stability of Digi-Pas® instrument as it is supported by both ends having precisely machined stable contacts to the targeted measurement surface.

   

   On the other hand, dents formed at the both ends of the instrument may not necessarily cause significant rocking. When dents happen at these both ends, an offset value/reading caused by these dents can be easily removed using Digi-Pas® calibration or Absolute Level feature (see "Accuracy Performance"). In contrast, a protruding dent formed at the middle of the device’s base destabilizes the device with severe rocking during measurement which cannot be resolved by using calibration or Absolute Level feature. This phenomenon does not only affect the instrument's initial offset value, it also affects the repeatability of measurement reading.

   Thus, the contact surface approaching the base center of instrument is deliberately being designed with a concave profile to minimize the above issue, providing improved stability of measurement readings as well as enhances accuracy of the instrument.

3. Pioneering the application of 3-point contact base in 2-axis precision levelling instrument

   In view of the constraints inherent in conventional contact base measuring instrument described in the foregoing, Digi-Pas® pioneered and patented the utility of 3-point contact base for its 2-axis precision angular and surface flatness measurement instruments. The triangular shape of 3-point contact base seeks to address the shortcomings associated with conventional rectangular contact base.

   

   

   When a 3-point contact base leveling instrument is placed on either flat or uneven surface object (e.g. typically machined metal surface) as shown in figure 4 and 5 respectively, the three-point frame serves as a triangle-plane platform for supporting the weight and maintaining the stability of the instrument. It provides maximum stability and strength against downward forces and horizontal forces as well as movements about horizontal axes. With the sturdy three-point stand, a most stable 3-point-to-surface contact can be established without rocking and thus achieving consistent leveling readings of the two-dimensional measuring surface. Any angular deviations on the surface area is detected by Digi-Pas^® 2-axis inclinometer as sensitive contact points touch on a particular section of uneven surface area.

4. Advantages of Digi-Pas^® 3-point contact base levelling instrument

   In 2009, Digi-Pas^® pioneered and patented the utility of 3-points contact base to its world-first 2-axis precision digital level series that effectively prevent any surface dimensional deviation caused by unevenness of its own instrument’s metal surface contact base. Figure 6 illustrates the 3-point contact base screws made of harden steel and titanium materials that offers great stability and prevent it from ‘rocking’ when placed on either flat or uneven smooth surface for 2D levelling and planar angular measurement.

   

   Maintaining the 3-points contact is easy, speedy and cost effective simply by replacing the harden/titanium screws whenever they wear off, saving significant amount of time and cost as compared to maintain the instrument’s contact base surface finish through standard machining. Device accuracy performance can also be re-calibrated by performing User Self-Calibration or "Absolute Level" setting at ease. Please refer to user manual for detail instructions.

   For using Digi-Pas^® 2-axis inclinometer to level an object having a very rough top surface, the 3-point harden/titanium screws can be temporarily removed and use the flat base surface to naturally average the rough surface. Absolute Level Setting is required to be performed immediately after changing the base to ensure the instrument maintains its reference accuracy. However, in high precision leveling, angular measurement and surface profiling tasks usually involve high quality flatness and smooth surfaces such as granite and metal alloy machined surfaces. Hence, 3-point contact base is still a better choice.

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