校准证书

对客户而言,测量仪器和测量工具的精度和可靠性是非常重要的, Digi-Pas® 数码水平仪利用我们自主研发的专利技术,可以对非线性和温度变化进行补偿和校准。多家认证机构运用超高精度的转台水平仪检定仪和角度干涉仪对我们的产品测试后证实:产品精度和稳定性已经得到显著提高。

Digi-Pas® 产品的校准证书全部来自知名的第三方测试机构和国际计量局旗下多家国家校准实验室(在中国,为中国计量测试研究院)。依照CE, FCC, RoHS的要求,Digi-Pas®的产品通过TÜV SÜD, SGS的测试, 产品的参数已经得到美国,日本,英国,德国多家知名校准和测试实验室的验证,依照国际实验室认证联盟和美国实验室认可协会的相关标准,并参照 NIST, JIS, UKAS & DIN标准,以确保产品的合格评定在全世界都被接受。

按照ISO9001的规程,Digi-Pas® 保留校准认证文件的副本,并按照相关组织和权威机构要求,随时更新以保证相关文件的有效性。 如需最新的文件,请填写“联系我们”处的表格。

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 its accuracy performance and the common rectangular-shape flat surface often suffers 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 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.

    Figure 1 Poor surface finishes of typical levelling instrument contact base and implications
    Figure 1: Poor surface finishes of typical levelling instrument contact base and implications

    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.

    Figure 2: Conventional single-axis contact base on a two-dimensional uneven plane
    Figure 2: Conventional single-axis contact base on a two-dimensional uneven plane
  2. 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.

    Figure 3: Stable 3-point-to-surface contact between Digi-Pas® inclinometer and flat surface object
    Figure 3: Stable 3-point-to-surface contact between Digi-Pas® inclinometer and flat surface object
    Figure 4: Stable 3-point-to-surface contact between inclinometer and uneven surface
    Figure 4: Stable 3-point-to-surface contact between inclinometer and uneven surface

    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 3 and 4 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.


  3. 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 5 illustrates the 3-point contact base screws made of harden steel and titanium materials that offers great stability of and prevent it from ‘rocking’ when placed on either flat or uneven smooth surface for 2D levelling and planar angular measurement.

    Figure 5: Digi-Pas<sup>®</sup> patented 2-Axis Precision inclinometer utilizing 3-Point Contact Base
    Figure 5: Digi-Pas® patented 2-Axis Precision inclinometer utilizing 3-Point Contact Base

    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 a better choice.

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