ASME B89.1.10M:2001 pdf free download

ASME B89.1.10M:2001 pdf free download.DIAL INDICATORS (FOR LINEAR MEASUREMENTS).
2 REFERENCES
CS(E) I 19-45 Dial Indicators (For Linear Measurements) Publisher: Department of Commerce. 1401 Constitution Avenue NW. Washington, DC’ 20230
A-A-2348B Indicator, Dial, Accessories, and Test Set
Publisher: General Services Administration, 1800 F Street NW. Washington. DC 20405
MIL-I-8422D Indicators. Dial and Accessories
Publisher: National Technical Information Service (NTIS). 5285 Port Royal Road. Springfield VA 22161
ISO R1463 Dial Gauges Reading in 0.01 mm. 0.001 in. and 0000l in.
Publisher: International Organization for Standardization (ISO), I rue de Varcmbé, Case Postale 56. CA1211, Gencve, Swiizcrland.Suisse
3 GLOSSARY
dial indicator: a measuring instrument in which small displacements of a spindle or a lever arc magnifie by suitable mechanical means to a pointer rotating in front of a circular dial having a graduated scale.
error of indication: the amount by which the displayed value on a measurement device differs &om the true input.
4 CLASSIFICATION BY TYPE
(a) Type A. Dial indicators in which the spindle is parallel to the dial face (see Fig. I).
An electronic indicator is a self-contained measuring instrument intended to perform the same function as a mechanical dial indicator. Displacements of a spindle or lever are detected by suitable electronic means and are displayed on a digital display, which is an integral part of the instrument.
B2 GENERAL
The use of electronic indicators and mechanical dial indicators are the same, so much of this Standard is directly applicable to either style of indicator. Some areas of this Standard, however, contain tenninology and requirements that do not apply to some features and performance characteristics of electronic indicators. This Appendix will auempt to standardiie a methodology for determining the accuracy of electronic indicators to facilitate mutual understanding between manufacturers and consumers.
B3 DIMENSIONAL CONSTRAINTS
To ensure mterchangeability between Type A dial indicators and electronic indicators in industrial applications. individual manufacturers shall indicate, in their catalogs and literature, conformance to appropriate dimensions (see Fig. I) with the symbol AD (American Gage Dcsign.
B4 DISPLAYS
The numbers on the display shall have good contrast with the background. and the least-count digit shall agree with the analog reading (if present) within one digit of the least cowit. If the device loses count (e.g., due to a low battery condition or too quick of a spindle movement) an appropriate error indication will appear on the display.
B5 UNITS OF MEASURE AND RESOLUTION
Electronic indicators shall have minimum digital resolutions corresponding to the dial graduation classes for dial indicators as given in pam. 6. or higher resolutions leg.. 0.00001 in. (0,0002 mm) or 0.00002 in. (0.0005 mm)]. Analog-style displays or other display symbols shall be considered secondary to thc digital display. Analog number markings (if present) shall correspond with paras. 8.2.6 and 8.2.7. Thc face of the instrument shall clearly indicate which system of wilts is currently being displayed.
B6 ACCURACY
In assessing the accuracy of an electronic indicator. the following factors should be considered:
(a) overall magnifcatioii and linearity
(b) accuracy of interpolation between scale elements of the indicator’s encoder
(c) contribution due to the uncertainty of the least digit
(d) repeatability
(e) hysteresis
By nature of digital display systems, assuming the last digit represents a rounded-off value, the accuracy cannot he better than *‘/2 the minimum displayed digit. The uncertainty is a uniform distribution with a width of one digit. The digitization of the data contributes an effective standard deviation of 1/2 the value of the least digit divided by 3 to the evaluation of the uncertainty of measurement.
Calibration of electronic indicators should be performed by standards or instruments of known accuracy. The inaccuracies of the standards or instrumentation should preferably be less than 10% of the accuracy rcquircmcnt. of the indicator under test, and should not be greater than 25% of that value.
Electronic indicators should meet the following accuracy requirements.