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A new portable dual-stylus surface roughness measuring instrument


Contour, bearing curve (6) Operation 2.3 Instrument virtual instrument panel work (Figure 2) 3 computer controlled measuring instrument and equipment 3.1 driver circuit design computer controlled measuring instrument for the standard serial and parallel use of computer data acquisition, control bus flapper with 1SA: Listen does not have the advantages: common good, not to increase computer hardware overhead; applications directly with the portable computer interface, easy miniaturization of the system. The measuring instrument used computer printer adapter, parallel port, based on the Enhanced Parallel Port EPP protocol, data collection, MD conversion and stepper motor control. The data port, status port, control port addresses are Ox378H, Ox379H, Ox37AH. 1 Figure 23.2 Instrument Driver circuit design the circuit by the signal conditioning, filtering, A / D, such as stepper motor drive circuit. Inductance measurement circuit core is based on the new LVDT (linear variable differential transformer) signal processing chip, AD698, it is an integrated circuit chip solution r all the LVDT signal conditioning problems. LVDT connected to the same, just add a few external passive components to set frequency and gain can be converted to regular LVDT displacement adjustable DC voltage signal, the full-scale nonlinear distortion is 0.05% to significantly improve system accuracy and stability. Low-pass filter circuit can filter the sinusoidal modulation noise, vibration and mechanical movement suppress noise environment. Underway data acquisition system while mixing filtering role. To ensure accuracy and speed,[link widoczny dla zalogowanych], MD converter high-speed successive approximation Li Chuan MD chip 12-bit AD1674. In the data collection process by the generic array logic chip GAL16V8 generate A / D conversion and data read timing signals required. Computer through the printer port, optical isolators. Took control of eight four-phase stepper motor reaction, the step angle of 0.9. , Precision screw pitch 0.5real, it moves each step displacement (horizontal resolution) is 1.25. Stepper motor timing of work generated by the computer software. Figure 3,[link widoczny dla zalogowanych], signal conditioning, filtering software design schematic Qian 4, the main potato plug the measuring instrument software architecture is based on the IabwindcV1 analysis functions, virtual instrument panel cited (continued on page 13) * 9 * with a \ a hoop features fdb0-100-2DO a 300-400 (b] 00-l0.2030.4050.60.7080.91 one phase Zhou feature t.) \: \; j {\ !;!};;_. -:: I Figure 4 Frequency response of digital filter 8 Conclusion (c] 0l. 0l5o2 groan Xie, coral snail: oo foot carp Figure 5 Schematic diagram of the blood test simulation to teach data collection system, filter and phase shift of contradictions. Filter signal processing methods. applied to the rotor moving a nozzle hydraulic unit; Ping and. random signal processing. National Defense Industry Press, l996-5 balance tests,[link widoczny dla zalogowanych], to meet the needs of the phase and amplitude accuracy. 2 Wu Zhengyi and Testing Technology and Signal Processing, Tsinghua University a curse kettle stupid curse - Lan Ji Liu, F ~ belly & days, 19 so 9o., Io ~ programming language is blind. Xi'an Xiao Chun Li Electronics Ramie Ramie Tang Pi Chi basket ... ... ~ accurately estimated. More importantly, it basically solved the balancing of a '... a c on the next page 9} eight convenient for users to use and reduce the misuse rate. 5 test results after calibration equipment. author conducted a large number of experiments to verify the accuracy and repeatability, this gives some typical measurement result: Ra = 4.089pm, 0.344pm multi-model repeated measures groove l0 times and the results are as follows:} J model for more than eight sturgeon instrument readings indicated the value of seeking change in indication of poor J Ra = 4.Onl4.092f0.0B% l0.99% Ra = O ・ 344pmJ0-34 white l archery 0.58% J2 ・ 82% measurement of a workpiece turning somewhere ( 10) Ra mean of 5.959,[link widoczny dla zalogowanych], ttm. indication of change of the 0.8l%. with a T at lysu measurement of surface roughness Ra measured mean value of the premises 5.942 Ⅻ ・, indication error of 0.29%. 6 Conclusion The instrument design, the following innovations: ① measured by dual-needle structure, expanding the scope of application; ② signal conditioning circuit A1) 698, high precision, small distortion; ③ operate virtual instrument panel, easy to use. Reference 1b. ldw set,[link widoczny dla zalogowanych], 1. I ~ t'8 Man dish Tsui I, I'IATIONh. Llt '~ tllt. . t. Post 2l spit Qin M:,, _ww. e, d. on ・ l ・

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