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Caliper contrast old and new test procedures and analysis


Interaction between the various parts, \shaking \groove surface by the cursor to the ruler edge groove surface of the body caused by the distance,[link widoczny dla zalogowanych], the thickness of the edge the cursor is certain, if the foot body and foot box with too much space,[link widoczny dla zalogowanych], will face Lu edge line marking to the main line and side-foot carved from the instability, thus increasing the possibility of parallax. but also make the blade gap within the jaws of the side instability of the blade the size of the jaws 3.. in the amount of arc claw size and parallel provisions, the new order of indexing is 0.05mm, 0.10mm vernier caliper parallel degree 0.Olmm (the old rules were 0.02ram and 0.0 ~ mm),[link widoczny dla zalogowanych], increased caliper the accuracy of the size 4.. on the edge of the test within the jaws, the new regulations remove the \jaws parallel to 0.Olmm; use the division value 0.02ram a vernier caliper to 0.Olmm, dividing the value of 0.05 metrology 1999. № 40.05ram and 0.10ram a vernier caliper to 0.. 15ram . so that the knife-edge test within a more reasonable amount of claws 5.. on the indication error of the test. a new point of order in the subjects in each side and the outer end of the size difference between the two positions have specific requirements, the following table (the old rules can not exceed the error of indication). vernier caliper structure does not meet the Abbe principle. Therefore, it is the existence of a measurement process Abbe error, the size of the workpiece, the workpiece-foot distance from the main larger errors on the parameters of the new procedures improved, so that the measurement of performance has been a vernier caliper to ensure that the table (mm) size range 0 ~ 200> 2oo ~ 500> 500 ~ 1000 division value 0.020.050.10 point in each side and inspected the outer end of the difference between size 0 . Ol0.030.050.020.050.050.040.050.10 Jitter Calibration Testing Device Benjamin Cheung (Tianjin Electronic Instrument l Station, Tianjin 300210) D /-I06 Abstract This article describes the use of Bessel function zero method and spectral composition of the jitter amplitude ratio method calibrator verification device, according to their performance, and a basic principle of the definition under the shake-style: Dv-v = a 2 \peak} is the line frequency jitter, the time when the oCIR, f: 15625Hz, when f is the time for a NTSC 15750I-Iz) AT for the line width of the frequency interval of a cycle, when the time for the CCIR AT = 64.00.us, AT a time when the NTSC 63.49.us;, zf is offset, Af = mt ・;, the FM index;, _ as the modulation frequency. According to modulation theory, crossing the spectrum of FM expansion, line frequency (ie carrier frequency ) and the sideband amplitude of the J (m,) a 0,1 ... ... natural number), with the frequency modulation index m, the curve shown in Figure 1. can be seen from Figure 1, the value of some ml, with the () of the order, J Bessel function of zero amplitude of the spectrum there, these studies can be accurately calculated values, and identified by a special form, such as a 0, J. (), 1 the first 1 root value mt, a 2. 4048 .= 2, the value of the first two roots, a 5.5201, etc., because,, △ D fork can be accurately measured, so the use of equation (1) jitter can be accurately set D,[link widoczny dla zalogowanych], a value for the alignment jitter Calibrator scale error of indication applications. in D for the fixed value (here 0.1O0 ~ s) case,[link widoczny dla zalogowanych], to change the value, use equation (1) mt corresponding values calculated by the theoretical calculation Jo (talk) / g. ( O) or J (,) / Jo (O) ratio can be considered as exact values, so the ratio of the amplitude of the available spectrum statutory fork out jitter D of a calibrator value test jitter modulation frequency response error indication, the basic scale display jitter calibrator value of the reference error: = × 100% (2) where, _, (I】 set by [『LL] A Man 2 璺 amount (my'j-dry = [b J a (c) two side band components J coupling) ll a 7rlllII '.:! a wide r11, _T-: = _, I, bandits J, l. modulation index bamboo circle were seized Table 1 shows the value of jitter; D for the use of a shell ● j ¨ ¨. We ¨ a. I. dragonfly l9} Clan * a Zhao indigo

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