1、12 August 2011 SH12666IEEE Std 813-1988Errata to IEEE Specification Format Guide and Test Procedure for Two-Degree-of Freedom Dynamically Tuned GyrosSponsorGyro and Accelerometer Panel Committeeof theIEEE Aerospace and Electronic Systems SocietyCorrection SheetIssued 12 August 2011Copyright 2011 by
2、the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 2011.Printed in the United States of America.This correction sheet may be freely reproduced and distributed in order to maintain the utility and currency of theunderlying Standard. This correction sheet may no
3、t be sold, licensed or otherwise distributed for any commercialpurposes whatsoever. The content of this correction sheet may not be modified.Correction Sheet to IEEE Std 813-1988SH12666 12 August 2011Table of Contents, Page vii, should be corrected to read as follows:10.13 Dynamic Time Constant.563.
4、3.10.7, Page 6, sentence should be corrected to read as follows:The One-N (1N) modulation shall not exceed _ mV rms, peak-to-peak.3.3.11.2.2, Page 7, sentence should be corrected to read as follows:The difference between the command rate scale factor measured with positive and negative input rates s
5、hall not exceed_ (rad/s)/mA, (rad/h)/mA, (/s)/mA (/h)/mA.3.3.11.3.1, Page 7, sentence should be corrected to read as follows:The change in command rate scale factor resulting from a change in steady-state operating temperature shallbe _ _ (rad/s)/mA)/C, (rad/h)/mA)/C, (/s)/mA)/C, (/h)/mA)/C3.3.14.1,
6、 Page 8, sentence should be corrected to read as follows:D(y)F, D(x)F, 0 _ /h.3.3.23, Page 10, sentence should be corrected to read as follows:_ /h maximum spread, 1 ,_, each axis for a period of _ minutes, hours, days,_.3.3.28.1, Page 12, sentence should be corrected to read as follows:_ g cm2/s, d
7、yn cm s.3.5.1, Page 17, sentence should be corrected to read as follows:The electrical circuits shall be connected as shown in drawing number _, Fig _.3.6.4.1.2, Page 23, the text in the box should be corrected to include the last sentence as shown below:3.6.4.4, Page 23, the second sentence should
8、be corrected to read as follows:The gyro shall perform within specification after positive and negative angular accelerations of _rad/s2, /s2 have been applied about the _ axis, axes for _ seconds a total of _ timesper direction.3.6.4.8, Page 24, sentence should be corrected to read as follows:_ Pa,
9、 torr, in Hg, lbf/in2 to _ Pa, torr, in Hg, lbf/in26.3, Page 32, the y-axis is missing the symbol Theta in three places, should be corrected to read asfollows:I C( ) KD(X x) KQ(Y y)1H- xXxAxes shall be defined. When available, supply the specific vibration characteristics including dwellfrequencies,
10、 frequency spectrum time duration, etc.If exposure to random vibration is required, power spectral density, bandwidth, peak accelerationlevel and duration shall be specified.Correction Sheet to IEEE Std 813-1988SH12666 12 August 2011Page 32, ACCELERATION-SQUARED-SENSITIVE DRIFT RATE, should be corre
11、cted to read asfollows:+ D(y)XZaX aZ+ D(y)YZaYaZ6.3, Page 33, the x-axis is missing the symbol Theta in three places, should be corrected to read asfollows:I C( ) KD(Y y) + KQ (X x)Page 33, ACCELERATION-SQUARED-SENSITIVE DRIFT RATE, should be corrected to read asfollows:+ D(x)XZaXaZ+ D(x)YZaYaZ6.3,
12、Page 33, Model Equation, the last three items of the “where list” should be corrected to read asfollows:D(y)XaX= drift rate about the y axis, attributable to acceleration along the X axis, where D(y)Xisa drift rate coefficientD(y)YaY= drift rate about the y axis, attributable to acceleration along t
13、he Y axis, where D(y)Yisa drift rate coefficientD(y)ZaZ= drift rate about the y axis attributable to acceleration along the Z axis where D(y)Zis adrift rate coefficient9.1.1.4.3, Page 36, item 1) should be corrected to read as follows:1) Acceleration: _ rad/s2maximum9.1.3.1, Page 36, item 7) should
14、be corrected to read as follows:7) Phase-splitting capacitor: _ _ F10.13, Page 56, title of subclause should be corrected to read as follows:Dynamic Time Constant10.2.2.1, Page 40, the sentence should be corrected to read as follows:The purpose of this test is to ascertain that a circuit element or
15、component part of the gyro can operate safelyat its rated voltage and withstand momentary overpotentials due to switching, surges, etc, by measuring theleakage current between isolated circuits and between the gyro case and the circuits isolated from the gyrocase.10.6.3.2, Page 45, second sentence o
16、f the first paragraph should be corrected to read as follows:Using the torquer, rotate the gyro rotor until the pickoff output at the previously measured phase angle is aminimum. Record this voltage as the in-phase null, a voltage 90 out-of-phase with this voltage as thequadrature voltage, and the t
17、otal voltage.10.14.3.4.3, Page 61, first sentence of the third paragraph should be corrected to read as follows:Begin a second accumulation of pulses. After _ seconds, T2, unlock the table and oscillate it at a fre-quency of_ _ Hz and a peak amplitude of _ _ , rad.1H- yYyCorrection Sheet to IEEE Std
18、 813-1988SH12666 12 August 201110.14.3.5, Page 62, item 2 should be corrected to read as follows:2) Two-N (2N) Translational Sensitivity. Mount the gyro in the fixture on the linear vibrator with the Z axisnominally perpendicular to the direction of vibration. Operate the gyro in the angular rate se
19、nsing mode (see8.2) in accordance with the test conditions of 9.1. Record the X and Y torquer currents, , and , prior tovibration. Apply a linear sinusoidal vibration at a frequency locked to twice the gyro spin speed at anamplitude equivalent to _g peak-to-peak, rms, _. Vary the phase between the v
20、ibrator andgyro motor frequencies to obtain maximum X torquer current . Record and the Y torquer current .Subsequently vary the phase to obtain maximum Y torquer current . Record and the X torquercurrent .10.14.4.8.1, Page 67, first paragraph should be corrected to read as follows:Divide the recordi
21、ng of the gyro X and Y torquer currents obtained in 10.14.3.9 into L equal time intervalsof _, Mins. Determine the average X and Y torquer currents during each interval. The random driftrates (1 ) are then calculated as:10.14.4.8.1, Page 68, the sentence should be corrected to read as follows:where
22、Vi is the average value of the ith sample, V is the mean value of the L samples, and KTO is the nominalgyro command rate scale factor as determined in 10.7.4.1. The random drift rates shall conform to therequirements of Section _.10.17.3.1, Page 73, item 3 should be corrected to read as follows:Meth
23、od 1C. Connect the gyro torquer to the current integrator and recording equipment. Start the recorderand record the output for _ min, h . Repeat with the other axis oriented east.Annex C, Page 82 the equations in the where list should be on one line as shown below:Annex C, Page 82, in the where list
24、; the following line should be corrected to read as follows:s= angular velocity of rotor about spin axisAnnex C, Page 83, Equation C-3 and Equation C-4 should be corrected to read as follows:C-3C-4Annex C, Page 84, the second paragraph immediately after the where list should be corrected to readas f
25、ollows: We can get some idea of the effect of case motion with the use of a series of block diagrams showing theDTG in various degrees of complexity starting with the simplified configuration (that is, Eqs C-5 and C-6).iX1iY1iX2iX2iY2iY3iY3iX3qx= a2-xasyac2-s2x+qy= a2-y a sxac2-s2yIxfxKDxJsyKQy+ + + Mx=IyfyKDyJsx KQx+ My=
