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 Wysłany: Pon 3:18, 13 Gru 2010 Temat postu: tory burch shoes High voltage table discussions _3 |
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High voltage table discussions frequency error test
. When you need to reference the error into a relative error that,[link widoczny dla zalogowanych], in accordance with the definition of relative error can handle and a spout (1) rewritten as ~】 a Sl00lIn == × joo0 / -, (2) rt .... ... 0 when n is small. Type (2) can be approximated as J ≈ (, o / c) × 100 () measurement technology l996. № 32. Frequency of additional error. From the perspective of the Friends of the error, should not include or contain other errors as possible factors not only deviate from the operating frequency of a given degree of error factors of the frequency generated by this additional error. General, it is the expression of the relative error, that is ×] oo% v where: ‰ is the degree of frequency setting voltage standard readings; ur checklist is the same when maintain o scale, operating frequency, the voltage standard readings. Visible. Degree of frequency in the set, the voltage measured by voltmeter \Although the index values unchanged voltmeter. However, the voltage measured \This is the additional frequency error of the voltmeter means. To implement equation (3) the relationship of the certification / calibration scale voltmeter must maintain the same position, which is the so-called \, only the amount of change in the frequency of the error factors (without regard to the short-term voltage instability of the standard). If you want to know any frequency voltmeter measure the voltage when the relative error. brake using equation (2) and (3) the relationship between ,[link widoczny dla zalogowanych], under the premise of ignoring the higher order small quantity. and the relative error is approximately d ≈. + m () 3. In the late 7O, the broader domestic use of thermistor probe high frequency voltage standard as the frequency of additional type voltmeter Error check Cave / branch quasi-standard devices. Since thermistor temperature dependence of large, complex operation,[link widoczny dla zalogowanych], and most are not direct reading, therefore, the use of \the principle of the test, proposed the \resistive voltage standards welcome, because it makes use of thermistor voltage standard test / calibration frequency of additional error voltage meter simple convenient. Additional error expression is its frequency: d1 a × 100 (5) where: u is the voltage meter in the frequency, time of reading; u is the voltage table in the reading given degree of frequency; is the standard voltage indication. Note that the. ? and u are standard in the voltage readings too. It was further skill (5) is approximately as follows: a × l00 (5r) t 'style (5) than equation (5), the more easy to use. from the form view, equation (5) and (3) is similar , but the fact that there are differences between the two formulas: J). Equation (5) is the formula (5) approximation. it contains the approximation error factor; 2). regardless of type (5) or formula (5 ') in the , u is the voltage meter was seized with the basic values of error factors, and u is the examination table with both a basic error by factors that also contain additional error factor in the value of the frequency. Since U ... so they can not offset the basic error factors, hence the equation (5) or equation (5) additional frequency error of the expression.,[link widoczny dla zalogowanych], or J is the fundamental error of the frequency with additional error. Only when the basic error of the table was seized small o and voltage close to the standard error of only that 1f a J,, so were seized by the fixed standard time \(3) is the character sets defined as the relative error is defined as [measured value (agreement) true value] / (contract) true value, while the formula (5) or type () is not so strict. . Early probe type voltage vacuum diode for the table is cross examination components, so most of the voltmeter voltage range of 0. J ~ 300V, so the test / calibration frequency of additional errors, often used a typical value of about 1V. However, the current probe-based voltmeter is used as a crystal diode detector elements, the voltage range often 2O0V ~ 3V crystal diode detector when the 30mY above voltage range, quasi-peak detector is basically in the state, and in 30mV below quasi-square-law detector is in the state,[link widoczny dla zalogowanych], so in the verification / calibration frequency of additional error, is still around is not the typical use of JV characteristics of the. Should be chosen above and 30mY 30mY at least two ranges for the following test / calibration, so as to reflect more fully the frequency table was seized additional error. This is a little hope in the drop-head type voltage meter Lian set regulations revision, can be considered.
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