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link 11.11.2014 5:51 |
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Subject: over 10% input bel.usg. Из инструкции к мультиметру:"Accuracy is guaranteed for over 10% input of the range in current and voltage" Я правильно понимаю, что точность гарантируется для диапазона тока и напряжения, превышающего 10% указанных входных параметров? То есть меньше 10% номинала измерять точно не может, так? |
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link 11.11.2014 6:11 |
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А вот еще второй вопрос: Accuracy ±(%rdg. +dgt.) Сомневаюсь, переводить ли в скобках, особенно +dgt, может, кто знает вариант перевода правильный? Вот нагуглил описание: "The accuracy of a digital tester is defined as the difference between the reading and the true value for a quantity measured in reference conditions. Accuracy is specified in the format: (±xx% rdg ±xx dgt) The first portion identifies a percentage error relative to the reading, which means it is proportional to the input. The second portion is an error, in digits, that is constant regardless of the input. |
| погрешность (±xx% отсчета/измеряемой величины ±xx ед. младшего разряда) |
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2.1. Multimeter Accuracy The accuracy of a measurement is often expressed as a tolerance. A tolerance can be expressed as a percent or in original units. For example, a ± 2% tolerance on 50 Volts could also be expressed as ± 1 Volt. The accuracy of a Digital MultiMeter (DMM) is listed on the bottom of the meter. It is given as a reading percent + number of least significant digits, such as ± (1% + 1 Digit). To use this accuracy description, do the following: (1) Multiply the reading displayed on the meter by the percent accuracy. (2) Round the result to the same number of significant digits as the reading originally had. (3) Take the result of Step 2 and add the Digit value in the least significant column. A meter that reads 0.505 and has a tolerance of ± (3% + 2 Digits) actually has a tolerance of: (1) 0.505 * 0.03 = 0.01515 (2) 0.015 (after rounding) (3) ± (0.015 + .002) = ± 0.017 (3.4% of 0.505) Therefore, the actual value is between .488 and .522. Whatever the meter displays is a place of accuracy, even if the number displayed is zero (e.g. a reading of 2.600 still has 4 places of accuracy, and a Digit value will be added in the thousandths column). It is always good lab practice to use the most accurate meter scale when making a measurement. Measuring a 10 Volt signal on the 20 Volt scale will be more accurate than measuring it on the 200 Volt scale. |
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