GB/T 8170-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 8170-2008 | English | 75 |
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Rules of rounding off for numerical values and expression and judgement of limiting values
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| GB/T 8170-1987 | English | 199 |
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Rules for rounding off of numerical values
| Obsolete |
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GB/T 8170-2008: Rules of rounding off for numerical values and expression and judgement of limiting values
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8170-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.120.30
A 41
Replacing GB/T 1250-1989, GB/T 8170-1987
Rules of rounding off for numerical values & expression and
judgement of limiting values
Issued on. JULY 16, 2008
Implemented on. JANUARY 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Terms and definitions... 5
3 Rules of rounding off for numerical values... 6
4 Expression and judgment of limiting value... 9
Bibliography... 15
1 Scope
This Standard specifies the rules for rounding off values, the expression and
determination of numerical limits, relevant terms and their symbols, and the method for
comparing measured values or their calculated values with the limiting values specified
in the standard.
This Standard applies to various values obtained through testing and calculation in
scientific, technological and production activities. When the obtained values need to be
rounded off, they should be rounded off according to the rules given in this standard.
This Standard is applicable to the preparation of various standards or other technical
specifications and the determination of test results.
2 Terms and definitions
For the purposes of this Standard, the following terms and definitions apply.
2.1 rounding off for numerical values
The process of omitting the last several digits of the original numerical value and then
adjusting the last reserved digit to make the final obtained value approximately equal
to the original numerical value.
2.2 rounding interval
The minimum numerical value unit of the rounding value.
2.3 limiting values
The boundary values of the index values which are presented in number, in compliance
with the standard (or other technical specifications) and has to be assessed as required
by the standard (or other technical specifications).
3 Rules of rounding off for numerical values
3.1 Determination of rounding interval
3.2 Rules of rounding off
3.2.1 The numerical value is rounded down if the leftmost one of the numbers intended
to be discarded is less than 5; and the reserved numbers keep unchanged.
Example. Round 12.1498 to the single digit, 12 is obtained. Round 12.1498 to one
decimal place, then 12.1 is obtained.
3.2.5 When rounding off the negative number, first round its absolute value according
to those specified in 3.2.1~3.2.4 and then add the negative sign at the front of the
obtained value.
3.3 Continuous rounding off is not permissible
3.3.1 The rounding number shall be obtained by rounding the numerical value only
once after the rounding interval or rounding digits are specified. More than one time of
continuous rounding off in accordance with 3.2 is not permissible.
(expressed as -0.036 in specified occasions)
4 Expression and judgment of limiting value
4.1 General principles for written limiting values
4.1.1 The limiting value shall be provided for the index or parameter which is presented
in numbers and has to be assessed as required in the standard (or other technical
specifications).
4.2 Terms expressing the limiting values
4.2.1 Basic terms
4.2.1.1 The basic terms and symbols expressing the limiting values is detailed in Table
1.
4.2.1.2 The basic terms may be used by combination to indicate the scope of limiting
value.
4.2.2 Values with limit deviations
4.2.2.1 Basic value A with upper deviation +b1 of absolute limit and lower deviation -
b2 of absolute limit refers to the values fromA-b2 to A+b1 meet the requirements and it
is expressed as.
4.3 Comparison method of the measured value or its calculated value and the
limiting value specified in the standard
4.3.1 General provisions
4.3.1.1 When judging whether the measured value or its calculated value meet the
standard requirements of not, the measured value of test or its calculated value shall be
compared with the limiting value specified in the standard, and any of the following
methods may be adopted for comparison;
4.3.1.3 If one of comparative methods is specified in the standard or relevant document,
it shall not be changed once been determined.
4.3.2 Complete numerical comparison method
Do not round off the measured value or calculated value (or even though the value has
been rounded off, it shall be indicated that it has been rounded down, up or neither of
them) and then compare this value with specified limiting value;
4.3.3 Rounded-off-value comparison method
4.3.3.1 Round off the measured value or its calculated value, and the rounding off digit
shall be consistent with the digit of the specified limiting value.
4.3.3.2 Compare the rounded off values and the specified limiting value, if this value
exceeds the specified range of limiting value (no matter large or not), it will be judged
as do not meet the requirements. See Table 3 for examples.
Table 3 (continued)
4.3.4 Comparison of two kinds of judgment methods
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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