GB/T 18271.3-2017Process measurement and control devices -- General methods and procedures for evaluating performance -- Part 3: Tests for the effects of influence quantities (English PDF)

Foreword

GB/T 18271 "Process measurement and control devices - General methods

and procedures for evaluating performance" is currently planned to be issued

as follows.

- Part 1.General considerations;

- Part 2.Tests under reference conditions;

- Part 3.Tests for the effects of influence quantities;

- Part 4.Evaluation report content.

This Part is Part 3 of GB/T 18271.

This Part is drafted in accordance with the rules given in GB/T 1.1-2009.

This Part replaces GB/T 18271.3-2000 "Process measurement and control

devices - General methods and procedures for evaluating performance - Part

3 Tests for the effects of influence quantities". Compared with GB/T 18271.3-

2000, the main technical changes of this Part are as follows.

- UPDATE normative references (see Clause 2; Clause 2 of the 2000 edition);

- Delete the term "device under test" and definition (see 3.1 of the 2000

edition);

- ADD the term "type test" and definition (see 3.8);

- ADD the requirement that "A test is only to be performed if it is applicable

to the Device Under Test (DUT). If the specification of the DUT states limits

for the influence considered, these limits shall be noted and respected" (see

4.1);

- ADD general requirements for electromagnetic compatibility test (see 4.3);

- Modify the temperature range, temperature class, and typical service

application in Table 1 "Ambient temperature test ranges" and add a note

(see Table 1; Table 1 of the 2000 edition);

- Modify the typical application and the parameter of vibration levels in Table

2 "Vibration test levels" (see Table 2; Table 2 of the 2000 edition);

- Modify the test voltage and frequency values in "Supply voltage and

frequency variations" (see 12.1; 12.1 of the 2000 edition);

- In "Short-term supply voltage interruptions", delete the requirements that

"The a.c. power supply unit shall be interrupted for 1, 5, 10, and 25 cycle

durations at the crossover point" and "In addition, random interruptions can

also be used for at least 10 times each duration"; CHANGE to the provision

that the tests shall be according to the requirements of 4.3; and, add the

test parameters of power supply commutations-interruptions (see 4.3; 12.4

of the 2000 edition);

- Modify "Fast transient/burst immunity" test requirements; ADD the provision

that the tests shall be according to the requirements of 4.3; CHANGE

"severity level specified by the manufacturer" to "severity level according to

Table 2 of GB/T 18268.1-2010"; and, add Table 5 "Burst characteristics"

(see 12.5; 12.5 of the 2000 edition);

- Modify "Surge immunity" test requirements; ADD the provision that the tests

shall be according to the requirements of 4.3; CHANGE "severity level

specified by the manufacturer" to "severity level according to Table 2 of

GB/T 18268.1-2010"; amend "Input level shall be maintained at a value that

produces 50 % of the output signal" to "The device input shall be held

constant at 50 %"; and, add Table 6 "Surge characteristics" (see 12.6; 12.6

of the 2000 edition);

- ADD the provision that the tests shall be according to the requirements of

14 of the 2000 edition);

- ADD the provision that "Magnetic field effects" test shall meet the

requirements of 4.3; CHANGE the test magnetic field strength from a

uniform 400 A/m (r.m.s) to "according to the relevant standards for the

environment in which it is located" (see Clause 15);

- Modify the title of Clause 16 from "Radiated electromagnetic interference"

to "Electromagnetic field immunity test"; ADD a provision that the test field

strength for the enclosure device is 10 V/m (see Clause 16; Clause 16 of

the 2000 edition);

- ADD the provision that the tests shall be according to the requirements of

78 and add it to Clause 2.

This Part was proposed by China Machinery Industry Federation.

This Part shall be under the jurisdiction of National TC 124 on Industrial Process

Measurement, Control and Automation of SAC (SAC/TC 124).

Drafting organizations of this Part. Shanghai Institute of Process Automation &

Instrumentation, Chongqing Institute of Industrial Automation and

Instrumentation, Southwest University, Shanghai Automation Instrumentation

Co., Ltd.

Main drafters of this Part. Wang Jianing, Liu Qin, Zhou Xuelian, Ni Min.

The previous editions of the standard replaced by this Part were released as

follows.

- GB/T 18271.3-2000.

Process measurement and control devices - General

methods and procedures for evaluating performance -

Part 3.Tests for the effects of influence quantities

1 Scope

GB/T 18271 specifies general methods and procedures for conducting tests

and reporting on the functional and performance characteristics of process

measurement and control devices. The tests are applicable to any such devices

characterized by their own specific input and output variables, and by the

specific relationship (transfer function) between the inputs and outputs, and

include analogue and digital devices. For devices that require special tests,

GB/T 18271 should be used, together with any product-specific standard

specifying special tests.

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are

applicable to this document. For the undated references, the latest edition

(including all the amendments) are applicable to this document.

GB/T 2900.56-2008 Electrotechnical terminology - Control technology (IEC

60050-351.2006, IDT)

3 Terms and definitions

The terms and definitions defined in GB/T 2900.56-2008, GB/T 2900.77-2008,

and IEC 60050 (300) and the following ones apply to this document.

Algebraic difference between the values of the upper and lower limits of the

measuring range.

4 General considerations

However, consideration should be given to any combination of two or more

influence quantities which may aggravate the operating conditions (e.g. for an

electrical device, temperature and supply voltage).

5 Ambient temperature effects

Any effects on a digital display indicator shall also be reported, including loss

of contrast, brightness, distortion or missing bits.

6 Ambient relative humidity effects

The effects of ambient relative humidity shall be determined by placing the DUT

in a humidity test chamber in which the value of relative humidity should be

controlled within +2 % to -3 % of the specified relative humidity levels (as

specified in IEC 60068-2-78).

7 Vibration

The initial resonance search shall be carried out to study behaviour of the DUT

to determine any component resonances and the corresponding resonance

frequencies, and to obtain information for comparison with the final resonance

search.

The satisfactory mechanical condition of the DUT shall be verified at the end of

the tests with a visual examination for any deformation or cracks in the

components or mountings.

8 Shock, drop and topple

The test shall be made according to the test procedure Ec of IEC 60068-2-31

and according to the free fall method reported in GB/T 17214.3-2000.

Before the test, reference measurements of lower range-value and span shall

be recorded.

9 Mounting position

Where the DUT might be position sensitive, the change in lower range-value

and span caused by 10° inclinations from the position(s) specified by the

manufacturer shall be measured and recorded in percent of output span.

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