GB/T 26497-2022Electronic balances (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document replaces GB/T 26497-2011 "Electronic Balance". Compared with GB/T 26497-2011, except for structural adjustments and editorial changes In addition to the dynamics, the main technical changes are as follows.

a) Changed the description and non-applicable scope of the electronic balance, and clarified the applicable electronic balance --- "balanced by electromagnetic force, resistance strain Type load cell is the core component", add "trade settlement balance" to the non-applicable scope (see Chapter 1);

b) Changed the normative reference documents, added GB 4793.1, JJF1843 and JJG99, deleted GB/T 2829, GB/T 12113 and JJG1036 (see Chapter 2);

c) Changed the terms and definitions, adding "display division value", "verification division value", "verification division number", "sensitivity", "discrimination power", "repeat Change "tare device" to "tare device" (see 3.4~3.6, 3.12~3.18, 3.11);

d) The unit of measurement has been changed, "microgram" has been deleted, and "kilogram" has been changed to "kilogram" (see Chapter 4);

e) The constraint relationship between the verification scale value and the display scale value has been added (see 5.1.2 Table 1, 5.1.3, 5.1.4);

f) Changed the "minimum weighing Min" formula, changing "100d", "50d", and "20d" to "100e", "50e", "20e" and so on (see Table 3 in 5.2.2);

g) Delete the "temperature fluctuation" limit in normal working conditions (see 5.4.4 Table 3 of the 2011 edition);

h) Changed the relative humidity range, deleted the "lower humidity limit", and relaxed part of the "humidity upper limit" (see 5.5.3 Table 4 of the 2011 edition);

i) The appearance and structure requirements are changed, and the requirements for "adaptability" and "safety" are added (see 6.1.1~6.1.3);

j) The measurement performance "zero error" and "tare weighing" requirements have been added (see 6.2.5, 6.2.6);

k) Change requirements caused by influence quantity and time, including slope, temperature, voltage and time, etc. (see 6.3, 6.3.1~6.3.4);

l) Changed the functional requirements, added the common interface type of the balance and "the balance has no weighing indication during the warm-up time", etc. (see 6.4.2, 6.4.3);

m) Changed the requirements for the indication of weighing results, added the "digital indication" part and "indication change", "balance stability" and "storage", etc. (see 6.5.3~6.5.5, 6.5.7);

n) Changed the requirements for the tare device, adding "balanced stability" and "same key control" (see 6.7.4, 6.7.5);

o) The requirements for anti-interference requirements have been changed, and the "and" relationship has been changed to an "or" relationship (see 6.9.1, 6.9.2);

p) Changed the requirements for damp heat and steady state (see 6.10);

q) Changed the requirements for range stability and increased frequency and cycle requirements (see 6.11.1);

r) Added requirements for durability and additional requirements for software (see 6.12, 6.13);

s) Changed the requirements for standard weights (see 7.2.1);

t) Changed the measurement performance test requirements, added "zero test" and "tare weighing test", refined and improved the "weighing test" and "repeatability test". Test" and "eccentric load test" (see 7.5.1~7.5.5);

u) Changed the test requirements of the influence factor, refined and perfected the tilt test, temperature change test, voltage change test and time-induced Change test, etc. (see 7.6.1~7.6.4);

v) Added warm-up time test, balance stability test, anti-interference test, durability test and inspection of additional software requirements, adjustment Adjust "Appendix A Anti-interference test method" to the text (see 7.8, 7.9.3, 7.13, 7.16, 7.17);

w) Changed the test requirements for zero-setting device and zero-point tracking device, adding "semi-automatic zero-setting" and "automatic zero-setting" tests (see 7.10);

x) Change the safety requirement test, delete the "double insulation" test in the dielectric strength test (see 7.12.1, 7.10.1.2 of the 2011 edition);

y) Change the requirements of the inspection rules, delete the periodic inspection requirements, and refine the "inspection items and corresponding requirements, test methods" (see Chapter 8 and Table 12);

z) Changed labeling, marking and packaging requirements, refined and improved product labels (nameplates), packaging marks and packaging requirements, etc. (see 9.1, 9.2, 10.1).

1 Scope

This document specifies the terms and definitions, units of measurement, basic parameters, requirements, test methods, inspection rules, labels, marks, Packaging, transportation and storage.

This document is applicable to the core components of weighing sensors such as electromagnetic force balance type, resistance strain type, inductive type, and capacitive type. Design and manufacture of electronic balances (hereinafter referred to as balances) not less than 1 mg.

This document does not apply to vacuum balances, thermal balances, remote control balances, automatic balances, nor to trade settlement balances and manufactured by agreement scales.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 191 Packaging, storage and transportation icon marks

GB 4793.1-2007 Safety requirements for electrical equipment for measurement, control and laboratory use Part 1: General requirements

GB/T 9969 General Rules for Instructions for Use of Industrial Products

GB/T 11606-2007 Environmental test methods for analytical instruments

GB/T 17626.2 Electromagnetic Compatibility Test and Measurement Technology Electrostatic Discharge Immunity Test

GB/T 17626.3 Electromagnetic Compatibility Test and Measurement Technology Radio Frequency Electromagnetic Field Radiation Immunity Test

GB/T 17626.4 Electromagnetic Compatibility Test and Measurement Technology Electrical Fast Transient Burst Immunity Test

GB/T 17626.6 Electromagnetic compatibility test and measurement technology Conducted disturbance immunity induced by radio frequency field

GB/T 17626.11 Electromagnetic compatibility test and measurement technology Immunity test for voltage dips, short interruptions and voltage changes

JJG 99 Weights

JJF 1834-2020 General technical requirements for non-automatic weighing instruments

3 Terms and Definitions

The following terms and definitions apply to this document.