Electronic Scale Verification

In our actual work, we often encounter the technical supervision department's periodic verification of electronic scales. Why?

This is because electronic scales are the measurement basis in the trade settlement process. According to the relevant provisions of the “Measurement Law” of the People’s Republic of China, the functional departments of technical supervision determine whether the metrics meet the statutory requirements in order to ensure the fairness of transactions. accurate.

The following is a brief introduction to the verification procedures for electronic scales. Please refer to the actual work:

The following sections are taken from

"Digital Indicating Scale Verification Procedure JJG539--1997"

I. Nouns

1, verification:

To assess the metering performance of the scale, determine if it meets the statutory requirements.

2, the first test:

Verification of scales that have never been verified.

3, subsequent verification:

A cycle verification;

B After the repair;

C. The newly applied compulsory verification of the scale before use;

D Verification of the validity of the periodical verification. This verification is usually based on the requirements of the unit or user being inspected, or the seal or seal expires for some reason;

4, in use test:

Check whether the scale in use meets the requirements of metrological verification procedures, whether it is in good working condition and whether the use is correct and reliable. The commonly used inspection is an oversight inspection.

Second, measurement and technical requirements

1, the accuracy level III

2, the test division value

The test division value is equal to the actual division value, ie e = d

For example, we use a scale of 15 Kg barcode scale e = 5g

3, the number of inspection division N = full scale / scale value

For example, the number of divisions of the 15 Kg barcode scale we use is n = 15000g/5g = 3000

4, the maximum allowable error in the verification:

1) Maximum allowable error of electronic scales after initial verification and overhaul

Maximum allowable error verification quality m
III
±0.5e
0≤m≤500 e
±1.0e
500 e < m≤2000 e
±1.5e
2000 e < m≤10000 e

Take the 15 Kg barcode electronic scale as an example:

Maximum allowable error verification quality m
III
±2.5 g
0≤m≤2.5 Kg
±5.0 g
2.5Kg < m≤ 10 Kg
±7.5 g
10 Kg< m≤ 15Kg

2) The maximum allowable error for in-use inspection is twice the maximum allowable error for the first verification.

Third, the processing and verification of the verification results:

The scales that pass the first and subsequent inspections shall be issued with a certificate of certification, covered by a certificate of conformity, or a certificate of conformity; the dates for the implementation of the first and subsequent verifications and the subsequent validity of the verification shall be indicated; the period or direct impact that may affect the metering performance of the scales shall be indicated. Add seals or seals to the parts where the value of the scale is to be measured, and the original verification certificates and seals or seals of the scales that have passed the inspection in use shall remain unchanged.

The scales that are not qualified in the first verification and subsequent verification are issued a notice of the verification result and are not allowed to be shipped, sold or used;