GA/T 1711-2020Controlling limits and measurement methods for electromagnetic environment in surveillance center of security systems (English PDF)

1 Scope

This Standard specifies controlling limits and measurement methods for electromagnetic environment in surveillance center of security systems.

This Standard is applicable to electromagnetic environment evaluation for surveillance center of security systems. The electromagnetic environment evaluation in areas such as security inspection and radio frequency reading in the security protection system may refer to this Standard to implement.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB 8702-2014, Controlling limits for electromagnetic environment

GB 50348-2018, Technical code for engineering of security and protection system

HJ 972, Monitoring method for electromagnetic radiation environment

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB

8702-2014, GB 50348-2018 as well as the followings apply.

3.1 surveillance center of security system the central control room that receives and processes security system information, handles alarm events, and manages control system equipment; it is usually divided into guard area and equipment area

5 Measurement method

6 Measurement time and data processing

The measurement shall be performed during the normal working hours of the equipment of surveillance center of security system. Each height of each measuring point is measured 5 times respectively. Each measurement time shall not be less than 15s. Take the steady state value. Record the maximum value of 5 times as the measurement result.

If the measurement result at a certain position exceeds 30% of the environmental limit in Table 1, the physical quantity shall be measured for not less than 24h (the battery replacement time is not included) at the measurement position. It shall be recorded at least every 15s. Respectively count the maximum, minimum, 95% and 50% time probability of not exceeding the field strength values E95 and E50. Draw the distribution diagram of electric field or magnetic field and time as needed. List the maximum, minimum, E95 and E50.

Use E95 as the basis for evaluation.

NOTE: If measure once every 15s and continuously measure for 24h, a total of 5760 measurement data will be generated. When processing, sort all data from largest to smallest. Take the first data as the maximum value. Take the 289th data as E95. Take the

2880th data as E50. Take the 5760th data as the minimum value.

7 Measurement record or report

The measurement record and report for electromagnetic environment of the surveillance center of security system shall include at least the following:

- Environmental conditions such as temperature and relative humidity during

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