GB/T 34973-2017 English PDF (GB/T34973-2017)

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GB/T 34973-2017: On-site measurements of obstrusive light of LED panels
GB/T 34973-2017
On-site measurements of obstrusive light of LED panels
ICS 31.120
L63
National Standards of People's Republic of China
On-site measurement method of interference light of LED display screen
2017-11-01 released
2018-05-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by the National Standardization Administration of China
On-site measurement method of interference light of LED display screen
1 Scope
This standard specifies the on-site measurement method of the interference light of the LED display.
This standard applies to LED displays, and other display devices can be implemented as a reference.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 2900.65 Electrical engineering terminology lighting
JGJ/T 163 Code for Design of Urban Nightscape Lighting
SJ/T 11141 General Specification for LED Display
SJ/T 11281 Light-emitting diode (LED) display test method
CIE150-2003 Guidelines for the Control of Interference Light in Outdoor Lighting Devices (Guideon the Limitation of the Effects of Obtrusive
lightfromoutdoorlightinginstalations)
3 Terms and definitions
The terms and definitions defined in GB/T 2900.65, SJ/T 11141, SJ/T 11281 and JGJ/T 163 apply to this document.
4 General requirements
4.1 Test conditions
Should choose to measure when the air visibility is high, to avoid the interference of environmental factors on the measurement.
4.2 Measuring equipment
The uncertainty of the measuring equipment should meet the technical requirements of the relevant specifications and be qualified. During the verification period, proceed according to the relevant operating procedures
Line measurement.
5 Measurement method
5.1 General
The measurement location should be carried out at a location affected by the interference light, such as the window of the disturbed residential building, on the motor vehicle lane, etc.
5.2 Maximum illuminance
5.2.1 Measurement conditions
The measurement conditions should meet the following requirements.
a) The viewing angle range of the light probe should not be less than the display area of the LED display, but the introduction of other light sources should be avoided;
b) The measurement direction is the connection between the location affected by the interference light and the center of the LED display, without buildings or other obstructions in the middle.
5.2.2 Measuring device
The illuminance meter probe should be equipped with a suitable black sleeve. The sleeve should make the probe's viewing angle as small as possible, but it should be ensured that the light probe's collection range is not less than
The display area of the LED display.
5.2.3 Measurement procedure
Use an illuminance meter to measure the illuminance E of the LED display during normal playback, and perform continuous measurement within no less than 5 minutes, whichever is the largest
The value is recorded as Emax as the maximum illuminance in the evaluation of interference light. The value of the illuminance measurement specified in this clause is used to quickly determine the LED display
Whether the screen illuminance exceeds the limit requirement.
5.3 Maximum brightness
5.3.1 Measurement conditions
The measurement conditions should meet the following requirements.
a) The collection range of the light probe shall not be less than 16 adjacent pixels;
b) The measuring direction is the connection between the place where the interference light occurs and the display area of the LED display.
5.3.2 Measurement procedure
When the LED display screen is playing normally, select the measurement display area arbitrarily, use the luminance meter for continuous measurement, and collect no less than 50 luminance
Data, the maximum value of which is recorded as Lmax as the maximum brightness during the evaluation of interference light. For the brightness measurement specified in this clause, the value is used for
Quickly determine whether the brightness of the LED display exceeds the limit.
5.4 Threshold increment calculation
The threshold increment calculation should meet the relevant requirements of CIE150-2003 in 5.4, and Emax is taken as the corresponding illuminance value in the calculation.
6 Reports and records
When applicable, measurement reports and records should include the following.
a) Basic information of the LED display, including installation location and purpose;
b) The time and date of the measurement;
c) Weather conditions at the time of measurement;
d) Measuring instrument and equipment model, calibration validity period, etc.;
e) The location and measurement data of the measuring point.