This standard specifies the environmental test methods and severity levels for fire protection electronic products. This standard applies to environmental testing of fire protection electronic products used in general installation locations (including outdoor). Environmental test methods and severity levels for fire protection electronic products installed in special locations should also refer to this standard, except for special requirements that should be separately specified by relevant standards. GB 16838-1997 Environmental test methods and severity levels for fire protection electronic products GB16838-1997 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Fire Electronic Products
Environmental Test Methods and Severities for Fire Electronic Products1 Subject Content and Scope of Application
This standard specifies the environmental test methods and severities for fire electronic products. GB16838--1997
This standard is applicable to environmental tests of fire electronic products (such as various fire parameter detection, alarm, linkage control equipment and its auxiliary equipment, etc., the same below) used in general installation places (including outdoor). The environmental test methods and severities of fire electronic products installed in special places should also refer to this standard, except for special requirements that should be separately specified by relevant standards. 2 Reference standards
GB2421--89 General rules for basic environmental testing procedures for electric and electronic products GB/T2422-1995 Terminology for environmental testing of electric and electronic products GB2423.1-89 Basic environmental testing procedures for electric and electronic products Test A: Low temperature test method GB2423.2--89 Basic environmental testing procedures for electric and electronic products Test B: High temperature test method GB/T2423.3--93 Basic environmental testing procedures for electric and electronic products Test Ca: Steady state damp heat test method GB/T2423.4-93 Basic environmental testing procedures for electric and electronic products Test Db: Alternating source heat test method GB/T2423.5--1 995 Basic environmental test procedures for electric and electronic products Part 2: Test methods Test Ea and guidance: Shock
GB/T2423.10--1995 Basic environmental test procedures for electric and electronic products Part 2: Test methods Test Fc and guidance: Vibration (sinusoidal)
GB2423.19-81 Basic environmental test procedures for electric and electronic products Test Kc: Sulfur oxide test method for contact points and connectors
GB/T6113-1995 Specification for radio interference and immunity measuring equipment 3 General
The purpose of formulating this standard is to provide a unified and reproducible environmental test method for the inspection of fire-fighting electronic products. The standards for fire-fighting electronic products make specific provisions on the use of various test methods (conditions) and product levels based on the environmental conditions that the products may encounter and after comprehensive analysis from technical and economic aspects. 3.1 Test classification
The tests listed in this standard are divided into two categories.
Category 1: Operation test
This type of test is mainly to determine whether the product meets the functional requirements under environmental test conditions. The purpose is to test the ability of the product to work normally in the use environment and verify the product's anti-interference ability in this environment. During its test, the product is in normal monitoring status. National Technical Supervision Fan 1997-06-03 approved 474
1998-05-01 implementation
Category I: Endurance test
GB 16838-1997bzxz.net
This type of test is to accelerate the impact of normal use environment conditions on the product, further determine the performance of the product, and examine the residual impact (non-instantaneous impact) of the test environment on the product in the non-working state. The purpose is to verify the product's ability to withstand the use environment for a long time. 3.2 Test items
The test items specified in this standard are shown in Table 1:
Table 1 Test items
Operation test (Class I)
Item number
Test items
High temperature test
Low temperature test
Steady damp heat test
Alternating damp heat test
Impact test
Collision test
Vibration (sinusoidal) test
Voltage fluctuation test
Main voltage dip and interruption test
Electrostatic discharge test
Radiated electromagnetic field test||tt| |Electrical transient pulse test
Voltage transient (electrical surge) test
Rain test
3.3 Classification of test severity levels
Item number
Durability test ([category)
Test items
High temperature test
Low temperature test
Constant damp heat test
Alternating damp heat test
Sulfur dioxide corrosion test
Vibration (sinusoidal) test
For each environmental test, the appropriate test method and severity level should be selected according to different types of products and different installation and use sites. This standard divides products into four levels: 0, I, II, and III according to product type and installation and use site. Level 0: Products installed in civil houses or similar residential houses; Level 1: Alarm control, linkage, indication equipment, power supply equipment, etc. installed in commercial or industrial houses; Level II: Various fire parameter detectors installed in commercial or industrial houses; Level III: Products installed outdoors.
4 Test methods and severity levels
4.1 High temperature (operation) test
4.1.1 Purpose
To test the ability of the product to work normally in a high temperature environment. 4.1.2 Test methods
The test method is carried out in accordance with the test B: High temperature test method in GB2423.2-89. This test adopts a temperature gradient method. Test Bd should be used for heat dissipation test samples, and test Bb should be used for non-heat dissipation test samples. During the conditional test, the test sample should be powered on and in normal monitoring status. Functional testing is usually carried out in the last half 175
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hour of the conditional test, and again after the recovery period. For certain types of products (such as temperature and smoke detectors), their functional testing is allowed to be carried out in specific standard testing equipment. 4.1.3 Severity level (see Table 2)
Temperature, C
Duration, h
1) For fire detectors, the test temperature should be 50°C, 16°C, and 2h.
2) The duration of 2h is suitable for small test samples such as detectors, while the duration of 16h is suitable for large test samples such as alarm controllers.
4.1.4 Test equipment
The test equipment should comply with the provisions of Chapter 4 of GB2423.2-89. 4.2 High temperature (durability) test
4.2.1 Purpose
To test the ability of the product to withstand long-term aging. 4.2.2 Test method
The test method is carried out in accordance with Test B: High temperature test method in GB2423.2-89. This test uses non-heat dissipation test samples (i.e. Test Bb). If the temperature mutation does not damage the test sample, Test Ba can also be used. During the conditional test, the test sample is in a non-powered state. Functional testing is carried out after the conditional test recovery period. Although the test sample is not powered on during the conditional test, this test requires that a short-term memory storage backup battery should be provided for the sample so that the contents of the storage are not lost during the conditional test. 4.2.3 Severity level (see Table 3)
Temperature, C
Duration, d
4.2.4 Test equipment
No test
The test equipment should comply with the provisions of Chapter 4 of GB2423.2-89. 4.3 Low temperature (operation) test
4.3.1 Purpose
To test the ability of the product to work normally in a low temperature environment. 4.3.2 Test method
The test method shall be carried out in accordance with Test A: Low temperature test method in GB2423.1~89. 70
This test adopts the temperature gradient method. Test Ad should be used for heat dissipation test samples, and test Ab should be used for non-heat dissipation test samples. During the conditional test, the test sample should be powered on and in normal monitoring state. Functional testing is usually carried out in the last half hour of the conditional test and again after the recovery period. 4.3.3 Severity level (see Table 4)
Temperature, C
Duration, h
GB168381997
0 and!
1) The duration of 2h is suitable for test samples with smaller volume such as operators and testers, and the duration of 16h is suitable for test samples with larger volume such as alarm controllers.
4.3.4 Test equipment
The test equipment should comply with the provisions of Chapter 5 of GB2423.1-89. 4.4 Low temperature (durability) test
4.4.1 Purpose
To test the ability of the product to withstand long-term low temperature. 4.4.2 Test method
The test method shall be in accordance with GB2423.1-89 Test A: Low temperature test method. This test uses non-heat dissipation test samples (i.e., test Ab). If the temperature mutation does not damage the test sample, test Aa can also be used. During the conditional test, the test sample is in a non-powered state. Functional testing is carried out after the conditional test recovery period ends. 4.4.3 Severity level (see Table 5)
Temperature,
Duration, h
4.4.4 Test equipment
The test equipment should comply with the provisions of Chapter 5 of the national standard GB2423.1-89. 4.5 Steady damp heat (operation) test
4.5.1 Purpose
To test the ability of the product to work normally in an environment with high relative humidity (no condensation). 4.5.2 Test method
The test method is carried out in accordance with the test Ca: Steady damp heat test method in B/T2423.3--93. 0 and I
During the conditional test, the test sample should be powered on and in normal monitoring state. Functional testing is usually carried out in the last half hour of the conditional test and again after the recovery period. 4.5.3 Severity level (see Table 6)
Overflow,
Relative humidity,%
Special duration,
0 and!
Not tested\
1) Usually, the alternating damp heat (operation) test should be adopted. If it is not suitable, the test conditions of level! can be adopted. 2) The alternating condensation heat (operation) test should be adopted. 4.5.4 Test equipment
Not tested 3)
GB16838---1997
The test equipment should comply with the provisions of Chapter 2 of GB/T2423.3-93. 4.6 Steady-state humidity and heat (durability) test
4.6.1 Purpose
To test the ability of the product to withstand the influence of humidity in the actual use environment for a long time (such as changes in electrical properties caused by absorption, electrochemical corrosion, etc.).
4.6.2 Test method
The test method is carried out in accordance with the test Ca: steady humidity and heat test method in GB/T2423.3-93. During the conditional test, the test sample is in a non-powered state. Functional testing should be carried out immediately after the recovery period. 4.6.3 Severity level (see Table 7)
Temperature, ℃
Relative humidity, %
Duration, d
4.6.4 Test equipment
The test equipment should comply with the provisions of Chapter 2 of GB/T2423.3--93. 4.7 Cyclic damp heat (operation) test
4.7.1 Purpose
To test the anti-interference ability of the product in an environment with high relative humidity (with condensation). 4.7.2 Test method
O, 1, I and E
The test method shall be carried out in accordance with the test Db: Cyclic damp heat test method in GB/T2423.4-93, and the variable cycle and controlled recovery conditions shall be in accordance with Article 5.2 of GB/T2423.4--94. During the conditional test, the test sample shall be powered on and in normal monitoring state. Functional testing shall be carried out immediately after the end of the conditional test and again after the recovery period. If necessary, functional testing can also be carried out in the last half hour of the high temperature section of the last cycle.
4.7.3 Severity level (see Table 8)
Temperature, ℃
Cycle
1) Constant damp heat (operation) test should be used, 0 and I
Not tested1)
2) If the alternating damp heat (operation) test is not appropriate, the constant damp heat (operation) test can be used4.7.4 Test equipment
The test equipment should comply with the provisions of Chapter 3 of GB/T2423.4-93. 4.8 Alternating damp heat (durability) test
4.8.1 Purpose
To test the ability of the product to withstand high humidity and condensation for a long time. 4.8.2 Test method
The test method is carried out in accordance with the test Db: alternating damp heat test method in GB/T2423.4--93, and the variable cycle and controlled recovery conditions are specified in Article 5.2 of GB/T2423.4-93. 478
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During the conditional test, the test sample is in a non-powered state. Functional testing should be carried out immediately after the recovery period. 4.8.3 Severity level (see Table 9)
Filtration, ℃
Cycle
1) A constant damp heat (durability) test should be used. 0, and 1
No test\
2) In addition to this test, the first-level product should also be subjected to a constant damp heat (durability) test. 4.8.4 Test equipment
The test equipment should comply with the provisions of Chapter 3 of GB/T2423.4-93. 4.9 Sulfur dioxide (SO,) corrosion (durability) test 4.9.1 Purpose
To test the ability of the product to withstand the corrosion of sulfur dioxide gas, one of the atmospheric pollutants. 4.9.2 Test method
Except for increasing the severity of relative humidity, the test method is carried out in accordance with the sulfur dioxide test method for contact points and connectors in GB2423.19-81.
The test conditions should keep the surface temperature of the test sample above the dew point. During the conditional test, the sample is in a non-powered state. After the test, the test sample is immediately placed at a temperature of (40 ± 2) ° C and a relative humidity of less than 50% for drying for 16 hours, and then restored under normal atmospheric conditions for 1~2 hours. After the recovery period, the functional test is carried out. 4.9.3 Severity level (see Table 10)
Sulfur dioxide content (10-)
Temperature,
Relative humidity,%
Duration, d
4.9.4 Test equipment
No test
The test equipment shall comply with the provisions of Chapter 3 of GB2423.19-81 4.10 Impact (operation) test
410.1 Purpose
To test the ability of the product to withstand mechanical impact that may occur in the actual use environment. 4.10.2 Test method
The test method shall be carried out in accordance with Test Ea: Impact test method in GB/T2423.5-1995. I and"
The impact pulse waveform selected in this test is a half-sine wave. During the conditional test, the test sample should be powered on and in normal monitoring state. Functional testing is carried out after the conditional test. 4.10.3 Severity level (see Table 11)
Pulse duration, ms
Acceleration, g, related to sample mass m
m≤4.75 kg
m>4.75 kg
Number of impact directions
Number of impacts in each direction
4.10.4 Test equipment and measurement system
GB16838--1997
The test equipment shall comply with the relevant provisions of Chapter 3 of GB/T2423.5-1995. 4.11 Collision (operation) test
4.11.1 Purpose
0, 1 and
100-20 m
No test
Inspect the product's ability to withstand mechanical impact on the product surface that may occur in a normal use environment. 4.11.2 Test method
This standard specifies two different test methods. Method A is to use only a swinging hammer to perform a collision test on the test sample, which produces a momentary impact on the edge of the test sample. This collision test is particularly suitable for smaller test samples installed on the ceiling (such as point-type smoke and point-type heat fire detectors).
Mount the test sample on the rigid horizontal mounting plate of the test equipment in its normal working position (see Figure 1), and put the sample in a normal monitoring state. The test sample should be energized for at least 15 minutes before the test. Adjust the collision test equipment so that the center of the hammer collision surface can hit the test sample in the horizontal direction, and align it with the part that makes the test sample most vulnerable to damage. Perform collision. Functional testing should be carried out after the conditional test. Method B is to use a hemispherical hammer to perform collision tests on the exposed surfaces of the test sample. This test is suitable for larger products that are installed in the workplace (such as fire alarm control consoles). According to the requirements of the normal monitoring state, the sample is connected to the equivalent load, and the power is turned on to put the sample in the normal monitoring state. Apply three collisions to each vulnerable part on the surface of the test sample (such as indicator lights, displays, etc.). The test should be carried out carefully to ensure that the results of the previous group (three times) of collisions do not affect the results of subsequent groups of collisions. When it is considered that there may be an impact, the defects found should be ignored, and a new test sample should be taken and retested at the same location. Functional testing should be carried out after the conditional test. 4.11.3 Severity level
Test method A (see Table 12)
Collision energy,
Hammer speed.m.5
Number of magnetic collisions in each direction
Test method 3 (see Table 13)
Energy removal
Number of magnetic collisions at each point
4.11.4 Test equipment
0.11 and
1.5±0.125
O, I and
0.5±0.04
a) The equipment used in test method A is as follows. G16838-1997
The main body of the test equipment (see Figure 1) is a pendulum mechanism. The hammer head of the pendulum is made of hard aluminum alloy AICu.SiMg (solid solution and aging treatment), and its shape is a hexahedron with an inclined collision surface. The pendulum rod of the hammer head is fixed on a steel hub with a ball bearing, and the ball bearing is installed on a fixed steel shaft of a hard steel frame. The structure of the hard steel frame should ensure that the pendulum can rotate freely when the specimen is not installed. The overall dimensions of the hammer head are 94mm long, 76mm wide and 50mm high. The angle between the chamfer of the hammer head and the longitudinal axis of the hammer head is 60°±1°. The outer diameter of the pendulum rod of the hammer head is (25±0.1)mm and the wall thickness is (1.6±0.1)mm. The radial distance between the longitudinal axis of the hammer head and the axis of rotation is 305mm, and the axis of the pendulum rod of the hammer head must be perpendicular to the axis of rotation. The steel wheel hub with an outer diameter of 102mm and a length of 200mm is concentrically assembled on a steel shaft with a diameter of 25mm. The accuracy of the diameter of the steel shaft depends on the tolerance of the bearing size used.
Two steel counterweight arms with an outer diameter of 20mm and a length of 185mm are installed in the direction opposite to the steel wheel hub and the pendulum rod, and the extension length is 150mm. An adjustable counterweight block is installed on the two counterweight arms to balance the hammer head and the counterweight arm. An aluminum alloy pulley with a thickness of 12 mm and a diameter of 150 mm is installed on the end of the steel wheel hub. A cable is wound around the pulley. One end of the cable is fixed on the pulley, and the other end is tied to a working weight.
The horizontal mounting plate for mounting the specimen is supported by a steel frame. The mounting plate can be adjusted up and down so that the center of the collision surface of the hammer head hits the specimen from the horizontal direction, as shown in Figure 1. When using the test equipment, first adjust the position of the specimen and the mounting plate according to Figure 1. After adjustment, fasten the mounting plate to the steel frame, then remove the working weight, and balance the pendulum mechanism by adjusting the counterweight. After adjusting the balance, pull the pendulum to a horizontal position and tie the working weight. When the pendulum mechanism is released, the working weight will cause the hammer head to rotate 0.388 kg
rad to hit the specimen. The mass of the working weight is: where: r is the effective radius of the pulley, m. When r is 75 mm, the mass of the working weight is about 0.55 kg and the mass of the hammer head is about 0.79 kg. 76
a mounting plate; b detector c hammer; d-swing rod steel wheel hub; f-ball bearing; g rotate 270°; h-working hammer; j-counterweight block; k counterweight arm, --- pulley Figure 1 collision test equipment Figure
b) The equipment used in test method B is as follows. The collision test instrument operated by the spring is shown in Figure 2. The instrument consists of three main parts: the main body, the collision member and the cone for loading and releasing the spring.
The main body includes the casing, the collision member guide, the release mechanism and all rigid fixed parts. 481
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The collision member includes the hammer head, the hammer shaft and the spherical rotary hand. The hammer head has a hemispherical polyamide surface with a radius of 10m. The hammer head is fixed to the hammer shaft, and the distance from the top of the hammer head to the front of the closing cone when the impact piece is at the release point is approximately the compression value of the spring in Table 14. When the release clip is at the point of releasing the impact piece, the cone spring is subjected to a force of approximately 5N. The release mechanism springs are adjusted so that they have just enough pressure to keep the release clip in the predetermined position. The pressure required to release the impact piece should not exceed 10N. The construction of the hammer shaft, hammer head and the adjustment of the hammer spring are such that the hammer spring has released all its potential energy when the top of the hammer head passes the impact face by about 1.
Release diagram
Cone spectrum
$18.5±0.1
1-02619
27.5±0.1
Release
Release mechanism spring release clip
Can spring
Figure 2 Spring-operated collision test instrument
Ball cock
Hardness: HR100
Dimension unit: mm
In the last 1mm of its operation before collision, the collision part has only kinetic energy, not potential energy. In addition, after the hammer head passes through the collision surface, if there is no other interference, the collision part can move freely for at least 8mm. Table 14
Kinetic energy before collision,
0.20±0.02
0.35±0.03
0.50±0.04
0. 7±0. 05
1.00±0.05
The approximate value of the kinetic energy before collision (unit joule) can be calculated by the following formula: E-0.5F.CX10#
F is the force exerted on the spring when it is compressed, unit N; C is the value of the compression of the hammer spring, unit mm
4.12 Vibration (sinusoidal) (running) test
4.12.1 Sweeping
Test the product's ability to withstand vibration in the use environment. 4.12.2 Test method
Approximate value of spring compression, mm
The test method shall be carried out in accordance with the test method of GB/T2423, 10--1995 Test Fc: Vibration Sine). The vibration shall be carried out in sequence on the three mutually perpendicular axes of the test sample, and each axis shall be perpendicular to the normal installation plane of the test sample. During the conditional test, the test sample shall be powered on and in normal monitoring state. For each specified functional mode (such as normal working state, fire alarm state or fault state), a fixed frequency range (minimum-maximum-minimum sweep frequency cycle (Note: 182
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The corresponding product standard must specify the functional mode used), and the functional test shall be carried out after the conditional test is completed. The vibration (operation) test can be combined with the vibration (endurance) test so that the sample is subjected to the endurance test after the operation test on each axis, and then the endurance test is carried out. Functional test.
4.12.3 Severity level
Frequency range, Hz
Acceleration value, (m.s2)
Displacement amplitude, mm
Number of axes
Sweep rate, oct/min
Number of sweep cycles on each functional state and each axis
10~150
1) For this type of severe product, the frequency range can be selected from the chart according to the different places of installation and use. 2) For relevant standards, the amplitude of displacement or acceleration (or both) can be selected according to the characteristics of the product. 4.12.4 Test equipment
The test equipment shall comply with the provisions of Chapter 3 of GB/T2423.10-1995. 4.13 Vibration (sinusoidal) (endurance) test 4.13.1 Self-
Test the ability of the product to withstand the influence of vibration for a long time. 4.13.2 Test method
0, and group
10~150
The endurance vibration test method shall be carried out in accordance with C/T2423.10-1995 Test Fc: Vibration (sinusoidal) test method. The vibration shall be carried out in sequence on three mutually perpendicular axes of the test sample, one of which shall be perpendicular to the normal installation plane of the test sample.
During the conditional test, the test sample is in a non-powered state. Functional testing shall be carried out after the conditional test. The vibration (endurance) test may be combined with the vibration (operation) test so that the sample is subjected to an endurance test after the operation test on each axis, and then to a functional test.
4.13.3 Severity level
Frequency range, Hz
Amplitude of acceleration, m·
Amplitude of displacement, mm
Number of axes
Frequency sweep rate, oct/min
Number of frequency sweep cycles for each axis
2～80
10～150
1) For this type of product, the frequency range can be selected according to the different places of installation and use. 2) Relevant standards can select the amplitude of displacement or acceleration (or both) according to the characteristics of the product. 4.13.4 Test equipment
0, 1 and
10~150
GB16838-1997
The test equipment should comply with the provisions of Chapter 3 of GB/T2423.10--1995. 4.14 Voltage fluctuation test
4.14.1 County
Test the ability of the product to work normally under the condition of rated working voltage positive fluctuation. 4.14.2 Test method
During the conditional test, the test sample should be connected to the power supply and in the normal monitoring state. Power supply is increased by 10% and decreased by 15% of the rated working voltage (or the upper and lower limits of the rated working voltage specified by the manufacturer), and functional testing is carried out under this condition. For products that use different power supply methods, it can be combined with other tests. 4.14.3 Severity level
Power supply method
Maximum power supply voltage Uma
Minimum power supply voltage Umin
Note: Unom in the table represents the rated working voltage. 4.14.4 Test equipment
Test equipment that meets the requirements of the test method can be provided. 4.15 Main voltage sag and interruption test
4.15.1 Purpose
Main power supply voltage
Unom(1-t-10%)
Uam(1-15%)
0, 1, 1 and
Other supply voltages
The upper limit of the rated working voltage specified by the manufacturer The lower limit of the rated working voltage specified by the manufacturer To test the product's anti-interference ability when the main voltage sags or interrupts (such as in the main distribution network, due to load switching and the action of protection components, etc.).
4.15.2 Test method
During the conditional test, the test sample should be connected to the power supply and be in the normal monitoring state. After the conditional test, the functional test is carried out. The test equipment should meet the requirements of generating a half or one AC main voltage cycle amplitude sag. The start and stop of the test should be taken at the zero crossing point of the AC power. The supply voltage should be reduced by a specific percentage from a specific cycle of the standard value. Each reduction test should be repeated ten times. The time interval between each test is 1ts. This test should be carried out for all products powered by the main power supply. 4.15.3 Severity level
Voltage sag.%
Sag duration, ms
That is, the number of half cycles, 50Hz
4.15.4 Test equipment
The test equipment consists of an AC power supply device that can provide short-term continuous sag and interruption. 4.16 Electrostatic discharge test
4.16.1 Purpose
0, 1, and
To test the product's immunity to electrostatic discharge caused by contact with static electricity personnel and objects. 4.16.2 Test method
Electromagnetic conditions: The electromagnetic environment of the test room should not affect the test results. 100
The test sample is placed on a test bench consisting of a 0.1m thick insulating bracket and a grounded reference plate for testing. The distance between the perimeter of the test sample and each side of the test bench shall not be less than: 100mm, and a distance of at least 1m must be left between the test room wall or other metal structure. 484
GB168381997
During the conditional test, the test sample shall be connected to the power supply and in normal monitoring state. Functional test shall be carried out after the conditional test. a) Direct discharge to the test sample
Electrostatic discharge shall only be applied to the points and surfaces of the test sample that the operator can normally touch. The discharge electrode of the electrostatic discharge generator shall not be perpendicular to the surface of the test sample. After each charge, the discharge electrode shall be immediately touched to the pre-selected test point outside the test sample. Regardless of whether arc discharge occurs, the tip of the electrode shall be in solid contact with the test point. After each discharge, the discharge electrode shall be removed from the surface of the test sample, and then the generator shall be re-triggered for the next discharge. Ten single discharges shall be applied to each test point. The time interval of a single discharge shall be at least 1s. b) Simulate the discharge to the object near the test sample. The electrostatic discharge generator should be placed 0.1m away from the test sample, with the discharge electrode between the reference plate. Ten single discharges are made to the reference plate relative to each contactable surface of the test sample, with a discharge time interval of at least 1s. Figure 3 Test diagram of table test sample.
Figure 4 Test diagram of cabinet test sample.
Electrostatic micro-electric generator
Parallel coupling device,
Electrostatic discharge generator power supply
Figure 3 Test diagram of desktop sample
Electrostatic discharge generator
Electrostatic discharge generator power supply
Parallel coupling device
Figure 4 Test diagram of frame sample
4.16.3 Severity level
Insulating bracket
Ground reference plate
Junction box with grounding terminal
-Protective conductor
Ground reference plate
Insulating bracket
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