TOYOTA-ENGINEERING-STANDARD丰田工程标准TSC7048G.docx

TOYOTA ENGINEERING STANDARD
NO.:TSC7048G
TITLE:Bench test method for human exposure to electric and electronic equipment for vehicle
CLASS:C1
Established:/Revised: Rev.1 (Jan. 2020)
This standard has been revised as a result of the following changes because Chinese regulations and China rating standard were newly established:
(1) recommended device for the pre-operation inspection has been added (Section
4.6); and
(2) measuring instrument setting and the measurement method for the frequency range evaluation method have been reviewed (Sections 5.13 and 5.1.4).
Prepared and Written by Electronic Performance Development &Engineering Dept.Electronics Control System Development Div.
Design Quality Innovation Dept.TOYOTA MOTOR CORPORATION
Bench test method for human exposure to electric and electronic equipment
for vehicle
1. Scope
This standard covers the test bench for measuring the magnetic field intensity and magnetic flux density in a frequency range of 10 Hz to 400 kHz among the electromagnetic waves occurring from the electric and electronic components for vehicles. The purpose is to evaluate the influence of the electromagnetic waves occurring from the electric and electronic components for vehicles on the human body (human exposure).
2. Definitions
The main terms used in this standard are shown below.
(1) Human exposure
The human exposure refers to the state where the human body is exposed to the electromagneticwaves.
(2) Electric and electronic component for vehicle
The electric and electronic component for vehicle refers to the devices that control the systems mainly using the semiconductors, various detection deyices (sensors, etc.) that are used in combination with those devices, output devices (motors, actuators, electric heating wires, etc.), and the like.Also, if refers to the devices that include any of these devices.
(3) Time domain evaluation method
This evaluation method refers t6 the method specified in Section 5.5.2 of I EC 62233.
(4) Frequency range evaluation method (line spectrum evaluation)
This evaluation method refers to the method specified in Section 5.5.3 of IEC 62233.
(5) Weighed measurement result
The weighted measurement result refers to the final result of measurement into which the reference level depending on the frequency is incorporated. It shall conform to the equation (5) in Section 5.5.3 of IEC 62233.
(6) Reference level
The reference level refers to the magnetic field level that is derived from the basic restrictions by assuming the worst exposure conditions (example: exposure to uniform magnetic field). It shall conform to the ICNIRP guidelines.
(7) Basic restriction
Thie basic restriction refers to the restrictions that include a constant safety factor for the human exposufe to the time-varying electric field, magnetic field, and electromagnetic field based on the established biological influences. It shall conform to the ICNIRP guidelines.
(8) Exposure of general public
The exposure of general public refers to all exposures to the electromagnetic field that are applied to the general public.
(9) lest specimen
The test specimen refers to the equipment that is provided for the test. The test specimen is composed of the electric and electronic components for vehicle.
(10) Ground plane
The ground plane refers to the conductive metal plates that are placed under the test specimens, loads, simulators, or batteries. The ground plane is used as reference potential to simulate the vehicle body.
(11) AN (Artificial Network)
The AN refers to the line impedance stabilizing network. AN that is specified in CISPR 25.
3. Measurement Items
The measurement methods specified in this TS shall conform to the followings.
(1) Time domain evaluation method
This method shall conform to the "time domain evaluation" specified in Section 5.5.2 of IEC 62233.The exposure of general public in ICNIRP 1998 shall be applicable.
(2) Frequency range evaluation method
This method shall conform to the "line spectrum evaluation" specified in Section 5.5.3 of IEC 62233.The exposure of general public in ICNIRP 1998 shall be applicable.
4. Items Common to Both Measurement Methods
4.1 Frequency Range
The measurement frequency range shall be 10 Hz to 400 kHz. If it is impossible to cover this frequency range by a single measurement, add the weighted measurement result in each measurement frequency range.
4.2 Magnetic Field Measuring Instrument
Use of the following measuring instrument is recommended. However, other measuring instrument may be used provided that it meets the requirements in Section 4.3.
(1) Manufacturer: Narda S.T.S
⑵ Type: ELT-400
4.3 Items Required for Magnetic Field Measuring Instrument
(1) The magnetic field sensor shall be composed of 3 coils and shall have the measurement area of 100+5 cm2 with the axes orthogonal to each other in order to obtain the isotropic sensitivity.The outer diameter shall not exceed 13 cm.
The other size may be used if the performance equivalent to this magnetic field sensor can be secured. A single direction sensor (not isotropic) may be used in combination with an appropriate addition method.
(2) The magnetic field measuring instrument to be used in this standard shall be able to measure the items specified in Sections 5.5.2 and 5.5.3 of IEC 62233.
(3) The internal noise level of the magnetic field measuring instrument shall be 5 % or less by the time domain evaluation method. And also, the internal noise level shall be lower than the threshold limit of the frequency range evaluation method by 10 dB or more.
(4) The response time (the time to reach 90 % of a final value) of the magnetic field measuring instrument shall not exceed 1 s.
(5) The magnetic flux density shall be determined by averaging the values in 1 s.
(6) The exposure of general public in ICNIRP 1998 shall be applicable.
4.4 Precautions to Be Taken during Measurement
When measuring magnetic fields, conform to the following basic precautions.
(1) Evaluate the measured signals in relation to their frequency. In consideration of 2 or more independent magnetic field sources, adopt the largest measured value.
(2) Do not measure a magnetic field whose intensity is less than the maximum internal noise level.
(3) When conducting the final measurement for conformity judgment, fix the magnetic field sensor.
(4) The background noise of the measurement environment shall be 5 % or less by the time domain evaluation method. And also, the background noise shall be lower than the threshold limit of the frequency range evaluation method by 10 dB or more.
4.5 Items Required for Test Specimen
Unless otherwise clearly specified in Section 5, set the test specimen in accordance with the following method. However, when there are reasons for difficulties in setting, the setting method may be changed after obtaining the agreement between the departments concerned (engineering design department and evaluation department).
4.5.1 Operating Conditions for Test Specimen
Operate the test specimen and loads under the conditions equivalent to the conditions for the vehicle installation state, and drive them all the time during the measurement. When there are multiple operating conditions, the operating conditions may be determined by narrowing down to the conditions that maximize the electromagnetic waves occurring from the test specimen or harness.Operate the test specimen at an ambient temperature of 25+10 C. However, when there are operating conditions th^t maximize the electromagnetic waves at an ambient temperature other than 25+10 C, conduct the test under that conditions. When there are reasons for difficulties in ambient temperature setting, the setting method may be changed after obtaining the agreement between thedepartments concerned (engineering design department and evaluation department).
4.5.2 Connection of Load
Conduct the test by connecting all actual loads in the same manner as the vehicle installation state.In unavoidable circumstances, connect the dummy loads or simulators. When dummy loads or simulators are used, they shall be composed of the circuits that have the impedance characteristics equivalent to the .actual loads.
4.5.3 Connection of Harness
Conduct the test by connecting the harnesses whose wire types and wire diameters are equivalent to those of the harnesses installed in the vehicle. For both power line and load line, the overall length of the harness shall be 1700+300/-0 mm and all harnesses shall be bundled.
4.5.4 Grounding
The grounding for the test specimen and loads to be used shall be made equivalent to those in the vehicle installation state. When it is required to use a ground line in unavoidable circumstances, set the wire length to 300+ 100 mm and wire diameter to 5 sq.
4.5.5 Height of Test Specimen and Harness
Place the test specimen and harnesses at 50+5 mm above the ground plane. They shall be placed on non-conductive materials with low relative permittivity such as foam styrol. However, when the test specimen and harnesses are grounded to the frames (vehicle body) in the vehicle installation state, they may be set in that state.
4.5.6 Ground Plane
The ground plane refers to the conductive metal plates that are placed under the test specimens, loads, simulators, or batteries. The ground plane is used as reference potential to simulate the vehicle body. The metal plate shall be made of copper, brass, or aluminum, and shall have the dimensions of 0.5 mm or more thickness and 1000 x 2000 mm or more area, However, when there are only resin materials and no metal ground is provided for the applicable eleetric and electronic components in the vehicle installation state, the ground plane shatt not be used. For grounding in this case, connect the components to the negative terminal of the battery or the like under the conditions equivalent to the conditions for the vehicle installation state When there is a difference in the presence of the ground depending on the'installation vehicles, the test may be conducted only under the conditions where the ground plane is not used)
4.6 Calibration of Magnetic Field Measuring Inistrument
The calibrated magnetic field measuring instrument shall be used. The issuance of the calibration certificate and traceability certificate conforming to ISO 17025 is required, and the validity period shall be 1 year or less from the issuance.In addition, conduct the preoperation inspection before the measurement, and clearly describe the results in the test report that there is no abnormality in the magnetic field measuring instrument. In the preoperation inspection, it is sufficjent to generate a known magnetic field signal and confirm with the received signal that there is no failure in the magnetic field measuring instrument, cable, and connectorThe method should be arbitrary. Use of the following device is recommended for the pre-operation inspection.
(1) Manufacturer: Eiden Co., Ltd.
(2) Type: 7904A-SC1
4.7 Contents to Be Prepared before Starting Test
Before starting the test, study the following on the test specimen, and describe the results in the planning sheet. For the study, have sufficient discussions between the parties concerned.
(1) Identification of new points and change pointsldentify new points and change points in each level of the vehicle, system, and component.
(2) Examination of operating conditions for test specimen by DR, FTA (Fault Tree Analysis), FMEA (Failure Mode and Effects Analysis), and the likeldentify the conditions that maximize the electromagnetic waves occurring from the test specimen by DR, FTA, FMEA, and the like.
(3) Examination of operating conditions for test specimen by DRBFMFor the change points identified in (1), identify the conditions that maximize the electromagnetic wavesoccurring from the test specimen.
4.8 Submission of Planning Sheet
Create and submit the report after the measurement. Table 2 shows the items specified for the report. These items to be described in the report shall be agreed between the departments concerned (engineering design department and evaluation department) in advance. The discussed contents and determined items that are not described shall be invalid.
Create and submit the planning sheet before the measurement. Table 1 shows the items specified for the planning sheet. These items and contents to be described in the planning sheet shall be agreed between the departments concerned (engineering design department and evaluation department) in advance. The discussed contents and determined items that are not described shall be invalid.
Items to be described
Remarks(reference)
1
Name of test specimen
—
2
Installation position of test specimen
—
3
Operating conditions for test specimen
4.5.1
4
Load to be u§ed
4.5.2
5
Harness to be u§ed
4.5.3
6
Grounding
4.5.4
7
Contents to be prepared beforestarting te$t
4.7
8
Te§t layout
5
9
Magnetic field measuring instrumentto be used
4.2 ； 4.3
10
Copy of catibration certificate
4.6
11
Threshold limlit to be adopted
TSC7048G-1
Table 1:ltems to Be Described inng Sheet
4.9 Submission of Report

Table 2: Items to Be Described in Report
Items to be described
Remarks(reference)
1
Contents described in planning sheet
4.8
2
Change point from planning sheet

3
Identification number of test specimen
4
Measurement date
5
Person conducting measurement
6
Measurement result
Section 5
7
Criteria and judgment
8
Evidence data
9
Photo of measurement scene

5. Measurement Method
5.1 Setting Method for Measuring Instrument
All measurement methods not specified in Section 5 shall conform to I EC 62233
5.1.1 Setting of Measuring Instrument for Time Domain Evaluation Method Set the magnetic field measuring instrument as follows.
(1) Measurement mode: EXPOSURE STD 1998 Gen. Pub.
(2) RANGE: Low
(3) LOW CUT: 10 Hz
(4) MAX HOLD: MAX
(5) DETECT: RMS
5.1.2 Measurement Method for Time Domain Evaluation Method
Conduct the measurement for 1 s or more in each measurement position specified in Section 5.2 and later, and record the maximum value.
5.1.3 Setting of Measuring Instrument for Frequency Range Evaluation Method
(1) Set the magnetic field measuring instrument as follows.
(a) Measurement mode: 320 pT of Field Strength
(b) RANGE:Low
(c) LOW CUT: 10 Hz
(d) MAX HOLD: MAX
(e) DETECT: Peak
(2) For the frequency range evaluation method, use of the following measuring system or a digital oscilloscope is recommended.
(a) Manufacturer Eiden Co., Ltd.
(b) Type: 7904A-201
When a digital oscilloscope is used, connect the analog output lines in each of 3 axes (X/Y/Z) from the magnetic field measuring instrument to each channel (CH1/CH2/CH3) of the digital oscilloscope.
5.1.4 Measurement Method for Frequency Range Evaluation Method
Conduct the measurement in each measurement position specified in Section 5.2 and later. Conduct the F