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QC/T 727-2017

Chinese Standard: 'QC/T 727-2017'
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BASIC DATA
Standard ID QC/T 727-2017 (QC/T727-2017)
Description (Translated English) Instrument for automobile and motorcycle
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard T39
Classification of International Standard 43.040.30
Word Count Estimation 21,248
Date of Issue 2017-04-12
Date of Implementation 2017-10-01
Older Standard (superseded by this standard) QC/T 727-2007
Quoted Standard GB 15082; GB/T 191; GB/T 2423.17; GB/T 2423.22; GB/T 2423.34; GB/T 2828.1; GB/T 8170; GB/T 19951; GB/T 17619; GB/T 21437.2; GB/T 21437.3; GB/T 28046.2; GB/T 28046.3; QC/T 238; QC/T 29106
Drafting Organization Dongfeng Motor Electronics Co., Ltd.
Administrative Organization National Automotive Standardization Technical Committee
Regulation (derived from) Ministry of Industry and Information Technology Bulletin 2017 No.14
Summary This standard specifies the classification, requirements, test methods, inspection rules, marking, packaging, storage and storage of instruments for automobiles and motorcycles.

QC/T 727-2017
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.30
T 39
Replacing QC/T 727-2007
Instrument for automobile and motorcycle
汽车, 摩托车用仪表
ISSUED ON. APRIL 12, 2017
IMPLEMENTED ON. OCTOBER 01, 2017
Issued by. Ministry of Industry and Information Technology of PRC
Attachment.
Number, name and date of implementation of 22 automotive industry
standards
No. Standard number Standard name Number of standard replaced
Date of
implementation
301 QC/T 727-2017 Instrument for automobile and motorcycle QC/T 727-2007 2017-10-01
302 QC/T 803-2017 Oxygen sensor for automobile QC/T 803.1-2008 2017-10-01
303 QC/T 1072-2017 Gear position sensor for automobiles 2017-10-01
304 QC/T 1073.1-2017 Accelerometers for automobiles - Part 1. Linear accelerometers 2017-10-01
305 QC/T 1074-2017 Technical specifications for automotive parts remanufacturing products 2017-10-01
306 QC/T 1075-2017
Technical conditions for metal
honeycomb carrier of exhaust catalytic
converter
2017-10-01
307 QC/T 777-2017
Technical conditions for
electromagnetic fan clutch of
automobile
QC/T 777-2007 2017-10-01
308 QC/T 1076-2017
Performance requirements and test
methods for continuously variable
transmission (CVT)
2017-10-01
309 QC/T 1077-2017
Terminology and definitions for
classification of automatic control
transmission for automobile
2017-10-01
310 QC/T 1078-2017 Advertising vehicle 2017-10-01
311 QC/T 1079-2017 Suction & delivery vehicle 2017-10-01
312 QC/T 1080-2017 Mobile loudspeaker for popularization of science 2017-10-01
313 QC/T 1081-2017 Electric power steering device for automobile 2017-10-01
314 QC/T 1082-2017 Motor for electric power steering device of automobile 2017-10-01
315 QC/T 1083-2017 Controller for electric power steering device of automobile 2017-10-01
316 QC/T 1084-2017 Sensor for electric power steering device of automobile 2017-10-01
317 QC/T 1085-2017 X-ray testing for light-alloy wheel of motorcycle 2017-10-01
318 QC/T 1086-2017 Technical conditions for range extenders for electric vehicles 2017-10-01
Table of Contents
Foreword ... 7 
1 Scope ... 9 
2 Normative references ... 9 
3 Classification of products ... 10 
4 Requirements ... 10 
5 Test methods ... 21 
6 Inspection rules ... 30 
7 Marking, packaging, storage and preservation ... 32 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009
“Directives for standardization - Part 1. Structure and drafting of standards”.
This standard is the revision of QC/T 727-2007 “Instruments for automobiles
and motorcycles”.
As compared with QC/T 727-2007, the main changes of this standard are as
follows.
- MODIFY the content of the application scope of standard, ADD the clock
products;
- MODIFY the content of the normative references;
- IMPROVE the upper limit of the temperature range;
- ADD the content of the clock unit;
- ADD the content of the basic error of the clock;
- ADD the requirements that the response time of the speedometer and
tachometer is to be determined through negotiation between the supplier
and the purchaser;
- CHANGE the name of the temperature influence test into the temperature
resistance test;
- CHANGE the technical conditions and test methods for vibration resistance,
to refer to the relevant contents of GB/T 28046.3;
- CHANGE the voltage fluctuation range in the operating voltage
performance, to make it consistent with the relevant content in GB/T
28046.2;
- ADD the contents of the antistatic discharge performance and conducted-
interference resistance;
- DELETE the contents of voltage interference test;
- CHANGE the content of radiated-interference resistance;
- ADD the contents of the test methods of the antistatic discharge and the
conducted-interference resistance;
- ADD the content of the clock’s basic error test;
Instrument for automobile and motorcycle
1 Scope
This standard specifies the classification, requirements, test methods,
inspection rules, marking, packaging, storage and preservation of instruments
for automobiles and motorcycles (hereinafter referred to as “instruments”).
This standard applies to speed odometers, tachometers, fuel gauges,
thermometers, pressure gauges, voltmeters, ammeters and clocks (hereinafter
referred to as “instruments”) for automobile and motorcycle. Other instruments
for motor vehicles may also make reference to this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB 15082 Speed meters for motor vehicle
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 2423.17 Environmental testing for electric and electronic products -
Part 2. Test method - Test Ka. Salt mist
GB/T 2423.22 Environmental testing - Part 2. Tests methods - Test N.
Change of temperature
GB/T 2423. 34 Environmental testing - Part 2. Test methods - Test Z/AD.
Composite temperature/humidity cyclic test
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1.
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
GB/T 19951 Road vehicles - Test methods for electrical disturbances from
electrostatic discharge
4.2.7 The unit of the pressure gauge is generally expressed in megapascals
(MPa). In principle, it is not less than two divisions. the lower limit value - the
intermediate value - the upper limit value, wherein the intermediate pressure
value is about one-half of the upper limit value of pressure.
4.2.8 The unit of clock is generally expressed in hours (h), minutes (min) and
seconds (s).
4.3 Appearance
4.3.1 The protective layer shall be uniform, free from obvious bubbles, spots,
rust, falling off, or other defects.
4.3.2 Glass or other transparent materials shall not have scratches or
refractions that affect accurate readings.
4.3.3 The division lines, symbols, numbers and other markings on the dial shall
be clear and complete.
4.3.4 The exposed portion of the meter indicator shall not have glare.
4.3.5 When the electrical instrument indicator is not working, its pointer shall be
below the initial division, it may also touch the starting division line. When the
mechanical instrument is not working, its pointer shall stop at the backstop
position, it shall not leave the starting division line.
4.3.6 The speedometer is used to record the number on the digital wheel of the
driving mileage, such number shall be completely arranged in the mileage count
window. For the mechanical mileage counter, the color indicating the numbers
of integer mileage and the decimal mileage shall be clearly distinguishable. The
integer part and the decimal part of the digital-display mileage counter shall be
clearly distinguishable. The cumulative mileage at the time of exit-factory shall
not exceed 10 km.
4.4 Indication status
When the signal changes smoothly, the pointer movement shall be smooth and
there shall be no jamming. For the digital-display instrument, when the signal
changes smoothly, its display value shall change accordingly, the display is
normal. At a constant angular velocity, the tachometer’s pointer is within the
range of 20% ~ 80% of the upper limit of speed in the scale; the speedometer’s
pointer is within a speed range of more than 20 km/h to 80% of the upper limit
of scale; the amount of swing shall be within ±1% of the upper limit.
4.5 Basic error
4.5.1 Under the environmental conditions as specified in 4.1.2, the basic error
of the pressure gauge is.
4.6.2 When the fuel gauge is abruptly changed from the lower limit to the upper
limit, the pointer of the fuel gauge shall point to more than 90% of the full arc
length of the scale within 3 min.
4.6.3 When the thermometer is abruptly changed from the lower limit value to
the upper limit value, the pointer of the thermometer shall point to more than
90% of the full arc length of the scale within 2 min.
4.6.4 When the test voltage value is abruptly changed from the lower limit value
to the upper limit value of voltage of the voltmeter scale, the pointer shall point
to more than 90% of the full arc length of the scale within 2 min.
4.6.5 The response time of the pointer of the speedometer and tachometer is
determined by negotiation between the supplier and the purchaser.
4.7 Damping of ammeter’s pointer
When the ammeter’s pointer moves to the upper limit of the scale, if cutting off
the current, the pointer must stop swinging within 3 s.
4.8 Overload (pressure gauge, ammeter)
4.8.1 Mechanical pressure gauges shall be capable of withstanding an overload
test of 1.2 times the upper limit pressure of the scale.
4.8.2 For the amperemeter whose upper limit value of current on the scale is
less than 50 A, it shall be able to withstand the overload test with three times
the upper limit value of current. For the amperemeter whose upper limit value
of current on the scale is equal to or more than 50 A, it shall be able to withstand
the overload test with two times the upper limit value of current.
4.8.3 After the test, it shall comply with the provisions of 4.4 and 4.5.
4.9 Torque of speedometer of magnetic-induction type
The torque for moving the mechanism of the speedometer of the magnetic-
induction type shall not exceed 0.02 N • m.
4.10 Withstanding voltage of insulation
The electrical instrument shall be capable of withstanding a test at the voltage
of 50 Hz and an actual sine wave of 550 V for 1 min. The insulation shall not be
broken down.
4.11 Resistance to temperature changes
The storage temperature and working temperature range of the instrument are
as shown in Table 4. The instrument shall be subjected to the test of resistance
h.
5.3.9 The clause 4.4 shall be checked in this test.
5.4 Test of pointer’s response time
5.4.1 Make the pressure gauge stably indicate the upper limit of pressure of the
scale, then abruptly change the signal source to the 0 position to output the
nominal value. When the pointer points to 10% of the upper limit value of
pressure, record the response time of the pointer.
5.4.2 Make the fuel gauge stably indicate the 0-division line of the scale, then
abruptly change the signal source to the 1-division line of the scale to output
the nominal value. When the pointer points to 90% of the full position value of
scale, record the response time of the pointer.
5.4.3 Make the thermometer stably indicate the lower limit of temperature of the
scale, then abruptly change the signal source to the upper limit of temperature
of the scale to output the nominal value. When the pointer points to 90% of the
upper limit of temperature of the scale, record the response time of the pointer.
5.4.4 Adjust the power supply voltage, so that the voltmeter’s pointer points to
the lower limit of voltage. After the indication is stable, abruptly change the
voltage of power supply to the upper limit of voltage of the scale. When the
pointer points to 90% of the upper limit of the scale, record the response time
of the pointer.
5.5 Damping test of ammeter’s pointer
Record the time elapsed when the ammeter’s pointer returns from the division
line of the upper limit of the scale after cut-off of power to motionless at 0
position. It shall take the average of the time which is measured in three tests.
5.6 Overload test
5.6.1 For the mechanical pressure gauge, it shall apply the pressure 1.2 times
the upper limit of pressure on the scale for 1 min. After the test, the pressure
gauge shall be placed at the environmental conditions as specified in 4.1.2 for
not less than 4 h.
5.6.2 Connect the ammeter into a circuit where the current value is three times
(or two times) the upper limit of the scale for 1 s, the test current is only applied
in either direction.
5.6.3 In accordance with the method specified in 5.3, check the indication status
and the basic error.
5.7 Test of magnetic-induction speedometer’s torque
First check the indicated value of the instrument under the environmental
conditions as specified in 4.1.2, then put the instrument into the high-
temperature box, heat up to 70 °C ± 2 °C with the box, maintain the temperature
for 2 h, then use the method as specified in 5.3 to check the indicated value,
thereby obtain the difference between the high-temperature and the indicated
value of the environmental conditions as specified in 4.1.2. Then take out the
instrument, place it under the environmental conditions as specified in 4.1.2 for
not less than 4 h, use the method as specified in 5.3 to check its indication
status and indicated value.
5.10.3 Test of resistance to low-temperature.
First check the indicated value of the instrument under the environmental
conditions as specified in 4.1.2, then put the instrument into the low-
temperature box, lower the temperature to -30 °C ± 3 °C with the box, maintain
the temperature for 2 h, then use the method as specified in 5.3 to check the
indicated value, thereby obtain the difference between the low-temperature and
the indicated value of the environmental conditions as specified in 4.1.2. Then
take out the instrument, place it under the environmental conditions as specified
in 4.1.2 for not less than 4 h, use the method as specified in 5.3 to check its
indication status and indicated value.
5.10.4 Inspection of instrument’s indicated values in high-temperature and low-
temperature status.
If the conditions are not available, it may also take the instrument out of the box
to carry out test immediately, it must not exceed 2 min.
5.11 Test of resistance to cyclic temperature & humidity change
Put the instrument into the test box in accordance with the normal working
position, set the parameters in accordance with the test parameters as given in
Figure 1. The test is carried out in the non-working state. After the test is finished,
it shall be placed for not less than 4 h under the environmental conditions as
specified in 4.1.2. Then use the method as specified in 5.3 to check the
indication status and indicated value.
5.12 Test of resistance to vibration
It is performed in accordance with the provisions of GB/T 28046.3. Fix the
instrument on the vibration test bench and in the normal installation position,
carry out the test under working condition. During the test, check whether parts
are loose or damaged and whether the indication status is normal. Then place
the instrument under the environmental conditions as specified in 4.1.2 for not
less than 4 h, use the method as specified in 5.3 to check its indication status
and indicated value.
5.17 Test of conducted immunity
The test of the electrical transient conducted immunity of the power line of the
instrument shall be carried out in accordance with the relevant provisions of
GB/T 21437.2 and GB/T 21437.3, or in accordance with the methods approved
by both parties after consultation with the user.
5.18 Test of radiated immunity
5.18.1 Test point.
During the test, the electronic and electrical instruments shall point to the
intermediate value.
5.18.2 Test of radiated immunity.
The test of radiated immunity of the instrument shall be carried out in
accordance with the regulations of GB/T 17619, or in accordance with the
methods approved by both parties after consultation with the user.
5.19 Test of durability
5.19.1 The pressure gauge shall be installed on the test bench in accordance
with the normal working position, the pressure gauge shall be subjected to the
full-scale alternating cycle, rising from the lower limit of the scale to the upper
limit of the scale and then returning back to the lower limit of the scale, which
forms a cycle, totally 30000 cycles are performed. During the test, it shall use
the visual inspection method to check whether there is abnormal change for
each part.
5.19.2 When the tachometer is installed on the test bench in accordance with
the normal working position for the test, the tachometer is subjected to
alternating speed cycle. For each cycle, make the indicated speed rise from 50%
of the upper limit of speed value of the scale to 80%, then return back to 50%
of the upper limit of the speed value, the test is lasted continuously for 340 h.
During the test, it shall use the visual inspection method to check whether there
is abnormal change for each part.
5.19.3 When the speedometer is installed on the test bench in accordance with
the normal working position for the test, the speedometer is subjected to the
alternating speed cycle. For each cycle, make the indicated speed of the
speedometer rise from 50% of the upper limit of speed value of the scale to
80%, then return back to 50% of the upper limit of speed value, the cycle period
is not more than 60 s, until reaching to the specified accumulative mileage.
During the test, check whether the mileage counter is jammed, whether the
mileage counter of digital-display type displays normally. After the test, use the
   
 
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