GB/T 5170.16-1985 Basic parameters verification method of environmental test equipment for electrical and electronic products Centrifugal testing machine for constant acceleration test GB/T5170.16-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Environmental testing equipment for electric and electronic products
Inspeetion methodsfor basic parametersof environmental testing equipmentsfor electric and electronic productsCentrifugal machines for constant acceleration testUDC 621.3
.002. 6-了9
GB 5170.16—85
This standard specifies the verification methods for basic parameters of centrifugal constant acceleration testing machine system (hereinafter referred to as testing machine) for constant acceleration test according to GB2423.15 "Basic environmental testing procedures for electric and electronic products Test Ga: Constant acceleration test method". The testing machine consists of a testing machine body, a control device, and a test parameter measurement and display device. 1 Verification items
1.1 Rated number
1.1.1 Maximum load.
1.1.2 Constant acceleration
, installation gauge radius;
Speed ​​range;
Constant acceleration range.
Speed ​​indication error
Speed ​​stability
Acceleration gradient
Tangential acceleration
Current collector contact positive
Note: Only for test machines with current collectors. Maximum sound level of radiated noise
Continuous operation time
2Main instruments for verification
Length mouse;
Digital tachometer (including photoelectric sensor); stopwatch,
Light source:
Microohmmeter:
Sound level meter.
National Bureau of Standards Issued on April 7, 1985
Implementation on January 1, 1986
3—General Provisions
3.1 Calibration Load
GB5170.16—85
The calibration load should be symmetrical in shape, its mass equal to the specified value of the maximum load, and its center of mass height and size should comply with relevant regulations. For some types of testing machines, it is also necessary to determine the number of calibration loads, the total mass and the weight of each load. The load should be reliably fixed on the workbench and should not be loose when working within the specified constant acceleration range. 3.2 Installation Calculation Radius
When the testing machine is in operation, the constant acceleration value on the test load installation calculation radius should be equal to the specified value of the constant acceleration. In general, when installing the test load (including the calibration load), the installation calculation radius should be equal to the nominal radius specified by the testing machine. 3.3 Determination of acceleration
The constant acceleration is determined by indirect measurement, that is, according to the measured turning radius and spindle speed, the constant acceleration value is calculated as follows: a = 0.00112Rn 2bzxz.net
where: α—
constant acceleration, 9
R——measured value of radius, m;
measured value of spindle speed, r/min.
3.4 ​​Determination of spindle speed setting value
The spindle speed setting value is calculated according to the constant acceleration specification value and the installation calculation radius as follows: no=29.88
where: n
spindle speed setting value, {/mini
constant acceleration specification value, 91
installation juice calculation radius, IIl.
4 Verification method
4.1 Verification of rated parameters of testing machine
The rated parameters of testing machine include:
Maximum load:
Installation calculation radius;
Speed ​​range;
Constant acceleration range.
4.1.1 Test conditions
According to the nominal radius value specified by the testing machine, select the length of the measuring range: a.
Fix the color disk painted according to the regulations reliably on the rotating part with a fixed speed ratio with the rotating disk or rotating arm of the testing machine, and place the photoelectric sensor in front of the color disk, and connect its output to the digital tachometer. 4.1.2 Test method
When the testing machine is fully loaded, measure the calculated radius of the load for verification, and its value is in accordance with the nominal radius value of the testing machine: a.
range.
The spindle speed is adjusted from the minimum to the maximum value, and the testing machine should be able to operate normally. The adjustable speed range should not be less than the specified speed 4.1.3 According to the measured installation calculation radius, the minimum and maximum values ​​of the upper spindle speed, the minimum and maximum values ​​of the constant acceleration are calculated according to formula (1) respectively. The range should not be less than the specified constant speed range. 4.2 Verification method of speed indication error
4.2.1 Test conditions
Follow the same as 4.1.1. b.
4.2.2 Test method
GB 5170.16—85
The testing machine is unloaded. Evenly select more than 5 speed values ​​within the specified speed range for measurement, and record the speed indication of the testing machine and the speed meter indication for verification.
4.2.3 Calculate the speed indication error n,-n2
by formula (3): n
-test machine speed indication, r/min
×100%
n2 The number of times the test is made, the indication of the digital tachometer for verification, r/min. 4.3 Verification method of speed stability
4.3.1 Test conditions
Same as item h of clause 4.1.1.
4.3.2 Test method
The test machine is unloaded, and the test is carried out at the upper and lower limits of the specified speed range. Within the specified time, measure at least 3 times evenly, and record the indication of the digital tachometer for verification. 4.3.3 The speed stability is calculated according to formula (4): Anmax × 100%
Where: no
Anmnax
Speed ​​setting value, r/min
The maximum deviation of the digital tachometer indication relative to the speed setting value in each measurement, /min. 4.4 Acceleration gradient verification method
4.4.1 Test conditions
Same as item a of clause 4.1.1.
4.4.2 Test method
After the test load is installed on the test machine, measure the calculated radius of the load, the minimum radius and the maximum radius. 4.4.3 The acceleration gradient ratio is calculated according to formula (5) and (6): T=
: Rmn
-minimum radius of the test load, m
maximum radius of the test load, m;
R—calculated radius of the test load installation, m. 4.5 Verification method of tangential acceleration
4.5.1 Verification method of tangential acceleration value-1) ×100%
） ×100%
（6）
When the testing machine is unloaded, use a stopwatch to measure the time for the spindle speed to rise from zero to the set value and from the set value to zero, respectively. According to formula (7), the ratio of the tangential acceleration is obtained and the larger one is taken.
0.0107n,R.
W: ns
: spindle speed setting value, r/min,
× 100%
R.——nominal radius of the testing machine, m
GB 5170.16-85
T--the time for the spindle speed to rise from zero to the set value or from the set value to zero, s; —the specified value of constant acceleration, 9.
4.5.2 Measurement of instantaneous value of tangential acceleration
4.5.2.1 Test conditions
Fix the color disk painted in accordance with the regulations securely on the rotating component with a fixed speed ratio to the rotating disk or rotating arm of the test machine. The photoelectric sensor is placed in front of the color disk, and its output is connected to the optical oscilloscope: 4.5.2.2 Test method
Measure the test load installation calculation radius. The spindle speed increases from zero to the set value, and then decreases from the set value to zero. The optical oscilloscope records the speed signal. The maximum value of the spindle speed change with a time interval of 1s is obtained on the recording chart. The tangential acceleration ratio is calculated according to formula (8): 0.641AnmaxRt
X 10 % ++++++
Where: Anmax—the maximum value of the spindle speed change per second, s\; R,——installation calculation radius, ml
ao——constant acceleration specified value, 9.
+..+. (8)
Note: When the line speed measured by the tangent-added average method is relatively large (>5%), the non-instantaneous value method should be considered for further verification. 4.6 Verification method of collector contact resistance
4.6.1 Test conditions
A pair of inner terminals in the collector is short-circuited, and the outer terminals are connected to micro-ohms. 4.6.2 Test method
The test machine is unloaded. The spindle speed is adjusted to the upper limit of the speed range, and the maximum value of the micrometer reading is recorded. 4.7. Maximum level of radiated noise The test machine is unloaded. The spindle speed is adjusted to the upper limit of the speed range, and the maximum value of the sound level is measured and recorded with an impact meter (A-number network) at a human height of 1m from the edge of the platform. 4.8 Verification method for continuous operation time
The test machine is fully loaded, the spindle speed is adjusted to the upper limit of the speed range, and the test machine can operate normally within the specified continuous operation time. GB 5170.16—85
Appendix A
Selection of verification items
(reference)
When the centrifugal constant acceleration testing machine is subjected to type identification, factory verification and regular verification, if there are no other provisions in the relevant standards or the supply and demand parties, the verification items can be selected according to the attached table.
In the table, the items that must be inspected are indicated by the symbol "0", and the items that are inspected by sampling or selected according to the situation (either the inspecting party or the inspected party proposes to inspect) are indicated by the symbol "△". No.
Inspection item name
Maximum load
Installation calculation radius
Speed ​​range
Acceleration range
Speed ​​indication error
Speed ​​stability
Acceleration gradient
Tangential acceleration
Current collector contact resistance
Radiated noise Maximum sound level
Continuous operation time
Type identification
Out! "Inspection
Periodic verification
Reference clause
GB 5170.16-85
Appendix B
Basic parameter error requirements
(reference)
When the testing machine is regularly verified, the error requirements of the basic parameters can refer to the following table. No.
Additional instructions:
Verification items
Installation calculation radius
Speed ​​indication error
Speed ​​stability
Tangential acceleration
Collector contact resistance
Error requirements
Not more than 10%
Not more than 0.502
This standard is proposed by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products: This standard is drafted by the Working Group on Basic Parameters Verification Methods of Environmental Testing Equipment. The main drafters of this standard are Yu Zengluo, 709 Factory, Ministry of Electronics Industry
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.