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[Cites 0, Cited by 0] [Entire Act]

Union of India - Section

Section 25x in The Standards of Weights and Measures (General) Rules, 1987

25x.

(120/7)=11.34gNote.-This definition of significant fault far cumulative weighers does not include Min: A cumulative weigher would normally be used at or near to Max.(b)Limits of error for influence factor-testsThe following examples show how to determine the-limit of error for influence' factor testing for selective combination weighers and cumulative weighers when testing.(i)For selective combination weighers the maximum permissible error for any static test load during influence factor tests shall be 0.25 of the maximum permissible deviation for in-service verification for the, appropriate, mass of the fill divided by the square root of the average (or optimum) number of loads per fill.Example: Class X(1) selective combination weigher, where the average number of loads per fill = 4. For a static test load = 100 g the appropriate mass of the fill will be 400 g for which the maximum permissible deviation for in-service verification is.3%o i.e. 12 g.Hence the maximum permissible error for influence factor tests is: 0.25 (12g/4)=1.5g.(ii)For, cumulative weighers the maximum permissible error for any static test load during influence factor tests shall be 0.25 of the maximum permissible deviation for in-service verification for the rated minimum fill divided by the square root of the minimum number of loads per fill.Example: For a class X(i) instrument with Max = 1200 g and rated, minimum fill of 8 kg: 8 kg/ 1.2 kg = 6.67; therefore the minimum number of loads per fill = 7.The maximum permissible deviation (as specified in Table 1) for the minimum fill of 8 kg is 1.5%, i.e., 120 g. Hence the maximtiinl permissible error for influence factor tests is:
0.25(120/7)=11.35gNote.-For cumulative weighers the average number of loads per fill is not known. Therefore, it is not possible to define the limit of error for influence factors in terms of average loads per fill and appropriate mass of the fill. The above definition is based on maximum load and rated minimum fill.
(2)Influence factor testsSUMMARY OF TESTSTABLE2
Test Characteristic under test Conditions applied
Static temperatures Influence factor Mpe(*)
Temperature effect on no-load indication Influence factor Mpe(*)
Damp heat, steady state Influence factor Mpe(*)
Power voltage variation Influence factor Mpe(*)
Tilting Influence factor Mpe(*)
(*) mpe: maximum permissible error
(i)Static temperatures ((paragraph 2(5)(i)]
Static temperature tests are carried out according to Table 3 given below:TABLE3
Environmental Phenomena Test specification
  Reference of 200C
Temperature Specified high for 2 hours
  Specified low for 2 hours
  50C
  Reference of 200C
Object of the test: To verify compliance with the provisions in paragraph 2(5)(i) under conditions of dry heat (non condensing) and cold. The test specified in 6(2)(ii) of this Annex may be conducted during this test.
Test procedures in brief.  
Precondition: 16 hours
Condition of the EUT: Normal power supplied and "on" for a time period equal to or greater than the warm-up time specified by the manufacturer. Power is to be "on" for the duration of the test. The automatic zero-setting should be disabled.
Stabilization: 2 hours at each temperature under "free air" conditions.
Temperature: As specified in paragraph 2(5)(i)
Temperature sequence: Reference temperature of 200CSpecified high temperatureSpecified low temperatureTemperature of 50CReference temperature of 200C
Number of test cycles: At least one cycle.
Weighing test: After stabilization at the reference temperature and again at each specified temperature conduct the following:Adjust the EUT as close to zero indication as practicable. It is important to ensure that the test result is unaffected by the automatic zero-setting function which should, therefore, be disabled. The EUT shall be tested with at least five different static test loads (or simulated loads) including Maximum and Minimum capacities. When loading or unloading weights the load must be respectively increased or decreased monotonically.(a)Date and time(b)Temperature(c)Relative humidity(d)Test load(e)Indications(f)Errors(g)Functional performance
Maximum allowable variations: All functions shall operate as designed. All errors shall be within the maximum permissible errors specified in paragraph 2(ii)
(ii)Temperature effect on no-load indication
Note.-This test should not be performed for instruments that have automatic zero-setting as part of the automatic weighing process.The instrument is set to zero, the temperature is then changed to the prescribed highest and lowest temperatures as well as at 5°C. After stabilization, the error of the zero indication is determined. The change in zero indication per 5°C is calculated. The changes of these errors per 5°C are calculated for any two consecutive temperatures of this test.This test may be performed during the temperature test [(paragraph 6(2)(i)] of this Annex).
Maximum permissible The change in zero indication shall not vary by more than the maximum permissible error for influence factor tests for a load equal to the rated minimum fill for a temperature difference of 50C is calculated.
Condition of EUT: Normal power supplied and "on" for a time period equal to or greater than the warm-up time specified by the manufacturer. Power is to be "on" for the duration of the test.
(iii)Damp heat, steady state (paragraph 4(3)(ii)]
Damp heat, steady state test are carried out according to Table 4.TABLE 4
Environmental phenomena Test specification
Damp heat, steady state Upper limit temperature and relative humidity of 85 % for 2 days
SUPPLEMENTARY INFORMATION
Object of the test: To verify compliance with the provisions of paragraph 4(3)(i) under conditions of high humidity and constant temperature.
Precondition: None required.
Test load: One static test load close to minimum capacity.
Condition of the EUT: Normal power supplied and "on" for a time period equal to or greater than the warm-up time specified by the manufacturer. Power is to be "on" for the duration of the test.The zero-setting and zero-tracking facilities shall be enabled as for normal operation.Adjust the EUT as close to zero indication as is practicable, prior to the test.The handling of the EUT shall be such that no condensation of water occurs on the EUT.
Stabilization: Three hours at reference.temperature and 50% humidity. Two, days at the upper limit temperature as specified in paragraph 2(5)(i)
Temperature: Reference, temperature of 20°C and at the upper, limit as specified in paragraph 2(5)(i).
Relative humidity: 50%at reference temperature. 85% at upper limit temperature.
Temperature/humidity sequence: The reference temperature of 200C at 50% humidity. The upper limit temperature at 85% humidity. The reference temperature of 200C at 50% humidity.
Number of test cycles: At least one cycle.
Weighing test and test sequence: After stabilization of the EUT at reference temperature and 50% humidity apply the test load.(a)Date and time(b)Temperature(c)Relative humidity(d)Test load(e)Indications(f)ErrorsIncrease the temperature in the chamber to the upper limit and increase the relative humidity to 85%. Maintain the EUT at no load for a period of 2 days. Following the 2 days, apply the static test load and record the data as indicated above. Allow full recover of the EUT before any other tests are performed.
Maximum allowable variations: All errors shall be within the maximum permissible errors specified in paragraph 2(4)
(iv)Power voltage variation [paragraph 2(5)(ii)]
Power voltage variation tests are carried out ,according to Table 5.TABLE 5
Environmental phenomena Test specification
  Reference voltage
Voltage variation Reference voltage +10%
  Reference voltage – 15%
  Reference voltage
SUPPLEMENTARY INFORMATION
Object of the test: To verify compliance with the provisions of paragraph 2(5)(ii) under conditions of voltage variations.
Test procedures in brief.  
Precondition: None required.
Condition of the EUT: Normal power supplied and "on" for a time period equal to or greater than the warm-up time specified by the manufacturer.Adjust the EUT as close to zero indication as practicable, prior to the test. If it has an automatic zero-setting function then the instrument should be set to zero after applying each level of voltage.
Number of test cycles: At least one cycle.
Weighing test: The EUT shall be tested with a test load approximately equal to the minimum capacity. Zero-setting function shall be in operation.
Test sequence: Stabilize the power supply at the reference voltage within the defined limits and apply the test load.
Record the following data: (a) Date and time(b) Temperature(c) Power supply voltage(d) Test load(e) Indications (as applicable)(f) Errors(g) Functional performance
Maximum allowable variations: All functions shall operate as designed. All errors shall be within the maximum permissible errors specified in paragraph 2(4).
(v)Tilting [paragraph 2(5)(iii)]
Note.-This test only applies to instruments that will not be permanently installed.This test is not required for mobile instruments with a level indicator if it can be established that the tilt can be adjusted to 1% or less.
Test method: Static tests whilst the EUT is tilted.
Object of the test: To verify compliance with the provisions in paragraph 2(5)(iii) under conditions of tilt.
Test procedure in brief: The test consists of tilting the EUT both forwards and backwards, longitudinally and from side to side (transversely), while observing the weight indications for a static test load.
Test severities: Instruments without level indicators shall be tested at a tilt of 5%
Maximum allowable All indications shall be within maximum permissible errors specified in paragraph 2(4)
Condition of EUT: Normal power supplied and "on" for a time period equal to or greater than the warm-up time specified by the manufacturer. Power is to be "on" for the duration of the test.Adjust the EUT in its reference position (not tilted) as close to zero indication as practicable. If the instrument is provided with automatic zero-setting it shall not be in operation.The test shall be performed with a test load approximately equal to the maximum capacity.
Test sequence: Record the zero indication. Apply the test load and record the indication. Remove the test load.Without further adjustment to any control affecting metrological performance tilt the EUT to the appropriate extent in the opposite direction and repeat the static weighing tests as above.Tilt the EUT in the transverse direction to the appropriate extent and repeat the tests.Tilt the EUT in the opposite direction and repeat the tests.In order to determine the influence of tilting on the loaded instrument, the indication obtained at each tilt shall be corrected for the deviation from zero which the instrument had prior to loading.
(3)Disturbance tests (paragraph 4(1)(iii)]
(i)Sliort time power reduction
Short time power reduction (voltage dips and short interruptions) tests are carried out according to Table 6.TABLE 6
Voltage dips and short interruptions Interruption from reference voltage to zero voltage for one half cycle.Interruption from reference voltage to 50% of reference voltage for two half cycles.These mains voltage interruptions shall be repeated ten times with a time interval of at least 10 seconds.
SUPPLEMENTARY INFORMATION TO THE TEST PROCEDURES
Object of the test: To verify compliance with the provisions in paragraph 4(1)(iii) under conditions of short mains voltage interruptions and reductions while observing the weight indication for a static load approximately equal to the minimum capacity.
Test procedures in brief:  
Precondition: None required
Condition of the EUT: Normal power supplied and "on" for a time period equal to or greater than the warm-up time specified by the manufacturer.Adjust the EUT as close to zero indication as practicable, prior to the test. Zero-setting functions shall not be in operation. Not to be adjusted or readjusted at any time during the test except the reset if a significant fault has been indicated.
Number of test cycles: At least one cycle.
Weighing test and test sequence: The EUT shall be tested with a test load approximately equal to the minimum capacity.Stabilize all factors at nominal reference conditions. Apply the test load and record the following data:(a) date and time(b) temperature(c) power supply voltage(d) test load(e) indications(f) errors(h) functional performanceInterrupt the power supply to zero voltage for a period equal to one half cycle and conduct the test. During nterruption observe the effect on the EUT and record as appropriate.Reduce the power supply to 50% of nominal voltage for aperiod equal to two half cycles and conduct the test. Duringreductions observe the effect on the EUT and record, asappropriate.
Maximum allowable variations: The difference between the weight indication due to the disturbance and the indication without the disturbance either shall not exceed the values given in paragraph 4(2)(v), or the EUT shall detect and act upon a significant fault.
(ii)Electrical bursts (fast transient tests)
Electrical bursts tests (fast transient tests) are carried out for two minutes with a positive polarity and for 2 minutes with a negative polarity according to Tables 7.1, 7.2 and 7.3 given below:TABLE 7.1PORTS FOR SIGNAL LINES AND CONTROL LINES
Environmental phenomena Test specification
Fast transient common mode 0.5KV(peak)5/50ns T1/ThSkHz rep. Frequency
Note.-Applicable only to ports or interfacing with cables whose total length may exceed 3 m according to the manufactures functional specification.TABLE 7.2INPUT AND OUTPUT DC POWER PORTS
Environmental phenomena Test specification
Fast transient common mode 0.5kv(peak) 5/50ns T1/Th5 kHz rep. Frequency
Note.-Not applicable to battery operated appliances that cannot be connected to the mains while in use.TABLE 7.3INPUT AN OUTPUT AC POWER PORTS
Environmental phenomena Test specification
Fast transient common mode 0.5Kv(peak) 5/50ms T1/Th5 kHz rep. Frequency
A coupling/ decoupling network shall be applied for testing AC power ports.SUPPLEMENTARY INFORMATION TO THE TEST PROCEDURES
Object of the test: To verify compliance with the provisions in paragraph 4(1)(iii) under conditions where electrical bursts (fast transients) are superimposed on the mains voltage while observing the weight indication for a static test load pproximately equal to the minimum capacity.
Test procedures in brief:  
Precondition: None required.
Condition of the EUT: Normal power supplied and "on" for a time period equal to or greater than the warm-up time specified by the manufacturer. Reset the EUT if a significant fault has been indicated.
Stabilization: Before any test stabilize the EUT under constant environmental conditions.
Weighing test: With the single static load in place record the following with and without the transients:(a)Date and time(b)Temperature(c)Test load(d)Indications (as applicable).
Maximum allowable variations: The difference between the weight indication due to the disturbance and the indication without the disturbance either shall not exceed the value given in paragraph 4(2)(v) of Part I, or the instrument shall detect and act upon a significant fault.
(iii)Electrostatic discharge
Electrostatic discharge tests are carried out with test signals and conditions as given in Table 8 below:TABLE 8
Environmental phenomena Test specification
Electrostatic discharge 8 kv air discharge6 kv contact discharge
Note.-The 6 kV contact discharge shall be applied to conductive accessible parts. Metallic contacts, e.g., in battery compartments or in socket outlets are excluded from this requirement. Contact discharge is the preferred test method. 20 discharges (10 with positive and 10 with negative polarity) shall be applied on each accessible metal part of the enclosure. The time interval between successive discharges shall be at least 10 s. In the case of a non conductive enclosure, discharges shall be applied on the horizontal or vertical coupling planes. Air discharges shall be used where contact discharges cannot be applied. Tests with other (lower) voltages than those given in Table 8 are not required.SUPPLEMENTARY INFORMATION TO THE TEST PROCEDURES
Object of the test: To verify compliance with the provisions of paragraph 4(1)(iii) under conditions where electrostatic discharges are applied while observing the weight indication for a static test load approximately equal to the minimum capacity.
Test procedures in brief:  
Precondition: Normal power supplied and "on" for a time period equal to or greater than the warm-up time specified by the manufacturer. Reset the EUT if a significant fault has been indicated.
Stabilization: Before any test stabilize the EUT under constant environmental conditions.
Weighing test: With the single static load in place, record the following with and without electrostatic discharge:(a)Date and time(b)Temperature(c)Test load(d)Indications (as applicable)
Maximum allowable variations: The difference between the weight indication due to the disturbance and the indication without the disturbance either shall not exceed the value given in paragraph 4(2)(v) of Part I or the instrument shall detect and act upon a significant fault.