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[Cites 0, Cited by 0] [Section 25x] [Entire Act]

Union of India - Subsection

Section 25x(2) in The Standards of Weights and Measures (General) Rules, 1987

(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.