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

Union of India - Subsection

Section 25x(3) in The Standards of Weights and Measures (General) Rules, 1987

(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.