IS 9000(Part-3/sec.1 to 5) ELECTRICAL- ENVIRONMENTAL TEST FACILITY

Industry Outlook

Indian Standard 9000 Part 3 Section 1 to 5 was adopted by BIS, that’s Indian Standards Institution (ISI) on September 1st, 1977, proceeding to the finalization of draft by Environment Testing Procedures Sectional Committee, which was approved by the Electronics and Telecommunication Division Council.

The purpose of introducing IS 9000  Part 3 Section 1 to 5 is to introduce an uniform testing procedure for component type items and equipment type items, since they have been disappearing with technological development. 

In order to do that, it is in line with the principle adopted by IEC/ TC 50 Environmental Testing in the development of a unified series of standards of Environmental standards testing procedures as provided by IEC. 

As it IS 9000 Part 3 Section 1 to 5 falls under discipline of group of Electric environmental test facility, it can be estimated it covers distinct industry under its scope, which could be Indian household market (expected to grow annually by 5.68%) to kitchen appliance market (expected to grow with a CAGR of 6.66%).

Electric market offers a wide market to the manufacturers to introduce their products, therefore, providing an opportunity to grow and expand. However, to keep the public interest in view, IS 9000 Part 3 Section 1 to 5 introduced the motive **objective to ensure safety of the final consumers. **

Mostly, to ensure conformance with compliance requirements and in order to do that, product testing under IS 9000 Part 3 Section 1 to 5 is conducted, which especially emphasizes on, “Dry Heat Test,” as per Electric Environmental Test, defined in the same.

Product testing ensures that a product is safe and reliable for consumption, therefore, provides you easy access to an economy worldwide. Thus, a wider market access and higher sales. 

For more information with respect to the benefits of product testing let’s move to the next section.

Why is Product Testing Crucial | Importance of Product Testing

• One of the most important purposes of testing is quality assurance of a product that reflects high quality, safety, and reliability.
• Product testing allows the manufacturer to ensure the conformance with established technical standards to produce high quality and safe products.
• Build reputation and maximize the profit, considering that a tested product indicates quality assurance. 
• Helps in retaining customers, thus, providing a competitive edge.
• Helps in understanding distinct types of stress a product can endure, be it in case of weather, wear tear, and other conditions.
• In the initial prototyping stage, if you are trying to avail investment in order to manufacture your product in mass quantities, a tested product can allow you to achieve patent and investors as it shows the quality and functionality of the product.

With the benefits of product testing, we can clearly estimate how testing ensures quality assurance and product credibility. 

Since, it has been established how essential product testing is, now let’s move to the benefits of complying with standards.

What Are the Benefits of Complying With Standards?

Complying with standards offers numerous benefits to manufacturers and importers of the product, that further helps in building trustworthiness and reliability, thus retaining the customers.

Why, don’t we look at other benefits of the same -

• A certified product acts as a shield against penalties and fines which could be imposed for not certifying a product.
• A certified product serves as an evidence that a product has been tested and certified as per prescribed standards.
• A certified product provides a sense of security and safety to the consumers, thus ensuring easy acceptance.
• It provides a competitive advantage over competitors.
• Easy market acceptance as a product is tested and certified.
• Confirm the unmatched quality standards.
• Seamless to file government tenders.

With these benefits of ensuring conformance with IS 9000 Part 3 Section 1 to 5 standards and specifications, a manufacturer can establish that a product is safe, reliable, and credible, thus, confirming to unmatched quality standards. 

Now, in the next section, we will learn about test requirements and product scope of the IS 9000 Part 3 Section 1 to 5.

Scope of IS 9000 Part 3 Section 1 to 5

Here, let’s commence with scope and other associated information of each section, one by one -

IS 9000 Part 3 Section 1

IS 9000 Part 3 Section 1 provides information with respect to the dry heat test for both, heat dissipating and non-heat dissipating. Below mentioned table will help you obtain a better understanding of classification  of test under IS 9000 Part 3 Section 1 -

Typically, dry test under IS 9000 Part 3 Section has been classified into two -

1. Non-heat dissipating items -

• Sudden change of temperature
• Gradual change of temperature

2. Heat dissipating items -

• Sudden change in temperature
• Gradual change in temperature

For a better understanding of test under this standard, let’s move on to application of dry heat test -

Application of Dry Heat Test Under IS 9000 Part 3 Section 1

General

This process is provided in the standard intended for the items, which achieve temperature stability during the duration of the test procedure. Moreover, the time period of the test will commence only when the temperature stability has been achieved. 

Conversely, in some exceptional cases when temperature stability can not be achieved, the test procedure will commence when the testing chamber will achieve the temperature specified in the IS 9000 Part 3 Section 1.

1. For heat-dissipating items

An item will only be considered heat dissipating if the hottest point of the item's surface is 5-degree above if measured in free air conditions and the ambient temperature of the surrounding has been achieved after temperature stabilization. 

2. For non-heat dissipating items

In case of dry testing of non-heat dissipating items with sudden change in temperature, the item will be placed into the testing chamber, then the temperature of the chamber will be set as prescribed in the standard. 

That makes it an efficient and time consuming procedure. Moreover, it is to be only conducted if the effect of the sudden change in temperature on an item is not determined.

IS 9000 Part 3 Section 2

IS 9000 Part 3 Section 2 includes testing requirements of non-heating dissipating items with sudden change in temperature.

For a better understanding of test under this standard, let’s move on to application of dry heat test -

Application of Dry Heat Test Under IS 9000 Part 3 Section 2

1. General requirements

The dry heat test under IS 9000 Part 3 Section 2, an item remaining at the ambient temperature of the laboratory will be introduced into the chamber. However, the temperature of the chamber will change several times in accordance with the standard. 

Further, once the temperature stability has been received the item will be exposed to the conditions as prescribed in the standard for a defined period of time. It is to be noted that the item remains in non-operative conditions and forced circulation is subsequently being used in this test.

2. Test Apparatus Description 

The chamber in which the test will be carried out must meet compliance requirements as provided in the IS 9000 Part 3 Section 2, which is as applicable to the non-heating dissipating item with sudden temperature change. 

Certain aspects to keep in mind -

• The chamber must have the capability to maintain the prescribed temperature in working space within the specified tolerance. 

3. Severities 

The presented in the chamber will be changed as prescribed in the standard and as per the duration specified in the standard. Below mentioned are the values from which the temperature must be selected -

Temperature should be as follows -

• + 200 ± 2°C 
• + 175 ± 2°C 
• + 155 ± 2°C 
• + 125 ± 2°C 
• + 100 ± 2°C 
• + 85 ± 2°C 
• + 70 ± 2°C 
• + 55 ± 2°C 
• + 40± 2°C

Moreover the duration should be as follows -

• 2 hours
• 4 hours
• 16 hours
• 72 hours
• 96 hours

It is to be noted that, if this test is conducted to scrutinize the endurance and reliability of the item, it must be understood that the relevant requirements for such a test need to be met. Although, if the testing is only conducted to scrutinize whether an item will work in the high temperature, the conditioning of such item will be restricted to the duration till the item achieves temperature stability. 

4. Initial Measurements 

An item must be visually, electrically, and mechanically tested to scrutinize as prescribed by the IS 9000 Part 3 Section 2. 

5. Conditioning

The temperature of the chamber must remain as prescribed severity, while an item must be introduced at the ambient temperature in the chamber. Moreover, it must be unpacked, switched off, in its normal position and ready to use when introduced in the chamber, otherwise as prescribed. 

However, when the item is intended to use with particular mounting devices, these must be used for testing. 

Further, the item will remain in the chamber until it archives the temperature stability and re-establishes the chamber’s conditions. Also, if as per specifications, the item needs to be switched or loaded electronically with the purpose to ascertain its capability of functioning, it must be done in accordance with prescribed standard.

Additionally, if required by the specifications, the item must remain in operating condition as per duty cycle and loading conditions (if required) must be done as provided in the specifications. Thereafter, items will be exposed to the high temperature conditions for a duration as prescribed in the specification. 

Also, the stability of the temperature must be scrutinized from time to time once an item achieves the temperature stability. 

Once the test ends, the item will be subjected to the recovery process, however, if it was switched on or loaded, it must be switched off or unloaded prior to commencement of recovery procedure.

6. Intermediate Measurements

The appropriate specification might call for loading and/or measurements during or at the end of the conditioning when the item is still in the chamber. If such measurements are required, the appropriate specification must define the measurements and the period or periods proceeding to which they must be carried out. In order to perform these measurements, the item must not be removed from the chamber.

7. Recovery 

An item will remain in the recovery procedure for the minimum duration of an hour, since it provides appropriate time to an item to achieve stability temperature. However, if several items are tested simultaneously, then one hour won’t be appropriate for an item to achieve stability temperature, since it is appropriate time for a single. 

Therefore, in case of multiple or several items, the recovery period must be two hours and all measurements must be completed at the end of the recovery period.

Moreover, the item will be switched off or unloaded during recovery period, as prescribed in the specifications. Moreover, it is to be noted that, in case standard recovery conditions are not appropriate for the item to be tested, a call for ideal recovery conditions will be made as provided in the specification.

8. Final Measurement

An item must be visually, electrically, and mechanically tested to scrutinize as prescribed by the IS 9000 Part 3 Section 2. 

IS 9000 Part 3 Section 3

IS 9000 Part 3 Section 3 includes information with respect to the dry heat test for non-heat dissipating items with gradual change in temperature.

For a better understanding of test under this standard, let’s move on to application of dry heat test -

Application of Dry Heat Test Under IS 9000 Part 3 Section 3

1. General requirements

The test conducted under IS 9000 Part 3 Section 3, an item will be introduced in the chamber at the ambient temperature, while later on it will be changed to the temperature of the laboratory. Furthermore, the temperature will be gradually increased to the temperature which is ideal to the degree of severity as specified in the IS 9000 Part 2 Section 3.

Once the stability temperature has been achieved the item will be exposed to provided conditions for the particular duration of time and the item must remain in normally non-operating condition. Though, forced air circulation is normally used to conduct this test.

2. Test Apparatus Description

The testing chamber must ensure conformance with specified standard in order to conduct dry heat test on non-heat dissipating items with gradual change of temperature. The testing chamber must have the capability to maintain the prescribed working temperature with the purpose to maintain the tolerance as provided in the standard.

However, for homogenous conditions, forced air circulations could be used. 

Moreover, in order to restrict the radiation problems, after temperature stability has been achieved, the temperature of the walls of the chamber must not differ by the 3% of prescribed ambient temperature of the test.

This requirement is applicable to all the parts of the chamber walls and the item is unable to 'see' any heating or cooling elements which do not comply with this requirement. In addition to that, the absolute humidity must not exceed 20 gram of water per cubic meter of air. When the testing is performed at the temperature below 35-degree celsius, then the humidity must not increase by 50-degree celsius. 

3. Severities

The presented in the chamber will be changed as prescribed in the standard and as per the duration specified in the standard. Below mentioned are the values from which the temperature must be selected -

Temperature should be as follows -

• + 200 ± 2°C 
• + 175 ± 2°C 
• + 155 ± 2°C 
• + 125 ± 2°C 
• + 100 ± 2°C 
• + 85 ± 2°C 
• + 70 ± 2°C 
• + 55 ± 2°C 
• + 40± 2°C

Moreover the duration should be as follows -

• 2 hours
• 4 hours
• 16 hours
• 72 hours
• 96 hours

It is to be noted that, if this test is conducted to scrutinize the endurance and reliability of the item, it must be understood that the relevant requirements for such a test need to be met. Although, if the testing is only conducted to scrutinize whether an item will work in the high temperature, the conditioning of such item will be restricted to the duration till the item achieves te

mperature stability.

4. Initial Measurements

An item must be visually, electrically, and mechanically tested to scrutinize as prescribed by the IS 9000 Part 3 Section 3. 

5. Conditioning

The temperature of the chamber must be equivalent to that of a laboratory. While conditioning an item below are certain things to keep in mind -

• The item will be introduced into the chamber at the ambient temperature of the laboratory.  Moreover, it must be unpacked, switched off, ready for use state, and in its normal condition, unless otherwise specified.
• The temperature of the chamber must be gradually increased to the temperature which is ideal as per the degree of severity, including allowing some time for the item to reach temperature stability.
• The rate of temperature change in the chamber must not go beyond 1-degree celsius per minute and average duration must not exceed above 5 minutes.
• If required, the item must be switched on or electrically loaded and it must be checked whether it can function as per standard or not.
• If required, the item must remain in operating condition as per duty cycle and at the loading condition (if applicable) as provided in the specification or could be switched off.
• Then, the item must be exposed to the high temperature conditions for the period of time as defined in the appropriate standard.
• At the end of the duration of testing, the item must remain in the chamber and the temperature of the chamber would be gradually decreased to a value lying within the limits of standard atmospheric conditions for testing. The rate of change of temperature within the chamber must not exceed 1-degree Celsius per minute, averaged over a period of not more than 5 minutes.
• It is to be noted that, if the items were loaded or switched on during the test, these must be unloaded or switched off before gradually decreasing the temperature.
• As the test ends, the item is subjected to undergo recovery procedure in the chamber, unless specified otherwise.

6. Intermediate Measurements

The appropriate specifications might require loading and/ or measurements during or at the end of the conditioning while the item is still in the chamber. If these measurements are needed the relevant specifications must define the measurements and the duration after which they would be carried out. 

7. Recovery 

The item would remain under standard recovery conditions for an appropriate period for attainment of ambient temperature stability for at least one hour. However, if several items are being tested simultaneously, the maximum duration of recovery must be two hours, since one hour recovery duration is ideal for a single item.  

If needed by appropriate specifications, the item would be switched on or loaded and measured continually during the recovery period.  Moreover, if the standard recovery conditions are not ideal for the item to be tested, the appropriate conditions for other recovery conditions must be called. 

8. Final Measurements

An item must be visually, electrically, and mechanically tested to scrutinize as prescribed by the IS 9000 Part 3 Section 3. 

IS 9000 Part 3 Section 4

Indian Standard Part 3 Section 4 provides information with respect to the dry heat test for heat dissipating items with sudden change of temperature.

For a better understanding of test under this standard, let’s move on to application of dry heat test -

Application of Dry Heat Test Under IS 9000 Part 3 Section 4

1. General Requirements

To dry heat test for heat dissipating items with sudden change of temperature, an item will be introduced into the chamber while being at the ambient temperature, however later on the temperature would be ideal to the severity as provided in the prescribed standard. 

Once the temperature stability has been achieved, the item will be exposed to the conditions as provided in the standard. This is to be done, to define the item’s functioning under the test. Moreover, it is to be made sure that the cooling devices of the items are in accordance with as provided in the standard.

And the test conditioning must be designed to stimulate the effect of subjecting the items in the “free air conditions,” with appropriate thermal condensation characteristics of mounting. Under this test, no forced circulation is prefered, although forced circulation can be used in a tough or conditions which are impossible to meet conditions as prescribed for testing.

2. Test Apparatus Description

Testing chamber must comply with below mentioned conditions -

• The temperature of the testing chamber must be scrutinized by sensing devices to ensure conformance with compliance requirements.
• In case of testing without forced air, the size of the chamber should be large enough as compared to the size and amount of heat dissipation of the item to allow stimulation of effect of “free air,” conditions. 
• The chamber’s walls must be near the thermal black and must have an emissivity coefficient of not below 0.7. In order to limit radiation problems, the temperature of the walls of the chamber shall not differ by more than 3 percent of the specified ambient temperature for the test, expressed in K.
• In case of testing through forced air circulation, the velocity of air must be as low as possible.
• The absolute humidity must not exceed 20 gram of water vapor per cubic meter of air. When testing is performed at a temperature lower than 35°C, the relative humidity must not exceed 50 percent.
• In case of duty cycle, appropriate precautions must be taken if the temperature is maintained at the study figure.

3. Mounting

•  The thermal conduction and other relevant characteristics of the mounting and connections of test items must be prescribed in the appropriate specifications. 
• If an item is designed for mounting on a heat sink with unprescribed characteristics, the heat sink must contain thermal condensation and thermal capacity which must be appropriate to maintain its temperature close to test chamber temperature.
• In case no information is available regarding mounting, then the thermal conduction of the mounting must be low, such that the practical purpose of an item is thermally isolated.
• In the case of component type items, it might be essential to use mounting racks that contain all the information regarding individual specifications, which provides every essential detail associated with thermal characteristics of mounting and connections.
• In case, more than one item is being tested in the chamber, then it must be ensured that an item must not be disturbed by the availability of other surrounding items and mounting devices.

4. Severities

The severities which reflect the information with respect to temperature and duration of exposure are provided in the specification. The values must be chosen from the below -

Temperature should be as follows -

• + 200 ± 2°C 
• + 175 ± 2°C 
• + 155 ± 2°C 
• + 125 ± 2°C 
• + 100 ± 2°C 
• + 85 ± 2°C 
• + 70 ± 2°C 
• + 55 ± 2°C 
• + 40± 2°C

Moreover the duration should be as follows -

• 2 hours
• 4 hours
• 16 hours
• 72 hours
• 96 hours

5. Preconditioning 

Preconditioning of the item must be done as provided in the specification.

6. Initial Measurements

The item must be visually, electrically, and mechanically inspected, as prescribed in the IS 9000 Part 3, Section 4.

7. Conditioning

a. Item without artificial cooling

• Testing with no forced air circulation

When a single item being tested in the chamber -

• The temperature of the chamber shall be as prescribed in the severity. 
• The item must be introduced into the chamber shall be at the ambient temperature of the laboratory and must be unpacked, switched off, ready to use state, and in its normal position or as if specified otherwise. 
• An appropriate time must be provided for the chamber to re-establish its conditions and item to achieve temperature stability.
• An item must be switched on or electrically loaded to check its functioning capabilities. Then, an item must remain in operating condition as per duty cycle and at loaded condition as provided in the standard.
• Thereafter, the item will be exposed to the high heat temperature and the duration must be measured for the time when temperature stability has achieved.
• At the end of the duration, the item must be subjected to a recovery period. However, if the item must be unloaded or switched off prior to the commencement of the recovery period.

When more than one item being tested in the chamber -

• If more than one item is being tested in the same chamber, it is required that the surface temperatures measured at corresponding points on the test items must deviate from one item to another by more than 5 deg C or 5 percent of the difference between the surface temperature and the air (ambient) temperature, whichever is the greater.
• Testing with no forced air circulation

When a single item being tested in the chamber -

• The test velocity must be low, if possible not more than 0.5 meter per second.
• The item must be appropriately mounted in the laboratory and must be preserved from disturbed influences such as sunlight and drought. Once the temperature stability is being achieved the temperature of the hottest point, however, in case of larger or complicated items, the temperature of a number of representative points must be measured.

When more than one items are being tested in the chamber -

If more than one item is being tested in the same tender, the surface temperature measured at corresponding points on the test items shall not deviate from one item to another by more than 5 deg C or 5 percent of difference between surface temperature and air temperature which is greater.

 b. Item with artificial cooling

• The coolant supplied to the item must be in accordance with the specifications provided inthe IS 9000 Part 3 Section 4. However, if the coolant is the air, it must not be contaminated with oil or must not be dry enough to ignore moisture problems.
• Cooling system isolated from chamber - this type of items have cooling systems, which are either self-contained or which contains coolant from an extraneous source with the coolant flow and return lines isolated from the chamber.
• Cooling system isolated from chamber - items in which fresh cool air is brought into an extraneous source and then enter the chamber proceeding to the cooling of the item has taken place. While in case of items in which cooling air is being drawn from the chamber and is retimed to the chamber after fulfilling its cooling function.

8. Intermediate Measurements

The required specifications might be called with the purpose of loading and/ or for measurements during or at the end of the conditioning while the item is still placed in the chamber. In case of requirement of such measurements, an appropriate specification will define these measurements and duration of the carrying out such measurements.

9. Recovery

• The item must remain in the recovery period for an appropriate period of time in order to allow the item to attain temperature stability for at least an hour.
• In case of several items being tested simultaneously, the maximum duration of recovery is 2 hours and all the measurements must be done at the end of the specified period.
• If needed by appropriate specification the item must be switched on, loaded, and measured continually during the duration of the recovery period.
• In case the standard conditions are not ideal for the test of the item, other recovery conditions might be called.

10. Final Measurement

The item must be visually, electrically, and mechanically inspected, as prescribed in the IS 9000 Part 3, Section 4.

IS 9000 Part 3 Section 5

Indian Standard Part 3 Section 5 provides information with respect to the dry heat test for heat dissipating items with gradual change of temperature.

For a better understanding of test under this standard, let’s move on to application of dry heat test -

Application of Dry Heat Test Under IS 9000 Part 3 Section 5

1. General Requirements

Under IS 9000 Part 3 Section 5, the item at an ambient temperature of the laboratory will be introduced in the chamber and later on at the temperature of the laboratory.  Further, the temperature will be increased gradually as per the severity as provided in the appropriate standard. These relevant specifications represent the functioning of the items under the test.

In case of using any cooling device, appropriate care must be taken. 

These test conditions are being designed with the purpose to stimulate effects of free air conditions on the test item with defined thermal conduction characteristics of mounting. Moreover, the defined test temperature is termed as ambient temperature.

In addition to that, testing will be conducted preferably without air circulation, although forced air circulation might be used in tough or impossible to meet the conditions provided in the conditions provided in the appropriate standard.

2. Test Apparatus Description

a. Testing Chamber

• The testing chamber must ensure conformance with compliance requirements specified in IS 9000 Part 3 Section 5.
• The temperature of the chamber must be scrutinized with sensing devices located in the chamber as per IS 9000 Part 3 Section 5.
• In case of testing without forced air circulation, the size of the chamber must be large enough and the amount of heat dissipating should allow the test item to stimulate the effect of free air conditions.
• The walls of the chamber must be near the thermal black and must have an emissivity coefficient of not less than 0.7. While to restrict the radiation problems, the temperature of the walls of the chamber must not exceed above 3% after achieving the temperature stability of the specified ambient temperature with respect to the test, expressed in K. the mentioned is applicable to all parts of the chamber walls and the item must not “see” any heating or cooling elements which don’t comply with the requirements.
• In case if the testing is being carried out in forced air circulation, the air’s velocity must be as low as possible. 
• The absolute humidity of the chamber must not increase by 20 g of water vapor per cubic meter of air. And when the test is being carried out at the temperature below 35-degree celsius, the relative humidity must not exceed by 50%.
• In case duty cycle is specified, appropriate precautions need to be taken to ensure that steady test temperature is being maintained.
• In case of components, a staggering of on-periods will suffice considering that at any time distribution of components onboard is logically uniform throughout the test chamber. 

3. Mounting

The thermal conduction and other appropriate characteristics of the mounting and connections of the test are provided in the relevant specifications. Therefore, if an item is intended to use with particular mounting devices provided tests will be applicable to the same.

In case the item is designed for mounting on the heat sink with unspecified characteristics, the heat sink used must contain thermal capacity and thermal conduction appropriate to maintain its temperature near to the chamber to the chamber test.

However, if no information is available regarding mounting characteristics, the thermal conduction of mounting must be low such that the practical purposes of the item is thermally isolated. 

Moreover, in case of component type items, it is essential to use mounting racks in which individual specifications provide all the information with respect to the thermal characteristics of the mounting and connections. 

Lastly, when more than one item being test in same chamber, it must be ensured that an item must not distubed by the presence of the surrounding items and mounting devices.

4. Severities

The severities which reflect the information with respect to temperature and duration of exposure are provided in the specification. The values must be chosen from the below -

Temperature should be as follows -

• + 200 ± 2°C 
• + 175 ± 2°C 
• + 155 ± 2°C 
• + 125 ± 2°C 
• + 100 ± 2°C 
• + 85 ± 2°C 
• + 70 ± 2°C 
• + 55 ± 2°C 
• + 40± 2°C

Moreover the duration should be as follows -

• 2 hours
• 4 hours
• 16 hours
• 72 hours
• 96 hours

5. Preconditioning 

Preconditioning of the item must be done as provided in the specification.

6. Initial Measurements

The item must be visually, electrically, and mechanically inspected, as prescribed in the IS 9000 Part 3, Section 5.

7. Conditioning

a. Item without artificial cooling

• Testing with no forced air circulation

When a single item is tested in the chamber -

• The chamber must remain at the temperature of the laboratory.
• The item will be introduced in the chamber being at ambient temperature and must be unpacked, switched off, ready to use, and in its normal condition, unless specified otherwise.
• The temperature of the chamber will be gradually increased to the temperature appropriate to the degree of severity and appropriate time must be provided for the temperature to achieve temperature stability. Moreover, the rate of change of temperature within the chamber must not exceed 1-degree celsius per minute, average a duration not exceeding 5 minutes.
• The item must be switched on or electrically loaded and scrutinize whether it has the capability of functioning as per standard or not. The item must remain operated as per the duty cycle and the condition of the loading as provided in the standard.
• Then the item will be exposed to the high temperature conditions for the period of time as prescribed by the relevant specification. Thereafter, the duration must be measured once the temperature stability has been achieved. 
• Once the period ends, the item must remain in the chamber and the temperature must be gradually decreased to the provided value lying within the limits of the standard atmospheric conditions. While the rate of change of temperature must not exceed 1-degree celsius per minute and average over the period of not above 5 minutes.
• At the end of the period, the item is subjected to the recovery process in the chamber, unless specified otherwise.

When more than one item is tested in the chamber -

In case of more than one item being tested in the chamber, the surface temperature measured at corresponding points of an item must not deviate from one item to another, above 5 deg C or 5% of difference between surface temperature and air temperature, whichever will be greater.

• Testing with forced air circulation

When single item is tested in chamber -

• When forced circulation is allowed it would be scrutinized either through Method A or Method B, where forced circulation is allowed, might be used when it is not possible to ensure compliance with the conditions for testing without air circulation.

Method A - this method will be used in case the size of the chamber is large enough as provided in the specification, but the ambient temperature in the chamber will be obtained through air circulation.

The item will be placed in the chamber with both air flow and heat switched off, the item is subjected to loading conditions prescribed to elevate the temperature at which the test to be carried out.  

Moreover, once an item's temperature stability has reached temperatures of a number of representative points will be measured using a suitable monitoring device. The temperature rise which occurs at each point must be noted. Once the stability is achieved, the chamber air flow will be switched on and as the temperature stability has been achieved, the temperature of the representation points will be measured again. However, if the temperature is different from that measured without air flow by more than 5 deg C or any other value stated by the relevant specification, the velocity of the air is too high and must be reduced until the requirement of 5 deg C or other specified temperature difference has met. 

If this is not possible, Method B shall be used, which we will discuss in the next section.

Method B - In case, method A can not met, Method B will be used, as follows: 

This method is based on the assumption that the difference, A^"i. bet- ween the temperature of a hot point on the- test item and the ambient temperature of the surrounding air in free air conditions is more or less independent of the ambient temperature of the surrounding air. This applies only if A^Tii* 'ess than 25 deg C where the ambient temperature variation, A^a> does not exceed 30 deg C.

It shall be noted that the corrections cover convection errors as well as radiation errors.

For temperature difference, A^i. greater than' 80 deg C and/ or changes in ambient temperature, A^fe greater than 65 deg C, the validity of Method B has not been verified.

The item suitably mounted in the laboratory and protected from disturbing influences, such as sunlight and draughts, shall be subjected at room ambient temperature to the loading conditions specified for the elevated temperature at which the test is to be carried out.

When temperature stability has been reached, the temperature of the hottest point or, in the case of larger or more complicated items, the temperature of a number of representative points shall be measured. The temperature rise, A 7*i, which occurs at each point, shall be rioted.

The item is introduced into the test chamber, subjected to the specified loading, and the chamber temperature is adjusted to a value at which the points measured at room ambient temperature reach a stabilized value which is the algebraic sum of the ambient temperature specified for the test and A Tj. If A 1\ is less than 25 deg C, testing shall proceed in accordance with 9.1.1.

If A T\ is greater than 25 deg C, the corrected temperature, Tjb based on the specified test temperature, shall be determined as described in Fig. 2 of Section 4. The item shall be introduced into the chamber while both item and chamber are at room temperature. Then the item shall be switched on or electrically loaded as prescribed in the relevant specification and the chamber temperature raised.

The rate of change of temperature shall not exceed 1 deg C per minute averaged over a period of not more than 5 minutes.

The final value of the chamber temperature shall be adjusted to a value at which the point measured on the surface of the item at room ambient temperature reaches, the 'above-mentioned stabilized value 7V. This temperature shall be. maintained throughout the conditioning. Testing shall then proceed in accordance with 9.1.1.1(d) to 9. 1.1.1 -(h). A diagrammatic representation of Method B is given in Fig. 1 of Section 4.

When more than one item being tested -

In case of more than one time being tested in the chamber, it is to be ensured that the measured surface temperature at corresponding points of the an item must not deviate to the one another by more than 5 deg C or 5 percent of the difference between the surface temperature and the air, whichever is less. 

b. Item with artificial cooling

Appropriate specifications must specify the defined characteristics of the coolant supplied to the item. Moreover, in case of the coolant being air, it is to be ensured that air is not contaminated with oil and must not be dry enough to avoid moisture problems.

• Cooling system not isolated from chamber

Items in which cool air is brought from the extraneous source, thereafter passes to the chamber proceeding to the cooling of the item has taken place.

Conversely, items in which cooling air is drawn from the chamber and is returned to the chamber after fulfilling its cooling function.

• Cooling system isolated from chamber

Items of these cooling systems are self-contained or which obtain the coolant from an extraneous supply, with the coolant flow and return lines isolated from the chamber.

8. Intermediate Measurements

The appropriate specifications might call for loading and/ or measurements during or at the end of conditioning while the item would still be in the chamber. In case if such measurements are needed, it must be defined by the appropriate specifications and the period/ periods proceeding to which it would be carried out. 

In order to get these measurements, the item must remain in the chamber. 

9. Recovery 

The item must remain under recovery period for adequate duration of time with the purpose to attain temperature stability within an hour. Moreover, in case of several items being tested simultaneously and where one hour recovery duration is ideal in accordance with a single item, the maximum recovery period would be two hours and all the measurements must be completed by the end of this duration. 

If needed by appropriate specifications, the item must be switched on or electrically loaded and must be continually measured during recovery duration. However, if the conditions are not ideal for an item to be tested, appropriate specifications would need to be used for recovery conditions.

10. Final Measurements

The item must be visually, electrically, and mechanically inspected, as prescribed in the IS 9000 Part 3, Section 5.

How We Help Ensuring Conformance With IS 9000 Specifications?

• We will educate you concerning every aspect of IS 9000.
• We will check whether a product falls under the purview of BIS or not, including whether a product complies with the BIS standards or not, then, after mutual understanding, the project will move forward. 
• There is no better place to obtain it than JR Compliance because we will analyze the product requirements to give clear guidelines.
• JR Compliance has experienced expert professionals, who can assist you in the documentation, evaluation, and examination.
• We are equipped with the necessary resources to conduct a virtual pre-audit to confirm whether your manufacturing unit and production process are complying with provided specifications or not. 
• JR Compliance will schedule a meeting with the BIS officer for a factory audit.
• If you lack an in-house testing facility, we will help you in setting up one.
• We will coordinate with a BIS accredited laboratory for product testing.
• You can expect reliable and punctual service delivery as we will also visit the BIS office on your behalf if required.
• We invest our sustained efforts to meet the startled queries or demands of BIS.
• In case of any concern, we assure to provide the finest solution.

Conclusion

IS 9000, an Indian Standard applicable to electrical cables, which are usually used in the Mining industry and metro industries, is one of the major contributors to our economic development. Considering that, it is not only mandatory but necessary to ensure conformance with specifications mentioned in IS 9000 with the purpose to introduce your product in the Indian market.

Keeping the importance of conformance with compliance in mind, we - JR Compliance, a leading compliance service provider are equipped with experts and resources to provide you with above and beyond support to obtain a BIS certificate.

Till now, we have experience in providing compliance assistance to over 10,000+ global leaders such as Toray, Bombay Dyeing, Softbank, and others.

For details, get in touch with our experts.