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Q1 gw_product_detail_bar.png gw_product_detail_bar.png Why the GDM-825xA series can not remember the last condition whilst turn the power on?

The GDM-825xA series is always running the factory-default condition when every time turns the power back on. To keep last condition for the next time power on, you should save the current condition as a user-default and then set the user-default to replace the factory-default when turn the GDM-825xA series back on at every time. For the method to save & recall a user-default, please refer to Save / Recall chapter in user manual.

Q2 gw_product_detail_bar.png gw_product_detail_bar.png What is the difference between basic accuracy and actual accuracy of LCR meters?

The Basic accuracy of LCR meters is the best accuracy you can get when testing in best conditions. Basic accuracy does not add the error from extra factors like fixtures or cables and under the optimum test signal, frequencies, highest accuracy setting or slowest measurement speed and impedance of the DUT. Therefore, it is really important to know the actual accuracy of the measurement you want to perform in real world. Measurement range, speed, test frequency and voltage level are the factors we need to consider.The Basic accuracy of LCR meters is the best accuracy you can get when testing in best conditions. Basic accuracy does not add the error from extra factors like fixtures or cables and under the optimum test signal, frequencies, highest accuracy setting or slowest measurement speed and impedance of the DUT. Therefore, it is really important to know the actual accuracy of the measurement you want to perform in real world. Measurement range, speed, test frequency and voltage level are the factors we need to consider.


Moreover, there are additional errors including dissipation factor (D) of the DUT, internal source impedance and ranges of the instrument, which all affect accuracy. The accuracy formulas will take into account each of the factors affecting accuracy.

Q3 gw_product_detail_bar.png gw_product_detail_bar.png Why the test voltage of IR Test is fixed at 500v or 1000V?

According to the test standards, the test is usually performed with a 500 or 1,000 volt DC potential.

Q4 gw_product_detail_bar.png gw_product_detail_bar.png Isn't Hipot Testing Alone enough?

No! A Hipot test will find “hard” breakdown failures, usually due “pin point” defects, by over stressing the insulation; it will not serve to verify the overall quality of the insulating material.No! A Hipot test will find “hard” breakdown failures, usually due “pin point” defects, by over stressing the insulation; it will not serve to verify the overall quality of the insulating material.

 

An IR failure is usually a “soft” failure (the IR value is too low) rather than the more catastrophic Hi-Pot failure (it smokes or soon will)

Q5 gw_product_detail_bar.png gw_product_detail_bar.png Are Hipot Test and IR Test different?

Hi-pot test is a deliberate application of an excessive amount of voltage intended to stress the product’s insulation system.Hi-pot test is a deliberate application of an excessive amount of voltage intended to stress the product’s insulation system.

 

IR test, it measures the quality of the insulation system and provides a measure of this quality in ohms or meg-ohms.

Q6 gw_product_detail_bar.png gw_product_detail_bar.png What is the ARC?

ARC (or called flashover) is a discharge through air around or over the surface of insulating materials, between parts at different potential or voltage.

Q7 gw_product_detail_bar.png gw_product_detail_bar.png What is the Ramp Time?

Ramp Time is the gradual increase of voltage from zero potential over a period of time.

Q8 gw_product_detail_bar.png gw_product_detail_bar.png What is the different between Continuity check and Ground Bond Test?

A ground continuity test only verifies that an electrical connection exists between the mains power ground and any conductive surface of the product.A ground continuity test only verifies that an electrical connection exists between the mains power ground and any conductive surface of the product.


A ground bond test, on the other hand, checks not only the existence of the ground connection, but also its ability to sustain high current. Most standards require that the resistance from mains ground (protective earth) to the conductive surface on the product not exceeds 0.1Ω.

Q9 gw_product_detail_bar.png gw_product_detail_bar.png What is the Ground Bond Test?

A ground bond test applies a high AC or DC current (25A or higher) to the mains ground connection and any exposed metal on the product to simulate a fault that may occur within a product.

Q10 gw_product_detail_bar.png gw_product_detail_bar.png What is the Continuity Check?

A continuity check applies a small current only to verify that an electrical connection exists between the mains power ground and any conductive surface of the product.

Q11 gw_product_detail_bar.png gw_product_detail_bar.png What is different between the Hipot Test and the Insulation Resistance (IR) Test?

Insulation resistance test is purely a DC test made at voltage levels equal to or less than the rated voltage of the DUT.Insulation resistance test is purely a DC test made at voltage levels equal to or less than the rated voltage of the DUT.


Hi-Pot test means the application of voltage (AC or DC) for beyond what the DUT will encounter in normal use, with the expressed purpose of stressing insulating materials beyond their normal operating ratings.

Q12 gw_product_detail_bar.png gw_product_detail_bar.png What is the Insulation Resistance (IR) Test?

Insulation Resistance is a measurement of the quality of insulating materials, either as “raw materials” or as part of a final component or assembly.Insulation Resistance is a measurement of the quality of insulating materials, either as “raw materials” or as part of a final component or assembly.


Useful for monitoring the effects upon insulating materials due to short term phenomena such as voltage stress testing and long term phenomena as aging, weathering, immersion etc.

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