In order to provide high accuracy safety test for product manufacturing, regulation compliance, and characteristics verification, the withstanding test voltage (AC 5kV Max./DC 6kV Max.) of the GPT-9800 Series can be adjusted in 2V steps, while the current measurement can be done with 1µA resolution and ±(1.5% + 30µA) accuracy to enable small leakage current measurements of the products of the components. In addition, the test voltage of insulation resistance of the GPT-9800 Series can be adjusted in 50V steps within its DC output range from 50V to 1000V, carrying a measurement accuracy of ±(10% of reading +1MΩ) at full scale (2000MΩ/9500MΩ). This provides the flexibility for performing I.R. measurements under variable levels of applied voltage.
As the Majority of safety regulations need an AC source for ground bond test, the GPT-9800 Series provides 6Vac voltage (open circuit) and 3A-30Aac current for ground bond test, meeting IEC 60601-1 requirements. Furthermore, open circuit detection (via SOURCE H, SENSE H and SOURCE L terminals) for ground bond testing is also provided to check if the test apparatus has been properly connected before the start of a test. This is to ensure the ground bond test is done accurately without any unnoticeable misconnection between the test leads and the test terminals. With these capabilities, the user is able to perform various safety tests and verifications with high flexibility, accuracy and confidence.
Safety Guarding
Self Check
To protect operator from high voltage shock and DUT from unintended damage, the protection functions are always in operation throughout the testing period. When the power is turned on, the GPT-9800 Series immediately goes through the self-check procedures to ensure that all test functions are performed under normal conditions, as the first protection function being applied.
The second protection function is activated once the "Start" (output) button is pressed. Within the 100ms initialization period of output start, the GPT-9800 will send a detection voltage (-100V) to check whether the DUT has any short circuit defect due to poor insulation before the high voltage is applied. This is to prevent high voltage or current from returning to the DUT during the test time. To protect DUT from insulation breakdown caused by the rapid increase of test voltage at output starts, and avoid flashover or arcing phenomena that could affect the test results, the GPT-9800 Series has a Zero Crossing Turn-On feature, which ensures the output voltage to always start from the zero crossing of a sine wave. Moreover, the adjustable voltage ramp-up time (0.1s~999.9s) allows the test voltage to slowly rise to the set test voltage to reduce the risk of damaging DUT during mandatory production testing.
Continuous Monitoring
Furthermore, after the voltage has ramped to the set test voltage, the GPT-9804 will continue monitoring the test voltage and cut off power output once any irregularity is detected. This provides both the safety tester and the operator with a high level protection, which allows the test to be done in a safe and accurate manner.