In summary, the GW Instek GPT-9803 is a benchtop electrical safety tester that performs AC withstanding, DC withstanding, and insulation resistance testing in a single 3-in-1 instrument. It is built on a high-efficiency PWM amplifier platform delivering 200 VA of AC output capacity, with high-resolution measurement (1µA current resolution, 2V voltage steps) and a 240 × 64 dot-matrix LCD for clear readout of conditions, parameters, and results. The instrument is designed to meet the test requirements of IEC, EN, UL, CSA, GB, JIS, and other safety standards applied to electrical products and components.

What is the GW Instek GPT-9803 used for?

The GPT-9803 is used for production-line safety testing, quality-assurance verification, and safety-standard compliance pre-qualification of electrical products. Typical devices under test include power cords, home appliances, information technology equipment, and medical equipment. Operators apply the tester at the manufacturing, regulation-compliance, and R&D stages to confirm that insulation barriers between live circuits and accessible surfaces are intact and that protective earth connections are reliable under fault current.

Which safety tests does the GPT-9803 perform?

It is a 3-in-1 model capable of AC withstanding, DC withstanding, and insulation resistance (IR) testing. IR is a lower-voltage DC measurement (50–1000 V) expressed in megohms, useful for trending insulation quality and for initial verification. All major test functions are performed under high-stability voltage output with high-resolution measurement results. Test duration, ramp-up time, and upper/lower limits are fully adjustable to accommodate a wide variety of safety tests.

The GPT-9803 delivers the following measurable performance against datasheet specifications: AC withstanding 0.100–5.000 kV at 200 VA, 40 mA max, 2V resolution, ±(1% of setting + 5V) accuracy; DC withstanding 0.100–6.000 kV, 10 mA max, 0.001 mA best resolution, ±(1.5% of reading + 30 µA) current accuracy; IR test 50–1000 V DC across 1 MΩ to 9500 MΩ range; Ramp time 0.1–999.9 s, test time off or 0.5–999.9 s, automatic DUT discharge within 200 ms; 100 MANU memory blocks plus 100 AUTO memory blocks with up to 16 steps per AUTO sequence. Output regulation is held to less than 1% under load variation, and the PWM amplifier topology achieves up to 98% efficiency — reducing internal heating and improving service lifetime compared to conventional transformer + class A/B designs.

The GPT-9803 addresses the electrical-safety regulatory framework that governs mains-connected products in global markets. The instrument is designed to support testing to IEC 60601-1 (medical electrical equipment), IEC 60335 (household appliances), IEC 62368-1 and IEC 60950 (information technology and audio/video equipment), and the corresponding UL, CSA, EN, GB, and JIS derivatives applied at certification and in production. GW Instek (Good Will Instrument Co., Ltd., established 1975, Taipei) is a global supplier of test and measurement instruments distributed through authorized partners worldwide.

Common applications

• Manufacturers consolidating hipot and IR tests into one bench footprint
• Quality-assurance environments that trend insulation resistance over time
• R&D pre-compliance testing where IR data informs design margin

Accessories Supplied

The GPT-9803 ships from the factory with the following standard accessories:

Optional Accessories

Product Core & Specifications

The GPT-9803 is built on a high-efficiency PWM amplifier platform with up to 98% efficiency, reducing internal heat versus conventional variable-transformer + class A/B designs. Output regulation stays under 1%. Hardware and software protections include power-on self-check, zero-crossing turn-on, output cutoff within 150µs of an abnormal condition, automatic DUT discharge within 200 ms, and a hardware safety interlock.

After "Start" is pressed, a 100 ms initialization applies ~100V to detect short-circuit defects before full test voltage ramps up. The 240 × 64 Ice Blue LCD displays conditions, parameters, measurement values, and pass/fail simultaneously, with multi-color status LEDs that flash whenever output voltage is present.

AC Withstanding Specifications

DC Withstanding Specifications

Insulation Resistance Specifications

General & Interface Specifications

This webpage was written by a human with an A.I. "Intern", which may contain errors. Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.