Reliable and Compliant Safety Testing

The GPT-9800/990 series delivers reliable safety testing with a maximum AC output of 200 VA and 500 VA. Each model is designed for specific testing needs:

• GPT-9804: 4-in-1 – AC, DC, insulation resistance, and ground bond tests, 200 VA
• GPT-9803: 3-in-1 – AC, DC, and insulation resistance tests, 200 VA
• GPT-9802: AC and DC tests, 200 VA
• GPT-9801: AC test only, 200 VA

• GPT-9904: 4-in-1 – AC, DC, insulation resistance, and ground bond tests, 500 VA
• GPT-9903A: 3-in-1 – AC, DC, and insulation resistance tests, 500 VA
• GPT-9902A: AC and DC tests, 500 VA
• GPT-9901A: AC test only, 500 VA

The high-efficiency PWM amplifier minimizes input voltage fluctuations and ensures accurate, stable measurements. These testers support all major safety standards, including IEC, EN, UL, CSA, GB, JIS, and more.

User-Friendly Interface

Designed for simplicity, the GPT-9000 features a clear panel layout, high-resolution LCD, and color LED indicators. Key tests, including AC (5 kV), DC (6 kV), insulation resistance (50–1000 V DC), and ground bond (AC 32A max.), are performed with stable output and high-resolution measurements. Test durations, ramp-up times, and trip limits are fully adjustable.

Advanced Functions

• “Sweep” function for point-by-point test result visualization and trend graphs
• Automatic voltage cutoff and DUT discharge for operator safety
• Open-circuit detection for ground bond tests
• 100 memory settings for individual or sequential tests
• Remote control via front terminal and rear I/O ports
• RS-232C, USB, and optional GPIB interfaces for PC control and data logging

Unique Sweep Function for DUT Characteristics Analysis

The GPT-9800 Series features a unique sweep function that displays a graph of DUT test results. Measurements are recorded point by point according to the applied voltage or current and test duration (ramp-up + timer), providing a complete view of parameter behavior.
Users can move a cursor along the graph to check measurements at specific times or applied source values, enabling monitoring of current or resistance changes throughout the test, rather than just obtaining a final value.

High Efficiency and Stable Output

Unlike conventional testers using variable transformers and class AB amplifiers, the GPT-9900 Series integrates a high-efficiency PWM amplifier with up to 98% efficiency. This reduces heat generation and cabinet temperature, enhancing reliability and service life.
The PWM amplifier is also less sensitive to input voltage fluctuations, delivering a stable high-voltage output with less than 1% regulation for precise DUT testing.

High Accuracy and Resolution Testing Performance

The GPT-9000 Series allows fine adjustment of test voltage (AC 5 kV / DC 6 kV) in 2 V steps, and current measurement with 1 μA resolution and ±(1.5% + 30 μA) accuracy, ideal for detecting small leakage currents.
Insulation resistance testing voltage can be adjusted in 50 V steps from 50 V to 1 kV, with ±(10% reading +1 count) accuracy for 2000 MΩ / 9.999 GΩ and ±(15% reading +1 count) for 50 GΩ, providing flexibility and reliability.
AC source for ground bond testing (6 Vac, 3–32 A) and open circuit detection ensure proper connection before testing.

Comprehensive Safety Throughout Testing

Upon power-on, operator and DUT protection functions are active. A self-check ensures normal operation. Pressing "Start" applies a ~50 V detection voltage for 100 ms to detect short circuits before high voltage is applied.
Zero Crossing Turn-On and adjustable ramp-up time (0.1–999.9 s) minimize DUT damage risks. Any abnormality automatically interrupts the output to ensure safe and accurate testing.

Multiple Operator Safety Protections

Interlock prevents voltage output without a dedicated key. Signal I/O inputs can connect to safety sensors, disabling output upon intrusion. High voltage output is cut within 150 μs at test completion or anomaly detection, and DUT terminals are automatically discharged.

Intuitive User Interface

The 240 × 64 LCD displays parameters, measurements, and test results (PASS / FAIL) clearly. Color-coded LED indicators show tester status, and function keys provide convenient test configuration.

Convenient Manual and Automated Testing

The GPT-9000 Series stores up to 100 test conditions, each with a unique 12-character name, enabling repeatable or automated testing.
Control is possible via the front panel, remote terminal, Signal I/O for PLC, or RS-232C / USB (GPIB optional), simplifying test data retrieval.

Ordering Information

• GPT-9801: 200VA AC Withstanding Voltage Tester
• GPT-9802: 200VA AC/DC Withstanding Voltage Tester
• GPT-9803: 200VA AC/DC & Insulation Resistance Tester
• GPT-9804: 200VA AC/DC, Insulation Resistance & Ground Bond Tester

• GPT-9901A: 500VA AC Withstanding Voltage Tester
• GPT-9902A: 500VA AC/DC Withstanding Voltage Tester
• GPT-9903A: 500VA AC/DC & Insulation Resistance Tester
• GPT-9904: 500VA AC/DC, Insulation Resistance & Ground Bond Tester

Included Accessories

• Power cord x1
• Interlock key x1
• Remote terminal cable GHT-119 x1
• Test lead GHT-114 x1 for GPT-9803/9802/9801
• Test leads GHT-114 x1, GTL-215 x1 for GPT-9804

Options & Accessories

• GPT-9KG1: GPIB card
• GPT-9KR1: RS-232 card
• GSB-01: Multiplex Scanner Box 8CH H.V
• GSB-02: Multiplex Scanner Box 6CH H.V / 2CH G.B.
• GHT-113: High Voltage Test Pistol (~1000 mm)
• GHT-117 / GHT-117 (EU): High Voltage Adapter Box
• GHT-118 / GHT-118 (EU): High Voltage / Ground Bond Adapter Box
• GHT-121: High Voltage Test Lead (~3000 mm)
• GHT-205: High Voltage Test Probe (~1100 mm)
• GTL-232: RS232C Cable, 9-pin, ~2000 mm
• GTL-247: USB Cable A-A, ~1800 mm
• GTL-248: GPIB Cable, ~2000 mm
• GRA-417: 19” 4U Rack Mount Kit