Tektronix DPT1000A Power Device Dynamic Parameter Test System – User Guide Overview

1. System Overview

The Tektronix DPT1000A is a comprehensive test system designed for the dynamic characterization of third-generation semiconductor power devices, such as Silicon Carbide (SiC) and Gallium Nitride (GaN). It addresses common challenges in high-speed switching tests, including driver circuit design, probe selection, noise suppression, and package adaptation. The system is delivered as an integrated cabinet solution, combining hardware and automated software to ensure safe, precise, and efficient testing during R&D, failure analysis, and production validation.

2. System Components

The DPT1000A system integrates the following key components:

• ‌High-Resolution Oscilloscope:‌ Typically utilizes Tektronix 5 Series or 6 Series MSO oscilloscopes for high-bandwidth signal acquisition.
• ‌Optical Isolation Probes:‌ Provides high common-mode rejection ratio (CMRR) for accurate high-side voltage measurements (e.g., VGS, VDS) without ground loop interference.
• ‌Double Pulse Test Driver Board:‌ Customizable drive circuits allowing adjustment of gate resistors and other parameters.
• ‌Signal Source:‌ Arbitrary Function Generator (AFG) for generating precise double-pulse gate drive signals.
• ‌High-Voltage Power Supply:‌ Supplies the DC bus voltage for the Device Under Test (DUT).
• ‌Thermal Control System:‌ Regulates chip temperature during testing.
• ‌High-Precision Current Sensors:‌ Ensures accurate current waveform capture with high bandwidth.
• ‌Safety Enclosure:‌ High-voltage protective housing to ensure operator safety.
• ‌Automation Software:‌ PC-based software for configuration, execution, data acquisition, and report generation.

3. Key Features and Capabilities

• ‌Comprehensive Dynamic Testing:‌ Performs standard Double Pulse Tests (DPT) to measure switching losses (Eon, Eoff), peak voltage/current, turn-on/off delays, rise/fall times, and reverse recovery charge (Qrr).
• ‌Dynamic RDS(on) Measurement:‌ Evaluates on-resistance under high-speed switching conditions.
• ‌High Flexibility:‌ Supports various chip packages and allows customization of driver board parameters (gate resistance, load inductance).
• ‌Simultaneous Multi-Channel Measurement:‌ Supports up to 8 channels, enabling synchronous testing of both high-side and low-side switches in half-bridge configurations.
• ‌Noise Optimization:‌ Advanced probing techniques and shielding minimize electromagnetic interference (EMI) and parasitic effects.

4. Typical Test Setup Procedure

1. ‌Preparation:‌ Install the DUT on the test fixture and connect thermal control if required. Ensure all connections are secure within the safety enclosure.
2. ‌Probe Connection:‌
   • Connect optical isolation probes or high-voltage differential probes to measure VDS and VGS.
   • Connect high-bandwidth current probes to measure ID.
3. ‌System Configuration:‌ Launch the automation software on the host PC. Select the appropriate test profile (e.g., SiC MOSFET, GaN HEMT) and configure parameters such as DC bus voltage, gate drive voltage, pulse width, and current limit.
4. ‌Calibration:‌ Perform deskew and offset calibration for all probes to ensure time alignment and measurement accuracy.
5. ‌Execution:‌ Initiate the test sequence via the software. The system automatically generates gate pulses, acquires waveforms, and performs calculations.
6. ‌Analysis:‌ Review the generated reports containing key metrics (Eon, Eoff, Vpeak, Ipeak, etc.) and waveform plots. Export data for further analysis if needed.

5. Safety Precautions

• Always operate the system within its rated voltage and current limits.
• Ensure the high-voltage protective cover is closed before initiating any test.
• Verify proper grounding of all equipment.
• Allow sufficient cooling time between high-power test cycles to prevent overheating.

Note: For detailed operational steps, specific software interface instructions, and technical specifications, please refer to the official Tektronix DPT1000A User Manual and datasheets provided with the system.