EMI/EMC validation for USB-C and USB Power Delivery (USB-PD) devices presents a unique set of engineering challenges. Devices must be evaluated under high power transfer, dynamic protocol negotiation, and high-speed data activity—conditions that often introduce noise and heat that lead to unstable loading or uncontrolled cabling effects that compromise the accuracy of traditional test equipment.
The CR-DPWR EMI/EMC Tester is purpose-built to address these issues. Rather than acting as a generic load or protocol exerciser, it functions as a chamber-ready USB-PD Dual Role Power tester that enables realistic, worst-case operational testing while keeping noise and heat emissions low.
Chamber-Ready USB-PD Tester with Low Self-Emissions
Unlike many USB-PD test instruments cannot be placed inside an EMI chamber due to the noise radiating or conducting characteristics of their internal switching regulators, control interfaces, or cabling paths, the CR-DPWR EMI/EMC is designed specifically to operate inside the chamber without leaking switching noise. This allows it to coexist with the Device Under Test (DUT) during radiated and conducted emission measurements.
Low self-emission performance ensures that measured EMI signatures are attributable to the DUT rather than the test equipment. This is particularly important during compliance pre-scans and debug sessions, where false peaks introduced by auxiliary equipment can lead to incorrect root-cause analysis or unnecessary design changes.
Dual Role Power (DRP) Capability for Comprehensive USB-PD Coverage
By supporting Dual Role Power operation, the CR-DPWR EMI/EMC can function as both a USB-PD source and sink. This capability allows engineers to validate EMI performance during role swaps, renegotiation events, and power transitions, which occur frequently in USB-C devices as a result of system states, cable orientation, or negotiated power contracts. Without Dual Role Power operation, transient states can produce momentary emissions spikes that affect compliance margins.
Single-Port USB Type-C Focus for Controlled Test Conditions
The use of a single-port USB Type-C interface allows engineers to isolate and control the power and data path under test. This avoids unintended coupling from multi-port test setups and simplifies correlation between observed emissions and specific USB-PD or USB-data activities. It also mirrors the real-world topology of chargers, sinks, and peripherals more accurately than multi-port simulators.
Stable Continuous Loading and Sourcing up to 100 W on VBUS
Supporting up to 100 W of continuous VBUS loading and sourcing is essential for USB-PD validation at the upper limits of the specification. Emissions typically increase with higher current flow due to larger di/dt transitions and higher magnetic field strength in power paths.
The CR-DPWR EMI/EMC’s ability to maintain a stable 100 W load over long durations allows engineers to observe EMI behavior under sustained worst-case power conditions rather than short bursts. This stability is particularly important for thermal equilibrium testing, where emission characteristics can shift as components heat up.
VCONN Power Sink Support up to 7.5 W
VCONN is often overlooked during EMI testing, yet electronically marked cables and active accessories can draw significant power from it. By supporting up to 7.5 W of VCONN sinking, the CR-DPWR EMI/EMC enables validation of emission behavior when both VBUS and VCONN are active simultaneously.
This capability is important for identifying emissions caused by cable electronics, Ra/Rd detection circuitry, or VCONN power conversion paths that may not be stressed during VBUS-only testing.
USB 2.0 and USB 3.2 Gen 1 (5 Gbps) Data Loopback
High-speed data lanes are a major contributor to radiated emissions, particularly in the 30 MHz to 1 GHz range. The CR-DPWR EMI/EMC supports USB 2.0 and USB 3.2 Gen 1 data loopback at 5 Gbps, allowing continuous data activity during EMI/EMC measurements.
This capability ensures that signal integrity-related emissions, common-mode noise, and lane-to-lane coupling effects are exercised during testing. It eliminates the need to choose between “power-only” and “data-only” test modes, enabling a more realistic operating profile.
Support for USB Type-A and Battery Charging 1.2 Detection
Support for USB Type-A and BC 1.2 (source-only) detection allows the CR-DPWR EMI/EMC to validate backward-compatibility scenarios. Many chargers and devices must support legacy charging modes, which often involve different detection resistances and current profiles that can alter emission characteristics.
Including BC 1.2 testing within the same platform reduces the need for separate test setups and improves coverage across product variants.
Optical-to-Ethernet Communication for Control and Monitoring
Optical communication is a defining feature of the CR-DPWR EMI/EMC architecture. By using optical links between the chamber and the control PC, the system eliminates conductive paths that could otherwise act as unintended antennas or noise injection points.
This approach significantly improves measurement integrity while also reducing cable bulk, simplifying chamber feedthroughs, and improving repeatability between test runs.
Demonstrated Low Conducted and Radiated Emissions
The product documentation includes conducted emission measurements on AC mains ports across the 150 kHz to 30 MHz range and radiated emission measurements from 30 MHz to 1 GHz in both antenna orientations. These results demonstrate that the CR-DPWR EMI/EMC contributes minimal background noise across regulatory frequency bands.
For engineers, this translates to greater confidence that observed peaks are DUT-related and not artifacts of the test system.
Safety and Stress Testing Under EMI Conditions
The CR-DPWR EMI/EMC allows safety and stress testing to be performed concurrently with EMI/EMC measurements. Over-voltage protection (OVP), over-current protection (OCP), long-duration thermal resilience testing, and USB-PD stress scenarios can all be exercised while emissions are monitored.
This integrated approach helps uncover interactions between protection mechanisms and EMI behavior, such as emission spikes during fault recovery or current limiting events.
Mechanical and Chamber-Friendly Design
The compact, shielded enclosure with filtered I/O is optimized for EMI chamber environments. Minimal cabling reduces setup complexity and variability, while the robust mechanical design supports long unattended test runs.
With defined dimensions and manageable weight, the unit can be easily repositioned or integrated into fixed chamber installations without disrupting existing workflows.
Open API and Automation Support
Modern validation labs increasingly rely on automation to improve throughput and repeatability. The CR-DPWR EMI/EMC provides an open API with support for C#, Python, and integration into NI TestStand environments across Windows and Linux platforms.
Through the API, engineers can automate cable attach/detach emulation, dynamic power loading, PD negotiation, voltage and current measurements, USB enumeration checks, PD message logging, and remote firmware updates. This makes the system suitable not only for R&D but also for regression testing and production-oriented validation.
Practical Applications Across the Validation Lifecycle
The combination of low self-emissions, high-power capability, data exercising, and automation support makes the CR-DPWR EMI/EMC applicable to USB-PD charger testing, USB-C device validation, worst-case emission stress testing, compliance pre-scans, and chamber automation setups.
Its ability to be deployed and configured within minutes reduces setup overhead and allows engineering teams to focus on analysis rather than instrumentation management.
Nip common issues in USB-PD EMI/EMC testing once and for all with the cohesive validation platform that enables accurate, realistic, and repeatable testing under true operating conditions. Gain the confidence you need for high-power, high-speed USB-C designs like never before.
