Updates on internal electric field strength (E-field) assessments using the DASY Module WPT
Through this Notice, Innovation, Science and Economic Development Canada (ISED) clarifies its position regarding the internal E-field assessment conducted per Section 5.1 of RSS-102.NS.MEAS.
| NOTE: While the contents of this notice pertain to specific equipment available from one manufacturer, ISED will accept other probe vendors or models if the measurement equipment meets the requirements of RSS-102.NS.MEAS. Moreover, ISED will provide guidance on other suitable probes, as required. |
For applicants who elect to perform internal E-field assessment per Section 5.1 of RSS-102.NS.MEAS, an enquiry is required. Until such time that RSS-102.NS.MEAS is updated, ISED will accept internal E-field assessments, without the need to submit an enquiry, using the DASY Module WPT provided the following conditions are met.
1. The DASY Module WPT (robot-based system) shall be used.
- The probe being used shall be V2 or higher. Assessments performed with earlier versions will not be accepted.
- The WPT software shall be at least V2.6. Assessments performed with earlier versions will not be accepted.
| NOTE: Assessment of the internal E-field using the MAGPy Version 2 Handheld System is still being evaluated by ISED, and therefore not subject to the provisions of this Notice. |
2. The guidance outlined in Revision 3, 05/24, and above of the application note and from 2.6 and above of the user manual published by the equipment manufacturer, SPEAG, shall be followed. Assessments performed with earlier versions will not be accepted.
3. The system check / validation test results using the standardized coils and comparison table to all values listed in the calibration certificate of the validation coils, including incident and induced quantities, shall be provided.
4. Direct exposure from the WPT source shall be assessed per Section C.2.3 of RSS-102.NS.MEAS.
5. The following settings shall be used in the WPT software:
- Total field evaluation: ON
Always required for ISED as there are no provisions for the contributions of the E-field to be omitted - Multi-frequency: ON
Can only be omitted (set to OFF) when all emissions within the frequency range of 3 kHz to 10 MHz are less than 20 dB below the maximum level identified of the fundamental frequency, see Section 5.3.4 of RSS-102.NS.MEAS for details. In all other cases, multi-frequency is required to be set to ON - Coverage Factor: ON
Desired, and highly recommended
6. The test plots provided by the WPT software shall include the following information:
- The field distribution, with a clear illustration of the -20 dB boundary. It is recommended to use the auto extend mode to ensure the full -20 dB boundary is assessed.
- All three tables produced by the system including the "incident fields, and induced quantities in the standardized phantom and anatomical model", "Standard compliance evaluation, Absolute" and "Standard compliance evaluation, Relative" tables.
- The test plot(s) shall clearly display the fundamental frequency, amplitude, and all emissions within the frequency range from 3 kHz to 10 MHz.
7. A detailed description of the test loads shall be provided.
In situations where a dummy load is used to assess Type 2 (category II radio apparatus) or Type 3 (category I radio apparatus) WPT devices, as defined in RSS-216, testing shall be repeated using a representative load such as a smartphone with a charging rate greater than or equal to the charging rate than the WPT source.
8. A characterization of the power profile of the load shall be provided to ensure the maximum charging rate is being exploited for testing.
Note that when testing using a device such as a smartphone, the maximum charging rate may not be initiated when the smartphone is in a very low state of charge. Testing shall be performed over a period of time such that the maximum charging rate can be seen to be activated.