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Notice 2020 - DRS0012

July 20, 2020

Clarification on requirements set forth in issue 1 of SPR-002

This notice clarifies some of the requirements set forth in SPR-002, issue 1, Supplementary Procedure for Assessing Compliance with RSS-102 Nerve Stimulation Exposure Limits, based on inquiries and testing reports received as part of the certification process.


1. Probe and test equipment (meter) frequency range

Based on SPR-002, the test equipment (meter) must be operable from 3 kHz to 10 MHz. Should a probe have a reduced frequency span, the use of multiple probes to ensure coverage of the full frequency range from 3 kHz to 10 MHz may be employed as stated in section 5.2.1 of SPR-002.


2. Characterization for frequency range reduction

To reduce the investigated frequency range to less than the full 3 kHz to 10 MHz span, the applicant must demonstrate that:

The characterization is an analysis of the radiated emissions from the DUT over the entire frequency range from 3 kHz to 10 MHz. To ensure proper frequency range reduction, the applicant shall provide spectrum plot(s) over the entire frequency range of 3 kHz to 10 MHz demonstrating that there are no emissions outside the investigated or reduced frequency range.


3. Summation - single-axis probe

To satisfy the limits set forth in RSS-102 — Radio Frequency (RF) Exposure Compliance of Radiocommunication Apparatus (All Frequency Bands), the measurement summation must be performed over three axes, preferably with a 3-axis isotropic probe. Alternatively, the measurement may be performed with a single-axis probe where each orthogonal axis (i.e. x, y and z) is measured and collectively summed. All measurements performed with a single-axis probe shall use the method in section 6.6.1.3 of SPR-002 and demonstrate evidence of 3-axis measurement summation using equations (4) and/or (5), respectively.


4. Summation - multiple frequencies

The following section provides clarification on summation requirements for a DUT with multiple frequencies..


4.1 All frequencies included

All frequencies in the range of 3 kHz to 10 MHz shall be included in the assessment provided the field value is within 20 dB of the maximum level identified as stated in sections 6.6.1.1 (h) and 6.6.1.2 (h) of SPR-002.


4.2 Omitted frequencies

Devices with multiple frequency components and/or multiple antennas co-located in the measurement space with emissions that are less than 20 dB below the maximum level identified (-20 dBc) over the frequency range of 3 kHz to 10 MHz may be omitted from the assessment as stated in section 6.3 of SPR-002.

To justify the exclusion of a frequency, the applicant shall provide spectrum plot(s) over the entire frequency range of 3 kHz to 10 MHz demonstrating that emissions are less than 20 dB below the maximum level identified (-20 dBc).


4.3 Summation of measurements from multiple frequencies

To determine compliance with nerve stimulation limits:


5. ISED-recognized testing laboratory

All testing performed to demonstrate compliance with nerve stimulation (NS) limits set forth in SPR-002, shall be conducted by an ISED-recognized testing laboratory that has RSS-102 (NS) as part of their scope.


6. RSS-102 annex A - RF technical brief cover sheet

Revised versions of RSS-102 Annex A are now available. RSS-102 Annex A2 RF Technical Brief Cover Sheet should be included in the certification filing.


7. Nerve stimulation reporting

To demonstrate compliance with the nerve stimulation exposure requirements set forth in RSS-102 and SPR-002, an RF technical brief shall be provided for the assessment. Users shall measure and report both the E-field and H-field values along with the corresponding compliance distance as stated in section 6.6.1 of SPR-002.


8. Exemption limits from routine evaluation

The exemption limits from routine evaluation detailed in section 2.5 and annex C of RSS-102 do not apply to nerve stimulation. Applications for equipment certification subject to nerve stimulation requirements will not be accepted by ISED without a nerve stimulation evaluation.

If you have any questions or require additional guidance, use the General Inquiry form to contact ISED.

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