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SPR-002 Testing of Nerve Stimulation Exposure Limits

Intentional radiator SPR 002 test evaluates the test methods to nerve stimulation requirements of RSS 102. As a leader in RF regulatory compliance testing, Keystone Compliance recognizes the requirements needed for wireless radio manufacturers. Meeting the ETSI, FCC, and other wireless testing specifications can be challenging. Not only do we understand the challenges, but we help guide companies through the process.

Our proven process helps avoid product launch delays by inviting our clients to review draft reports before final certification. Keystone Compliance’s accurate test reports are delivered quickly using our “four-eyes” approach. Meaning that multiple technicians review each report, ensuring that all the information required is present. From concept through compliance, Keystone meets all of our customers’ needs under one roof.

Request a quote to see why we are one of the fastest-growing wireless testing labs in the country. Contact us to receive more information on wireless Canadian SPR-002 compliance testing.

Summary of Wireless Testing of Nerve Stimulation Exposure

The SPR 002 test standard covers requirements for radiofrequency field strengths based on the effects of internal electric fields. The test also sets out general methods to nerve stimulation exposure limits on radio apparatus operating between 3 kHz and 10 MHz. The SPR wireless test does not cover any requirements that are based on internal electric fields. Nor does it cover specific absorption rates.

A full compliance assessment of the device under test must also consider exposure limits of RSS 102. The exposure limits are in conjunction with the requirements associated with nerve stimulation.

SPR-002 focuses on typical radio apparatus that employ continuous wave (CW) or narrowband pulse waveforms. This includes but is not limited to pulsed CW. 

Scope of SPR-002 Intentional Radiator Testing

The test environment should be free of ambient signals. If this is not possible in all situations, background noise can be measured and removed from the final measurements. The SPR 002 test environment is conducted in an open area. The area must be free of metal objects, which may influence the measurements.

The frequency range of the measurement probe should be from 3 kHz to 10 MHz. However, the frequency span is reduced and measured with multiple probes. The frequency range of investigation is less than 3 kHz to 10 MHz if the characteristics of the transmitter are known and there are no emissions produced by the device outside of the investigated frequency range.

The reference levels (RLs) for nerve stimulation are based on the total r.m.s. level. This requires that all frequency components from the apparatus be integrated using specific SPR equations, depending on the measurement performed. The sum of the ratios must be less than or equal to 1.

Multiple frequency components are harmonic emissions of the fundamental or multiple transmitters and their harmonics within a single device. Harmonic emissions that are less than 20 dBc are omitted from the assessment. 

Spatial averages in the E-field are performed through the vertical extent of the human body. The extent of the human body, in this case, is 1.8 m. Which represents a tall male adult, to provide a conservative measurement.

Expert SPR Canadian Wireless Compliance Testing

In addition to Canadian SPR compliance testing, Keystone has a full scope of expertise including pre-approved radio modules, simultaneous transmitters, and licensed radios. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling.

If you are ready to start your intentional radiator wireless testing, please request a quote. Have a question about our SPR and RSS test labs? Contact us or call (724) 657-9940 and we will determine the best course of action.