SAR Testing & Radio Frequency Exposure Flashcards
7 cards from real FCC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 SAR Testing & Radio Frequency Exposure flashcards as text
What does the acronym 'SAM' refer to in the context of FCC handset SAR testing?
Answer: Specific Anthropomorphic Mannequin
SAM (Specific Anthropomorphic Mannequin) is the standardized plastic head and torso phantom shell used to contain the tissue-simulating liquid during SAR testing of mobile handsets per IEEE 1528.
What is the FCC SAR limit for extremities such as hands, wrists, feet, and ankles?
Answer: 4.0 W/kg averaged over 10 grams
The FCC allows a higher SAR limit of 4.0 W/kg averaged over any 10 grams of tissue for extremities, recognizing that these body parts can tolerate greater localized heating due to lower thermal sensitivity.
Under FCC rules, a device is classified as 'portable' and requires SAR evaluation when the transmitting antenna operates within what distance from the human body?
Answer: 20 centimeters
Per 47 CFR Part 2.1093, a device is subject to SAR evaluation when its transmitting antenna is designed to operate within 20 cm of the human body during normal use.
Why is the temperature of the tissue-simulating liquid critical to monitor during SAR measurements?
Answer: Temperature changes the liquid's dielectric properties, directly affecting measurement accuracy
The permittivity and conductivity of the tissue-simulating liquid are temperature-dependent; deviations from the target temperature alter these electrical properties and introduce significant measurement errors.
What is the purpose of a system validation dipole (SVD) in a SAR test system?
Answer: To verify the overall SAR measurement system performance against a known reference standard
The SVD is a half-wave dipole with characterized SAR values used to validate the complete measurement system—including the probe, robotic scanner, and software—against traceable reference values.
How frequently must a SAR measurement system's E-field probe typically be calibrated to maintain accreditation compliance?
Answer: Annually
Accredited SAR testing laboratories are required to calibrate E-field probes on an annual basis to maintain measurement traceability and meet ISO/IEC 17025 accreditation requirements.
Which phantom configuration is used when evaluating SAR for a device designed to be worn against the body in a body-worn configuration?
Answer: Flat phantom with the device at the manufacturer-specified separation distance
Body-worn SAR testing uses a flat phantom filled with tissue-simulating liquid, with the device positioned at the manufacturer-specified or FCC-specified separation distance from the phantom surface.