SAR and HAC Labs

Service and Facilities - SAR and HAC Laboratories

For many body-worn and close proximity personal communication devices (such as cell phones, personal computers, PDA’s, walkie-talkies etc.) Specific Absorption Rate (SAR) testing is required. Rest assured that BACL can help you! With our in-house state-of-the-art SAR test lab (including the latest Schmid & Partner DASY4 system) we truly offer a one stop solution for all of your testing needs! With our constantly expanding accreditations and experienced staff, BACL is the solution to all your testing needs!

SAR Testing Applicable to: FCC, IC, EN R&TTE, etc.

Hearing Aid Compatibility (HAC) Testing
BACL has the capability to performs HAC testing for mobile devices, including RF Emissions and T-Coil measurements in accordance with ANSI C63.19.

HAC RF-Emission: The RF measurement requirements for HAC compliance are somewhat similar to SAR measurements. Both HAC and SAR measurements involve closely coupled near-field measurements over the face of the wireless device (WD) with a moving probe controlled by a robotic device. Testing for HAC compliance, the measurements for peak field strength are made in air and not through the tissue simulant fluid that is used when testing for SAR compliance. HAC testing also requires separate scans of the E (electric) and H (magnetic) field components, whereas for SAR testing, the power density is calculated by measurement of the E-field component. The E and H field HAC probes have an isotropic response and are calibrated in accordance with IEEE 1309.

Electric and Magnetic Field Category Rating Table:

RF PARAMETERS
Category	Hearing Aid Parameters (Hearing Aid must maintain < 55 dB IRIL interference level and < 6 dB Gain Compression)			Telephone Parameters
NEAR FIELD	E-Field Immunity (CW dB(V/m))	H-Field Immunity (CW dB(A/m))	E-Field Emissions (CW dB(V/m))	H-Field Emissions (CW dB(A/m))
Category U1	30.0 - 35.0 dB (V/m)	-23.0 - -18.0 dB (A/m)	46 - 51 dB(V/m) + 0.5 x AWF	-4.4 - 0.6 dB(A/m) + 0.5 x AWF
Category U2	35.0 - 40.0 dB (V/m)	-18.0 - -13.0 dB (A/m)	41- 46 dB(V/m) + 0.5 x AWF	-9.4 - -4.4 dB(A/m) + 0.5 x AWF
Category U3	40.0 - 45.0 dB(V/m)	-13.0 - -8.0 dB (A/m)	36 - 41 dB(V/m) + 0.5 x AWF	-14.4 - -9.4 dB(A/m) + 0.5 x AWF
Category U4	>45.0 dB (V/m)	>-8.0 dB (A/m)	<36 dB(V/m) + 0.5 x AWF	<-14.4 dB(A/m) + 0.5 x AWF
Category UX	special	Special	special	special

HAC T-Coil: Wireless Device’s T-coil performance is required in the HAC specification. For this, care must be exercised to separate the desired audio band magnetic signal emanating from the WD, from the undesired magnetic interference generated by incidental circulating currents in the WD’s circuits. For these T-coil measurements, two special probes have been designed to respond separately to the axial and transverse components of the magnetic field. The probes, no more than 10mm in diameter, contain tiny coils made up from more than 20 of ultra-fine (51 AWG) copper wire. The raw signals they detect must be amplified and filtered by specialized audio equipment to ensure the levels are completely unaffected by outside influences.

T-Coil Category Rating Table:

MAGNETIC COUPLING PARAMETERS
Category	Hearing Aid Parameters	Telephone Parameters
	Near Field Immunity (w/ 27.8 dBm CW into Dipole)	WD Signal Quality (Signal+Noise-to-Noise Ratio in dB)
Category U1T	75 - 85 dB(IRIL)	-10 - -20 dB + AWF
Category U2T	65 - 75 dB(IRIL)	0 - -10 dB + AWF
Category U3T	55 - 65 dB(IRIL)	10 - 0 dB + AWF
Category U4T	<55 dB(IRIL)	>10 dB + AWF
Category UXT	Special	special
(NOTE: A comparable hearing aid immunity test can be performed by fixing the acoustic output power requirement at 75 dB(IRIL) for all categories and varying the power into the dipole from 22.8 dBm for category U0, increasing by +5 dB for each higher category.)

Please contact our Compliance Experts for technical inquiries or our friendly Sales Team to schedule testing or a tour of our facilities