SAR exclusion

FCC ID: 2ARNH-13631680

RF Exposure Info

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FCCID_4152714

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                                SAR EXCLUSION DOCUMENT
Document 75943624-12 Issue 01

CE4 Tagger V4
13.56 MHz Transmitter:

FCC Standalone SAR Test Exclusion Considerations (KDB 447498 D01) Section 4.3.1 c)

<100 MHz – Separation Distance ≤50 mm or Separation Distance >50 mm and <200 mm

The 1g head or body SAR test exclusion thresholds for <100 MHz are determined by the following
steps:

Step a) Threshold result from Formula in Section 4.3.1 a);

[(max power of channel, including tune-up tolerance, mW) / (min. test separation distance, mm)]
[√f(GHz)] ≤ 3.0 for 1g SAR.

      •     f (GHz) is the RF channel transmit frequency in GHz.
      •     Power and distance are rounded to the nearest mW and mm before calculation.
      •     The result is rounded to one decimal place for comparison
      •     When the maximum test separation distance is < 5 mm, a distance of 5 mm is applied.

Step b) requires formula to be re-arranged to give power allowed at numeric threshold at 50 mm test
separation distance and Step c) requires f (GHz) to be set to 100 MHz (0.1 GHz) giving:

Step a) Power threshold = (3 * 50) / (√0.1) = 474.3 mW

Step b) Threshold result from Formula in Section 4.3.1 b) 1);

{[Power allowed at numeric threshold for 50 mm {Formula Step A})] + [(test separation distance – 50
mm)·(f(MHz)/150)]} mW

      •     fMHz is the RF channel transmit frequency in MHz.
      •     Power and distance are rounded to the nearest mW and mm before calculation.
      •     The result is rounded to one decimal place for comparison

Power threshold = 474.3 mW + [(test separation distance – 50 mm)·(f(MHz)/150)]} mW

Step c) requires f (MHz) to be set to 100 MHz giving:

Step b) Power threshold = 474.3 mW + [(test separation distance – 50 mm)·(100)/150)] mW




 Approved by                                                                            Date     21 November 2018
                    Matthew Russell
                    Authorised Signatory


2018 Not to be reproduced, except in its entirety,
without the permission of TÜV SÜD Product Service                                                                   Page 1 of 4


                                                      COMMERCIAL-IN-CONFIDENCE




DOCUMENT                759943624-12 Issue 01                   CONTINUATION PAGE

Step c) 1) Threshold result from Formula in Section 4.3.1 c) 1); >50 mm and <200 mm

Threshold result from Formula in Section 4.3.1 b) 1) is multiplied by [1+log(100/f MHz)]

Power threshold = [474.3 mW + (test separation distance – 50 mm)· (100)/150)] * [1+log(100/fMHz)]
mW

      •     fMHz is the RF channel transmit frequency in MHz.
      •     Power and distance are rounded to the nearest mW and mm before calculation.
      •     The result is rounded to one decimal place for comparison

Step c) 2) Threshold result from Formula in Section 4.3.1 c) 2); ≤50 mm

Threshold result from the formula in 4.3.1 c) 1) above for >50 mm and <200 mm for 50 mm and 100
MHz is multiplied by 0.5.

Power threshold = [474.3 mW + (50 mm – 50 mm)· (100)/150)] * [1+log(100/fMHz)] * 0.5 mW

Which simplifies to:

Power threshold = 474.3 mW * [1+log(100/fMHz)] * 0.5 mW

      •     fMHz is the RF channel transmit frequency in MHz.
      •     Power and distance are rounded to the nearest mW and mm before calculation.
      •     The result is rounded to one decimal place for comparison

SAR Exclusion Result (1 g Head or Body)

  Frequency            Maximum                Test Separation     SAR Exclusion      SAR Test
  (MHz)                Power (Tune up         Distance            Power Threshold    Exclusion
                       Value) *               (mm)                Section 4.3.1 c)   (Yes/No)
                       (mW)                                       (mW)


  13.56                4                      25                  443                Yes


*Tune-up value is the maximum declared conducted output power of the device.

The SAR exclusion threshold has been evaluated using the formula described above from information
supplied by the manufacturer below. Based on the calculation above, the EUT is categorically
excluded from SAR testing




2018 Not to be reproduced, except in its entirety,
without the permission of TÜV SÜD Product Service                                                Page 2 of 3


                                                      COMMERCIAL-IN-CONFIDENCE




DOCUMENT                759943624-12 Issue 01                CONTINUATION PAGE

Manufacturer’s Declaration of Product information (extract):

 Product Description:                                             Hand held electronic tester
 Model number:                                                    CE4 Tagger V4


 Antenna length (cm):                                                         4.5 x 4.5         Centimetres (cm)
                                                                              (4 turn coil)
 Frequency range:
              Bottom frequency:                                                                 MHz
              Middle frequency:                                               13.56             MHz
              Top frequency:                                                                    MHz


 Maximum power (input to the antenna including a                              0.00398           W
 tolerance):
 Antenna gain (or maximum gain allowed):                                      0                 dBi
Or
 Field Strength Measurement                                                                     dBµA/M
 Measurement Distance                                                                           cm


 Separation distance from antenna to the user/bystander:                      2.5               cm
 Transmitter Duty Cycle:                                                      20                %




2018 Not to be reproduced, except in its entirety,
without the permission of TÜV SÜD Product Service                                                          Page 3 of 3



Document Created: 2018-11-21 14:26:16
Document Modified: 2018-11-21 14:26:16

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