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SAR testing

SAR, the full name is Specific Absorption Rate, means the electromagnetic wave absorbed or consumed by human tissue of unit mass. The unit is W/Kg or mw/g. It refers to the measured value of energy absorption rate when human body exposed to the radio frequency electromagnetic field.

Overview

Summary

SAR, the full name is Specific Absorption Rate, means the electromagnetic wave absorbed or consumed by human tissue of unit mass. The unit is W/Kg or mw/g. It refers to the measured value of energy absorption rate when human body exposed to the radio frequency electromagnetic field.

SAR test mainly aim at wireless products of which the antenna is within 20cm to people. It’s used to protect us from suffering from the hurt by wireless equipment with exceeded RF transmission value. Not all the products with wireless transmission antenna away from human body within 20cm need to do SAR test, Every country has other test method named MPE evaluation based on the products meeting the conditions above but have small power.

SAR test procedures and lead time
There are mainly 3 parts on SAR test: tissue validation-system validation-DUT test. Generally speaking, sales people will evaluate the test lead time according to the product spec. and frequency. Besides, need to consider about test report lead time, certification lead time. The more frequencies need to be tested, the longer time needed for the test.

AGC testing company has 2 sets of SAR test equipments which can shorten test time and meet the requirements for more clients’ test requirements including urgency item test requirements. Besides, the test frequency covers 30MHz-6GHz which nearly covers and can test all the products in the market. Especially to the 5G rapid popularization of Wi-Fi products in the market and low frequency-136-174MHz products, AGC can help clients solve the test and certification problems well and make products enter international markets smoothly.


Standards and Regulations

Different products in different countries have different requirements on SAR limit and test frequencies 
Table 1: Mobile phone 
Country CE FCC IC INDIA Thailand
Measurement Method EN50360
EN62209
EN62311
EN50566
ANSI C95.1
IEEE1528
47 CFR 2.1093
Reference KDB files、TCB files
IEEE 1528
RSS-102
EN62209
ANSI C95.1
IEEE1528
47 CFR 2.1093
Reference KDB files、TCB files
EN50360
EN62209
EN62311
EN50566
Limiting Value 2.0W/Kg 1.6W/Kg 1.6W/Kg 1.6W/Kg 2.0W/Kg
Average Material 10g 1g 1g 1g 10g
Frequency (MHz) GSM-900/1800
WCDMA-900/2100
CDMA-2000
GSM-835/1900
WCDMA-850/1900
CDMA-800
GSM-835/1900
WCDMA-850/1900
GSM-900/1800
WCDMA-2100
CDMA-2000
GSM-900/1800
WCDMA-850/2100

Table 2:push to talk
Country CE FCC IC
Measurement Method EN50360
EN62209
EN62311
EN50566
ANSI C95.1
IEEE1528
Reference KDB files、TCB files
IEEE 1528
RSS-102
EN62209
professional walkie talkie limit value 10W/Kg(with 50% duty cycle) 8W/Kg(with 50% duty cycle) 8W/Kg(with 50% duty cycle)
civil walkie talkie limit value 2.0W/Kg(with 50% duty cycle) 1.6W/Kg(with 50% duty cycle) 1.6W/Kg(with 50% duty cycle)
Average material 10g 1g 1g
Frequency(MHz) VHF (136-174)
UHF(400-470)
VHF (136-174)
UHF(400-470)
VHF (136-174)
UHF(400-470)

Table 3:PC
Country CE FCC IC INDIA Thailand
Measurement method EN50360
EN62209
EN62311
EN50566
ANSI C95.1
IEEE1528
Reference KDB files、TCB files
IEEE 1528
RSS-102
EN62209
ANSI C95.1
IEEE1528
Reference KDB files、TCB files
EN50360
EN62209
EN62311
EN50566
Limit value 2.0W/Kg 1.6W/Kg 1.6W/Kg 1.6W/Kg 2.0W/Kg
Average material 10g 1g 1g 1g 10g
Frequency (MHz) BT
WIFI-2.4G
BT
WIFI-2.4G,5G
BT
WIFI-2.4G
BT
WIFI-2.4G
BT
WIFI-2.4G
Note :GSM,WCDMA,CDMA,S-TDMA part is the same as that of mobile phone。


Product Scope

Classified by product type,including mobile phone,walkie talkie,tablet pc,notebook,USB dongle etc.;

Classified by signal type,including GSM,WCDMA,CDMA, S-TDMA,4G(LTE),DECT,BT,WIFI and 2.4G other products,5G product etc.;

Classified by certification type,including CE,IC, Thailand, India etc.,different countries have different specific requirements on SAR.


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