Why is frequency fixing necessary for CE, FCC, TELEC, SRRC, and IC ID testing of wireless products? What is a frequency-fixed prototype?

 Why is frequency fixing necessary for CE, FCC, TELEC, SRRC, and IC ID testing of wireless products? What is a frequency-fixed prototype?



When testing wireless products in the laboratory, different frequency ranges and modulation methods are used depending on the wireless function. Common wireless functions include 2.4G, Bluetooth, Wi-Fi, and the latest 5G. The frequency and modulation method of a normally functioning product are not fixed. To test different frequencies and modulation methods, a frequency-fixed prototype is needed.


For example, the normal operating frequency of 2.4G Wi-Fi is 2412-2472MHz, with b/g/n modulation. Normally, it transmits randomly, making it impossible to test the corresponding data. Therefore, relevant frequency-fixing software or commands are needed to fix the frequency and achieve continuous transmission within a specific frequency band. Common frequency fixing methods: frequency fixing software, system frequency fixing, button frequency fixing. Common frequency bands: high, medium, and low frequency bands.


Frequency-fixed samples can enter the following modes:


(1) Continuous Receive Mode: operates at high, medium, and low frequencies.


(2) Continuous Transmit Mode: operates at high, medium, and low frequencies.


The above modes can be switched between receiving and transmitting modes via software.


WIFI Testing:


(1) The software can be set to 802.11 b/g mode. If n mode is supported, the software can also be set to enter n mode.


Operating frequencies: 2412MHz/2442MHz/2472MHz (CE)


2412MHz/2437MHz/2462MHz (FCC)


These frequencies are the frequencies we will test.


(2) The transmission rate and power of the test mode can be set. (During testing, the transmit power should be set to maximum.)


Additionally, **the software can control WIFI Channel 1~channel 13 (2412 MHz~2472 MHz), and each frequency point can be switched, making testing more convenient.


Bluetooth Testing:


(1) The test sample should be able to enter continuous transmit and continuous receive modes. The fixed frequency test frequencies are 2402MHz, 2441MHz, and 2480MHz.


(2) Test the sample's rate and power settings. If the rate supports 1Mbps and 3Mbps, both modes should be tested. During testing, the transmit power should be set to maximum.


(3) Frequency hopping mode test.


(4) Dwell Time test: The Dwell Time of Bluetooth transmit data packets under DH1/DH3/DH5 should be tested respectively.


(5) Bluetooth frequency hopping sequence. (The frequency hopping sequence of the 79 channels can be listed; the sequence should be random and without special patterns.)

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