GB/T 19483-2016Requirement and measurement methods of electromagnetic compatibility for cordless telephone (English PDF)

3.1 Terms and definitions

The following terms and definitions apply to this document.

3.1.1 Auxiliary equipment

Equipment (devices) connected to cordless landlines and mobile phones, and meet the following conditions at the same time.

a) Connect to cordless landlines and mobile phones to provide additional operation and/or control features (e.g., extend control to other locations);

b) It cannot be used independently of cordless landline and mobile phones, otherwise it cannot provide user functions separately;

c) The connected cordless landline and mobile phone can perform predetermined functions such as sending and receiving without this auxiliary device (that is, the auxiliary device is not

4.1 Test conditions and configuration

The test configuration should be close to the typical situation of actual use.

If the EUT is part of a system or connected to auxiliary equipment, then the test can be in the minimum configuration of the auxiliary equipment get on.

In the test, simulate actual working conditions and ensure that all different types of ports are tested.

The test conditions, test configuration and working mode shall be recorded in the test report.

When the EUT has a detachable antenna, unless otherwise specified in this standard, the antenna shall be installed in the same way as in normal use.

test.

The port that is connected during normal operation should be connected to auxiliary equipment during EMC testing, or connected to a properly terminated cable.

Connect to simulate the input/output characteristics of auxiliary equipment. The RF input/output ports should be terminated in a matched manner.

Ports that are not connected to cables during normal operation, such as service ports, program ports, temporary connection ports, etc., are not used during EMC testing.

Connect with any cable. If in order to excite the EUT, these ports should be connected to the cable, or the

The evaluation of EUT is not affected by additional cables or the extension of these cables.

If one CFP can carry multiple CPPs or one CPP can adapt to multiple types of CFPs, then each

CFP or CPP are tested separately.

4.2 Test layout of transmitter input port

The normal modulation signal should be generated by a signal source internal or outside the test environment to establish communication between EUT and SS.

Letter connection.

4.3 Test layout of transmitter output

SS should be placed outside the test environment.

If the EUT contains an external 50ohm radio frequency antenna port, the useful signal to establish a communication connection should be fed into the antenna through a coaxial cable.

When measuring, avoid the influence of disturbing signal on the measuring equipment.

If the EUT does not contain an external 50ohm RF antenna port (such as an integrated antenna device), the useful signal to establish a communication connection should pass

Antenna feed in the test environment. When measuring, avoid the influence of disturbing signal on the measuring equipment.

The output RF signal power level of the EUT should be set to the maximum.

4.4 Test Layout of Receiver Input Port

The signal source that provides the RF input signal of the receiver should be placed outside the test environment.

The signal source should provide the normal modulation of the EUT.

If the antenna of the receiver is an integrated antenna, the useful RF input signal to establish a communication link should pass through the test environment

Antenna feed. This antenna should be connected to an external signal source through a coaxial cable.

If the antenna of the receiver is detachable, the useful RF input signal to establish a communication link should pass through a shielded transmission line (Such as. coaxial cable) connected to the antenna connector of the EUT. This line should be connected to an external RF signal source. Appropriate measures should be taken

To suppress the common mode current from the outer conductor of the shielded transmission line into the receiver.

If it is not specified in the equipment manual, the level of the useful RF signal should be greater than that required by the receiver to meet the requirements in the performance criterion.

The minimum level is 40dB higher.

4.5 Test layout of the output port of the receiver

The test equipment for the output signal of the receiver should be located outside the test environment.

The audio output of the EUT is coupled to an audio analyzer located outside the test environment through a non-metallic sound wave tube, or other feasible

But it should be recorded in the test report.

If the EUT has a non-voice output, the output signal should be connected to the external test equipment outside the test environment through a non-conducted way (For example. read the display with a camera). If the useful output signal of the receiver can be output through the output connector or port, then this

The port should be connected to the test equipment outside the test environment through a standard cable under normal use.

4.6 Spurious disturbance measurement conditions

When measuring spurious disturbances, the EUT is in two working modes. dedicated and idle.

4.6.1 Dedicated mode initialization

On the centered channel, SS establishes communication with EUT according to the general call process.

EUT works at the maximum output power level.

EUT should prohibit frequency hopping.

4.6.2 Idle mode initialization

EUT has been powered on and can be used as the calling or called party for communication connection at any time.

4.7 Continuous disturbance measurement conditions and arrangements

The measurement should be carried out in the mode that produces the greatest disturbance during the normal operation of the EUT.

The continuous disturbance of the detected radiation should be maximized, for example by moving the EUT cable.

When conducting continuous radiation disturbance measurement, a communication connection can be established through SS.

4.8 Immunity test conditions and arrangement

4.8.1 Cordless mobile phone layout

When the transmitter is subjected to an immunity test, the transmitter should work at the maximum rated output power, use normal test modulation, and build

Set up the communication connection.

When the receiver is subjected to an immunity test, the useful input signal coupled to the receiver should be modulated by the normal test, and communication should be established connection.

When conducting an immunity test on the transceiver, the useful input signal coupled to the receiver should be modulated by the normal test. The sender should work

Operate at the maximum rated output power, use normal test modulation and establish a communication connection.

EUT should be fixed on a working frequency, and establish a communication connection through SS.

When EUT is required to be in transmit/receive mode, the following conditions should be met.

4.8.2 Layout of cordless landline

SS establishes a communication connection with CFP through a signal line. At the same time audio quality and demodulation differential mode noise level should be monitored and evaluated.

See Appendix A of GB/T 17618-2015 for details. The distance between the handle of the CFP and the base should be at least 80cm.

4.8.3 Joint arrangement of cordless mobile phones and cordless landlines

If CFP is only a converter from wired to wireless, only by establishing a communication link with CPP through the air link can voice, etc.

Function, then CPP and CFP should be tested together to establish a wireless communication link and the wireless link distance is at least 20cm.

If CFP can contact multiple CPPs, then only one CPP is needed.

If there is an integrated antenna device between CPP and CFP, in the radiation immunity test, CPP and CFP should be combined together.

Start testing, establish a wireless communication link and the wireless link distance is at least 20cm. If CFP can contact multiple CPPs, then only

Ask for a CPP.

4.9 Narrowband response of receivers and transceivers

The narrowband response of the receiver and transceiver during the discrete frequency test should be determined by the following methods.

During the immunity test, the voice output signal level should be monitored for voice equipment; for non-voice equipment, the loopback data from the EUT should be monitored.

BER. Both the narrowband response and the wideband phenomenon may cause an increase in the voice output signal level or BER. In this case, further judgment should be made.

Offset the test frequency by 2 times the channel bandwidth and repeat the test. If the voice output signal level or BER increase disappears, this

It is a narrowband response.

If the voice output signal level or BER increase does not disappear, it may be a narrowband response caused by another disturbance signal.

In this case, offset the test frequency point by 2.5 times the channel bandwidth and repeat the test.

If the voice output signal level or BER increase has not disappeared, it is considered a broadband phenomenon. That is, the EUT failed the test.

The narrowband response can be ignored.

4.10 Exempt frequency band

The exempt frequency band refers to the frequency band where the radiation immunity test is not carried out.

The low-end frequency of the receiver-free frequency band is the low-end frequency of the EUT receiving frequency band minus 5%; the high-end frequency is the EUT receiving frequency band

Add 5% to the high-end frequency.

The test-free frequency band of the transmitter is 3 times the channel interval, and the center frequency is the rated operating frequency of the transmitter.

5.1 General requirements

The establishment and maintenance of communication connections, CPP audio evaluation, and CFP audio evaluation are used as performance criteria to ensure immunity

The basic functions of the receiver/transmitter were evaluated in the test. In addition, the test should be performed in the idle mode of the transceiver to ensure that the transmitter does not

Misoperation occurred.

The maintenance of the communication connection should be assessed by an indicator, which can be part of the SS or EUT.

The equipment shall meet the minimum performance criteria specified in the following sections.

The CPP that uses AC power supply should also meet the requirements of this standard for stationary use. Equipment input/output arrangement and performance

The performance criterion can remain unchanged.

5.2 Performance criterion A of transmitter

During the test, a communication connection should be established and maintained.

For CPP, when using an audio BPF with a CF of 1kHz and a BW of.200Hz, if the CPP uses audio compression

When it is a digital cordless phone, the upstream and downstream voice output levels should be at least 35dB lower than the recorded reference level. If CPP does not

With audio compression and expansion, the upstream and downstream voice output levels should be at least 18dB lower than the recorded reference level. For non-speech devices, its

The bit error rate cannot be higher than 1×10-3.

For CFP, the limit of speech level or noise level is shown in Appendix A of GB/T 17618-2015.

After the test, EUT should work normally, there is no loss of user control function or loss of stored data, and the communication connection is maintained.

The EUT should also be tested in idle mode, and the transmitter should not be operated by mistake.

5.3 Performance criterion B of the transmitter

During the test, a communication connection should be established and maintained.

After the test, the EUT should be able to work normally, with no user-perceptible communication quality degradation, no user control function loss or data storage

Lost, and keep the communication connection.

In order to confirm the above-mentioned performance during the call, a test in idle mode should also be carried out, and the transmitter should not be operated by mistake.

5.4 Performance criterion A of the receiver

During the test, a communication connection should be established and maintained.

When CPP is measured by an audio BPF with a CF of 1kHz and a BW of.200Hz, if the CPP uses audio compression and expansion

Or when it is a digital cordless phone, the upstream and downstream voice output levels should be at least 35dB lower than the recorded reference level. If CPP did not adopt

With audio compression and expansion, the upstream and downstream voice output levels should be at least 18dB lower than the recorded reference level. For non-speech devices, the error

The code rate cannot be higher than 1×10-3.

For CFP, the limit of speech level or noise level is shown in Appendix A of GB/T 17618-2015.

After the test, EUT should work normally, there is no loss of user control function or loss of stored data, and the communication connection is maintained.

5.5 Performance criterion B of the receiver

During the test, a communication connection should be established and maintained.

After the test, the EUT should be able to work normally, with no user-perceptible communication quality degradation, no user control function loss or data storage

Lost, and keep the communication connection.

6.1 Harassment measurement

The harassment measurement items are shown in Table 1.

a) The test should be carried out in the entire frequency range of 80MHz~2.7GHz;

b) The test level is 3V/m, and the disturbance source undergoes 80% amplitude modulation through a 1kHz audio signal;

c) In the frequency range of 80MHz~1GHz, the scan step length is not more than 1% of the instantaneous frequency; at the frequency of 1GHz~2.7GHz

Within the range, the scan step length is not greater than 0.5% of the instantaneous frequency;

d) The dwell time of the scan should take into account the response time of the tested equipment and monitoring equipment, and should be recorded in the test report.

If the response of the receiver or the receiver as a part of the transmitter is a narrowband response at discrete frequency points, then this response is ignored.

The test frequency should be recorded in the test report.

8.2.3 Performance criteria

For the transmitter, the performance criterion of 5.2 should be used.

For the receiver, the performance criterion of 5.4 should be used.

8.3 Electric fast transient pulse group immunity test

8.3.1 General requirements

This test item is applicable to fixed and applicable CPP, CFP and its auxiliary equipment.

This test item is also applicable to signal/control ports and DC power input/output ports with a cable exceeding 3m.

The test should be performed on the input port of the AC power source.

The test should be carried out in a typical configuration where the CPP and CFP are connected to their auxiliary equipment.

8.3.2 Test method and grade

The test is carried out according to GB/T 17626.4, but the following requirements must be met.

For transmitters, receivers, transceivers and auxiliary equipment with cables longer than 3m or connected to AC power.

a) The test level of the signal/control port is open circuit voltage 0.5kV;

b) The test level of the DC power port is an open circuit voltage of 1kV;

c) The test level of the AC power port is an open circuit voltage of 2kV.

8.3.3 Performance criteria

For the transmitter, the performance criterion of 5.3 should be used.

For the transmitter, the performance criterion of 5.5 should be used.

8.4 Surge (impact) immunity test

8.4.1 General requirements

This test item is suitable for fixing CPP, CFP and its auxiliary equipment.

The test should be carried out at the input port of the AC power supply, the input port of the DC power supply and the signal port.

The test shall be carried out in a typical configuration where CPP, CFP and its auxiliary equipment are connected.

8.4.2 Test method and grade

The test is carried out in accordance with GB/T 17626.5 and should meet the following requirements.

a) The line to ground is 2kV open circuit voltage;

b) The line-to-line is 1kV open circuit voltage.

8.4.3 Performance criteria

For the transmitter, the performance criterion of 5.3 should be used.

For the receiver, the performance criterion of 5.5 should be used.

8.5 Immunity test of conducted disturbance induced by radio frequency field

8.5.1 General requirements

This test item is suitable for fixing CPP, CFP and its auxiliary equipment.

This test item is suitable for fixed CPP and its auxiliary equipment signal/control port, DC power supply and AC power input/output port

When the connecting cable exceeds 3m.

The test shall be carried out in a typical configuration where CPP, CFP and its auxiliary equipment are connected.

8.5.2 Test method and level

The test method adopts the current clamp injection method in GB/T 17626.6.When it does not cause the performance of the EUT to decrease, the coupling/decoupling can be used

Coupling network or direct injection method for testing.

The test is carried out in accordance with GB/T 17626.6 and should meet the following requirements.

a) The signal is 80% amplitude modulated by 1kHz audio signal;

b) In the frequency range of 150kHz~5MHz, the step length of frequency increase is not more than 50kHz, and in the frequency range of 5MHz~80MHz

The step length of frequency increase is not more than 1% of the instantaneous frequency;

c) The dwell time of the scan should take into account the response time of the tested equipment and monitoring equipment, and should be recorded in the test report;

d) The test level shall be the test level 2 given in GB/T 17626.6.When the transfer impedance is 150ohm, the test level shall be equal to

The square root value is 3V.

If the response of the receiver or the receiver as a part of the transceiver at the discrete frequency point is a narrowband response, then this response is ignored

Excluding.

8.5.3 Performance criteria

For the transmitter, the performance criterion of 5.2 should be used.

For the receiver, the performance criterion of 5.4 should be used.

8.6 Voltage sag and short-term interruption immunity test

8.6.1 General requirements

This test item is suitable for fixed CPP, CFP and auxiliary equipment powered by AC power supply.

The test should be performed at the AC power input port.

The test should be carried out in a typical configuration where the CPP, CFP and its auxiliary equipment are fixed.

8.6.2 Test method and grade

The test is carried out according to GB/T 17626.11.

The test level of voltage sag immunity is.

a) The supply voltage drops to 0% and the duration is 10ms;

b) The supply voltage drops to 0%, and the duration is 20ms;

c) The supply voltage drops to 70% and the duration is 500ms.

The test level of voltage interruption immunity is. the supply voltage drops to 0%, and the duration is 5000ms.

8.6.3 Performance criteria

8.6.3.1

For the voltage drop to 70%, the voltage sag with a duration of 500ms and the voltage drop to 0%, the duration is

For a voltage sag of 10ms, the following performance criteria should be used.

a) For the transmitter, the performance criterion of 5.3 is used.

b) For the receiver, the performance criterion of 5.5 should be used.

8.6.3.2

For the voltage drop to 0%, the voltage sag with a duration of 20ms, and the voltage drop to 0% with a duration of 5000ms

For short-time interruption, the following performance criteria should be used.

a) If the EUT is equipped with a backup battery or is connected to a backup battery, then the performance criterion of 5.3 or 5.5 shall be used correspondingly;

b) If the EUT is only powered by AC power (no backup battery is used), during the test, volatile user data can be lost, and communication

The connection does not need to be maintained, but the communication connection can be re-established aft...