The Bluetooth transmission device operates in the 2.4GHz ISM (Industrial, Scientific, Medical) band, and this specification establishes a dedicated operating frequency range for Bluetooth transmission equipment.

Accordingly, the Bluetooth system must meet the following two necessary conditions:

● between the radio equipment in the Bluetooth system must be compatible;

● System capacity should be determined;

The same time as

The Bluetooth transmission equipment shall comply with the operating conditions of the complete operating specification. The parameters of the radio receiving and receiving equipment shall be tested in accordance with the method described in the RF test standard. At present the world is mainly used in BLUETOOTH SPECIFICATION Version 2.1 + EDR this standard, of course, the relevant test standards with the development of Bluetooth technology has been constantly modified and improved.

Bluetooth EDR is the Bluetooth abbreviation of the English abbreviation, which features greatly improved the Bluetooth data transfer rate, reached 2.1Mbps, is the current three times the Bluetooth technology. So you can take advantage of the bandwidth advantage to connect multiple Bluetooth devices in addition to the lower power consumption for more stable audio streaming. At present more and more Bluetooth devices have begun to support Bluetooth EDR technology.

Where the EDR test points are: Transmitter Test (TRM); Receiver Test (TRV).

EDR transmitter test items included

EDR receiver test items included

EDR Relative Transmit Power

EDR Sensitivity

EDR Carrier Frequency Stability and Modulation Accuracy

EDR BER Floor Performance

EDR Differential Phase Encoding

EDR C / I Performance

EDR In-band Spurious Emissions

EDR Maximum Input Level

The following is a description of the Bluetooth test items:

EDR Relative Transmit Power

Test Intent: This test is to ensure that the data is within an acceptable range at different average transmit powers in the FM [GFSK] and phase modulation [DPSK] sections.

Test Methods:

1) Connect the EUT to a test system via a 50Ω connector or a 50Ω external antenna.

2) into the EUT test mode (loop mode or launch mode), turn off the whitening.

3) Turn off hopping when the system enters the test environment.

4) If the EUT supports power control, then use the LMP command to control the maximum power of the EUT.