Specifications
ETSI
Final draft ETSI EN 300 328 V1.8.1 (2012
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04)
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5.3.2.2 Test method
5.3.2.2.1 Conducted measurements
In case of conducted measurements the transmitter shall be connected to the measuring equipment by a suitable method.
The RF power as defined in clauses 4.3.1.1 or 4.3.2.1 shall be measured and recorded.
5.3.2.2.1.1 RF Output Power
The test procedure shall be as follows:
Step 1:
• Use a fast power sensor suitable for 2,4 GHz and capable of 1 MS/s.
• Use the following settings:
- Sample speed 1 MS/s or faster.
- The samples must represent the power of the signal.
- Measurement duration: For non-adaptive equipment: equal to the observation period defined in
clauses 4.3.1.2.1 or 4.3.2.3.1. For adaptive equipment, the measurement duration shall be long enough to
ensure a minimum number of bursts (at least 10) are captured.
NOTE 1: For adaptive equipment, to increase the measurement accuracy, a higher number of bursts may be used.
Step 2:
• For conducted measurements on devices with one transmit chain:
- Connect the power sensor to the transmit port, sample the transmit signal and store the raw data.Use
these stored samples in all following steps.
• For conducted measurements on devices with multiple transmit chains:
- Connect one power sensor to each transmit port for a synchronous measurement on all transmit ports.
- Trigger the power sensors so that they start sampling at the same time. Make sure the time difference
between the samples of all sensors is less than half the time between two samples.
- For each instant in time, sum the power of the individual samples of all ports and store them. Use these
stored samples in all following steps.
Step 3:
• Find the start and stop times of each burst in the stored measurement samples.
NOTE 2: The start and stop times are defined as the points where the power is at least 20 dB below the RMS burst
power calculated in step 4.
Step 4:
• Between the start and stop times of each individual burst calculate the RMS power over the burst. Save these
Pburst values, as well as the start and stop times for each burst.
Step 5:
• The highest of all Pburst values (value "A" in dBm) will be used for maximum e.i.r.p. calculations.
Step 6:
• Add the (stated) antenna assembly gain "G" in dBi of the individual antenna.
• If applicable, add the additional beamforming gain "Y" in dB.