The measurements for Nominal Center
Frequencies are performed at both normal environmental conditions and at the extremes of
the operating temperature range declared by the manufacturer. The test results comply
with the limits shown in the Limits on Center Frequency table in CE
Regulations for SRDs Operating in License-Free 2.4 GHz/5 GHz Bands
[1] and are recorded in the test report. The test procedure for Nominal
Center Frequencies measurement is described in the following steps:
- Connect the EUT as shown in Figure 2-1.
- Spectrum Analyzer or Frequency
Counter can be used as test equipment.
- For detailed test procedure, see
clause 5.4.2.2.1.1 of EN 301 893 [4].
- Switch ON the EUT and other test
equipment.
- Setup the test equipment to the
desired settings. If the Spectrum Analyzer is used for this test, then set the
Spectrum Analyzer to the following settings:
- Center Frequency: The center
frequency of the channel under test
- Reference Level: 30 dBm
- Frequency Span: 10 KHz
- Other parameters: Auto
- Use the Radio Testing Tool [9] to setup and configure the EUT. For setting and up configuring
the EUT, see the Radio Testing Tool User's Guide [10].
- Open the Radio Testing Tool [9] and setup the link with the EUT by using the Setup tab.
- Open the Tx tab and set the
transmission mode to “Carrier Wave (CW)”.
- Configure the EUT to the desired
Channel/Frequency, Tx power and Tone to 0 setting.
- Click on “ Start Tx Testing”.
- Observe the Tx signal on the Spectrum
Analyzer, measure the Tx signal (Carrier) frequency by using Marker Peak function
and record the value.
- Repeat the above for other desired
channels and also repeat the test at extreme temperature conditions.
- The measured Nominal Center
Frequencies comply with the limits shown in the Limits on Center Frequency
table in CE Regulations for SRDs Operating in License-Free 2.4 GHz/5
GHz Bands [1] for all the above test cases.