User Manual Q&AAnswer
Oct 21, 2025 - 04:08 PM
To optimize the performance of the TEKBOX TBMA3 Log Periodic Measurement Antenna for radiated noise EMC pre-compliance testing within the frequency range of 250 MHz to 1300 MHz, follow these guidelines based on the owner's manual:
1. **Antenna Factor Adjustment:** Add the antenna factor to the measurement result to convert the level in dBm to an equivalent electrical field strength in dBmV/m. This conversion will also impact the base noise level of the spectrum analyzer, reducing the margin between base noise and limit lines.
2. **Spectrum Analyzer Settings:** If there is no risk of overloading the spectrum analyzer RF-input, decrease the internal attenuation to 0 dB and activate the pre-amplifier to optimize the dynamic range of the measurement. Use a low-loss coaxial cable to connect the antenna to the spectrum analyzer.
3. **Resolution Bandwidth (RBW):** CISPR 16 specifies a resolution bandwidth of 120 KHz for frequency ranges between 300 MHz and 1 GHz. Lowering the RBW cannot be used to reduce the base noise level. However, for standards with challenging limits regarding base noise levels of precompliance spectrum analyzers, consider moving the antenna closer to the Device Under Test (DUT) and adjusting the limits accordingly to increase the margin between base noise and limit levels.
4. **Distance Conversion:** Use the provided table in the manual to convert measurement limits from 3m to 1m or from 10m to 1m distances. This conversion can provide additional margin to the base noise level, especially for measurements above 250 MHz where the antenna is already in the far field for any frequency.
By following these guidelines and considering the recommendations in the manual, you can optimize the performance of the TBMA3 antenna for radiated noise EMC pre-compliance testing in the specified frequency range.
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