System for simple test of the Radio Law and IEEE utilizing a real time spectrum analyzer
Application
RF transmission characteristic test of equipment with built-in antenna, which is regulated in the technical standard conformity certification and IEEE, can be easily measured combining real time spectrum analyzer MSA500 series and anechoic box. By limiting specifications or applications, it is possible to construct an inexpensive system.
The physical layer test of ZigBee is regulated in the technical standard conformity certification and IEEE802.15.4-2003.
Solution
Test contents of the technical standard conformity certification (reference)
- Frequency deviation
- Occupied and spread bandwidth
- Spurious radiation strength
- Transmission power
- Limit on secondary radiated emission
- Angular width of main radiation of antenna
- Interference prevention function
Test contents of IEEE (reference)
- Spectrum mask test
- EVM(Error vector magnitude)
- Carrier frequency error
- Spurious radiation strength
- Transmission power
Note. * MSA500 series doesn’t have the modulation analysis function.
Connection example
Example of Ch15 (2480MHz)
In the measurement of “spurious radiation strength” and “limit on secondary radiated emission”, a spectrum analyzer with 12.5GHz or more bandwidth is required. However, MSA500 series is utilizable if limited by third harmonic (7.4 GHz).
*Measuring frequency range of MSA558:20kHz to 8.5GHz
“EVM” and “frequency carrier error” can’t be measured since the modulation analysis function isn’t installed. However, it is possible to observe the raw constellation waveform of Offset-QPSK modulation.
Example of “Occupied bandwidth” required by the Radio Law
Example of “Spread bandwidth” required by the Radio Law
System configuration
Handheld signal analyzer MSA558 |
Electromagnetic anechoic box / MY1530 + I/F module |
Others, Antenna, cables and adapter |
Products introduction
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