Simple test of the Radio Law and IEEE on ZigBee module

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.