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)

  1. Frequency deviation
  2. Occupied and spread bandwidth
  3. Spurious radiation strength
  4. Transmission power
  5. Limit on secondary radiated emission
  6. Angular width of main radiation of antenna
  7. Interference prevention function

Test contents of IEEE (reference)

  1. Spectrum mask test
  2. EVM(Error vector magnitude)
  3. Carrier frequency error
  4. Spurious radiation strength
  5. Transmission power

Note. * MSA500 series doesn’t have the modulation analysis function.

Connection example

Figure:Connection example

Example of Ch15 (2480MHz)

Photo:Reference example of CH15 (2480 MHz) Part1

Photo:Reference example of CH15 (2480 MHz) Part2

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

Photo:Reference example of CH15 (2480 MHz) Part3

“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.

Photo:Reference example of CH15 (2480 MHz) Part4

Example of “Occupied bandwidth” required by the Radio Law

Photo:Reference example of CH15 (2480 MHz) Part5

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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