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Frequently Asked Questions

What is the recommended capture length to get reliable WLAN Error Vector Magnitude results in a production environment?

Capturing and analyzing an entire packet is generally not necessary to get accurate and stable EVM measurement. In a production environment that can take an excessive amount of time.

As a starting point, the capture length can be derived as follows:

  • For OFDM packets: The minimum capture length = pre trigger time (10 us) + OFDM preamble length (20us)+ OFDM symbol length (4us)* number of OFDM symbols (at least 16)
  • For DSSS/CCK: The minimum capture length = pre trigger time (10us) + preamble length (192us for long preamble and 96us for short preamble) + number of chips (at least 1000)/data rate