Troubleshooting Bluetooth Measurements

This topic lists common problems when making Bluetooth Demod and Bluetooth Spectrum measurements, and how to resolve them.

No burst is found

If Burst Search Mode is Access-Address Correlation, verify that the Access Address matches the signal. For LE Data packets the connection's access address must be entered manually; if it is unknown, switch to Amplitude Threshold mode.
Verify that the Search Length is long enough to contain a complete burst, including idle time between bursts.
Verify that the Bluetooth Mode PHY Rate and Packet Type match the transmitted signal — a mismatched PHY Physical Layer prevents access-address correlation from locking.

The measurement is tuned to the wrong frequency

The measurement center frequency does not automatically follow the Bluetooth Mode Channel Index. After changing the channel, click the -> Measurement Center button in the Bluetooth Mode section to retune the measurement to the channel center.

Modulation-characteristics results are missing or unexpected

Δf1 and Δf2 require specific test payloads (11110000 and 10101010 respectively). Verify that the device under test transmits the pattern selected by the Payload Pattern parameter, or set the pattern to Auto. Check the Demod Bits trace to see what was actually received.

BR or EDR signals do not demodulate

This release supports Bluetooth low energy (LE) signals only.