Running a Script in Standard Mode Low Energy Tests
MT8852B Operation Manual PN: 13000-00205 Rev. N 7-47
Modulation Characteristics Test
This test measures the modulation characteristics on the EUT output for each of the selected
frequency ranges (LOW, MEDIUM and HIGH).
Bluetooth 5 introduces the concept of Stable Modulation Index. A transmitter meeting the
stable modulation index standard has a modulation index between 0.495 and 0.505. A device
that does not meet this requirement, but otherwise conforms to the low energy test
specification is said to have a standard modulation index. The MT8852B now has a test mode
setting which allows the choice of testing against either the standard or stable limits, or both.
For modulation tests on BLE and 2LE packet types the MT8852B transmits a test control
message over the RS232, USB, 2-Wire or USB-Adapter interface instructing the EUT to
transmit reference test packets with a four ones four zeros payload (11110000). For BLR8
packets, the EUT is instructed to transmit a bit stream which, when encoded by the forward
error correction function and the pattern mapper, produces a payload with a similar
repeating four ones, four zeros pattern. Modulation characteristics tests are not required for
BLR2 packets.
The MT8852B calculates the average frequency of each 11110000 payload section. It
measures the deviation from the average frequency for bits 2, 3, 6, and 7. These values are
called Δf1 max values.
Figure 7-65. Low Energy Modulation Index Test (11110000)
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