Tescom MTP200B, Operating Manual

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BLE Transmitter Test Items
143
22.1.2 Modulation characteristics(TP/TRM-LE/BV-05-C)
1. Objective: To measure the modulation index to analyze the transmission modulation characteristi
cs of DUT.
2. Test Procedure:
A. The DUT transmits LE test packets with MAX_TX_LENGTH octet packet payload consisting of
a repetitive sequence of 0F hex octets (11110000 bin in transmission order).
B. Set number of test packet to 10 at least.
C. DUT transmits at maximum power.
D. Set the instrument, as in the following table.
E. The measurement shall start at the beginning of the fifth bit of the payload (See Figure 22-5
Frequency deviation measurement principle for 11110000-payload sequence for description).
The last four bits in the payload shall be disregarded. The sequence center frequency; f1ccf is
calculated as the average frequency of all samples over each 00001111 bin sequence. For th
e second, third, sixth and seventh bits in each 00001111bin sequence, the absolute value of
the frequency offset from f1ccf is recorded as Δf1max. Δf1max is defined as the average dev
iation for each individual bit. The average frequency value of all Δf1max frequencies in a pac
ket is calculated and recorded as Δf1avg.
F. The DUT transmits LE test packets with MAX_TX_LENGTH octet payload consisting of a repe
titive sequence of 55hex octets (10101010bin in transmission order).
G. The measurement shall start at the beginning of the fifth bit in the payload field. The last fou
r bits in the payload shall be disregarded. The sequence center frequency; f2ccf is calculated
as the average frequency of all samples over each 10101010bin sequence. The maximum de
viation from the sequence center frequency, f2ccf is recorded as f2max for each individual
bit. See Frequency deviation measurement principle for 10101010-payload sequence for ref
erence. The average frequency value of all f2max frequencies in a packet is calculated and
recorded as Δf2avg.
Parameter DUT MTP200B
TEST_METHOD TEST_MODE
TEST_CASE POW+MOD
CH_NUM 0 ~ 39 Same channel as of DUT
NUM_PACKET 1 ~ 10
Packet Length(octets) 37(255 for BT v4.2 or more)
Test Packet Type(payload type) 11110000(f1)
10101010(f2)