Tescom MTP200B, Operating Manual

Page: 163 / 172

BLE Transmitter Test Items
147
22.1.3 Carrier frequency offset and drift(TP/TRM-LE/BV-06-C)
1. Objective: To measure the frequency accuracy of the initial transmission signal and the center fre
quency stability within a packet
2. Test Procedure:
A. The DUT transmits LE test packets with MAX_TX_LENGTH octet payload consisting of a repe
titive sequence of 55 hex octets (10101010 bin in transmission order) in the payload.
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 is to be performed at the start of the preamble field in the transmitted pa
cket. The tester integrates the frequency of the FM demodulated signal from the center of th
e first preamble bit to the center of the first bit following the 8th preamble bit, 8 bits in total.
See Initial frequency offset (f0 ) measurement principle for reference.
F. The integral sum in E is considered to be the initial carrier frequency of the DUT, and is recor
ded as f0.
G. Throughout the payload of the packet, the tester integrates the frequency of the FM demod
ulated signal in 10-bit intervals, starting at the second bit in the payload. The measurement i
s repeated until the end of the payload duration. The last 10-bit sequence should not overla
p the CRC-field at the end of the packet. See Frequency drift measurement principle for refer
ence.
H. The integral sums are recorded as fn, where n is an integer from 1 to k. fk represents the last
integral sum before the start of the CRC field in the packet.
Parameter DUT MTP200B
TEST_METHOD TEST_MODE
TEST_CASE POW+Fc_O/D
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) 10101010
Figure 22-7 POW+Fc_O/D Test Setting Screen