Anritsu MT8850A, Руководство по эксплуатации, Страница: 80 / 156

MT8850A / MT8852A Bluetooth Test Set Using the Script Menu
8-20 13000-000109
Testing in Standard Script Mode January 2003
Carrier Drift Test (Standard Mode)
The carrier drift test performs a frequency drift measurement over the length of the packet
received. The test can be carried out for each of the supported packet types with either
hopping on or hopping off. This test can be performed using either the loopback test
control or the TX test control. The default is to use the loopback test control.
In loopback mode with hopping off, the MT8850A/MT8852A sends DH1, DH3 and DH5
packets with a 10101010.... payload at each of the frequencies selected (LOW, MEDIUM
and HIGH). The EUT returns the DH1, DH3 or DH5 packet for measurement. The LOW,
MEDIUM and HIGH frequencies relate to the default frequencies specified in the Bluetooth
RF test specification. The number of packets of each length that are measured is set in
the “Number of packets” field. The MT8850A/MT8852A allows all the frequencies to be
changed. This is the test method described in the Bluetooth RF Test Specification for a
carrier frequency drift test with hopping off.
In loopback mode with hopping on, and hopping on mode set to “All” the
MT8850A/MT8852A sends DH1, DH3 and DH5 packets with a 10101010 payload. The
EUT returns the DH1, DH3 or DH5 packet for measurement. The MT8850A/MT8852A will
measure the carrier frequency drift for each packet length at every one of the 79
frequencies in the Bluetooth channel structure. The number of packets of each length that
are measured is set in the “Number of packets” field. This is the test method described in
the Bluetooth RF Test Specification for a carrier frequency drift test with hopping on.
In loopback mode with hopping on, and hopping on mode set to “Any” the
MT8850A/MT8852A sends DH1, DH3 and DH5 packets with a 10101010 payload. The
EUT returns the DH1, DH3 or DH5 packet for measurement. The MT8850A/MT8852A will
measure the carrier frequency drift at the next frequency that the link hops to after the
previous carrier frequency drift measurement has been completed. The number of packets
of each length that are measured is set in the “Number of packets” field.
In TX mode with hopping on or off the measurement process is the same as for loopback
except that the MT8850A/MT8852A does not send full DHX packets but just POLL
packets. The EUT has been configured by the MT8850A/MT8852A to respond to a POLL
with the appropriate DHX packet. The EUT must support TX mode part of the Test Mode
specification for this to work. The test time is much shorter when run using TX mode
compared with loopback, as the MT8850A/MT8852A does not have to send full packet
lengths. When the test is performed in TX test mode, EUT transmitter and receiver
frequencies must be the same. TX mode complies with the Bluetooth RF Test
Specification for a carrier frequency drift test.